If only bronchopulmonary neuroendocrine tumours were considered, a positive association was detected between GPR68 expression and patient overall survival (rsp = 0.234, p = 0.035) and a negative correlation with levels of the proliferation marker Ki-67 (rsp = –0.222, p = 0.043). This evidence concerns the gene MKI67 and neuroendocrine neoplasm.