Solstice Oncology Launches with $225M Series A for CTLA-4 Antibody
Image
Cambridge, Mass. – September 13, 2026 -- Solstice Oncology has launched with a $225 million Series A financing led by RA Capital Management, with participation from Canaan Partners, Forbion and other investors, to advance a second-generation CTLA-4 antibody into earlier-stage cancer treatment.
Solstice secures $225 million to fund neoadjuvant immuno-oncology program
The clinical-stage company is focused on treating cancer in the neoadjuvant setting, before tumors have hardened resistance to therapy. Its lead candidate, porustobart, is a differentiated, Fc-enhanced CTLA-4 antibody being developed across two clinical indications, including microsatellite-stable (MSS) colon cancer and a second, undisclosed indication.