Johannes Fibiger

Biography

Johannes Andreas Grib Fibiger, born on April 23, 1867, in Silkeborg, Denmark, became a well-known yet controversial figure in cancer research history. He studied at the University of Copenhagen, later becoming a professor of anatomical pathology. Working at the Institute of Pathological Anatomy, Fibiger combined careful bacteriological and pathological research with experimental approaches that were ahead of his time. He was knowledgeable in anatomy, bacteriology, parasitology, and pathology, gaining recognition as a dedicated scientist eager to uncover the biological causes of disease.

Fibiger's most famous work began in 1907 when he found a type of roundworm in wild rats during his regular pathological studies. He noticed these rats had stomach lesions that looked like cancerous growths and suspected the worms were to blame. After years of research, he claimed in 1913 that he could cause stomach cancer, specifically squamous cell carcinoma, in healthy rats and mice by infecting them with these nematodes, which he called Spiroptera carcinoma. The worms were later correctly named Gongylonema neoplasticum. His findings were acclaimed globally and were hailed as major advancements in experimental medicine since he seemed to show for the first time that a parasite could directly cause cancer.

In 1926, Fibiger received the Nobel Prize in Physiology or Medicine for discovering Spiroptera carcinoma. The Nobel Committee initially refused to award the prize that year, debating whether both Fibiger and Japanese pathologist Katsusaburo Yamagiwa—who induced cancer in rabbits with coal tar in 1915—were not deserving. The next year, the committee gave the 1926 prize to Fibiger. In the same year, he was made a commander of the Order of the Dannebrog and received an honorary doctorate from the University of Paris in 1927, reflecting his high standing in the scientific community.

Fibiger passed away in Copenhagen on January 30, 1928, just months after receiving these honors. After his death, other researchers tried to replicate his results but failed to show that Gongylonema neoplasticum could cause cancer. Later reviews showed that the tumors in Fibiger's rats weren't true cancers but likely caused by vitamin A deficiency in their diet. The stomach lesions he thought were carcinomas were actually non-cancerous growths due to poor nutrition rather than parasitic infection. Fibiger made a genuine mistake rather than intentionally falsifying data, but the impact was significant.

The re-evaluation of Fibiger's Nobel Prize has been critical. In 2010, Erling Norrby, former Permanent Secretary of the Royal Swedish Academy of Sciences, called the prize one of the institution's biggest mistakes. Despite his main scientific claim being overturned, Fibiger's earlier work in bacteriology, especially on diphtheria and its role leading to modern controlled clinical trials, is still seen as an important step forward in medical research.