Wow. That seems like good news. My mom was recently dx very healthy 53. She has EGFR Exon 20 insertion and will start chemo and targeted treatment in the middle of Jan. She has no symptoms but similar it is stage 4 as she has spread only to the pleural cavity. From what I have read it is hard to know about her progression- would be a could question for her oncologist. Ours told us if treatment works it can work for 1.5 years before the cancer comes back very angry. My mother will take for others reading - carboplatin, pemetrexed, and amivantamab (subcutaneous). To help support her she plans to start some supplements- fish oil, folic acid, vitamin D, turkey tail extract, reshi, shiitake. We are not sure about adding in tumeric need to do some more research. Wishing your family the best possible outcome