Based on previous studies, it appears that a high quantity of FoxP3+ cells in the TME has a positive impact on survival outcomes in certain extranodal TCLs, such as mycosis fungoides (MF), unspecified cutaneous TCLs, and extranodal NK/T lymphomas (ENKTLs) [18,19,20,22]. The gene discussed is FOXP3; the disease is mycosis fungoides.