The prognostic value of CpG sites that are negatively correlated with SNHG3, SNHG15, SNHG12 and SNHG17 expression. (A) The correlation between SNHG3 expression and the methylation status of cg07807470 and cg15161854. (B) The correlation between SNHG15 expression and the methylation status of cg00953154, cg03440944 and cg16459265. (C) The correlation between SNHG12 expression and the methylation status of cg03542031, cg07033395, cg12640482, cg15601452, cg19712659 and cg26328951. (D) The correlation between SNHG12 expression and the methylation status of cg04560741, cg13610455 and cg24310959. (E–G) Patients were grouped according to the median cutoff of cg07807470, cg15161854, cg00953154, cg16459265 and cg0703395 methylation status for OS detection. (H–I) Patients were grouped according to the median cutoff of cg07807470, cg15161854 and cg16459265 methylation status for RFS detection.