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July 1984

T Cells and T-Cell Subsets in Mycosis Fungoides and Parapsoriasis: A Study of 18 Cases With Anti-Human T-Cell Monoclonal Antibodies and Histochemical Techniques

Author Affiliations

From the Departments of Dermatology (Drs Buechner and Winkelmann) and Surgical Pathology (Dr Banks), Mayo Clinic and Mayo Foundation, Rochester, Minn. Dr Buechner is a visiting clinician from the Department of Dermatology, University of Basel (Switzerland).

Arch Dermatol. 1984;120(7):897-905. doi:10.1001/archderm.1984.01650430083015

† Skin lesions from 15 patients with mycosis fungoides (MF) and from three with parapsoriasis were studied immunohistochemically with monoclonal antibodies against T cells (Leu 1) and against T-cell subsets (Leu 2a, Leu 3a). Lymphoid cell reactivity was diverse among these sampled cases. In two cases of parapsoriasis and nine of MF, there was a predominance of helper/ inducer (Leu-3a-reactive) cells over suppressor/cytotoxic (Leu-2a-reactive) cells. In one case of parapsoriasis and one (advanced tumor stage) of MF, there was suppressor /cytotoxic cell predominance. One case of MF showed strong reactivity for both T-cell subset markers. Four cases of MF (two plaque-stage and two tumor-stage) featured a predominant cell type in the dermis which was nonreactive for all three antibodies. The intraepidermal lymphoid cellularity was Leu-1-reactive in ten cases of MF and two of parapsoriasis. Among these 12 cases, the intraepidermal cellularity was Leu-2a-reactive in four and Leu-3a-reactive in three. The use of such studies of T-cell subsets on in situ cutaneous lymphoid infiltrates may demonstrate a correlation with cytomorphology, clinical stage, and disease prognosis.

(Arch Dermatol 1984;120:897-905)