KEY TAKEAWAYS GSK shares in London jumped 5% Thursday after the British pharmaceutical giant said it has resolved most of the U.S. lawsuits it faced around claims that its discontinued heartburn medicine Zantac causes cancer. The London-listed firm said it had struck agreements to resolve 93%, or about 80,000, of the pending Zantac lawsuits in the U.S. and will make a total payment of up to $2.2 billion to settle them. GSK said the plaintiffs are unanimously recommending their clients accept the settlement. ...