Landmark Moments in Medicine

1796 · Infectious Disease

Jenner's smallpox vaccination (cowpox inoculation)

Jenner used cowpox to protect a boy from smallpox in 1796, then documented his cases in 1798. It was the first deliberate vaccine and the method that eventually drove smallpox to eradication in 1980.

Jenner E. An Inquiry into the Causes and Effects of the Variolae Vaccinae. London, 1798. · NIH

1846 · Surgery & Anesthesia

The Ether Demonstration ("Ether Day")

First public proof that inhaled ether let a patient sleep through surgery without pain. Within months the technique spread across Europe and the United States, ending the era when speed was the surgeon's only mercy.

Boston Medical and Surgical Journal, 1846 · PubMed

1847 · Public Health

Hand washing prevents childbed fever (Ignaz Semmelweis)

Semmelweis found that having doctors clean their hands in a chlorine solution before deliveries cut deaths from puerperal fever on the maternity ward from about 18 percent to near 2 percent. The finding came decades before germ theory explained why.

Vienna General Hospital, 1847 · PubMed

1854 · Public Health

John Snow and the Broad Street Pump

Snow's 1854 Soho investigation tied cholera deaths to a single Broad Street pump and showed disease could spread through water, decades before the cholera bacterium was identified. It set the template for field outbreak investigation.

Cameron D, Jones IG. Int J Epidemiol. 1983 (analysis of Snow's 1854 investigation) · PubMed

1861 · Foundational Discovery

Pasteur's refutation of spontaneous generation

Pasteur boiled broth in swan-neck flasks: it stayed sterile while open to air but spoiled once airborne dust reached it. Microbes come from microbes, the result that anchored sterilization, antisepsis, and germ theory.

Ann Sci Nat (Zoologie), 1861 · NIH

1867 · Surgery & Anesthesia

Lister's antiseptic surgery

Lister dressed wounds with carbolic acid to kill the microbes Pasteur had described. At his Glasgow infirmary amputation mortality fell from about 46 to 15 percent, putting germ theory to work in the operating room.

Lancet, 1867 · PubMed

1882 · Infectious Disease

Koch's Discovery of the Tubercle Bacillus

Koch identified the tubercle bacillus as the cause of tuberculosis, then the leading killer in Europe, using a new staining method and pure cultures. The work set the experimental standard for tying a microbe to a disease.

Berliner Klinische Wochenschrift, 1882 · CDC

1895 · Foundational Discovery

Roentgen's discovery of X-rays

Roentgen found a radiation that passed through soft tissue but not bone, letting physicians see inside a living patient without cutting. The work won the first Nobel Prize in Physics in 1901 and started diagnostic radiology.

Sitzungsber Phys-Med Ges Wurzburg, 1895 · NIH

1901 · Foundational Discovery

Discovery of the ABO Blood Groups

Landsteiner mixed sera and red cells from his colleagues and found people fall into reactive groups he first called A, B, and C. Matching donor to recipient by group turned transfusion from a gamble into routine practice.

Wiener klinische Wochenschrift, 1901 · PubMed

1912 · Foundational Discovery

Funk's vitamine (vital amine) hypothesis

Funk named these dietary factors "vitamines" and argued each missing one produced a distinct disease. The idea organized scattered observations into the concept of deficiency diseases and directed work toward isolating individual vitamins.

J State Med. 1912;20:341-368 · PubMed

1916 · Critical & Organ Care

Rous and Turner's citrate-glucose method for storing red blood cells

Citrate plus dextrose kept donor red cells viable for weeks, so blood could be collected ahead of need instead of run vein to vein. This made stored blood and later blood banks workable.

Journal of Experimental Medicine, 1916 · PubMed

1922 · Endocrinology

Discovery of Insulin

Before insulin, type 1 diabetes killed within months of diagnosis. Banting and Best's pancreatic extract turned it into a treatable condition; the work won the 1923 Nobel Prize for Banting and Macleod.

Banting FG, Best CH. J Lab Clin Med. 1922 · PubMed

1922 · Endocrinology

Insulin for diabetes mellitus

First effective treatment for type 1 diabetes, until then fatal within months. Within a year a commercial insulin product was available, turning a death sentence into a survivable chronic disease.

Can Med Assoc J, 1922 · NIH

1928 · Infectious Disease

Fleming's discovery of penicillin

Fleming noticed mold-contaminated plates clearing staphylococci and traced it to a filterable substance he called penicillin. The finding sat largely unused until Florey and Chain purified it for clinical use in the 1940s.

Br J Exp Pathol, 1929 · NIH

1932 · Foundational Discovery

Identification of vitamin C as the antiscorbutic factor

Two groups in 1932 tied scurvy, known since antiquity, to a single chemical deficiency, fixing the antiscorbutic factor as ascorbic acid. Szent-Gyorgyi won the 1937 Nobel; he and King disputed priority for years.

Science, 1932 (King & Waugh); J Biol Chem, 1932 (Waugh & King) · PubMed

1937 · Critical & Organ Care

First clinical use of heparin as an injectable anticoagulant

A purified, standardized heparin from Best's Toronto lab let Gordon Murray use it in patients in 1937, making safe anticoagulation possible and later enabling dialysis, cardiac bypass, and treatment of venous thrombosis.

Murray, Jaques, Perrett, Best. Surgery, 1937 · PubMed

1943 · Critical & Organ Care

Kolff's rotating drum artificial kidney

Kolff's rotating drum dialyzer was the first machine to clear blood toxins well enough to pull a patient through acute renal failure, first succeeding in 1945. It made dialysis a usable treatment rather than a lab experiment.

Acta Medica Scandinavica, 1944 · PubMed

1944 · Surgery & Anesthesia

The Blalock-Taussig Shunt (first "blue baby" operation)

First successful surgery for congenital heart disease. By rerouting a subclavian artery to the lungs, it relieved cyanosis in tetralogy of Fallot infants and showed the great vessels near the heart could be operated on.

JAMA. 1945;128:189-202. · PubMed

1947 · Research Methods & Ethics

The Nuremberg Code

Written by American judges in the 1947 verdict against Nazi doctors, it was the first international standard for human research and made voluntary consent the opening rule, ranking the subject's welfare above scientific interest.

Trials of War Criminals before the Nuremberg Military Tribunals, 1949 (Code issued 1947) · NIH

1948 · Oncology

Aminopterin-induced remissions in childhood acute leukemia

Farber gave aminopterin to 16 children with acute leukemia and saw 10 enter temporary remission, the first clear evidence that a drug could push a human cancer into retreat. It opened cancer chemotherapy.

N Engl J Med 1948;238:787-793 · PubMed

1948 · Research Methods & Ethics

MRC Streptomycin Trial for Pulmonary Tuberculosis (Medical Research Council Streptomycin Treatment of Pulmonary Tuberculosis Trial)

Bradford Hill used concealed allocation from random number tables to assign 107 TB patients to streptomycin plus bed rest or bed rest alone. The drug group had lower mortality, setting the design standard for clinical trials.

BMJ. 1948;2(4582):769-782 · PubMed

1949 · Neurology & Psychiatry

Cade's lithium for mania

Cade treated 10 manic patients with lithium and saw clear remission, the first drug to control a major mental illness. It launched psychopharmacology, and lithium remains a first-line mood stabilizer that lowers suicide risk in bipolar disorder.

Med J Aust. 1949 · PubMed

1950 · Public Health

Doll and Hill smoking and lung cancer case-control study

Doll and Hill compared lung cancer patients with matched hospital controls and found heavy smokers carried far higher risk. The case-control method they used became a standard tool for studying chronic disease causation.

BMJ, 1950 · PubMed

1952 · Neurology & Psychiatry

Chlorpromazine in psychosis (Delay & Deniker)

In 1952 Delay and Deniker gave psychotic patients chlorpromazine and saw agitation and delusions ease without heavy sedation. It became the first drug to treat schizophrenia directly and started modern psychopharmacology.

Delay J, Deniker P, Harl JM. Ann Med Psychol (Paris). 1952;110(2):112-117. · PubMed

1953 · Reproductive Health

Apgar Score for newborn assessment

Apgar, an obstetric anesthesiologist, scored five signs at one minute after birth on a 0-10 scale. It gave delivery rooms a fast, repeatable read on which newborns needed resuscitation and remains in routine use.

Current Researches in Anesthesia and Analgesia, 1953 · PubMed

1953 · Cardiology

First Successful Open-Heart Surgery Using the Heart-Lung Machine

On May 6, 1953, Gibbon's heart-lung machine ran an 18-year-old's circulation for 45 minutes while he closed an atrial septal defect, the first cardiac repair done inside a still, open heart under direct vision.

