Hence, the concentration of PD-L1 (L) is proportional to (T1 + T8) and C:L=ρL(T1+T8+εC),(13)where ρL is the ratio of the mass of all the PD-L1 proteins in one T cell to the mass of one T cell, and ε depends on the specific type of tumor. The gene discussed is CD274; the disease is neoplasm.