The isolation and modification of genomic DNA was performed using Puregene Blood Core Kit B and EpiTect Bisulfite Kit (QIAGEN, Duesseldorf, Germany) as described previously [15 (link), 16 (link)]. Real-time quantitative methylation-specific PCR (RT-qMSP) was first used to evaluate SLIT2 promoter methylation with AceQ qPCR SYBR Green Master Mix (Vazyme Biotech Co., Piscataway, NJ). The primers for SLIT2 promoter methylation detection were as reported [12 (link)]. Relative SLIT2 promoter methylation was counted using the 2− ∆∆CT formula as referred to ALU methylation.
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