"We are encouraged by these results which demonstrate that NKTR-102 in combination with the PARP inhibitor rucaparib has a synergistic effect resulting in 100% prolonged survival in a BRCA 1-deficient tumor model," said
NKTR-102 is the first long-acting topoisomerase I inhibitor with an extended half-life and a unique structure that is also designed to concentrate the drug in tumors. In patients, NKTR-102 leads to greatly prolonged plasma SN38 exposure compared to irinotecan (elimination half-life of 50 days compared to 2 days) yet peak SN38 concentrations are at least 5- to 10-times less, which may also result in a favorable tolerability profile.
Preclinical Study Design and Results
Study investigators initiated tumor xenografts with MX-1 human breast carcinomas maintained by serial subcutaneous transplantation in female athymic nude (Crl:NU(Ncr)-Foxn1nu), 8-week-old mice. On the day of tumor implant, each test mouse received a 1-mm3 MX-1 fragment implanted subcutaneously in the right flank. Animals were randomized into treatment groups (n=10/grp) when their tumors reached 63-196 mm3 and subsequently received either vehicle, NKTR-102, rucaparab, or combinations of NKTR-102 + rucaparib. Doses selected were known to provide clinically relevant exposure levels. Twice weekly, animals were weighed, and tumor volumes were measured until the endpoint (2000 mm3 or Day 88) was met. Efficacy was measured by tumor growth delay and regression response rate.
NKTR-102 and rucaparib in combination exhibited marked synergy, demonstrated by durable complete responses, even at the lowest doses of both agents dosed in combination. The combination of NKTR-102 and rucaparib was tolerated at all dose levels. Doses used in this study provide exposures of NKTR-102 (SN38 trough) and rucaparib that are achievable clinically, underscoring the translational relevance of these results.
Combination studies of NKTR-102 and rucaparib are ongoing in patient-derived xenograft models in collaboration with Professor
About NKTR-102
NKTR-102 is currently being evaluated in a Phase 3, open-label, randomized, multicenter study called the BEACON study. BEACON enrolled 852 women with locally recurrent or metastatic breast cancer, who have previously been treated with anthracycline, taxane or capecitabine (ATC), and is being conducted at approximately 150 sites worldwide including
The primary endpoint of the BEACON study is overall survival; secondary endpoints include progression-free survival, objective tumor response rates, clinical benefit rate, duration of response, pharmacokinetics, safety, quality-of-life measurements, and pharmacoeconomic implications. The study is also evaluating specific biomarker data to assess correlation with objective tumor response rates, progression-free survival, overall survival and selected toxicities.
About Nektar
Nektar's technology has enabled nine approved products in the U.S. or
Nektar is headquartered in
MOVANTIKTM is a trademark of the AstraZeneca group of companies.
This press release contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by words such as: "anticipate," "intend," "plan," "expect," "believe," "should," "may," "will" and similar references to future periods. Examples of forward-looking statements include, among others, statements we make regarding the therapeutic potential of etirinotecan pegol (NKTR-102) in combination with the PARP inhibitor rucaparib; and the value and potential of our technology and research and development pipeline. Forward-looking statements are neither historical facts nor assurances of future performance. Instead, they are based only on our current beliefs, expectations and assumptions regarding the future of our business, future plans and strategies, anticipated events and trends, the economy and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict and many of which are outside of our control. Our actual results may differ materially from those indicated in the forward-looking statements. Therefore, you should not rely on any of these forward-looking statements. Important factors that could cause our actual results to differ materially from those indicated in the forward-looking statements include, among others, (i) our drug candidates and those of our collaboration partners are in various stages of clinical development and the risk of failure is high and can unexpectedly occur at any stage prior to regulatory approval for numerous reasons including safety and efficacy findings even after positive findings in previous preclinical and clinical studies; (ii) the timing of the commencement or end of clinical trials and the commercial launch of drug candidates may be delayed or unsuccessful due to regulatory delays, slower than anticipated patient enrollment, manufacturing challenges, changing standards of care, evolving regulatory requirements, clinical trial design, clinical outcomes, competitive factors, or delay or failure in ultimately obtaining regulatory approval in one or more important markets; (iii) acceptance, review and approval decisions for new drug applications by health authorities is an uncertain and evolving process and health authorities retain significant discretion at all stages of the regulatory review and approval decision process; (iv) scientific discovery of new medical breakthroughs is an inherently uncertain process and the future success of the application of our technology platform to potential new drug candidates is therefore highly uncertain and unpredictable and one or more research and development programs could fail; (v) patents may not issue from our patent applications for our drug candidates, patents that have issued may not be enforceable, or additional intellectual property licenses from third parties may be required; and (vi) the outcome of any existing or future intellectual property or other litigation related to our drug candidates and those of our collaboration partners. Other important risks and uncertainties set forth in our Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2014. Any forward-looking statement made by us in this press release is based only on information currently available to us and speaks only as of the date on which it is made. We undertake no obligation to update any forward-looking statement, whether written or oral, that may be made from time to time, whether as a result of new information, future developments or otherwise.
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