Gls-010, a novel anti-PD-1 mAb in Chinese patients with recurrent or metastatic cervical cancer: Results from a multicenter, open-label and single-arm phase II trial.

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6032 Background: GLS-010 is a novel fully human anti-PD-1 mAb. Previous Phase I study exhibited favorable result of tolerance, preliminary efficacy and 240mg fixed dose q2w was selected as Recommended Phase II Dose (RP2D). This Phase II clinical trial is aimed to further evaluate the safety and anti-tumor activity of GLS-010 in patients with recurrent or metastatic cervical cancer. Methods: PD-L1 positive (combined positive score (CPS) ≥1) patients with recurrent or metastatic cervical cancer who had received one or more lines of chemotherapy were enrolled and received GLS-010 240mg every 2 weeks. Primary endpoint was the objective response rate (ORR) per RECIST 1.1, secondary endpoints included duration of response (DoR) and safety. Results: From May 16th 2019 to December 24th 2019, 44 pts were enrolled and treated in the study. As of December 24th 2019,the median line of prior systemic chemotherapy was 2(range: 1~4), and 59% (26/44) of pts had received ≥2 previous lines of chemotherapy. The median number of GLS-010 doses was 1.5(range: 1~4). 25 pts received response evaluation per investigator review. With a median follow-up of 2.9 months, 7 of 25 evaluable pts achieved a partial response (PR). The ORR was 28% (95% CI, 12.07-49.39), with 7 pts achieving a PR ( 3 of 7 confirmed), 3 pts achieving stable disease (SD) and 15 pts with progressive disease (PD), 1 of which was assessed as dissociated response with treatment ongoing. Median duration of response had not been reached yet. 33 of 44 patients (75%) experienced one or more treatment-related adverse events (TRAEs) per NCI CTCAE v4.03, most of which were grade 1 or 2. The most common TRAEs were Anaemia (15/44), and 73.3% of them were grade 1 or 2. The most common ≥grade 3 TRAE included Anaemia (4/44). As data cut off, only 1 pt discontinued treatment due to adverse event. Conclusions: GLS-010 showed impressive therapeutic activity and manageable safety profile in Chinese recurrent or metastatic cervical cancer patients. Current evidence support further development of GLS-010 in this and more indications. This trial is still ongoing, and we are looking forward to further results. Clinical trial information: NCT03972722.