 Pharmaceutical giants GSK PLC LSE:GSK, NYSE:GSK GSK.L, Pfizer Inc NYSE:PFE PFE.N, Sanofi SA SASY.PA and Boehringer Ingelheim received a boost today as a US court ruled that claims the heartburn drug Zantac caused cancer were not supported by scientific evidence. Broker UBS said the ruling in the multi-district litigation MDL by US district judge Robin Rosenberg removed around 2,000 cases that had been filed in the MDL but as there had been a time limit for cases to be brought, could affect 70,000 cases in total. 