SDHB and adrenal gland pheochromocytoma: By contrast, in the original report of germline mutations in non-syndromic PCC from Europe, SDHB mutations were found in 12 of 271 (4.4%) apparently sporadic PPGL (mostly PCC) [2] which is not much different from our study in which 2 out of 32 (6.3%) PCC carry SDHB mutations.