A human lung tumor fetal-associated antigen (LTFA) has been purified from lung tumor tissue by a combination of salt precipitation and Ion-exchange chromatography. The purification steps were monitored by double Immunodiffusion with the use of a rabbit anti-LTFA-ŝpecific antiserum. The Isolated protein was tested for Its blastogenic properties toward peripheral blood lymphocytes (PBL) by [3H]thymldlne Incorporation. PBL obtained from 25 healthy Individuals, 34 patients with tumors other than lung tumors, 13 patients with lung diseases other than lung tumors, and 51 lung tumor-bearing patients were tested. Only PBL with an in vitro positive response to phytohemagglutinin were employed. Whereas PBL of lung tumor patients showed a significant blastogenic response to the purified antigen in 14 of 22 patients tested (60%), PBL of other patients were completely unreactlve (P`0.005). The present data suggested that a specific immune response toward an LTFA was present In patients with lung cancers.
ASJC Scopus subject areas
- Cancer Research