The computed mean CD4+ TILs/HPFs were as follows—SCLC-A: 1.32 (SD = 2.17); SCLC-N: 0.76 (SD = 0.70); SCLC-P: 1.47 (SD = 1.46); and SCLC-I: 2.7 (SD = 4.15). The gene discussed is CD4; the disease is small cell lung carcinoma.