Differential methylation at 12 selected HPV16 CpGs in cervical cells from premalignant lesions with biopsy-confirmed diagnoses from our original study (34). Differential methylation at 12 selected HPV16 CpGs in cervical cells from premalignant lesions with biopsy-confirmed diagnoses from our original study (34). The markers indicate cases diagnosed as CIN1 (open triangles), CIN2, or CIN3 (filled circles; A), and CIN2 (filled diamonds) and CIN3 (filled squares; B). A case was counted as methylated if it had any methylation at a given CpG. The methylation difference across the 12 CpGs was significant at P = 0.0007 (A, Mann–Whitney test) and P < 0.0001 (B, Jonckheere–Terpstra test). Janet L. Brandsma et al. Cancer Prev Res 2014;7:526-533 ©2014 by American Association for Cancer Research