ASH Clinical News ACN_5.6_SUPP_DIGITAL_correction_p20 | Page 2

The First and Only Treatment for Blastic Plasmacytoid Dendritic Cell Neoplasm (BPDCN) FROM A DEADLY DISEASE RISES A DURABLE RESPONSE INDICATION • ELZONRIS is a CD123-directed cytotoxin for the treatment of blastic plasmacytoid dendritic cell neoplasm (BPDCN) in adults and in pediatric patients 2 years and older IMPORTANT SAFETY INFORMATION Boxed WARNING: CAPILLARY LEAK SYNDROME • Capillary Leak Syndrome (CLS), which may be life-threatening or fatal, can occur in patients receiving ELZONRIS. Monitor for signs and symptoms of CLS and take actions as recommended WARNINGS AND PRECAUTIONS Capillary Leak Syndrome • ELZONRIS can cause capillary leak syndrome (CLS), which may be life-threatening or fatal if not properly managed. The overall incidence of CLS in clinical trials was 55% in patients receiving ELZONRIS, including 46% in Grades 1 or 2, 6% in Grade 3, 1% in Grade 4, and 2 fatal events. Common signs and symptoms (incidence ≥ 20%) associated with CLS that were reported during treatment with ELZONRIS include hypoalbuminemia, edema, weight gain, and hypotension • Before initiating therapy with ELZONRIS, ensure that the patient has adequate cardiac function and serum albumin is ≥ 3.2 g/dL • During treatment with ELZONRIS, ensure that serum albumin levels are ≥ 3.5 g/dL and have not been reduced by ≥ 0.5 g/dL from the albumin value measured prior to dosing initiation of the current cycle. Monitor serum albumin levels prior to the initiation of each dose or more often as indicated clinically thereafter. Additionally, assess patients for other signs or symptoms of CLS, including weight gain, new onset or worsening edema including pulmonary edema, hypotension, or hemodynamic instability • Counsel patients to seek immediate medical attention should signs or symptoms of CLS occur at any time Copyright 2019 - Stemline Therapeutics, Inc. All rights reserved. 1/2019 US-ELZ-1800028