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Objective: To elucidate factors possibly influencing the outcome of colchicine therapy in patients with amyloidosis of familial Mediterranean fever (FMF)., Methods: Retrospective analysis of data abstracted from the charts of all 68 FMF patients with amyloidosis who presented during the study period (1974-1992) with proteinuria (> or = 0.5 gm/24 hours) and creatinine values < or = 2.5 mg/dl, received colchicine, and were followed up for > or = 5 years., Results: At the end of the study period, kidney disease had worsened in 31 patients and remained stable in 22. Proteinuria had regressed in 15 patients. Deterioration was related to initial serum creatinine values > or = 1.5 mg/dl (P < 0.01) and to mean colchicine dosage < or = 1.5 mg/day (P < 0.001). The 3 groups were comparable in terms of initial urinary protein levels, duration of proteinuria, presence of hypertension, occurrence of febrile attacks, sex distribution, and proportion of non-compliant patients., Conclusion: The therapeutic dosage of colchicine for amyloidosis of FMF is > 1.5 mg/day. This dosage is effective only in patients with initial serum creatinine levels < 1.5 mg/dl.

The effect of maternal use of colchicine on fetuses is unknown. The children of 116 women with Familial Mediterranean Fever (225 completed pregnancies) were studied. There was no unusual frequency of fetal abnormality among women taking colchicine before or during pregnancy. Colchicine treatment does not apparently harm mother or child.

Three hundred fifty children (younger than age 16) who had familial Mediterranean fever (FMF) were given continuous prophylactic treatment with colchicine (1-2 mg/day) for 6-13 years. Complete remission of febrile attacks was achieved in 64% of the patients, and partial remission in 31%. Protracted attacks of arthritis virtually disappeared. None of the children developed amyloidosis while on the colchicine regimen. Side effects of colchicine were insignificant, and did not prompt permanent discontinuation of treatment in any of the children. Their growth, development, and subsequent fertility were normal. The efficacy of long-term colchicine treatment of children with FMF makes early diagnosis life saving.