[including breast, lung, colon, ovarian and melanoma, in vitro examination]

Pineapple stem also available in some [most] 
enzyme-supplements and at the moment being seriously examined for its 
effectiveness in such supplements for pancreas cancer.
Very useful as well after all kinds of trauma [in addition to 
arnica..

The origin of many anti-cancer drugs can be found in 
nature 
Dr Julie Sharp

http://news.bbc.co.uk/2/hi/health/4697739.stm