The efficacy and toxicity of a constant low dose of methotrexate as a treatment for intractable rheumatoid arthritis: an open prospective study.
Ninety-two patients with intractable rheumatoid arthritis (RA) participated in an open prospective study of the longterm efficacy and toxicity of methotrexate (MTX), administered orally at a constant dosage of 7.5 mg/week. Twenty-four patients (25%) had to be withdrawn from the study within the first 12 months because of inefficacy or adverse reactions with a fatal outcome in 2 patients. In the remaining 68 patients, the mean duration of therapy was 19 months. Sixty-three of 92 patients (68%) experienced significant clinical improvement after one year, 23 (25%) were in clinical remission. Twenty-three of these patients initially responded well but relapsed after a median of 15 months of therapy. In 5 patients (5%) the disease activity remained status quo. Toxicity was noted at some time in 51 patients (54%), consisting of clinical side effects in 37 patients (40%) and biological abnormalities in 36 patients (39%), including 9 patients (10%) with blood and bone marrow toxicity, in whom renal function at start was normal. Two of these latter 9 patients had a fatal outcome because of an unexpected renal deterioration due to intercurrent disease. Thus, MTX at this constant low dose appears to be a temporarily valuable therapy for intractable RA. Careful monitoring is necessary in view of the potentially dangerous side effects.
Mielants
H
H
Department of Rheumatology, University of Ghent, Belgium.
Veys
E M
EM
Van der Straeten
C
C
Ackerman
C
C
Goemaere
S
S
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001172:Arthritis, Rheumatoid / Q000188:drug therapy* / Q000503:physiopathology; D001799:Blood Sedimentation; D001855:Bone Marrow Diseases / Q000139:chemically induced / Q000401:mortality; D002097:C-Reactive Protein / Q000032:analysis; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D005260:Female; D006402:Hematologic Diseases / Q000139:chemically induced; D006801:Humans; D007676:Kidney Failure, Chronic / Q000139:chemically induced; D008099:Liver / Q000187:drug effects; D008297:Male; D008727:Methotrexate / Q000008:administration & dosage* / Q000009:adverse effects / Q000627:therapeutic use; D008875:Middle Aged; D011446:Prospective Studies
D002097:C-Reactive Protein; D008727:Methotrexate