@janlanderz, I completely agree with @merpreb. These are intelligent questions and you have a right to ask them. There was likely too little time in your originally scheduled appointment. I encourage you to persist. Some of the answers to your questions may lead to new questions. That's okay too. Keep asking. You may also be able to ask a oncology nurse some of the questions.

I, too, would be interested to understand why your case did not initially qualify for immunotherapy and then, after the chemo didn't work, immunotherapy became an option. There can be many reasons for this, which can be complicated. It is a balancing act between population based facts (percentage of people with same tumor type responding positively to specific treatment), drug formularies (which drugs are paid for according to your province), and the individual patient. There is never one size that fits all.