CDKN1A and head and neck cancer: Hence, PHPT1 and CDKN1A were significantly up-regulated at all time points in endometrial patients (Fig 6A and 6C, respectively) while a significant up-regulation in head and neck cancer patients was observed for PHPT1 and CDKN1A only at 48 hr, after the 2nd RT fraction (Fig 7A and 7C, respectively).