PRL and adenoma: There were positive correlations established between the age at diagnosis and baseline PRL (r = 0.207, p = 0.027), and between age and adenoma size (r = 0.191, p = 0.042), the latest being presented in Fig. 2 In addition, baseline serum PRL concentrations were strongly correlated to the tumour dimension (r = 0.830, p = 0.001), as shown in Fig. 3 and 4.