TBX21 and neoplasm: Figure S2. Conventional (Tbet–) and Tbet+Foxp3+ Tregs can be found in tumor and stroma of OPSCC samples. Figure S3. The correlation between the number of CD8–Foxp3 + Tbet+ Tregs and CD8–Foxp3–Tbet+ (CD4) T cells and CD8 + Foxp3–Tbet+ T cells is retained in IR- and IR+ OPSCC tumors.