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Title : HIF Repression Cancer Therapy
link : HIF Repression Cancer Therapy

HIF Repression Cancer Therapy

Hypoxia – lack of oxygen – promotes the expression of  hypoxia-inducible factors that mediate cancer progression, including angiogenesis (blood vessel formation) that helps bring oxygen to the tumors.  Blocking those factors is a new form of therapy, described here.  Abstract:

Purpose The von Hippel-Lindau tumor suppressor is inactivated in the majority of clear cell renal cell carcinomas (ccRCCs), leading to inappropriate stabilization of hypoxia-inducible factor-2α (HIF-2α). PT2385 is a first-in-class HIF-2α antagonist. Objectives of this first-in-human study were to characterize the safety, pharmacokinetics, pharmacodynamics, and efficacy, and to identify the recommended phase II dose (RP2D) of PT2385. Patients and Methods Eligible patients had locally advanced or metastatic ccRCC that had progressed during one or more prior regimens that included a vascular endothelial growth factor inhibitor. PT2385 was administered orally at twice-per-day doses of 100 to 1,800 mg, according to a 3 + 3 dose-escalation design, followed by an expansion phase at the RP2D. Results The dose-escalation and expansion phases enrolled 26 and 25 patients, respectively. Patients were heavily pretreated, with a median of four (range, one to seven) prior therapies. No dose-limiting toxicity was observed at any dose. On the basis of safety, pharmacokinetic, and pharmacodynamic profiling, the RP2D was defined as 800 mg twice per day. PT2385 was well tolerated, with anemia (grade 1 to 2, 35%; grade 3, 10%), peripheral edema (grade 1 to 2, 37%; grade 3, 2%), and fatigue (grade 1 to 2, 37%; no grade 3 or 4) being the most common treatment-emergent adverse events. No patients discontinued treatment because of adverse events. Complete response, partial response, and stable disease as best response were achieved by 2%, 12%, and 52% of patients, respectively. At data cutoff, eight patients remained in the study, with 13 patients in the study for ≥ 1 year. Conclusion PT2385 has a favorable safety profile and is active in patients with heavily pretreated ccRCC, validating direct HIF-2α antagonism for the treatment of patients with ccRCC

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