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- W4365513062 abstract "Abstract Background: The dysregulation of polycomb repressive complex 2 (PRC2) promotes tumorigenesis and progression. Two therapeutic agents targeting enhancer of zeste homolog (EZH) 2 or EZH1/2, the catalytic subunits of PRC2, have been approved in several cancer types. HH2853 is a novel selective EZH1/2 dual inhibitor, which has demonstrated superior anti-tumor efficacy to tazemetostat (EZH2 inhibitor approved by FDA) in various preclinical models. Methods: This is a first-in-human, open-label, multi-center, phase (Ph) I/II study of HH2853 in patients (pts) with relapsed/refractory (r/r) non-Hodgkin lymphomas (NHLs) or advanced solid tumors. HH2853 was administered orally twice daily (BID) on a continuous 28-day treatment cycle. Ph I consist of two parts: dose escalation part adopting accelerated titration followed by a Bayesian optimal interval design and dose extension part. Dose limiting toxicity (DLT) was evaluated during the 1st cycle in dose escalation. Safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD) and preliminary anti-tumor activity of HH2853 were explored in this Ph I study. Results: As of Oct 19, 2022, a total of 57 pts, including 50 pts with solid tumors and 7 pts with r/r follicular lymphoma (FL), were enrolled from 12 sites in China and the US. Twenty-five (43.9%) pts received ≥3 lines of prior systemic therapies. Six dose levels(50 mg, 100 mg, 200 mg, 400 mg, 600 mg and 800 mg)were evaluated. DLTs were observed in 2 of 8 DLT evaluable pts at 800 mg: one grade 3 platelet count decreased and one grade 3 diarrhea. A conclusive maximal tolerated dose was not reached. The most common treatment-related adverse events (TRAE) were diarrhea (45.6%), blood bilirubin increased (35.1%), white blood cell count (WBC) decreased (26.3%), platelet count decreased (26.3%), rash (24.6%) and anemia (22.8%). The most common ≥grade 3 TRAEs included anemia (8.8%), platelet count decreased (7.0%), WBC decreased (5.3%) and diarrhea (5.3%). TRAEs leading to dose interruption or reduction were reported in 17.5% and 8.8% pts respectively. No TRAE led to dose discontinuation or death. PK data indicated dose-related increase in exposure from 50 to 600 mg. PD data showed a significant inhibition (maximum reached >90%) of H3K27me3 in granulocytes and monocytes at 400-800 mg. Tumor responses were observed in 7 pts from 200 to 800 mg in multiple tumor types, including complete response in 1 patient with FL, partial response in 3 pts with epithelioid sarcoma, 2 pts with FL and 1 patient with malignant rhabdoid tumor of pancreas. Conclusions: This first-in-human study of HH2853 showed a manageable safety profile and promising anti-tumor activity in multiple tumor types, supporting further exploration in NHLs and solid tumors after recommended Ph II dose is determined.Clinical trial information: NCT04390737 Citation Format: Zhengfu Fan, Jin Wang, Meiyu Fang, Johnston Patrick, Tun Han, David Sommerhalder, Jifang Gong, Jilong Yang, Yun Yang, Javier Munoz, Yuqin Song, Zhiming Li, Xian'an Li, Qiuying Ma, Jinming Han, Lin Shen, Jun Zhu. Preliminary results from the Phase I part of a first-in-human Phase I/II study of HH2853, an EZH1/2 inhibitor, in patients with relapsed/refractory non-Hodgkin lymphomas or advanced solid tumors [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 2 (Clinical Trials and Late-Breaking Research); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(8_Suppl):Abstract nr CT105." @default.
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- W4365513062 title "Abstract CT105: Preliminary results from the Phase I part of a first-in-human Phase I/II study of HH2853, an EZH1/2 inhibitor, in patients with relapsed/refractory non-Hodgkin lymphomas or advanced solid tumors" @default.
- W4365513062 doi "https://doi.org/10.1158/1538-7445.am2023-ct105" @default.
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