This study is for patients with neuroendocrine carcinoma (NEC) originating outside of the lung. This study is being done to see if the combination of atezolizumab, an immunotherapy drug, with a platinum drug (cisplatin or carboplatin) and etoposide better or worse than a platinum drug and etoposide for patients with advance or metastatic neuroendocrine carcinoma originating outside the lung

This study is for patients receiving oxaliplatin for their cancer treatment. The study is being done to see if duloxetine (either 30 mg or 60 mg) prevents numbness, tingling, and/or pain caused by your cancer treatment with oxaliplatin. The study is being done to see if duloxetine can prevent OIPN (oxaliplatin-induced peripheral neuropathy).