title: Characteristics of bortezomib- and thalidomide-induced peripheral neuropathy.
abstract: Dose-limiting peripheral neuropathy (PN) is frequently reported with the use of thalidomide and bortezomib, novel proteasome inhibitors. While these two agents have significant activity in multiple myeloma (MM), the combination and the associated PN have not been fully examined in untreated patients. The objective of this study was to report the baseline prevalence and occurrence of PN in newly diagnosed MM patients treated with bortezomib and thalidomide. Twenty-seven patients (11 men and 16 women) with previously untreated MM were prospectively monitored for PN. Total neuropathy score reduced (TNSr) was calculated at baseline and after every two cycles of bortezomib treatment. The median cumulative dose of bortezomib was 35.6 mg/m(2) (median 8 cycles) and of thalidomide was 16.8 g. Only three subjects showed mild PN at baseline (whole group median TNSr 0). At the end of treatment, PN developed in 26 patients (median TNSr 8). PN was of mild to moderate severity (TNSr grade 1 = 11, grade 2 = 10, grade 3 = 5, and grade 4 = 0). Nerve conduction studies showed axonal physiology in all except three subjects in whom demyelinating physiology was noted. The median TNSr was 17 in the demyelinating group and 9 in the axonal group. There was no significant correlation of TNSr with cumulative bortezomib or thalidomide dose. At follow-up, 80% of patients had become asymptomatic after discontinuation of the chemotherapy. We conclude that bortezomib and thalidomide combination chemotherapy induces a reversible length-dependent sensory>motor, predominantly axonal, large-fiber>small-fiber polyneuropathy. In a subset, a more severe demyelinating polyneuropathy may develop.
authors.affiliation: Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA. vchaudh@jhmi.edu
authors.forename: Vinay
authors.initials: V
authors.lastname: Chaudhry
authors.forename: David R
authors.initials: DR
authors.lastname: Cornblath
authors.forename: Michael
authors.initials: M
authors.lastname: Polydefkis
authors.forename: Anna
authors.initials: A
authors.lastname: Ferguson
authors.forename: Ivan
authors.initials: I
authors.lastname: Borrello
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000009:adverse effects*; D001897:Boronic Acids / Q000008:administration & dosage / Q000009:adverse effects*; D000069286:Bortezomib; D004594:Electrophysiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009101:Multiple Myeloma / Q000188:drug therapy; D010523:Peripheral Nervous System Diseases / Q000139:chemically induced* / Q000453:epidemiology; D015995:Prevalence; D011719:Pyrazines / Q000008:administration & dosage / Q000009:adverse effects*; D013792:Thalidomide / Q000008:administration & dosage / Q000009:adverse effects*
chemical_list: D001897:Boronic Acids; D011719:Pyrazines; D013792:Thalidomide; D000069286:Bortezomib