neuroendocrine cancer treatmentmalignant neuroendocrine tumormetastatic neuroendocrine tumorneuroendocrine carcinoid tumorneuroendocrine tumor diagnosisneuroendocrine prostate cancerneuroendocrine carcinoma cancergastric neuroendocrine tumorduodenal neuroendocrine tumorneuroendocrine cervical cancerneuroendocrine tumor appendixneuroendocrine breast cancer