Minnesota Medicine, 1954 · PubMed

1953 · Genetics & Molecular

Molecular Structure of Nucleic Acids: The DNA Double Helix

The two-strand, A-T and G-C base-paired model explained how DNA stores genetic information and copies itself, since each strand serves as a template for the other. It started molecular genetics.

Nature, 1953 · PubMed

1954 · Public Health

British Doctors Study (Doll and Hill prospective cohort)

Doll and Hill began following 40,000 British doctors in 1951; the 1954 report tied lung cancer death to smoking dose. Over 50 years of follow-up smokers lost about a decade of life.

BMJ, 1954 · PubMed

1954 · Surgery & Anesthesia

First Successful Kidney Transplant

The first human organ transplant with lasting graft function. Using identical twins sidestepped rejection and showed transplantation could work, opening the clinical field. Murray shared the 1990 Nobel Prize.

Surg Forum. 1955;6:432-436 · PubMed

1954 · Cardiology

Warfarin introduced for clinical anticoagulation

Warfarin reached the clinic in 1954 as the first practical oral anticoagulant. It remained the main drug for atrial fibrillation and venous thromboembolism for about five decades, until factor Xa and thrombin inhibitors replaced it after 2010.

J Saudi Heart Assoc, 2016 (history review) · PubMed

1955 · Infectious Disease

Salk Inactivated Polio Vaccine Field Trial (Francis Report) (An Evaluation of the 1954 Poliomyelitis Vaccine Trials)

Announced April 12, 1955 after a placebo-controlled trial in 1.8 million children, it confirmed the killed-virus Salk vaccine prevented paralytic polio and triggered national licensure and mass immunization within days.

Am J Public Health Nations Health. 1955;45(5 Pt 2):1-63 · PubMed

1955 · Foundational Discovery

Sanger's Sequencing of Insulin

Sanger read out insulin's two chains and the disulphide bonds joining them, the first full sequence of any protein. It showed each protein has one defined order of amino acids and won him the 1958 Nobel Prize in Chemistry.

Biochemical Journal, 1955 · PubMed

1956 · Public Health

Water Fluoridation (Grand Rapids study, 10-year results)

First population-level evidence that fluoridating drinking water cut childhood tooth decay, with reductions near 60 percent in children born after 1945. The data drove adoption of community fluoridation across the United States.

Public Health Reports, 1956 · PubMed

1958 · Reproductive Health

Diagnostic medical ultrasound for obstetrics and abdominal masses (Donald)

Donald, MacVicar, and Brown showed pulsed ultrasound could tell solid from cystic abdominal masses and image the fetus, giving obstetrics a diagnostic tool that used no ionizing radiation.

Lancet, 1958 · PubMed

1958 · Cardiology

First implantation of a permanent cardiac pacemaker (Senning and Elmqvist)

Surgeon Ake Senning implanted engineer Rune Elmqvist's transistor pacemaker in Arne Larsson on 8 October 1958 at Karolinska. The first unit failed within hours, but it showed that bradycardia could be treated with a device inside the body.

Netherlands Heart Journal, 2008 (historical review) · PubMed

1958 · Neurology & Psychiatry

Imipramine, the first tricyclic antidepressant (Kuhn)

Imipramine, tested by Kuhn on depressed patients, was the first tricyclic antidepressant and the first drug shown to lift mood directly, which anchored the monoamine theory of depression and the antidepressant classes that followed.

Am J Psychiatry, 1958 · PubMed

1960 · Reproductive Health

Enovid: First FDA-Approved Oral Contraceptive Pill

In 1960 the FDA cleared Searle's Enovid for contraception, the first oral contraceptive. Built on Pincus, Rock, and Garcia's trials, it gave women a reversible, self-administered way to prevent pregnancy.

FDA approval of Enovid for contraceptive use, 1960 · NIH

1960 · Endocrinology

Radioimmunoassay (RIA)

Yalow and Berson used antibody binding and radioactive tracers to measure plasma insulin at picogram levels, far below earlier methods. The technique extended to most hormones and won Yalow the 1977 Nobel Prize.

J Clin Invest. 1960;39:1157-1175. · PubMed

1960 · Infectious Disease

Sabin Oral Live-Attenuated Polio Vaccine (Oral Poliovirus Vaccine (OPV))

Sabin's live oral vaccine produced gut immunity that blocked person-to-person spread, was cheap and needed no needle, and became the main tool the WHO used to push wild poliovirus close to extinction.

JAMA. 1960;173:1521-1526 · PubMed

1960 · Critical & Organ Care

Scribner shunt and long-term hemodialysis

The shunt let clinicians enter the bloodstream repeatedly without sacrificing a vessel each session, turning dialysis into ongoing maintenance therapy. It forced Seattle to create the first committee deciding who would receive treatment.

Trans Am Soc Artif Intern Organs, 1960 · PubMed

1961 · Cardiology

Factors of Risk in the Development of Coronary Heart Disease (Framingham Heart Study) (Framingham Heart Study: Factors of Risk in the Development of Coronary Heart Disease, Six-Year Follow-up Experience)

Six-year follow-up of the Framingham cohort linked high blood pressure, high cholesterol, and smoking to coronary disease and introduced the term "risk factor," giving preventive cardiology its working vocabulary.

Ann Intern Med. 1961;55:33-50. · PubMed

1961 · Public Health

Framingham Heart Study: the "risk factor" concept

Six-year Framingham follow-up tied high blood pressure and cholesterol to coronary disease and named them "risk factors," giving preventive medicine a way to identify high-risk people before symptoms appeared.

Ann Intern Med. 1961 · PubMed

1962 · Research Methods & Ethics

Kefauver-Harris Drug Amendments (Drug Amendments of 1962 (Kefauver-Harris Amendments to the Federal Food, Drug, and Cosmetic Act))

The 1962 amendments made proof of efficacy from adequate and well-controlled studies a legal condition for U.S. drug approval and required informed consent from research subjects, setting the basis for controlled clinical trials.

Public Law 87-781, U.S. Congress, 1962 · NIH

1964 · Research Methods & Ethics

Declaration of Helsinki

Adopted by the World Medical Association in June 1964, it set physician-led rules for human research: informed consent, ethics review, and weighing risk against benefit. Most national research laws and IRB systems trace back to it.

World Medical Association, 1964 · PubMed

1964 · Public Health

Surgeon General's Report on Smoking and Health (Smoking and Health: Report of the Advisory Committee to the Surgeon General of the Public Health Service)

Released January 11, 1964, this was the first U.S. government report to name smoking as a cause of lung cancer. It estimated a 9-to-10-fold cancer risk in smokers and set off the federal warning labels and ad bans that followed.

Smoking and Health: Report of the Advisory Committee to the Surgeon General. PHS Publication No. 1103, 1964 · NIH

1965 · Infectious Disease

Discovery of the hepatitis B virus (Australia antigen)

Blumberg's antigen turned out to be the hepatitis B surface protein. It made donor-blood screening possible and led to the first HBV vaccine. He shared the 1976 Nobel Prize for the work.

JAMA, 1965 · PubMed

1965 · Neurology & Psychiatry

Methadone maintenance treatment for heroin addiction (Dole and Nyswander)

Vincent Dole and Marie Nyswander stabilized 22 heroin-addicted patients on daily oral methadone, showing dependence could be managed as a chronic medical condition. The trial launched opioid agonist therapy.

JAMA, 1965 · PubMed

1966 · Surgery & Anesthesia

National Halothane Study

Prompted by case reports of liver death after halothane, this review of about 856,000 anesthetics found massive hepatic necrosis rare and mostly explained by other causes, and set a model for tracking anesthesia outcomes across hospitals.

JAMA, 1966 · PubMed

1967 · Surgery & Anesthesia

First Human Heart Transplant

Barnard showed in 1967 that a diseased human heart could be removed and replaced. Washkansky lived 18 days, dying of pneumonia while immunosuppressed, which set the field's central problem: controlling rejection without killing the patient.

S Afr Med J. 1967;41(48):1271-1274. · PubMed

1967 · Neurology & Psychiatry

L-DOPA for Parkinson disease (Cotzias)

Cotzias gave 16 patients high oral doses of DL-DOPA and saw marked, lasting reduction in rigidity and tremor, confirming that replacing brain dopamine treats Parkinson disease. It made levodopa standard therapy.

