In bladder instillation, the prescription medication dimethyl sulfoxide, or DMSO, (Rimso-50) is placed into your bladder through a thin, flexible tube (catheter) inserted through the urethra.

CNN: Interstitial cystitis

As a result, tumours in mice that were fed the extract - dimethyl fumarate (DMF) - were significantly smaller than those in mice given a normal diet.

BBC: NEWS | Health | Food extract boosts cancer drug

It's derived from dimethyl sulfoxide (DMSO), which was promoted as a pain reliever in the 1960s and 1970s until scientists discovered in animal tests that it caused eye damage in high doses.

FORBES: Blue Streak