@lls8000
They actually did do the biomarker test at the end of February. We got the results close to the end of March. The tumor in the lung matched the blood markers.
And yes, since I posted the question, they did do the MRI. Turns out he has a tumor on his brain which was inflamed. Thank God that it hadn't ruptured. They admitted him to the hospital, hit him with high doses of steroids and reduced the inflammation and pressure. He can now lift his arm from the shoulder, Not very much, but it's a start. He still doesn't have use of his lower arm, hand or fingers yet.
He will see a radiation doctor on Wednesday and see about treating it with radiation. He also said his vision was somewhat better after the steroid treatment which he continues at home.
As for me, I'm doing good. More questions than answers at the moment.
Also... Incase anyone out there doesn't know this (as we just found out) a PET scan Does Not show cancer in the Brain! The radiation in the infusion lights up the brain which prevents them from seeing the tumors. They have to do a MRI with and without contrast to detect tumors in the brain. This information came from our neurosurgeon!!!