DRD4 and growth hormone-producing pituitary gland neoplasm: In support of this, we recently evaluated systematically the expression of SSTRs and DRDs in somatotropinomas by qPCR and found an association between the response to SSAs treatment and SSTR2 but also with SSTR1, DRD4 and DRD5 expression.13 However, we did not find here an association between E‐cadherin IHC score and the expression of these receptors.