From all model parameters, we singled out those assumed decisive in determining the patient response, namely, the cancer cell replication rate—pC, the baseline elimination of cancer cells due to effector CD8+ T cells—kE0, the tumor immunogenicity—ρD, the reinforcing effects of the tumor on effector memory and on effector T cells—kC03,kC04, respectively. This evidence concerns the gene CD8A and neoplasm.