SSTR2 and neoplasm: Negative correlation between SST2 expression and tumor grading or proliferation rate and a positive association with patient outcomes have been shown (Corleto et al., 2009; Srirajaskanthan et al., 2009; Zamora et al., 2010; Okuwaki et al., 2013; Kaemmerer et al., 2015b; Mehta et al., 2015; Qian et al., 2016; Song et al., 2016; Wang et al., 2017).