After 6 cycles of chemotherapy, taking into account the different response of visceral masses and skin lesions, a biopsy of a skin nodule was performed: it confirmed that subcutaneous nodules were metastases from the primary small cell neuroendocrine carcinoma with positivity for Synaptophysin and CD56 and negativity for Chromogranin A and CK20. This evidence concerns the gene NCAM1 and small cell carcinoma.