Pre- and posttreatment biopsies from 20 lesional skin samples of 18 patients with mycosis fungoides who received either 8 Gy LDRT (<i>n</i> = 16) or topical steroids (<i>n</i> = 4) underwent high-throughput T-cell receptor sequencing of the TCRB gene to quantify the malignant T-cell clone.
Gains of TCRB and TCRG genes were observed in 23% (3 of 13) of SS and 50% (3 of 6) of MFt, reflecting the presence of trisomy and/or tetrasomy of chromosome 7 already detected by conventional cytogenetics and array comparative genetic hybridization techniques.
There is limited information regarding the performance characteristics and utility of TCRG and TCRB clonality assays in diagnosis of MF and ID from paraffin-embedded tissue sections.
We have examined in detail the features of the T-cell receptor beta (TCRB) gene rearrangements in 20 individuals with well-defined stages of cutaneous T-cell lymphoma (CTCL) comprising 10 cases with early-stage mycosis fungoides (MF) and 10 cases with late-stage MF or Sezary syndrome.