N Engl J Med. 1967 · PubMed

1968 · Surgery & Anesthesia

Coronary Artery Bypass Grafting (CABG)

Favaloro turned coronary bypass into a reproducible operation with operative mortality under 5% by 1970. It became one of the most performed surgeries worldwide and relieved angina in advanced coronary disease.

Ann Thorac Surg. 1968;5(4):334-339. · PubMed

1968 · Critical & Organ Care

Harvard Criteria for Brain Death (A Definition of Irreversible Coma: Report of the Ad Hoc Committee of the Harvard Medical School to Examine the Definition of Brain Death)

The first formal clinical criteria for death by neurological function. It gave physicians a way to declare death in patients on ventilators and set the basis for later brain-death law and organ procurement.

JAMA. 1968;205(6):337-340. · PubMed

1968 · Public Health

Oral Rehydration Therapy for cholera and diarrheal disease (ORT (Oral Rehydration Therapy))

Nalin and Cash showed an oral glucose-salt drink cut intravenous fluid needs by about 80 percent in cholera patients, since glucose pulls sodium and water across the gut. The cheap therapy now treats diarrheal dehydration worldwide.

Lancet, 1968 · PubMed

1968 · Reproductive Health

Rh Immune Globulin (Anti-D / RhoGAM) for Prevention of Rh Hemolytic Disease (Rho(D) Immune Globulin)

Freda, Gorman, and Pollack showed in 1964 that anti-D given to Rh-negative mothers blocks sensitization; RhoGAM was US-licensed in 1968 and turned a common cause of fetal and neonatal death into a preventable one.

Transfusion, 1964 · PubMed

1970 · Oncology

MOPP combination chemotherapy for Hodgkin's disease (Mechlorethamine, Oncovin (vincristine), Procarbazine, Prednisone)

First proof that cycling several cytotoxic drugs at full doses could cure a widespread human cancer. The NCI series reached an 81% complete remission rate with about half of patients alive and disease-free at 10 years.

Ann Intern Med 1970;73(6):881-895 · PubMed

1971 · Reproductive Health

Diethylstilbestrol (DES) and Vaginal Clear-Cell Adenocarcinoma

Herbst tied eight cases of vaginal clear-cell adenocarcinoma in young women to their mothers' use of DES in pregnancy, the first proof a drug taken in utero could cause cancer years later and the basis for ending DES use in pregnancy.

N Engl J Med, 1971 · PubMed

1971 · Foundational Discovery

First clinical CT scanner (EMI head scanner) (CT (computed tomography))

First CT scan of a patient, a woman with a suspected brain tumor, was done in 1971 at London's Atkinson Morley's Hospital. Hounsfield's machine reconstructed cross-sectional X-ray images; he and Cormack shared the 1979 Nobel.

Br J Radiol, 1973 · PubMed

1971 · Oncology

Health Insurance Plan (HIP) of Greater New York mammography trial (Health Insurance Plan of Greater New York)

First randomized trial of breast screening. About 62,000 women aged 40 to 64 were assigned to annual mammography plus clinical exam or usual care; the screened group had roughly 30% fewer breast cancer deaths, mostly in those over 50.

JAMA 1971;215:1777-1785 · PubMed

1971 · Critical & Organ Care

Naloxone approved as an opioid overdose antidote (naloxone hydrochloride (Narcan))

FDA approved injectable naloxone in 1971 as the first specific opioid-overdose reversal agent. It became standard in ambulances and ERs, then moved into community take-home programs as overdose deaths climbed.

Subst Abuse Treat Prev Policy, 2021 · PubMed

1971 · Endocrinology

Schally and Guillemin: Hypothalamic Releasing Hormones (Gonadotropin-Releasing Hormone (GnRH/LHRH); Thyrotropin-Releasing Hormone (TRH))

Schally's group identified GnRH as a single decapeptide driving both LH and FSH release, proving the hypothalamus governs the pituitary by chemical signals. The work seeded GnRH agonists and antagonists used in fertility and cancer care.

Science. 1971;173(4001):1036-1038. · PubMed

1972 · Reproductive Health

Antenatal corticosteroids for fetal lung maturation (Liggins and Howie trial)

In 282 mothers facing preterm delivery, betamethasone cut respiratory distress syndrome from 25.8% to 9.0% and early neonatal death from 15.0% to 3.2%, and a single course became standard care for threatened preterm birth.

Pediatrics, 1972 · PubMed

1972 · Research Methods & Ethics

Cochrane, 'Effectiveness and Efficiency' (Effectiveness and Efficiency: Random Reflections on Health Services)

Cochrane's short monograph made the case that the NHS should fund only treatments proven effective in randomized trials. It set the agenda for evidence-based medicine and named the later Cochrane Collaboration.

Cochrane AL. Effectiveness and Efficiency. Nuffield Provincial Hospitals Trust, 1972 · PubMed

1972 · Research Methods & Ethics

Tuskegee Syphilis Study Exposed

A 1932 federal study tracked syphilis in 600 Black men without treating them. Jean Heller's 1972 AP report ended it and led to the National Research Act, mandatory IRB review, and informed consent rules.

Jean Heller, Associated Press, July 1972; Ad Hoc Advisory Panel Final Report, 1973 · CDC

1973 · Foundational Discovery

Lauterbur's NMR imaging (zeugmatography), origin of MRI

Lauterbur used magnetic field gradients to locate NMR signals in space and reconstruct images, a method he called zeugmatography. With Peter Mansfield's faster techniques, MRI followed; the two shared the 2003 Nobel Prize.

Lauterbur PC. Nature. 1973;242:190-191. · PubMed

1974 · Public Health

WHO Expanded Programme on Immunization (EPI) launched

The 27th World Health Assembly created EPI in 1974 to vaccinate every child against six diseases. WHO and Lancet modelling credit vaccination with averting about 154 million deaths over 50 years, most in children under five.

Lancet, 2024 (50-year EPI modelling study) · PubMed

1975 · Oncology

Allogeneic bone marrow (hematopoietic stem cell) transplantation as curative therapy (Thomas)

Thomas's Seattle group showed that high-dose therapy followed by marrow from an HLA-matched sibling could cure leukemia and aplastic anemia, turning a uniformly fatal procedure into standard treatment.

N Engl J Med, 1975 · PubMed

1975 · Critical & Organ Care

Extracorporeal membrane oxygenation (ECMO) for neonatal respiratory failure (Bartlett)

In 1975 Bartlett's team kept a newborn with meconium aspiration alive on an external heart-lung circuit for days until her lungs recovered. ECMO later became standard rescue care in neonatal failure and severe ARDS.

J Thorac Cardiovasc Surg, 1977 (first clinical series; index case 1975) · PubMed

1975 · Genetics & Molecular

Southern blot: DNA detection by gel transfer and hybridization (Southern blotting (detection of specific sequences among DNA fragments separated by gel electrophoresis))

Southern's method let labs locate a specific DNA sequence among fragments separated by size, making the first molecular genetic diagnoses possible and seeding the Northern and Western blots and later array methods.

J Mol Biol. 1975 · PubMed

1976 · Oncology

Harald zur Hausen hypothesis linking HPV to cervical cancer

zur Hausen argued in 1976 that HPV, not herpesvirus, drives cervical cancer, then his lab cloned HPV-16 from tumors in 1983. The work won the 2008 Nobel and made HPV vaccines possible.

Proc Natl Acad Sci USA, 1983 · PubMed

1976 · Research Methods & Ethics

Large simple trials and trial overviews (Peto and colleagues) (ISIS, International Studies of Infarct Survival)

Peto and colleagues' 1976-77 trial-design papers introduced the logrank test and the case for large simple trials and pooled overviews. The Oxford ISIS trials, recruiting from 1981, put the megatrial approach into practice on heart attack treatment.

Br J Cancer 1976-1977; ISIS programme from 1981 · PubMed

1976 · Public Health

Nurses' Health Study

Begun in 1976 with 121,700 female nurses, it first tracked oral contraceptive use, then widened to diet, hormones, and lifestyle, producing decades of evidence on women's cancer and heart disease risk.

Am J Nurs, 1978 · PubMed

1977 · Genetics & Molecular

Sanger DNA Sequencing (dideoxy chain-termination method) (Dideoxynucleotide chain-termination sequencing)

Sanger's group used dideoxynucleotides to stop DNA synthesis at each base and read the sequence. The method drove the Human Genome Project and remains standard for confirming variants in clinical labs.

