We found a mutual positive association between TOX and TOX2, TOX and HAVCR2, and TOX2 and HAVCR2 at the transcriptional level in CD3+ tumor-infiltrating T cells (TILs) in single cell (sc)RNA-sequencing of nasopharyngeal carcinoma samples (Supplementary Fig. 1). The gene discussed is TOX2; the disease is neoplasm.