Abstract
Two murine IgG2Ak monoclonal antibodies (703D4, 704A 1) were produced and characterized after immunization with a human large cell lung cancer line (NCI-H 157). These antibodies detect different epitopes on 31 kilodalton [35S]methionine incorporating protein(s). Radiobinding and immunohistochemical studies show these antibodies bind to most (11/13) human non-small cell lung cancer (adenocarcinoma, epidermoid, and large cell), but not to small cell lung cancer (0/11) tumors tested. The epitopes these antibodies recognized are also expressed on human melanomas (7/8), two other tumors (osteogenic sarcoma, renal cell carcinoma), but not on many other human tumors (breast, colon, neuroblastoma, lymphoid), and not on a panel of normal adult human tissues. Because the antigen(s) are preserved after fixation and because of their ability to distinguish lung cancer types from each other and normal tissues, they should be of clinical, as well as of biologic interest.
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