SSTR3 and adenoma: In GH-producing pituitary adenomas, noticeable amounts of SST5 and SST3 are also expressed, besides high levels of SST2 (Lupp et al., 2012; Casar-Borota et al., 2013), whereas in most of ACTH-producing adenomas only SST5 and SST3, but not SST2, were detected (Lupp et al., 2011, 2012).