You have to be very careful with claims concerning cancer. The organic, sustainably harvested seaweeds used in this product have been selected based on the results of the studies we cite below. Each of them have been shown to be anti-tumour / anti-cancer in a range of clinical animal studies, largely rats. We absolutely cannot make any claims after this. We let the science speak for itself and sincerely hope it will help. There are no known drug clashes so far for AC4 and, in our opinion, could be used alongside any recommended conventional treatments but please consult with a good vet first.