I started Keytruda in October 2016 as part of a clinical trial at UCSF. The trial combined the Keytruda with 2 cycles of 2 weeks of GM-CSF. I won’t know how well it’s working until my first CT scan at the end of December. As for my CA19-9 levels, they’ve always been within the normal range (like all of my other blood tests). I have seen since my baseline CA19-9 and my most recent test that it did drop from 30 to 24.