Recently, Köttgen et al. [14] published the first genome-wide association study (GWAS) on eGFRcrea, eGFR based on cystatin C (eGFRcys), another measure of kidney function, and CKD, reporting significant association with eGFRcrea at three loci (UMOD, SHROOM3 (GeneID: 57619) and GATM-SPATA5L1 (GeneIDs: 2628 and 79029)), with eGFRcys at two loci (CST3-CST9 (GeneIDs: 1471 and 128822) and STC1 (GeneID: 6781)) and with CKD at one locus (UMOD) [14]. This evidence concerns the gene CST9 and chronic kidney disease.