COL6A3 and cancer: Survival analyses revealed that the hypermethylation levels of COL6A1/2/3 were risk factors to predict prognosis in most cancer types, but the hypermethylation level was identified as a better prognostic factor for COL6A3 in DLBC and COL6A1 in SARC (Fig. 5C).We further constructed the miRNA-to-gene network of COL6A1/2/3.