The Cystic Fibrosis Foundation (CFF) has joined 70 other organizations in signing a letter opposing the latest version of the Right to Try Act, which the House passed recently.

It would allow terminally ill Americans to try medicines that have passed Phase 1 of the US FDA approval process. This means the therapies would continue to be tested in clinical trials, and not yet be on pharmacy shelves.

The legislation was created to expand access to potentially life-saving treatments years before patients would normally have access to them. If passed into law, it would let patients obtain investigational therapies outside of clinical trials without FDA approval.