I am presently taking therasphere for liver cancer. It involves inserting a catheter into artery next to scrotum and a tube filled with radioactive beads travels up to the liver releasing radiation only on tumors in liver.The problem is to prove I'm still healthy enough to think that way, I masturbated a few times and noticed brownish small discharges also accompanying semen.. I read it might be blood but I don't know and was wondering what happens to the cancer cells once destroyed, how are they expelled from the body and what is the brownish substance ?