Proc Natl Acad Sci USA, 1977 · PubMed

1978 · Reproductive Health

Birth of Louise Brown: First Baby Conceived by In Vitro Fertilization

First human born from in vitro fertilization, after years of failed attempts. It opened a treatment route for infertility now used in millions of births, and Edwards received the 2010 Nobel Prize in Medicine.

Lancet, 1978 · PubMed

1978 · Surgery & Anesthesia

Ciclosporin in solid-organ transplantation (Calne) (cyclosporine; cyclosporin A)

Calne gave cyclosporin to seven cadaver-kidney recipients as primary immunosuppression. It controlled rejection but caused kidney and liver toxicity, so he urged caution. Broader use over the following years raised one-year graft survival well above prior rates.

Lancet, 1978 · PubMed

1978 · Genetics & Molecular

Recombinant Human Insulin (synthesis of the gene)

Bacteria expressing synthetic genes for insulin's two chains made the first human protein drug, ending reliance on pig and cattle pancreas. Humulin reached patients in 1982 as the first recombinant DNA medicine.

Proc Natl Acad Sci U S A. 1979 · PubMed

1979 · Oncology

Total Therapy / combination treatment curing childhood ALL (Acute Lymphoblastic Leukemia (ALL))

Pinkel's St. Jude Total Therapy added intrathecal methotrexate and cranial irradiation to multidrug chemotherapy, raising childhood ALL survival from near zero to roughly half and making cure a realistic goal.

Pinkel D. Cancer 1979;43:1128-1137 (Ninth Annual David Karnofsky Lecture; Total Therapy) · PubMed

1980 · Critical & Organ Care

Exogenous surfactant therapy for neonatal respiratory distress syndrome (Fujiwara)

Fujiwara instilled a modified bovine surfactant into the trachea of 10 preterm infants with hyaline membrane disease; oxygenation improved and eight survived, five under 1500 g. Surfactant replacement became standard after FDA approval in 1990.

Lancet, 1980 · PubMed

1980 · Public Health

Global Eradication of Smallpox

On 8 May 1980 the World Health Assembly declared smallpox eradicated, three years after the last endemic case in Somalia. It remains the only human disease ever eliminated, achieved through ring vaccination and surveillance-containment.

Strassburg MA, Am J Infect Control, 1982 (WHO Resolution WHA33.3, 1980) · PubMed

1980 · Cardiology

Implantable cardioverter-defibrillator first human implantation (Mirowski) (Automatic implantable cardioverter-defibrillator (ICD))

Mirowski's team implanted the first automatic defibrillator in February 1980 at Johns Hopkins, then reported in NEJM that the device sensed and shocked lethal ventricular arrhythmias in patients. ICDs now prevent sudden cardiac death.

New England Journal of Medicine, 1980 · PubMed

1981 · Infectious Disease

First report of AIDS (Pneumocystis pneumonia cluster)

On June 5, 1981, the CDC reported Pneumocystis pneumonia in five young men in Los Angeles. It was the first published recognition of AIDS, two years before HIV was identified as the cause.

MMWR Morb Mortal Wkly Rep, 1981 · PubMed

1982 · Endocrinology

Recombinant Human Insulin (Humulin) Approval

The first medicine made by recombinant DNA. Human insulin grown in engineered E. coli replaced animal-pancreas extracts and showed that bacteria could manufacture safe human proteins, starting the biotech drug industry.

Goeddel DV, et al. Proc Natl Acad Sci USA. 1979;76(1):106-110 · PubMed

1983 · Surgery & Anesthesia

Pulse oximetry enters routine clinical monitoring

Aoyagi's 1974 principle reached the bedside with the 1983 Nellcor monitor, putting continuous SpO2 in nearly every OR by 1986. Anesthesia deaths fell sharply in this era, though trials did not prove oximetry alone caused it.

J Biomed Opt, 2024 (narrative history) · PubMed

1984 · Infectious Disease

Marshall & Warren: Helicobacter pylori causes peptic ulcer disease

Marshall and Warren tied a stomach bacterium to gastritis and ulcers, turning most peptic ulcers into a curable infection treatable with antibiotics. They won the 2005 Nobel Prize in Physiology or Medicine.

Lancet, 1984 · PubMed

1984 · Public Health

Seat belt legislation and effectiveness evidence

New York's 1984 mandate was the first U.S. seat belt use law. Belt use roughly doubled within months, and follow-up data tied higher use to fewer occupant deaths, showing legislation can change behavior at population scale.

J Trauma, 1986 · PubMed

1985 · Surgery & Anesthesia

First Laparoscopic Cholecystectomy

Muhe removed a gallbladder through small ports rather than a wide incision in 1985. German surgeons rejected the method, but it became standard within a decade and spread to other abdominal operations.

JSLS, 2001 · PubMed

1985 · Genetics & Molecular

Polymerase Chain Reaction (PCR)

PCR let labs copy a chosen DNA sequence millions of times from trace samples. It made molecular diagnostics, genetic testing, and forensic identification routine. Mullis shared the 1993 Nobel Prize in Chemistry for the method.

Science. 1985;230(4732):1350-1354. · PubMed

1986 · Cardiology

GISSI-1 (Effectiveness of intravenous thrombolytic treatment in acute myocardial infarction) (Gruppo Italiano per lo Studio della Streptochinasi nell'Infarto Miocardico, first trial)

This 11,806-patient Italian trial showed intravenous streptokinase cut 21-day death after acute MI from 13% to 10.7%, with most benefit in the first 3 hours. It made early thrombolysis routine care.

Lancet. 1986;1(8478):397-402. · PubMed

1987 · Infectious Disease

AZT (Zidovudine) Trial for AIDS (Azidothymidine)

The first drug shown to extend survival in AIDS. In 282 patients, AZT cut deaths to 1 versus 19 on placebo over the trial period, which was halted early. The FDA approved it in March 1987 and antiretroviral therapy began.

N Engl J Med. 1987;317(4):185-191 · PubMed

1987 · Cardiology

CONSENSUS (Cooperative North Scandinavian Enalapril Survival Study)

First trial showing an ACE inhibitor cuts death in heart failure: among 253 patients with NYHA class IV disease, enalapril lowered 6-month mortality from 44% to 26%, establishing neurohormonal blockade in treatment.

N Engl J Med. 1987;316(23):1429-1435. · PubMed

1987 · Cardiology

FDA approval of lovastatin, the first statin (HMG-CoA reductase inhibitor) (3-hydroxy-3-methylglutaryl-coenzyme A reductase inhibitor)

Lovastatin was the first HMG-CoA reductase inhibitor the FDA approved, in 1987. It came from Akira Endo's 1973 work on fungal compounds and opened the statin class now used to lower LDL and prevent heart disease.

Proc Jpn Acad Ser B Phys Biol Sci, 2010 · PubMed

1987 · Neurology & Psychiatry

Fluoxetine (Prozac) approval: first widely used SSRI (Selective serotonin reuptake inhibitor)

FDA approval of fluoxetine on Dec 29, 1987 gave clinicians an antidepressant far less lethal in overdose than tricyclics, making drug treatment of depression routine in primary care and vastly more common.

Wong DT et al. Nat Rev Drug Discov. 2005 (discovery case history); FDA approval 1987. · PubMed

1987 · Infectious Disease

Haemophilus influenzae type b (Hib) conjugate vaccine (Haemophilus influenzae type b conjugate vaccine)

Conjugating Hib polysaccharide to a carrier protein produced antibody in young children, where plain polysaccharide failed. Infant formulations licensed by 1990 dropped invasive Hib disease over 99% and set the template for pneumococcal and meningococcal vaccines.

N Engl J Med, 1990 (infant efficacy field trial; first conjugate licensed 1987) · PubMed

1988 · Cardiology

ISIS-2 (Second International Study of Infarct Survival)

Aspirin alone cut vascular death by about a quarter after acute MI, matching streptokinase, and the two combined reduced deaths by roughly 40 percent. This put aspirin into routine MI care and launched wide antiplatelet use.

Lancet. 1988;2(8607):349-360. · PubMed

1989 · Critical & Organ Care

First Successful Living-Donor Liver Transplant

Strong's team in Brisbane gave a mother's liver segment to her toddler son in 1989, the first living-donor liver transplant with a surviving recipient. Both lived; the technique opened a donor source independent of deceased organs.

N Engl J Med, 1990 · PubMed

1990 · Genetics & Molecular

First Approved Human Gene Therapy (ADA-SCID, Ashanthi DeSilva) (Adenosine deaminase-deficient severe combined immunodeficiency)

First authorized human gene therapy. T cells carrying a working ADA gene restored T-cell counts and immune responses, though the effect was partial and patients stayed on enzyme replacement. It showed gene transfer into patient cells was feasible.

