CD4 and squamous cell carcinoma: Exploratory subgroup analysis suggests that all patients benefit from high levels of CD4+ T lymphocytes with respect to TIL location (stromal sites; HR = 0.79; 95% CI, 0.66–0.94), histology subtype (HR = 0.61; 95% CI, 0.38–0.98 for squamous cell carcinoma; and HR = 0.81; 95% CI, 0.67–0.98 for NSCLCs), Asian patients (HR = 0.79; 95% CI, 0.66–0.94), or percentage of positive lymph nodes (<50%; HR = 0.78; 95% CI, 0.66–0.93).