Degron Therapeutics on Thursday padded its series A with a $40-million extension, bringing its total capital raised to $95 million. The financing, led by Lapam Capital, was triggered by the biotech and its molecular glue degrader technology reaching several milestones, CEO Lily Zou told FirstWord. Additional investors in the round include GTJA Investment Group, Fortune Capital, CSPC & Growth, ApicHope, GF Xinde, CASSTAR, Kinghall Ventures and GAGE Capital. Degron's lead candidate, DEG6498, was cleared for clinical testing in advanced solid tumours in the US and China last year, and the first patient was dosed with the Human antigen R (HuR)-targeting degrader in November. Plus, since the company's $22-million series A in 2022, it's added four new programmes to its discovery pipeline: two in the autoimmune disease space, one for a metabolic disease, and a fourth in development for an infectious disease.The breadth of diseases that Degron is attempting to tackle with molecular glues speaks to the capabilities of its de novo degrader discovery platform, dubbed GlueXplorer. Since the company's founding in 2021, GlueXplorer has created more than 10,000 structurally differentiated molecular glue degraders across more than 150 non-IMiDs cores. GlueXplorer boasts a structurally differentiated molecular glue library alongside a body of wet-lab research for Degron's programmes, including proximity, degradation, structural and activity data "that you can't buy or shortcut your way to," Zou said. The company is also building AI tools that learn from its dataset "to help us stay on the cutting edge of molecular glue degrader discovery," she added. But what really sets Degron apart from others in the protein degrader space, Zou said, is the experience the team has gained from discovering and validating each new target, and from advancing its portfolio of programmes."The data is what makes the platform hard to replicate," she explained. "Molecular glue degrader data lives in a fundamentally different chemical and mechanistic space than the inhibitor data big pharma has accumulated over decades — and it's very hard to generate. That's Degron's real moat."GlueXplorer is already attracting interest from big pharma. In 2024, Takeda inked a discovery deal worth up to $1.2 billion with Degron to develop degraders spanning oncology, neuroscience and inflammation.Drugging the undruggable in cancerThe first asset to emerge from GlueXplorer, DEG6498, is also the first HuR-targeting molecular glue to reach the clinic. HuR is an RNA-binding protein that stabilises the mRNAs of many pro-cancer survival genes and is overexpressed across several tumour types. However, its lack of catalytic pocket makes it undruggable with conventional small molecules, and its intracellular location makes it unreachable by antibodies.Degron is the first to open "a route to a target the field has long recognised as important but couldn't drug," Zou said. The company has also generated data showing the importance of HuR in tumour biology. Thanks to a mix of internal research and academic collaborations, Degron discovered that tumours driven by BRAF oncogene mutations require HuR to survive, Zou noted. "In preclinical studies, we demonstrated that cancer cells resistant to current standard-of-care treatments remain sensitive to the HuR degrader, justifying one of our initial patient selection strategies in our clinical trial design," she explained.