<prompt> Following is true about small cell carcinoma of lungs exceptIt is a poorly differentiated neuroendocrine tumorUsually presents as central massCells show salt and pepper chromatin patternLess associated with paraneoplastic syndromes as compared to non small cell lung cancers  <response>: Ans. is d i.e., Less associated with paraneoplastic syndromes as compared to non small cell lung cancers Small cell lung cancer Small cell carcinoma is a poorly differentiated neuroendocrine tumor that tends to occur as a central mass with endobronchial growth and is strongly associated with smoking. Small cell carcinoma cells have scant cytoplasm, small hyperchromatic nuclei with a fine salt and pepper chromatin pattern and prominent nucleoli. Tumors might be arranged in diffuse sheets of cells or may show neuroendocrine patterns such as rosettes, trabeculae, or peripheral palisading of cells at the periphery of nests. There is often widespread cellular necrosis. Small cell carcinomas, more often than non-small cell carcinomas, may produce specific peptide hormones such as adrenocorticotrophic hormone ACTH, arginine vasopressin AVP, atrial natriuretic factor ANF, and gastrin-releasing peptide GRPwith distinctive paraneoplastic syndromes that prompt workup and eventual diagnosis 