Exhibit 99.1 Geron Corporation Reports Second Quarter 2025 Financial Results and Recent Business Highlights "We are pleased that our sharpened sales strategy is demonstrating signs of commercial success as evidenced by solid U.S. sales and increased demand across a broadening group of treating physicians," said Dawn Carter Bir, Interim President and Chief Executive Officer of Geron. "Last quarter, we set out to increase our commercial sales team by 20% and double our medical science liaisons and I'm pleased ...