Hi RR - Sorry to hear about your father. I understand why he doesn't want to undergo the highly invasive cystotomy. I don't know how legitimate the products of this company are. In California, all cannabis products have to be tested to verify active ingredients. Assuming they have the active ingredients advertised on the box, I would recommend that your father take as much of the Vijaya as he can on a daily basis, spread out in the morning, afternoon and evening with each meal (cannabinoids are fat soluble). Vijaya has a 1:1 ratio of CBD to THC whereas the Raw Cannabis extract has a 4:1 ratio of CBD to THC. To save yourself money, only buy the Vijaya. After 3 months of taking Vijaya, he should go back to get tested for cancer. Good luck!