Blaese RM, et al. Science. 1995;270(5235):475-480. · PubMed

1991 · Reproductive Health

MRC Vitamin Study: Folic Acid Prevents Neural Tube Defect Recurrence (Medical Research Council Vitamin Study)

A randomized double-blind trial of 1,817 high-risk women found folic acid cut neural tube defect recurrence by 72% (RR 0.28). The result drove folic acid recommendations and mandatory grain fortification in many countries.

Lancet, 1991 · PubMed

1991 · Cardiology

SOLVD Treatment Trial (Studies of Left Ventricular Dysfunction (Treatment Trial))

Showed enalapril lowered mortality 16 percent in mild-to-moderate symptomatic heart failure with low ejection fraction, extending the survival benefit ACE inhibitors had shown in severe disease to a much larger patient group.

N Engl J Med. 1991;325(5):293-302. · PubMed

1992 · Reproductive Health

Czeizel & Dudas: Folic Acid Prevents First-Occurrence Neural Tube Defects

Randomized trial in women with no prior affected pregnancy found zero neural tube defects on periconceptional folic acid versus six on trace elements. With the 1991 MRC recurrence trial, it set the case for supplementation and food fortification.

N Engl J Med. 1992;327(26):1832-1835 · PubMed

1992 · Research Methods & Ethics

Evidence-based medicine: a new approach to teaching the practice of medicine (Evidence-Based Medicine Working Group)

Guyatt and the JAMA Working Group gave the term evidence-based medicine its definition, asking physicians to weight clinical research over unsystematic experience. It reset how medicine is taught and how guidelines are built.

JAMA 1992;268(17):2420-2425 · PubMed

1993 · Endocrinology

DCCT (Diabetes Control and Complications Trial)

In 1,441 patients with type 1 diabetes, intensive insulin therapy cut retinopathy by 76% and clinical neuropathy by 60%, at the cost of two to three times more severe hypoglycemia. It set HbA1c-guided control as standard care.

N Engl J Med. 1993 · PubMed

1993 · Research Methods & Ethics

Founding of the Cochrane Collaboration

Named for Archie Cochrane, the network gave systematic reviews common methods and a shared library, turning evidence synthesis into routine input for clinical guidelines and health policy worldwide.

Bero & Rennie, JAMA 1995 · PubMed

1993 · Neurology & Psychiatry

Interferon beta-1b for relapsing-remitting MS (Interferon Beta Multiple Sclerosis Study Group)

The first proven disease-modifying therapy for MS. In this trial interferon beta-1b lowered relapse rates and MRI activity, and it became the first such drug FDA-approved for MS in 1993.

Neurology, 1993 · PubMed

1994 · Cardiology

4S (Scandinavian Simvastatin Survival Study)

First trial to show a statin cuts deaths. In 4,444 patients with coronary disease and high cholesterol, simvastatin lowered all-cause mortality 30% and coronary deaths 42% over 5.4 years, settling whether cholesterol lowering saves lives.

Lancet. 1994;344(8934):1383-1389. · PubMed

1994 · Cardiology

Antiplatelet Trialists' Collaboration Overview (Collaborative overview of randomised trials of antiplatelet therapy)

Pooling 145 trials in about 100,000 patients, this overview found aspirin cut nonfatal MI, nonfatal stroke, and vascular death by roughly a third in high-risk patients, settling questions single trials could not.

BMJ 1994;308:81-106 · PubMed

1994 · Endocrinology

Discovery of Leptin

Friedman's lab cloned the ob gene and showed fat tissue makes a hormone, leptin, that reports fat stores to the brain. It made adipose tissue an endocrine organ and recast obesity as a problem of body-weight regulation.

Nature, 1994 · PubMed

1995 · Reproductive Health

Collaborative Eclampsia Trial: Magnesium Sulfate for Eclampsia (The Eclampsia Trial Collaborative Group: Which anticonvulsant for women with eclampsia?)

In 1,687 women with eclampsia, magnesium sulfate cut recurrent seizures by 52% versus diazepam and 67% versus phenytoin. The result made it the standard treatment for eclamptic convulsions worldwide.

Lancet, 1995 · PubMed

1995 · Neurology & Psychiatry

NINDS rt-PA Stroke Trial (National Institute of Neurological Disorders and Stroke recombinant tissue plasminogen activator Stroke Study)

In 624 patients, IV t-PA given within 3 hours of ischemic stroke made patients at least 30 percent more likely to have little or no disability at 3 months, despite a 6.4 percent rate of symptomatic brain hemorrhage versus 0.6 percent on placebo.

N Engl J Med. 1995 · PubMed

1995 · Cardiology

WOSCOPS (West of Scotland Coronary Prevention Study)

First trial showing a statin prevents first heart attacks in people with no prior heart disease. Pravastatin cut coronary events 31% in men with high cholesterol, opening the case for statin primary prevention.

N Engl J Med. 1995;333(20):1301-1307. · PubMed

1996 · Research Methods & Ethics

CONSORT Statement (Consolidated Standards of Reporting Trials)

A 21-item checklist and patient flow diagram for reporting randomized trials. Major journals soon required it, and the standard has been revised repeatedly, with CONSORT 2025 the current version.

JAMA, 1996 · PubMed

1996 · Infectious Disease

Highly Active Antiretroviral Therapy (HAART) and the Vancouver protease-inhibitor combination era

At Vancouver in 1996 researchers reported that adding a protease inhibitor to two nucleoside drugs durably suppressed HIV. The ACTG 320 trial then confirmed it, cutting progression to AIDS or death by about half.

N Engl J Med, 1997 (ACTG 320); Vancouver XI Intl AIDS Conf, 1996 · PubMed

1997 · Infectious Disease

ACTG 320: Triple-Drug Combination Antiretroviral Therapy (AIDS Clinical Trials Group Protocol 320)

In 1,156 patients with advanced HIV, indinavir added to two nucleosides dropped progression to AIDS or death from 11% to 6% and mortality from 3.1% to 1.4%, fixing three-drug therapy as standard care.

N Engl J Med. 1997;337(11):725-733 · PubMed

1997 · Reproductive Health

Dolly the Cloned Sheep

Wilmut's team cloned a sheep from an adult mammary cell, showing a fully differentiated cell could be reprogrammed to make a whole animal. The result opened modern cloning, nuclear reprogramming research, and decades of bioethics debate.

Nature. 1997;385(6619):810-813. · PubMed

1998 · Oncology

NSABP P-1 Breast Cancer Prevention Trial (tamoxifen) (National Surgical Adjuvant Breast and Bowel Project Breast Cancer Prevention Trial)

First trial to show a drug could prevent breast cancer in high-risk women, cutting invasive cases by about half. It led to FDA approval of tamoxifen for prevention and started the field of cancer chemoprevention.

J Natl Cancer Inst 1998;90:1371-1388 · PubMed

1998 · Endocrinology

UK Prospective Diabetes Study (UKPDS 33)

Two 1998 reports from a UK trial of 5,102 patients: intensive glucose control cut microvascular complications by about 25%, and metformin in overweight patients lowered diabetes-related death and heart attack. Metformin became first-line.

Lancet, 1998 · PubMed

2000 · Critical & Organ Care

ARDSNet ARMA low tidal volume ventilation trial (Acute Respiratory Distress Syndrome Network, Acute Respiratory Distress Syndrome Mechanical ventilation Assessment trial)

This trial of 861 ARDS patients cut mortality from 40% to 31% by limiting tidal volume to 6 mL/kg of predicted body weight, making lung-protective ventilation standard ICU practice.

N Engl J Med. 2000;342:1301-1308. · PubMed

2000 · Surgery & Anesthesia

FDA Clearance of the da Vinci Surgical System

First FDA-cleared robotic platform for general laparoscopic surgery. It later became the common approach for radical prostatectomy and spread to many gynecologic and abdominal operations, though it raised device cost.

U.S. FDA 510(k) K990144, Intuitive Surgical da Vinci Surgical System. 2000. · FDA

2000 · Cardiology

HOPE (Heart Outcomes Prevention Evaluation)

In 9,297 high-risk patients without heart failure, ramipril cut cardiovascular death, MI, and stroke from 17.8% to 14.0%. The benefit was larger than blood-pressure lowering alone predicted, and ACE inhibitor use spread to vascular protection.

