PECAM1 and small cell lung carcinoma: Single-cell copy number alteration (CNA) profiling was performed on 309 cells in total from 14 SCLC patients: 139 CK CTCs, 11 CK|Vim CTCs, 26 CK|Vim|(CD45/CD31) cells, 27 CK|(CD45/CD31) cells, 40 Vim cells, 24 Vim|(CD45/CD31) cells, 14 CK|EpCAM CTCs, and 21 DAPI cells.