Hi Peter, Let me say at the beginning that I am fairly new to UT and have no medical qualifications. However in your position I would continue with the UT. I guess that you WILL get extra dose of your medication in the urine, which having been filtered through your body may be more readily absorbed by the tumors on the way through the digestive tract,and may give a more pronounced shrinking effect. However you may have to cut down on the initial dose. This is of course all speculation on my part, but if it was me I would be inclined to experiment along those lines. Good Luck. Love and Light Deotima.