Fig. 4From: Disease burden in patients with acute hepatic porphyria: experience from the phase 3 ENVISION studyAttack frequency (A), proportion of attack-free patients by 3-month interval (B), and hemin use (C) with long-term givosiran treatment in patients with or without prior hemin prophylaxis usea. aHemin prophylaxis was not allowed during the study; days of hemin use therefore refers only to hemin used to treat attacksBack to article page