Two SNPs of GAS5: rs145204276 (Ins/Del) and rs55829688 (T/C) were chosen due to their effects on lung cancer and other neoplasms [15 (link),16 (link),17 (link)]. The genotyping procedure is referred to in our previous research [18 (link)]. The genomic DNA was extracted from leukocytes in venous blood sample via QIAamp DNA kits (Qiagen, Valencia, CA, USA), and all steps with QIAamp DNA kits were in accordance with manufacture’s instruction. The reason we used leukocytes to take genomic DNA is because it is a simple way to obtain human genomic DNA. Isolated DNA was put in one refrigerator under −20 degrees Celsius. The two GAS5 SNPs were examined via the ABI StepOne Real-Time PCR System (Applied Biosystems, Foster City, CA, USA). After that, the polymorphisms of both GAS5 SNPs were analyzed with the assistance of the TaqMan assay technique as well as the SDS version 3.0 software (Applied Biosystems) to enhance Real-Time PCR completeness.
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