Intermittent cyclophosphamide with prednisone versus placebo for polyneuropathy with IgM monoclonal gammopathy.

Abstract:

BACKGROUND:The best treatment for polyneuropathy associated with IgM monoclonal gammopathy (MGUS) is unknown. Oral cyclophosphamide combined with prednisone showed limited efficacy in a previous open label pilot study. We therefore performed a double-blind, randomized, placebo-controlled study of combined oral cyclophosphamide and prednisone in IgM MGUS polyneuropathy. METHODS:Thirty-five patients with progressive IgM MGUS polyneuropathy were included. After stratification for anti-MAG antibodies patients were randomized to oral cyclophosphamide 500 mg once daily for 4 days combined with oral prednisone 60 mg once daily for 5 days (treatment) (n = 16), or placebo (n = 19), repeated every 28 days for six times. Primary outcome was improvement of the Rivermead Mobility Index (RMI). Secondary outcomes were improvement of the modified Rankin scale, Medical Research Council and sensory sum scores, levels of M protein, EMG, and Short Form-36 scale after treatment. Patients were examined at 0, 6, 12, 18, and 24 months. RESULTS:After 6 months of treatment and at later follow-up, no difference in change of the RMI between the two groups was observed. Change of the Rankin scale was similar in both groups. Other outcome parameters showed more improvement in the treatment group: the MRC sum score improved more from 6 to 24 months after treatment; the sensory sum score improved more at 6 months; the SF 36 mean health change score and physical role score improved more; and the median nerve distal conduction (abductor pollicis brevis muscle) improved more in the treatment group. The most common adverse event was nausea. CONCLUSIONS:Compared with placebo treatment, this first double-blind randomized trial with cyclophosphamide and prednisone in IgM MGUS polyneuropathy showed no beneficial effect on the functional scales, but a beneficial effect on muscle strength and sensation was observed.

journal_name

Neurology

journal_title

Neurology

authors

Niermeijer JM,Eurelings M,van der Linden MW,Lokhorst HM,Franssen H,Fischer K,Teunissen LL,van den Berg LH,Schobben F,Wokke JH,Notermans NC

doi

10.1212/01.wnl.0000265055.28218.cc

subject

Has Abstract

pub_date

2007-07-03 00:00:00

pages

50-9

issue

1

eissn

0028-3878

issn

1526-632X

pii

69/1/50

journal_volume

69

pub_type

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