N Engl J Med. 2000;342(3):145-153. · PubMed

2001 · Genetics & Molecular

Human Genome Project: First Draft Human Genome Sequence (International Human Genome Sequencing Consortium)

The public consortium's draft covered about 94 percent of the genome and was placed in open databases, giving clinicians and researchers a free reference for finding disease genes and reading individual variation.

Nature, 2001 · PubMed

2001 · Oncology

Imatinib (STI571, Gleevec) in chronic myeloid leukemia (Imatinib mesylate (signal transduction inhibitor 571))

A BCR-ABL kinase inhibitor cleared the blood counts in 53 of 54 chronic-phase CML patients who had failed interferon. It showed a drug aimed at a single oncogenic protein could control cancer, and reset how leukemia was treated.

N Engl J Med 2001;344:1031-1037 · PubMed

2001 · Critical & Organ Care

Rivers Early Goal-Directed Therapy for Sepsis (Early Goal-Directed Therapy (EGDT) in severe sepsis and septic shock)

A single-center trial of 263 patients found a protocol of early fluids, pressors, transfusion, and inotropes cut in-hospital mortality to 30.5% from 46.5%. Later multicenter trials (ProCESS, ARISE, ProMISe) found no such benefit.

N Engl J Med. 2001 · PubMed

2002 · Cardiology

Heart Protection Study (HPS) (MRC/BHF Heart Protection Study)

In 20,536 high-risk patients, 40 mg simvastatin cut major vascular events by about a quarter, with similar relative benefit even when baseline LDL was low. Risk, not starting cholesterol, set who gained.

Lancet. 2002;360(9326):7-22. · PubMed

2002 · Reproductive Health

Magpie Trial: Magnesium Sulfate for Pre-eclampsia (Magnesium Sulphate for Prevention of Eclampsia)

Across 10,141 women in 33 countries, magnesium sulfate roughly halved eclampsia risk with no clear short-term harm, settling decades of debate and making it the standard prophylaxis in pre-eclampsia.

Lancet, 2002 · PubMed

2002 · Reproductive Health

Women's Health Initiative: Estrogen plus Progestin Hormone Therapy

This randomized trial of 16,608 women was halted at 5.2 years when combined estrogen-progestin raised breast cancer, heart disease, stroke, and clot risk. It ended the assumption that hormone therapy protected the heart, and prescribing fell sharply.

JAMA. 2002;288(3):321-333 · PubMed

2003 · Genetics & Molecular

Human Genome Project Completion (International Human Genome Sequencing Consortium)

On 14 April 2003 the public consortium declared the human genome essentially finished, 50 years after Watson and Crick described the double helix. The 2004 Nature paper documented 99% of the euchromatic sequence at 99.99% accuracy.

Nature. 2004;431(7011):931-945. · PubMed

2003 · Oncology

IRIS trial of imatinib versus interferon in CML (International Randomized Study of Interferon and STI571)

In 1,106 patients, imatinib gave a complete cytogenetic response rate of 76% versus 15% for interferon plus cytarabine at 18 months, with better tolerability. It made a kinase inhibitor the first-line treatment for CML.

N Engl J Med 2003;348:994-1004 · PubMed

2003 · Cardiology

Primary PCI versus thrombolysis for acute STEMI (Keeley meta-analysis of 23 trials) (PAMI = Primary Angioplasty in Myocardial Infarction)

Pooling 23 trials in 7,739 STEMI patients, primary angioplasty beat thrombolysis on death, reinfarction, and stroke. The result set off the worldwide move to mechanical reperfusion and door-to-balloon programs.

Lancet, 2003 · PubMed

2004 · Reproductive Health

Women's Health Initiative: Estrogen-Alone Hormone Therapy

In 10,739 hysterectomized women, estrogen alone left coronary heart disease unchanged (HR 0.91) and raised stroke risk (HR 1.39), with breast cancer trending lower (HR 0.77). Estrogen offered no net benefit for prevention.

JAMA, 2004 · PubMed

2005 · Oncology

Early Breast Cancer Trialists' Collaborative Group (EBCTCG) overview of adjuvant tamoxifen

Pooling about 20 trials, five years of tamoxifen cut the yearly breast cancer death rate by roughly a third in ER-positive disease, with gains holding to 15 years. It set adjuvant endocrine therapy as standard for hormone-positive tumors.

Lancet, 2005 · PubMed

2005 · Research Methods & Ethics

Ioannidis, "Why Most Published Research Findings Are False"

Using a Bayesian model, Ioannidis showed that the odds a published claim is true drop as studies shrink, effects get smaller, and analyses turn flexible. The argument pushed biomedicine toward preregistration and replication.

PLoS Medicine, 2005 · NIH

2005 · Public Health

WHO Framework Convention on Tobacco Control (FCTC) enters into force (World Health Organization Framework Convention on Tobacco Control)

The first treaty negotiated under WHO authority, in force since 27 February 2005. It set binding obligations for ratifying countries on tobacco taxes, advertising bans, smoke-free laws, and packaging warnings, and now covers most of the world's population.

Bulletin of the World Health Organization, 2010 (treaty entered into force 27 February 2005) · NIH

2006 · Infectious Disease

FUTURE / Quadrivalent HPV Vaccine Efficacy Trials (Females United to Unilaterally Reduce Endo/Ectocervical Disease)

In women not already infected, the quadrivalent vaccine cut HPV 16/18-related high-grade cervical precancers by 98% in the per-protocol group. The FDA licensed Gardasil in June 2006, making a leading cause of cervical cancer vaccine-preventable.

N Engl J Med, 2007 · PubMed

2006 · Foundational Discovery

Induced Pluripotent Stem Cells (iPSCs)

Yamanaka's team turned adult mouse skin cells back into pluripotent stem cells with four genes, giving researchers patient-matched cells without embryos for disease modeling and drug testing. The work won the 2012 Nobel Prize.

Cell. 2006;126(4):663-676. · PubMed

2006 · Neurology & Psychiatry

STAR*D sequenced antidepressant treatment study (Sequenced Treatment Alternatives to Relieve Depression)

Across four sequential steps in 3,671 outpatients, remission fell with each step (about 37%, 31%, 14%, 13%) for a cumulative rate near 67%, and relapse rose in those needing more steps. It set realistic expectations for treating depression.

Am J Psychiatry. 2006;163(11):1905-1917. · PubMed

2008 · Endocrinology

ACCORD (Action to Control Cardiovascular Risk in Diabetes)

In 10,251 high-risk type 2 diabetics, pushing HbA1c below 6% raised mortality (HR 1.22) versus standard care, so the intensive arm was halted in 2008. It set the case for individualized, looser glucose targets.

N Engl J Med. 2008 · PubMed

2009 · Cardiology

RE-LY (Dabigatran versus warfarin in atrial fibrillation) (Randomized Evaluation of Long-Term Anticoagulation Therapy)

First large trial of a direct oral anticoagulant in atrial fibrillation. Dabigatran 150 mg beat warfarin for stroke prevention with less intracranial bleeding and no INR checks, opening the DOAC era before ROCKET-AF and ARISTOTLE.

N Engl J Med. 2009;361(12):1139-1151. · PubMed

2009 · Surgery & Anesthesia

WHO Surgical Safety Checklist (World Health Organization Surgical Safety Checklist)

In eight hospitals across rich and poor countries, a 19-item checklist run at three surgical pause points cut inpatient deaths from 1.5% to 0.8% and complications from 11% to 7%, prompting wide adoption.

N Engl J Med. 2009;360(5):491-499. · PubMed

2010 · Oncology

Ipilimumab improves survival in metastatic melanoma (Ipilimumab is an anti-CTLA-4 monoclonal antibody (CTLA-4 = cytotoxic T-lymphocyte-associated antigen 4))

First randomized trial to show any drug extends survival in metastatic melanoma, and the first proof that blocking an immune checkpoint, here CTLA-4, treats advanced cancer. Median survival rose from 6.4 to about 10 months.

N Engl J Med 2010;363:711-723 · PubMed

2011 · Infectious Disease

HPTN 052: Antiretroviral Therapy as HIV Prevention (HIV Prevention Trials Network 052)

A randomized trial in 1,763 serodiscordant couples found that starting antiretroviral therapy early cut HIV transmission by 96%, with one linked infection in the early-treatment group. The result moved policy toward treating everyone at diagnosis.

N Engl J Med. 2011;365(6):493-505 · PubMed

2011 · Oncology

National Lung Screening Trial (NLST)

First randomized trial to show a screening test cuts lung cancer death. Across 53,454 heavy smokers, three annual low-dose CT scans lowered lung cancer mortality 20% versus chest x-ray, prompting USPSTF screening guidance.

