CD4 and lung carcinoma: A prospective study examining resected tumors from early‐stage lung cancer patients reported changes in both CD4+ and CD8+ T cells after stereotactic ablative radiotherapy (SABR), with the detectable expression of GATA‐3, T‐bet and ROR‐γt – transcription factors of Th2, Th1 and Th17 CD4+ T cells, respectively, and a reduction in CD4+ Foxp3+ regulatory T cells (Tregs).