Clonal rearrangements of T-cell receptor genes in mycosis fungoides and dermatopathic lymphadenopathy.

Histologic diagnosis of mycosis fungoides may be difficult, especially in lymph nodes that show changes frequently associated with chronic skin disease. As an alternative approach to diagnosis, we have analyzed the configuration of DNA for the beta T-cell receptor genes in biopsy tissues from 14 patients with mycosis fungoides. Clonal rearrangements of these genes were found in each specimen tht contained histologically unambiguous mycosis fungoides. Clonal rearrangements were also found in seven of nine lymph nodes removed from patients with mycosis fungoides and considered histologically to contain only benign lymphadenopathy. Matching rearrangements of beta T-cell receptor genes were detected in benign lymph nodes and histologically involved tissues when paired specimens were available from the same cases. Our findings provide molecular evidence for the clonal T-cell origin of mycosis fungoides and indicate the high incidence of extracutaneous disease in patients with palpable lymphadenopathy. In addition, this study demonstrates that the detection of rearranged T-cell receptor genes can be a sensitive and practical method for the diagnosis and characterization of T-cell neoplasms.

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