This is what I’ve just found:

“A PD-L1 test uses a sample of cancerous tumor tissue to measure how much of a protein called PD-L1 is found on the cancer cells. If you have certain types of cancer, PD-L1 testing can check whether you may benefit from a type of cancer treatment called immunotherapy.”

So it seems that immunotherapy only works if you have/had PD-L1 in your cancer cells?

I don’t know if my husband’s original LC tumor had PD-L1 cells. And altho the mass on his adrenal glad thought to be LC metastasis, the biopsy sample did not report cancerous cells. So I do not know if he qualifies for immunotherapy.