N Engl J Med. 2011;365:395-409. · PubMed

2011 · Infectious Disease

RTS,S/AS01 (Mosquirix) Malaria Vaccine Phase 3 Trial (RTS,S/AS01 stands for the recombinant hepatitis B surface antigen fusion protein (R), the repeat (R) and T-cell epitope (T) regions of the P. falciparum circumsporozoite protein, plus hepatitis B surface antigen (S), with the AS01 adjuvant system; trade name Mosquirix)

First malaria vaccine to show efficacy in a phase 3 trial. Protection was partial and waned, but the data led WHO in 2021 to recommend it for African children, the first vaccine endorsed against any human parasitic disease.

N Engl J Med. 2011;365(20):1863-1875 · PubMed

2012 · Oncology

Anti-PD-1 antibody activity across multiple solid tumors (BMS-936558, later nivolumab (also MDX-1106, ONO-4538))

A phase 1 trial of anti-PD-1 (nivolumab) found durable responses in melanoma, lung, and kidney cancer, with rates near 18 to 28 percent. It showed PD-1 blockade worked across several tumor types and started the wider use of these drugs.

N Engl J Med 2012;366:2443-2454 · PubMed

2012 · Genetics & Molecular

CRISPR-Cas9 Programmable Genome Editing (Clustered Regularly Interspaced Short Palindromic Repeats with CRISPR-associated protein 9)

A single engineered guide RNA could direct the Cas9 protein to cut any chosen DNA sequence. Cheap and easy to reprogram, the method reached approved gene therapies within a decade and earned the 2020 Nobel Prize in Chemistry.

Science. 2012;337(6096):816-821. · PubMed

2013 · Critical & Organ Care

PROSEVA prone positioning in severe ARDS (Proning Severe ARDS Patients)

In 466 patients with severe ARDS, daily 16-hour prone sessions cut 28-day mortality to 16.0% from 32.8%. Results held at 90 days and the maneuver was used widely during COVID-19.

N Engl J Med. 2013;368:2159-2168. · PubMed

2014 · Infectious Disease

Ledipasvir-Sofosbuvir for Hepatitis C (ION-1) (Ion-1: Ledipasvir and Sofosbuvir for Untreated HCV Genotype 1 Infection)

This phase 3 trial of 865 untreated genotype 1 patients showed 12 weeks of a single daily ledipasvir-sofosbuvir tablet cured 97 to 99 percent, with no benefit from added ribavirin or longer treatment.

N Engl J Med. 2014;370(20):1889-1898 · PubMed

2015 · Endocrinology

EMPA-REG OUTCOME (Empagliflozin Cardiovascular Outcome Event Trial in Type 2 Diabetes Mellitus Patients)

First glucose-lowering drug to lower cardiovascular and all-cause death in type 2 diabetes, with a 38% cut in cardiovascular mortality. It turned SGLT2 inhibitors into heart and kidney drugs, not just glucose drugs.

N Engl J Med. 2015;373(22):2117-2128. · PubMed

2015 · Neurology & Psychiatry

Endovascular thrombectomy trials (MR CLEAN and HERMES) (MR CLEAN: Multicenter Randomized Clinical Trial of Endovascular Treatment for Acute Ischemic Stroke in the Netherlands; HERMES: Highly Effective Reperfusion evaluated in Multiple Endovascular Stroke trials)

MR CLEAN was the first trial to prove mechanical clot removal beat medical care alone for large-vessel stroke; the 2016 HERMES analysis pooling five trials confirmed it, with one extra independent survivor for about every 2.6 patients treated.

N Engl J Med. 2015 (MR CLEAN); Lancet. 2016 (HERMES) · PubMed

2015 · Cardiology

SPRINT (Systolic Blood Pressure Intervention Trial)

In 9,361 high-risk non-diabetic adults, targeting systolic BP below 120 rather than below 140 cut major cardiovascular events about 25% and all-cause death about 27%. The result drove the lower thresholds in the 2017 ACC/AHA guidelines.

N Engl J Med. 2015;373(22):2103-2116. · PubMed

2016 · Endocrinology

LEADER (Liraglutide Effect and Action in Diabetes: Evaluation of Cardiovascular Outcome Results)

First trial to show a GLP-1 receptor agonist lowers cardiovascular events in high-risk type 2 diabetics. Liraglutide cut the composite endpoint and cardiovascular death, moving the class into diabetes guidelines for patients with heart disease.

N Engl J Med. 2016;375(4):311-322. · PubMed

2017 · Reproductive Health

ASPRE Trial: Aspirin for Prevention of Preterm Pre-eclampsia (Aspirin for Evidence-Based Preeclampsia Prevention Trial)

In 1,776 high-risk women, 150 mg aspirin nightly from 11 to 14 weeks cut preterm pre-eclampsia from 4.3% to 1.6% (OR 0.38). It backed first-trimester screening plus aspirin in prevention guidelines.

N Engl J Med. 2017;377(7):613-622 · PubMed

2017 · Infectious Disease

Ervebo (rVSV-ZEBOV) Ebola Vaccine: Ebola Ça Suffit! Ring Vaccination Trial (Ebola Ça Suffit! (Ebola, that's enough!) ring vaccination trial; rVSV-ZEBOV = recombinant vesicular stomatitis virus Zaire Ebolavirus vaccine)

A ring-vaccination trial in Guinea found no Ebola cases beginning 10 days after a single dose of rVSV-ZEBOV. The vaccine, marketed as Ervebo, won FDA approval in 2019, the first licensed Ebola vaccine.

Lancet. 2017;389(10068):505-518 · PubMed

2017 · Cardiology

FOURIER (Evolocumab / PCSK9 inhibition) and the PCSK9 era (Further Cardiovascular Outcomes Research With PCSK9 Inhibition in Subjects With Elevated Risk)

In 27,564 statin-treated patients, adding evolocumab cut median LDL to 30 mg/dL and lowered cardiovascular events by 15%, showing benefit well below prior targets and bringing PCSK9 inhibitors into practice.

N Engl J Med, 2017 · PubMed

2017 · Oncology

Tisagenlecleucel (Kymriah): First FDA-Approved CAR-T Cell Therapy

In August 2017 the FDA approved Kymriah for relapsed or refractory B-cell ALL in patients up to age 25, the first gene-modified cell therapy cleared in the US. The ELIANA trial showed 81% remission within three months.

N Engl J Med. 2018;378(5):439-448. · PubMed

2017 · Genetics & Molecular

Voretigene Neparvovec (Luxturna): First FDA-Approved In Vivo Gene Therapy for an Inherited Disease (Voretigene neparvovec-rzyl (Luxturna))

First gene therapy injected directly into the body to win FDA approval, on December 19, 2017. A single subretinal dose of a working RPE65 gene improved low-light navigation in patients with biallelic RPE65 retinal dystrophy.

Lancet, 2017 · PubMed

2017 · Reproductive Health

WOMAN Trial: Tranexamic Acid for Postpartum Hemorrhage (World Maternal Antifibrinolytic Trial)

A randomized trial of 20,060 women found 1 g IV tranexamic acid reduced death from postpartum bleeding, most when given within 3 hours. WHO added it to its PPH treatment recommendation that year.

The Lancet, 2017 · PubMed

2018 · Neurology & Psychiatry

DAWN: extended-window thrombectomy (DWI or CTP Assessment with Clinical Mismatch in the Triage of Wake-Up and Late Presenting Strokes Undergoing Neurointervention with Trevo)

DAWN randomized 206 patients with large-vessel occlusion 6 to 24 hours from last-known-well; those selected by clinical-imaging mismatch had less disability at 90 days with thrombectomy, extending treatment well past the 6-hour window.

N Engl J Med. 2018;378(1):11-21. · PubMed

2018 · Oncology

Nobel Prize in Physiology or Medicine for cancer immune-checkpoint therapy

Allison's CTLA-4 and Honjo's PD-1 work showed that blocking the immune system's own brakes lets T cells attack tumors. The 2018 prize marked checkpoint blockade as a treatment class for melanoma, lung, and other cancers.

Nobel Assembly, Karolinska Institutet, 2018 · PubMed Central

2019 · Cardiology

DAPA-HF (Dapagliflozin in heart failure with reduced ejection fraction) (Dapagliflozin and Prevention of Adverse Outcomes in Heart Failure)

In 4,744 HFrEF patients, dapagliflozin cut worsening heart failure or cardiovascular death versus placebo, and the benefit held whether or not patients had diabetes, moving SGLT2 inhibitors into routine heart failure treatment.

