PPP4C and adrenal cortex carcinoma: PPP4C levels had certain diagnostic accuracy in adrenocortical carcinoma (ACC), lymphoid neoplasm diffuse large B-cell lymphoma (DLBC), ESCA, HNSC, KIRC, KIRP, LIHC, lung adenocarcinoma (LUAD), LUSC, prostate adenocarcinoma (PRAD), skin cutaneous melanoma (SKCM), PCPG, THCA, and thymoma (THYM) for tumor diagnoses.