The genomic DNA of the proband was examined for potential pathogenic germline variants of PCC by next-generation sequencing covering SDHA, SDHB, SDHC, SDHD, SDHAF2, VHL, RET, MAX, TMEM127, FH, NF1, and KIF1B. A germline MAX variant (c.C97T, p.Arg33Ter) was identified and confirmed by Sanger sequencing (Figure 3A). Here, MAX is linked to adrenal gland pheochromocytoma.