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Phase 1/2 Combination Trial of FidnaLux and Semiplimab Begins for Recurrent MSS Colorectal Cancer

ClinicalTrials.govΒ·May 13, 2026
Clinical
Phase 1/2 Combination Trial of FidnaLux and Semiplimab Begins for Recurrent MSS Colorectal Cancer
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Clinical Design and Objectives

This study, conducted in Phase 1/2, evaluates the combination of FidnaLux and Semiplimab in patients with recurrent microsatellite stable (MSS) colorectal cancer (CRC). The primary objectives are to assess safety, determine the optimal dose, and evaluate preliminary efficacy. It aims to explore new therapeutic options for patient populations that have not responded to existing treatments.

Mechanism of Action of FidnaLux

FidnaLux is an anticancer agent that blocks enzymes essential for tumor cell growth. Specifically, it inhibits ribosomal RNA polymerase I (Pol I), thereby suppressing cell proliferation.

Immunopotentiating Effect of Semiplimab

Semiplimab is a monoclonal antibody that blocks the PD-1 protein, helping immune cells recognize cancer cells. As an immune checkpoint inhibitor, it prevents cancer cells from evading the immune system. Therefore, its combination with FidnaLux targets both tumor suppression and immune activation simultaneously.

Potential Impact Upon Success

If safety and efficacy are confirmed, this combination could become a new standard of care for MSS colorectal cancer patients, who currently have limited treatment options. This would broaden therapeutic choices in clinical practice and send a positive signal to the R&D pipelines of related biopharmaceutical companies.

πŸ’¬Why It Matters

This clinical trial opens the door to the commercialization of immune-targeted combination therapies in the large MSS colorectal cancer market, thereby enhancing investment value. It also provides an opportunity to accumulate experience in novel drug development and clinical operations.

Source: ClinicalTrials.gov (api_ct)

https://clinicaltrials.gov/study/NCT07147231