SHP-77 epithelial cells are derived from a non-encapsulated primary lung tumor from the apical portion of the upper lobe of the left lung of a 54-year-old, White male in 1977. SHP-77 cells can serve as an in vitro target in 51Cr and 111 in release cytotoxicity assays as well as in vivo nude mice assays for evaluating immune reactivity of cells and serum from lung cancer patients. The cells can be used to evaluate the immune status of patients with SCLC who are treated with radiation or chemotherapy.