Chemo 20. Psa was up from 2 months ago at 124 to 143 last month and now 163. Scans in 2 weeks. My MO mentioned we will either use my old sample or see if Guardian 360 blood test to look for microsattelite instabilities, which could mean a possible response to Keytruda, I love that my Local is so up to date and caring to look for new treatments for me. Does anyone know of new study on microsattelite instability and Keytruda. Thanks for reading , I am not to worried about where I am, as I have been already been blessed with lot of extra time.