CHGA and small cell lung carcinoma: Expression of typical SCLC markers synaptophysin (SYP), enolase-2 (ENO2) and chromogranin A (CHGA) of the CTC lines BHGc7, 10, 16, 26 and UHGc5 were tested in RT-qPCR relatively to RNA from normal lung tissue (Fig. 1).