CD4 and non-small cell lung carcinoma: Notably, a significantly higher infiltration of CD4+ memory-activated T cells (P = 0.044) and lower regulatory T cell (Tregs) (P = 0.016) were observed in NTRK MT NSCLC (Fig. 5A), while the rest of infiltrating immune cells were almost equivalent between NTRK MT and NTRK WT NSCLC (Fig. 5A).