SPP1 and nephrolithiasis: Alternatively, other studies found that ALPL, CYP17, IGF2, EGFR, IL1B, IL6, ITPKC, MTNR1A, OPN, ODC, osteocalcin, RGS14, SAT1, TNFA, TRPV5, and matrix Gla protein gene polymorphisms were not associated with kidney stone recurrence [9, 34, 38–43, 46, 47, 49, 50].