This cell line is aneuploid, will form colonies in soft agar and retains small cell carcinoma morphology and ultrastructure as well as APUD cell characteristics. The cells grow in aggregates, thus cell counts are not accurate.The cells stain positively for cytokeratins. The line can be adapted to grow in shaker flask or spinner flask systems. The N-myc gene is amplified, and there is expression of the mRNA and protein.C-myc mRNA, but not protein, is expressed at a low level.There is expression of c-myb, v-fes, v-fms, c-raf 1, Ha-ras, Ki-ras and N-ras mRNA.