Abstract
Rectal neuroendocrine neoplasms (NENs) are a group of rare and heterogeneous diseases and are classified as well-differentiated neuroendocrine tumors (NETs) and poorly differentiated neuroendocrine carcinomas (NECs) based on histological differentiation. The patients were followed up with a median period of 32.5 (range 2-123) months and no patients were lost to follow-up. The median PFS time could not be obtained, as only less than half of the patients suffered tumor progression by the end of follow-up. The 1-year and 3-year PFS rates were 73.5% and 69.2%, respectively. The median OS was 86 months in the entire cohort. The 1-year and 3-year OS rates were 100% and 96.0%, respectively.
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