In lung cancer sera, 22.4% (21/94) was shown to have autoantibody to PARP1, 4.3% (4/94) was shown to BRCA1, 1.1% (1/94) was shown to BRCA2, 4.3% (4/94) was shown to PARP1 and BRCA1, and 0% (0/94) was shown to PARP1 and BRCA2. Here, PARP1 is linked to lung carcinoma.