ERVW-1 and malignant colon neoplasm: Spearman correlation between HERV-P, HERV-H, and HERV-K env gene geometric mean transcription levels; HERV-K pol gene geometric mean transcription levels; and HERV-P, HERV-H, and HERV-K LTR methylation levels in surgical specimens (tumor tissue vs. normal tissue in negative resection margins) collected from a cohort of patients with colon cancer.