This study analyzed the expression of PPM1M copy number variants in different types of tumors, as shown in Figure 3C, which was positively correlated with PPM1M copy number in UCS, KIRP, and LGG, but negatively correlated with PPM1M copy number in BRCA, OV, COAD, LIHC, pheochromocytoma, paraganglioma (PCPG), and THCA. Here, PPM1M is linked to pheochromocytoma.