Quantitative methylation-specific PCR for the detection of aberrant DNA methylation in liquid-based Pap tests

Cancer
Steven L KahnKaren S Gustafson

Abstract

Aberrant promoter methylation of selective tumor suppressor genes has been detected in squamous intraepithelial lesions (SIL) and invasive cervical cancer. Identification of methylation profiles of genes that can distinguish high-grade SIL (HSIL) from low-grade SIL (LSIL), and cytologically negative for intraepithelial lesion or malignancy (NILM) residual liquid-based Papanicolaou (Pap) tests may be potentially useful as an ancillary test for cervical cancer screening. Using real-time quantitative methylation-specific polymerase chain reaction (PCR) (QMSP), the authors analyzed the frequency and relative level of promoter methylation for DAPK1, IGSF4, SPARC, and TFPI2 in biopsy-confirmed HSIL and LSIL, and NILM residual liquid-based Pap tests. The percentage of methylation (%M) for each gene was calculated using the reference gene, ACTB. The cumulative methylation score for each sample, defined as the sum of %M of all 4 genes, was used to analyze the genes in combination. For each gene analyzed the frequency and relative level of methylation were increased in HSIL compared with combined NILM/LSIL samples. The cumulative methylation scores were significantly higher in HSIL samples (P < .0001). Area under the receiver operating c...Continue Reading

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