in Estonia) in 1907. Rats having stomach tumour (papilloma) also had nematodes and their eggs. He found that some tumours were metastatic (cancerous). He hypothesised that the nematodes caused the stomach cancer. After years of investigation, he experimentally demonstrated in 1913 that the nematode could induce stomach cancer. He published his discovery in a series of three papers, and also presented them at the Académie Royale des Sciences et des Lettres de Danemark (Royal Danish Academy of Sciences and Letters), and Troisième Conférence Internationale pour l’Étude du Cancer (Third International Conference for Researches in Cancer) at Brussels the same year. He knew that the nematode was a new species, and provisionally named it Spiroptera carcinom in 1914. With Hjalmar Ditlevsen, of the Zoological Museum of the University of Copenhagen, he described it as Spiroptera (Gongylonema) neoplastica in 1914. Ditlevsen revised the description in 1918, and gave the final valid name Gongylonema neoplasticum. But Fibiger never used the formal scientific name, and persistently used Spiroptera carcinoma. Fibiger's experiment was the first to show that helminth parasites can cause cancer, and that cancer (tumour) can be experimentally induced. His discovery was supported by the experiment of two Japanese scientists Katsusaburo Yamagiwa and Koichi Ichikawa in 1918. Yamagiwa and Ichikawa demonstrated the induction of cancer (carcinoma) in rabbits. They showed that it was relatively easy to produce cancer was by painting coal-tar on the inner surface of the ear. A number independent experiments subsequently confirmed the cancer-inducing effect of coal-tar in mice. With such supporting evidence, Fibiger's work was regarded a milestone in cancer study. Personal life Fibiger was married to Mathilde Fibiger (1863–1954). Mathilde was his cousin who came to help her mother's business while he was studying medicine. They got married on 4 August 1894. Fibiger had been suffering from colon cancer, and a month after he received his Nobel Prize, he died of heart attack on 30 January 1928 due to his worsening cancer. He was survived by his wife and two children. Nobel Prize controversy Nomination and selection Fibiger was nominated for the Nobel Prize in Physiology or Medicine 18 times from 1920. In 1926, he received two nominations along with Katsusaburo Yamagiwa. Folke Henschen and Hilding Bergstrand were appointed by the Nobel Committee as assessors. They disagreed on each other's conclusion. Henschen was in favour of the nomination and concluded that "the experimental carcinoma is worthy of the