The study also confirms that TOX, FYB, LEF1, CCR4, ITK, EED, POU2AF, IL26, STAT5, BLK, GTSF1, and PSORS1C2 are genes being differentially expressed between CTCL and benign skin lesions. This evidence concerns the gene GTSF1 and primary cutaneous T-cell non-Hodgkin lymphoma.