Clin Cancer Res 2020 Sep 1
Immunotherapy of Ipilimumab and Nivolumab in Patients with Advanced Neuroendocrine Tumors: A Subgroup Analysis of the CA209-538 Clinical Trial for Rare Cancers.   

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Biopsy of other sites is more consistent with carcinoid tumor.

For this example, Ki-67 of 80, MSS, low TMB