A case-control study of clinicopathologic features, prognosis, and therapeutic responses in patients with granulomatous mycosis fungoides

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Abstract

Background:

Granulomatous mycosis fungoides (GMF) is an uncommon variant of mycosis fungoides (MF).

Objective:

We sought to analyze the relative frequency, clinicopathologic characteristics, prognosis, and therapeutic responses of GMF.

Methods:

We conducted a retrospective case-control study of patients with GMF and age- and stage-matched patients with classic MF between 1981 and 2012.

Results:

A total of 27 patients with GMF were identified, representing 6.3% of all patients with MF at our center. Skin manifestations were similar to classic MF having an atypical lichenoid CD4+ CD8− lymphocytic infiltrate with interstitial histiocytes and/or perivascular granulomas with giant cells. Fewer patients with GMF achieved a partial response or complete response with topical (57% vs 83%; P = .002) or ultraviolet light (62% vs 90%; P = .006) therapy. The 5- and 10-year progression-free survival rates were significantly lower in patients with GMF (59% and 33%) compared with patients with classic MF (84% and 56%; P = .02), but overall survival was similar between groups (86% and 72% vs 85% and 85%; P = .54).

Limitations:

The retrospective methodology may underestimate the frequency of GMF. The median follow-up time may be too short to detect possible differences in overall survival.

Conclusion:

More frequent disease progression and poorer response to skin-directed therapies were observed in patients with GMF. Our findings may be helpful in selecting the most appropriate treatment for these patients.

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