IFNG and lip and oral cavity carcinoma: In addition, using reverse transcriptase quantitative PCR (RT-qPCR), we also measured the expression level of 3 cytokine genes (interleukin-10 [IL-10], interferon gamma [IFN-γ], and IL-1-β) in 40 oral cancer tissue samples and 10 precancerous lesion samples that had paired data for microbiome analysis.