Additional file 3: Fig. S1. A, B PCA based on the six pyroptosis-related genes signature. C, D The relationship between the risk score and metastasis. E-G The nomogram calibration curves for predicting 1-, 3-, and 5-year survival in the GSE21257 cohort. H Kaplan–Meier analysis based on the pan-cancer data set and univariate Cox regression analysis of CHMP4C. I The expressions of CHMP4C in tumor and adjacent normal tissues.