Wasn’t Laetrile apricot based? Seems it went no where after supposed efficacy. I believe Steve McQueen went to Mexico in a last ditched effort for Laetrile treatment. IIRC he had mesothelioma.
Leatrile is found in many plants, but is most concentrated in apricot seeds. I don't see it as a cancer treatment, but probably useful as a prophylactic supplement.