title: Monoclonal gammopathy of undetermined significance, smoldering multiple myeloma, and curcumin: a randomized, double-blind placebo-controlled cross-over 4g study and an open-label 8g extension study.
abstract: Monoclonal gammopathy of undetermined significance (MGUS) and smoldering multiple myeloma (SMM) represent useful models for studying multiple myeloma precursor disease, and for developing early intervention strategies. Administering a 4g dose of curcumin, we performed a randomised, double-blind placebo-controlled cross-over study, followed by an open-label extension study using an 8g dose to assess the effect of curcumin on FLC response and bone turnover in patients with MGUS and SMM. 36 patients (19 MGUS and 17 SMM) were randomised into two groups: one received 4g curcumin and the other 4g placebo, crossing over at 3 months. At completion of the 4g arm, all patients were given the option of entering an open-label, 8g dose extension study. Blood and urine samples were collected at specified intervals for specific marker analyses. Group values are expressed as mean ± 1 SD. Data from different time intervals within groups were compared using Student's paired t-test. 25 patients completed the 4g cross-over study and 18 the 8g extension study. Curcumin therapy decreased the free light-chain ratio (rFLC), reduced the difference between clonal and nonclonal light-chain (dFLC) and involved free light-chain (iFLC). uDPYD, a marker of bone resorption, decreased in the curcumin arm and increased on the placebo arm. Serum creatinine levels tended to diminish on curcumin therapy. These findings suggest that curcumin might have the potential to slow the disease process in patients with MGUS and SMM.
authors.affiliation: Department of Endocrinology, St George Hospital, Sydney, Australia. terry.golombick@sesiahs.health.nsw.gov.au
authors.forename: Terry
authors.initials: T
authors.lastname: Golombick
authors.forename: Terrence H
authors.initials: TH
authors.lastname: Diamond
authors.forename: Arumugam
authors.initials: A
authors.lastname: Manoharan
authors.forename: Rajeev
authors.initials: R
authors.lastname: Ramakrishna
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000596:Amino Acids / Q000652:urine; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000627:therapeutic use*; D015415:Biomarkers; D016723:Bone Remodeling / Q000187:drug effects; D003404:Creatinine / Q000097:blood; D018592:Cross-Over Studies; D003474:Curcumin / Q000008:administration & dosage / Q000627:therapeutic use*; D018450:Disease Progression; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007147:Immunoglobulin Light Chains / Q000032:analysis; D008297:Male; D008875:Middle Aged; D008998:Monoclonal Gammopathy of Undetermined Significance / Q000097:blood / Q000188:drug therapy* / Q000652:urine; D009101:Multiple Myeloma / Q000517:prevention & control*; D009194:Myeloma Proteins / Q000032:analysis; D010281:Parathyroid Hormone / Q000097:blood; D016896:Treatment Outcome; D014807:Vitamin D / Q000097:blood
chemical_list: D000596:Amino Acids; D000972:Antineoplastic Agents, Phytogenic; D015415:Biomarkers; D007147:Immunoglobulin Light Chains; D009194:Myeloma Proteins; D010281:Parathyroid Hormone; D014807:Vitamin D; C036020:deoxypyridinoline; D003404:Creatinine; D003474:Curcumin