This has been similarly reported in another study conducted in Singapore, in which 5 of 7 patients with suspected hereditary PGL/PCC who tested positive carried SDHD (n = 2) or SDHB (n = 3) pathogenic variants, with the remaining two patients harbouring VHL pathogenic variants [21]. This evidence concerns the gene SDHB and adrenal gland pheochromocytoma.