neuroendocrine lung carcinomachromogranin lung cancersmall cell neuroendocrine carcinomasmall cell endocrine carcinomalung cancer cell linesneuroendocrine small cell cancerneuroendocrine lung cancermetastatic small cell lung cancersmall cell lung cancer chemotherapysmall cell carcinoma lung cancernon small cell lung cancer metastasisnonsquamous cell lung cancer