TIL a man from Colombia developed non-human cancer from a tape worm living inside him. User edgar_allan_h0e_, in the Today I Learned (TIL) subreddit, 22 Jul 2021
Malignant Transformation of Hymenolepis nana in a Human Host User alandrya, in the Microbiology subreddit, 12 Dec 2020
Apparently you can get cancer from tapeworms: User misteratoz, in the /r/medicine: a subreddit for medical professionals subreddit, 01 Feb 2019
TIL that a colombian man with a badly treated HIV infection was hospitalized and diagnosed with dwarf tapeworms, as well as several tumors of unknown origin in his lungs, liver and lymph nodes. After his death it was found out that the tumorcells originated from one of the tapeworms in his body. User marysneighbourhood, in the Today I Learned (TIL) subreddit, 10 Sep 2016
Malignant Transformation of Hymenolepis nana in a Human Host User Henipah, in the Free Open Access Medical Education subreddit, 02 Jan 2016
Yikes: If a tapeworm in a human gut contracts cancer, it can be transmitted to the host. User DamnInteresting, in the Damn Interesting subreddit, 20 Nov 2015