PRESS RELEASE AB SCIENCE WILL HOST A LIVE WEBCAST ON TUESDAY MAY 25, 2021 ON MASITINIB’S RESULTS IN PROSTATE CANCER Paris, May 21, 2021, 6pm CET AB Science SA (Euronext – FR0010557264 – AB) will host a live webcast on May 25, 2021 with key opinion leaders to discuss recently reported results from the Phase 2B/3 masitinib trial in prostate cancer. The webcast call will be held on Tuesday May 25, 2021 from 6.30pm to 7.30pm CET (12.30pm to 1.30pm ET). The webcast will feature presentations by three Key Opinion Leaders: Stéphane Oudard, MD, PhD, Chief of the Oncology Clinical and Translational Research Unit at the Georges Pompidou Hospital in Paris, France