A patient cohort comprised of 498 patients from the TCGA Research Network. Two Illumina Infinium HumanMethylation450 BeadChip beads (cg12324970 and cg23095743) were used to calculate relative methylation levels of PITX3 by the formula 100 %*bead_M/(bead_M + bead_U). The average value of the ratios of the beads cg12324970 and cg23095743 was calculated. BCR-free survival was considered as the primary endpoint of the study. For PITX2, three Illumina Infinium HumanMethylation450 BeadChip beads (cg10391633, cg01616926, and cg19134945) were analyzed, accordingly.
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