KEYNOTE-412 ctDNA: clearance after 5wk CRT was more frequent w/ pembro, but outcome associations varied by HPV status and arm. Interesting biomarker work. Without an interaction test, I wouldn't call this predictive of pembro benefit. #ESMO26 #radonc https://t.co/HAS3ZYi4lX https://t.co/7rlojMGpuJ