Cystatin C-Based Equations Detect Hidden Kidney Disease and Poor Prognosis in Newly Diagnosed Patients with Multiple Myeloma

Table 2

Chronic kidney disease stage classification of patients with newly diagnosed multiple myeloma depending on the equation employed.

Stage	eGFR (mL/min)	CKD-EPI-sCr-CysC (gold standard)	CKD-EPI-sCr	CKD-EPI-CysC	CAPA
G1	≥90	5	16	4	3
G2	89–60	28	24	22	23
G3a	45–59	9	5	7	9
G3b	30–44	4	5	11	11
G4	15–29	13	9	13	12
G5	<15	2	2	4	3
CKD based on KDIGO guidelines (women/men)	<60	28 (10/18)	21 (6/15)	35 (14/21)	35 (14/21)
CKD based on IMWG guidelines (women/men)	<40	17 (4/13)	16 (3/13)	24 (7/17)	23 (6/17)