CAB39 and small cell lung carcinoma: CAB39 autoantibody was also found to be decreased in the BM samples, while its gene was down-regulated in both NSCLC and SCLC samples, as well as in the whole blood sample of NSCLCs, however, high levels of CAB39 protein in LUSC were associated with lower survival rates, indicating that CAB39 has complex roles in tumor regulation.