For the other 12 patients, the mean tumor diameter before bromocriptine was 3.3 ± 1.7 cm (range: 1.5–6.8 cm), the mean cyst diameter was 1.4 ± 1.0 cm (range: 0.4–2.1 cm), and the mean PRL level was 3076.5 ± 2514.7 ng/mL (range: 275.4–8000 ng/mL). This evidence concerns the gene PRL and cyst.