The company lowered revenue guidance due to COVID-19, but announced a new brand name, Roctavian, for its hemophilia A gene therapy, which it said remains on track for FDA approval later this year. BioMarin Pharmaceutical is still on track to launch the first gene therapy for hemophilia A in the US later this year, but acknowledged during its first quarter sales and earnings call on 29 April that the commercial dynamics are uncertain because of the COVID-19 outbreak. Management unveiled a…