@birdman518 i understand that you’re worried about side effects, aren’t we all. Most of the side effects listed are pretty rare. The drug companies have to list every side effect no matter how rare. Common side effects usually resolve as your body adjusts. When i was diagnosed with lesions on my brain, my first thoughts were very negative. I just didn’t want to go through treatment. But, now 3 years later (and still receiving treatment), i have no regrets.
If you decline the immunotherapy, any microscopic cancer cell will continue to grow. The cells can migrate to anywhere in the body and make diagnosis and treatment difficult. If the surgeon says that any lymph nodes were positive, then they might do a PET scan to see if the cells have spread (metastasis).
Have you spoken to the doctors about your concern over side effects?