@dorenemonchil, I completely understand your confusion. You're asking all the right questions and hopefully you've had a chance to discuss them with your husband's cancer team.

Clear margins in surgery mean that enough healthy tissue surrounding the cancerous tissue or tumor was removed during surgery. This is good news that the tumor was able to be cleanly removed and the cancer cells didn't invade nearby tissues. Think of a ball vs an octupus (an oversimiplified description).

However, cancer cells can also break away and travel to other parts of the body through the blood stream and/or the lymphatic system. It is routine to remove nearby lymph nodes to see if cancer cells are on the move. It sounds like cancer cells were found in the lymph nodes and that to kill the traveling cancer cells immunotherapy is being recommended.

I can't know why your husband's gallbladder was removed. However, sometimes things are not seen on imaging before surgery and only discovered once the surgeon gets in there. This is an excellent question to ask the surgeon and to ask questions about how this will affects your husband's recovery.

How did your appointment go today?