Hello, sorry to hear the state of your patient. This proves human limitations in front of the super power-creator of the universe. leaking foul discharge from the rectum is actually the tumor. When the cells outgrow their blood supply, they are shed away. Along with it there is an added infection which makes it foul smelly. I would recommend a mild enema to be inserted atleast thrice a week to clear alk the dirt. A proctoclysis or plain warm water with 10ml betadine solution can also be used as an enema. The metronidazole injection, which comes as a 100ml bottle, can be inserted into the rectum using an I.V.set. 25ml thrice a day and allowed it to be retained inside the rectum this will clean all the infection and the sloughed cancer cells along with the sticky mucus. take care.