Baker Brothers Make $1.4 Billion in Two Weeks on Biotech(Bloomberg) Even in the volatile world of biotech,Baker Bros. Advisorshas notched some extraordinary returns in the past two weeks. On October 21, Seattle Genetics Inc. added $2.1 billion to its market capitalization after a study showed one of its therapies slowed the spread of breast cancer, including for patients whose disease had metastasized to the brain. Then on Friday in Hong Kong, BeiGene Ltd. gained 32% after Amgen Inc. said it would take a $2.7 billion minority stake in the Chinese-American drug developer.