 BBC News | Roche Aims to Buy Rest of Genentech for $43.7 Billion (Update3) Bloomberg - By Dermot Doherty July 21 (Bloomberg) -- Roche Holding AG, Switzerland's largest drugmaker, offered to buy the rest of Genentech Inc. for $43.7 billion to gain the largest US maker of cancer medicines. Roche to buy the rest of Genentech for $43.7B; profit slips Roche sees substantial synergies in Genentech deal |