(B) Quantification of GzmB+ CD4 and CD8 T cells after PMA/ionomycin stimulation and intracellular cytokine staining of cells in the lungs of tumor bearing CCSP-rtTA; TetO-EGFRL858R mice in the absence (−) and presence (+) of erlotinib for 2 weeks. The gene discussed is CD4; the disease is neoplasm.