Mabwell presented the clinical study data of the 9MW2821 for patients with cervical cancer as focused plenary oral presentation at the Society of Gynecologic Oncology (SGO) annual meeting on March 16, 2024. The data showed good efficacy and safety of 9MW2821 in patients with cervical cancer, which is expected to bring new breakthroughs for the treatment of recurrent or metastatic cervical cancer, meeting a large number of unmet clinical needs. 9MW2821 is the first drug to report clinical data for the indication of cervical cancer among the drugs with the same target in the world.

This phase I/II, multicenter, open-label, clinical study was led by Professor Zhang Jian of Fudan University Shanghai Cancer Center, and Professor Yang Huijuan of Fudan University Shanghai Cancer Center represented the study team to give an in-depth report at the meeting. The study results were highly recognized by experts on site. Further clinical study data are expected to provide more treatment options for patients with recurrent or metastatic cervical cancer.

The systemic treatment drug options and efficacy for recurrent or metastatic cervical cancer are relatively limited. The cervical cancer cohort in the phase I/II study of 9MW2821 enrolled patients with Nectin-4-positive recurrent or metastatic cervical cancer who had progressed on or after doublet platinum-containing chemotherapy with or without bevacizumab and received no more than two previous systemic regimens for recurrent or metastatic disease. Eligible patients received intravenous 9MW2821 1.25mg/kg on days 1, 8 and 15 of each 28-day cycle until confirmed disease progression, death, intolerable adverse effects or withdrawal from the study.

As of September 25, 2023, in the cervical cancer expansion cohort of the study, the detection rate of Nectin-4 expression was 89.67%, and the rate of Nectin-4 IHC 3+ was 67.82%. A total of 40 patients were enrolled in the study, 57.5% of the patients had previously received platinum-based doublet chemotherapy combined with bevacizumab, and 60% of the patients had previously received platinum-based doublet chemotherapy and immune checkpoint inhibitor therapy. In terms of efficacy, the overall response rate (ORR) and disease control rate (DCR) of 37 patients evaluable for efficacy were 40.54% and 89.19%, respectively, with one complete response (2.70%) and 14 partial responses (37.84%).

Median progression-free survival (PFS), overall survival (OS), and duration of response (DOR) were not reached yet. Among patients with Nectin-4 IHC 3+, the ORR and DCR of 26 patients evaluable for efficacy were 50.00% and 92.31%, respectively. Among patients on or after doublet platinum-containing chemotherapy, the ORR and DCR of 21 patients evaluable for efficacy were 38.10% and 85.71%, respectively.

In terms of safety, treatment-related adverse events (TRAEs) occurred in 92.50% of participants. Grade3-4 TRAEs occurred in 70.00% of participants, with neutropenia (40.00%), rash (17.50%) and gamma-glutamyl transferase increased (12.50%) being the most frequently reported. Nodeaths related to treatment were reported.

The above study results indicate that 9MW2821 has controllable safety and positive efficacy in patients with cervical cancer.