STARD13 and avascular necrosis: They studied SNPs in 66 candidate genes and found significant association of AVN with seven SNPs in BMP6, TGFBR2, TGFBR3, EDN1, ERG, KL, ECE1, ANXA2, StAR-related lipid transfer domain containing 13 (STARD13) and PDS5, regulator of cohesion maintenance, homolog B (APRIN) genes.