Approving a drug based on a theory that it might help is not a good approach. If you're asking for approval to sell a drug to the public you need more than a ho

Approving a drug based on a theory that it might help is not a good approach. If you're asking for approval to sell a drug to the public you need more than a hope. Some degree of solid proof that there are better outcomes with it than without seems a bare minimum threshold and Biogen couldn't clear it.