CD274 and neuroendocrine neoplasm: Programmed death-ligand 1 (PD-L1) expression was related to aggressive behavior in lung tumors (Ghosh et al., 2021; Luo et al., 2021; Zhang et al., 2019) and melanoma (Yu et al., 2016; Kaunitz et al., 2017) and in other systemic neuroendocrine tumors (Rosner et al., 2021; Sampedro-Nunez et al., 2018; Multone et al., 2024).