Knowra Johannes Fibiger Johannes Fibiger Johannes Fibiger (1867–1928) was a Danish physician and pathologist awarded the 1926 Nobel Prize in Physiology or Medicine for research on cancer. His claim that a parasite caused stomach cancer was later disproved.
Theodor Boveri : A German biologist who proposed that abnormal chromosome behavior could cause cancer. Boveri offered a competing account of cancer’s origins while Fibiger argued for a parasitic cause.
Spiroptera carcinoma : Fibiger’s proposed cancer caused by the nematode later called Gongylonema neoplasticum. This is the specific disease Fibiger claimed to have induced in rats.
Scientific misconduct : Fabrication, falsification, or other serious breaches of standards in scientific research. Fibiger’s error is often discussed alongside misconduct, though faulty interpretation alone does not establish fraud.
Carcinogenesis : The process by which normal cells acquire malignant properties and form cancer. Fibiger sought to identify a cause of carcinogenesis through animal experiments.
Peyton Rous : An American pathologist who discovered a cancer-causing virus in chickens. Rous’s work established a genuine infectious cause of cancer, unlike Fibiger’s proposed parasite.
Gongylonema neoplasticum : A nematode parasite of rodents and other mammals, formerly called Spiroptera neoplastica. Fibiger associated this parasite with stomach tumors in rats, but it does not cause cancer.
Scientific error : A mistaken claim or conclusion arising in scientific work and subject to correction through evidence. Fibiger’s cancer claim illustrates how an error can persist through persuasive experiments and institutional recognition.
Pathology : The study of disease, including its causes, development, and effects on the body. Fibiger’s career centered on interpreting tissue changes as evidence of disease.
Katsusaburō Yamagiwa : A Japanese pathologist who induced skin cancer in rabbits by repeatedly applying coal tar. Yamagiwa produced experimental evidence for chemical carcinogenesis that challenged Fibiger’s explanation.
Nobel Prize in Physiology or Medicine 1926 : The 1926 Nobel award in physiology or medicine, shared by Johannes Fibiger and not awarded in 1925. The award specifically recognized Fibiger’s research on the alleged parasitic cause of cancer.
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