SDHB and Uterine leiomyoma: However, the antibody of S-(2-succinyl) cysteine is currently commercially unavailable and cannot be used for clinical diagnosis.[14] SDH, especially SDHB, was applied as a control to verify the results of FH loss.[11] In our case, immunohistochemistry of SDHA and SDHB was performed and was positive, further confirming the characteristics of FH deficiency in cells of uterine leiomyoma.