OBJECTIVETo screen serum peptide associated with renal impairment in patients with multiple myeloma(MM) and search early biomarker of MM renal impairment.

METHODSThe weak cation exchange magnetic bead combined with matrix assisted laser desorption/ionization time of flight mass spectrometry was used to compare and analyze serum peptidome of MM with or without renal impairment.

RESULTSThere were 18 peptide peaks with statistical significance in the molecular weight range from 700 to 10 000 Da(P<0.05), among them 7 peptides were upregulated and 11 were downregulated. The Quick Classifier diagnostic model composed of 3 peptides, which can strongly distinguish MM patients with or without renal impairment by means of Embedded Software. Its sensitivity and specificity were 97.14% and 94.12%, respectively. Peptides with molecular weight of 3908.85 Da and 3216.06 Da were significantly upregulated in MM patients with renal impairment, while the peptide with molecular weight of 2990.08 Da was significantly downregulated in MM patients with renal impairment.

CONCLUSIONPeptides associated with MM renal impairment obtained by serum peptidome technology can provide a new clue for early assessment and diagnosis of clinical MM renal impairment.