S1169 Twelve-Month Interim Analysis of Efficacy and Safety of Givosiran, an Investigational RNAi Therapeutic for Acute Hepatic Porphyria, in the ENVISION Open Label Extension. (October 2020) - Sardh, Eliane; Balwani, Manisha; Rees, David C.; Stein, Penelope; Stölzel, Ulrich; Peiro, Paula Aguilera; Bissell, D. Montgomery; Bonkovsky, Herbert L.; Keel, Sioban; Parker, Charles; Phillips, John D.; Silver, Samuel; et al.