UPDATE 1-ProSieben stands by guidance, sets June launch for streaming venture

ProSiebenSat.1 Media reported a 4 percent gain in first-quarter revenues on Thursday, buoyed by its production and e-commerce divisions, but core profits declined as weak revenues in its legacy commercial TV operation weighed. The German broadcaster had guided for a decline in earnings before interest, taxation, depreciation and amortization (EBITDA), and its reported 5 percent drop just beat expectations in a Reuters pol