Neuroendocrine tumors are a type of cancer that develops in cells of the neuroendocrine system, which is responsible for producing hormones that regulate various bodily functions. These tumors can occur in various organs throughout the body, including the lungs, pancreas, and intestines. Neuroendocrine tumors can be classified as either functioning or non-functioning, depending on whether or not they produce hormones that cause symptoms. Symptoms of functioning neuroendocrine tumors can vary depending on the hormones being overproduced, while non-functioning tumors may not cause any noticeable symptoms until they have grown to a significant size. Diagnosis of neuroendocrine tumors typically involves imaging tests, blood tests to measure hormone levels, and a biopsy to confirm the presence of cancerous cells. Treatment options for neuroendocrine tumors may include surgery, radiation therapy, chemotherapy, and targeted therapy, depending on the size and location of the tumor. Research in the field of neuroendocrine tumors is focused on improving early detection methods, developing more targeted treatments, and understanding the underlying genetic and molecular mechanisms that drive these tumors. By advancing our understanding of neuroendocrine tumors, researchers hope to improve outcomes for patients with this rare type of cancer.