There have been zero studies in humans regarding graviola fruit extract efficacy in the treatment of cancer. There was one study published in 2011 that showed promising results in vitro (i.
e. Plastic dishes) and in vivo (i.e. Mice), but this was a very limited study with a small number of samples. Overall, the data regarding gfe as a cancer treatment
is exceedingly limited.
Answer assisted by Ben Ferguson, Medical Student