Primary pulmonary neuroendocrine neoplasms comprise several distinct entities, corresponding to four main histological subtypes: well-differentiated neuroendocrine tumors, including typical low-grade carcinoids and atypical intermediate grade carcinoids; and small-cell and large-cell neuroendocrine carcinomas of high grade.
There are specific recommendations for the pre-treatment assessment of carcinoid tumors. Clinical suspicion of a secretory syndrome must be confirmed by appropriate biological tests. In the case of metastatic carcinoid tumors, management begins with controlling any carcinoid secretory syndrome using somatostatin analogues. Oncological treatment is based on an assessment of tumor progression, with the possibility of simple monitoring, local treatment of metastases or even the primary tumor, treatment with somatostatin analogues, everolimus, cabozantinib, or, in cases of tumor aggressiveness, chemotherapy, preferably with the combination of oxaliplatin and gemcitabine. Internal radiotherapy vectorized by 177Lu-Dotatate may be offered on a compassionate use basis. In cases of metastatic large cell neuroendocrine carcinoma, the platinum-etoposide combination is typically used as first-line treatment. However, if RB1 expression is preserved or KRAS/STK11 mutations are present, a platinum-gemcitabine or platinumtaxane combination may be proposed.
There is no standard second-line treatment, and the therapies typically used in nonsmall cell lung cancer may be proposed, with the exception of pemetrexed.
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