Talk to Hepatologist on Query Regarding The Use Of Immunosuppressants Post Liver Transplant.

My question is from Gastroenterologists, endocrinologists and Hepatologists. It is with regards to my uncle who suffers from Liver Chirrosis causes by Chronic Hepatitis B and is preparing to get a liver transplant. My question is that doctors use immunosuppressive medicines after liver transplant to prevent the rejection of donor organ. I think that has to be taken for ever. It is to prevent the WBCs and immune system from rejecting the organ as a foreign body. But, as you know, weak immune system means more diseases including cancer. Isn't it dangerous? In our pursuit for Liver treatment, Won't we struggle with other diseases caused by a weak immune system? Will appreciate answer from all the experts.

Thanks