N Engl J Med. 2019;381(21):1995-2008. · PubMed

2019 · Neurology & Psychiatry

Esketamine (Spravato) for treatment-resistant depression

The FDA approved intranasal esketamine in March 2019 for treatment-resistant depression, the first antidepressant acting on the NMDA glutamate pathway rather than monoamines, with effects measurable within days.

Am J Psychiatry, 2019 · PubMed

2020 · Infectious Disease

BNT162b2 mRNA COVID-19 Vaccine (Pfizer-BioNTech) (BioNTech/Pfizer COVID-19 vaccine, tozinameran (Comirnaty))

In a 43,548-person trial, two doses of the mRNA vaccine BNT162b2 cut symptomatic COVID-19 by 95% (8 vaccine vs 162 placebo cases). It was the first authorized COVID-19 vaccine and first efficacy proof for the mRNA platform.

N Engl J Med. 2020;383(27):2603-2615 · PubMed

2020 · Infectious Disease

COVID-19 mRNA vaccine efficacy trials

Among 43,448 participants, BNT162b2 cut symptomatic COVID-19 by 95% (8 vaccine cases vs 162 on placebo). It was the first mRNA vaccine cleared for human use, with a design fixed days after the viral sequence was published.

N Engl J Med. 2020;383(27):2603-2615 · PubMed

2020 · Oncology

NELSON lung cancer screening trial (Nederlands-Leuvens Longkanker Screenings Onderzoek (Dutch-Belgian Lung Cancer Screening Trial))

A Dutch-Belgian trial of high-risk men found volume-based low-dose CT screening cut lung cancer deaths by 24% at 10 years versus no screening, with few unnecessary workups, backing the earlier NLST finding.

N Engl J Med. 2020;382:503-513. · PubMed

2020 · Public Health

Population evidence that HPV vaccination prevents invasive cervical cancer

Earlier HPV vaccine studies tracked precancers. This Swedish cohort of 1.67 million was the first to show vaccination lowers actual invasive cervical cancer, with an 88% lower risk when given before age 17.

N Engl J Med 2020;383:1340-1348 · PubMed

2020 · Infectious Disease

RECOVERY Trial: Dexamethasone for COVID-19 (Randomised Evaluation of COVID-19 Therapy)

First drug shown to cut COVID-19 deaths. In RECOVERY, dexamethasone lowered 28-day mortality from 25.7% to 22.9%, with the largest effect in ventilated patients (about one-third fewer deaths). It became standard care within days.

N Engl J Med. 2021;384(8):693-704 (preliminary report June 2020) · PubMed

2021 · Surgery & Anesthesia

Genetically Modified Pig-to-Human Kidney Xenotransplant

In September 2021 an NYU team connected an alpha-gal knockout pig kidney to a brain-dead person. It made urine and avoided hyperacute rejection over 54 hours, the first such test of a gene-edited animal organ in a human body.

N Engl J Med, 2022 · PubMed

2021 · Endocrinology

STEP 1 (Semaglutide for Obesity) (Semaglutide Treatment Effect in People with obesity, trial 1)

A GLP-1 drug delivered about 15% mean weight loss in non-diabetic adults, far beyond prior obesity medications and within range of some bariatric surgery, which moved semaglutide into mainstream obesity treatment.

N Engl J Med, 2021 · PubMed

2022 · Endocrinology

SURMOUNT-1 (Tirzepatide for Obesity) (Study of Tirzepatide in Participants With Obesity or Overweight)

Tirzepatide cut body weight by about a fifth at 72 weeks in adults with obesity, a step beyond earlier GLP-1 drugs and the first dual GIP/GLP-1 agonist to reach this level in a phase 3 obesity trial.

N Engl J Med. 2022;387(3):205-216. · PubMed

2023 · Genetics & Molecular

Exagamglogene Autotemcel (Casgevy): First Approved CRISPR-Based Therapy

First CRISPR gene-editing therapy to win regulatory approval. UK MHRA cleared it in November 2023, the US FDA that December, for sickle cell disease and transfusion-dependent beta-thalassemia by editing BCL11A to raise fetal hemoglobin.

Frangoul H, et al. N Engl J Med. 2021;384(3):252-260 (pivotal trial data); UK MHRA and US FDA approvals 2023. · PubMed

2023 · Neurology & Psychiatry

Lecanemab (CLARITY AD): anti-amyloid antibody for Alzheimer disease (CLARITY AD: Clarity in Alzheimer's Disease)

First Alzheimer drug to gain traditional FDA approval on clinical benefit rather than a surrogate. Over 18 months it cut decline on the CDR-SB scale by 27% versus placebo and cleared amyloid, with ARIA brain swelling or bleeding in 12.6%.

N Engl J Med. 2023;388(1):9-21. · PubMed

2023 · Endocrinology

SELECT (Semaglutide Cardiovascular Outcomes in Obesity) (Semaglutide Effects on Cardiovascular Outcomes in People with Overweight or Obesity)

In 17,604 adults with obesity and cardiovascular disease but no diabetes, weekly semaglutide cut cardiovascular death, heart attack, and stroke by 20% over about 40 months, the first such benefit shown for an obesity drug.

N Engl J Med. 2023 · PubMed

2024 · Neurology & Psychiatry

Donanemab (Kisunla) for early Alzheimer disease (Kisunla; TRAILBLAZER-ALZ 2)

Second anti-amyloid antibody approved for early Alzheimer disease, cleared July 2024. It slowed clinical decline by roughly a quarter over 18 months and can be stopped once amyloid is cleared, but carries a warning for amyloid-related brain swelling and bleeding.

FDA approval, July 2024 · FDA

2024 · Surgery & Anesthesia

First gene-edited pig kidney transplanted into a living person (Porcine xenotransplant, Massachusetts General Hospital)

Surgeons transplanted a gene-edited pig kidney into a living patient with kidney failure in March 2024, the first such procedure in a living human after earlier work in brain-dead recipients. The patient died about two months later from causes the hospital said were unrelated to the organ.

Nat Med (news), 2024 · PubMed

2024 · Public Health

Nirsevimab cuts infant RSV hospitalization (Beyfortus)

In the first full U.S. season of wide use, the long-acting antibody was about 90 percent effective at preventing RSV hospitalization in infants. Admissions fell sharply where nirsevimab and the maternal RSV vaccine were available.

MMWR, 2024 · CDC

2024 · Endocrinology

Resmetirom (Rezdiffra), first drug for MASH (Rezdiffra; MAESTRO-NASH)

First drug ever approved for metabolic dysfunction-associated steatohepatitis (formerly NASH) with moderate to advanced fibrosis. In MAESTRO-NASH the oral thyroid hormone receptor-beta agonist resolved steatohepatitis in about 26 to 30 percent of patients versus 10 percent on placebo.

FDA approval, March 2024 · FDA

2024 · Oncology

Tarlatamab (Imdelltra) for small cell lung cancer (Imdelltra; DeLLphi-301)

First-in-class antibody that links DLL3 on tumor cells to a patient T cell, given accelerated approval in May 2024 for extensive-stage small cell lung cancer after chemotherapy. A later randomized trial extended median survival to about 13.6 months versus 8.3 months with chemotherapy.

FDA approval, May 2024 · FDA

2024 · Endocrinology

Tirzepatide (Zepbound) for obstructive sleep apnea (Zepbound; SURMOUNT-OSA)

First drug approved for moderate to severe obstructive sleep apnea in adults with obesity, cleared December 2024. In SURMOUNT-OSA it cut apnea-hypopnea events by about 25 to 29 per hour, an option beyond positive airway pressure.

FDA approval, December 2024 · FDA

2025 · Infectious Disease

Gepotidacin (Blujepa), first new oral antibiotic class in decades (Blujepa; EAGLE trials)

First-in-class oral antibiotic with a new dual mechanism, approved in 2025 for uncomplicated urinary tract infection and later for uncomplicated gonorrhea. The first new oral antibiotic class for gonorrhea in over three decades, important as resistant strains spread.

FDA approval, 2025 · FDA

2025 · Infectious Disease

Lenacapavir (Yeztugo), twice-yearly HIV prevention (Yeztugo; PURPOSE trials)

FDA approval in June 2025 made lenacapavir the first twice-yearly injectable for HIV pre-exposure prophylaxis. In the PURPOSE trials it cut infections by about 96 percent versus daily pills and prevented every infection among women in PURPOSE 1, addressing the adherence gap of daily PrEP.

FDA approval, June 2025 · PubMed