Athenex Announces Oral Paclitaxel and Encequidar had a Significantly Higher Response Rate Over IV Paclitaxel in a Phase III Pivotal Study in Metastatic Breast Cancer
- Study met primary endpoint showing statistically significant improvement in overall response rate for oral paclitaxel and encequidar (Oral Paclitaxel) compared to IV paclitaxel based on intention-to-treat (ITT) analysis
- Strong trend in progression-free survival (PFS) and overall survival (OS) of Oral Paclitaxel compared to IV paclitaxel
- Proportion of confirmed responders with duration of response >150 days was 2.5 times higher for Oral Paclitaxel than IV paclitaxel
- Neuropathy was less frequent with Oral Paclitaxel compared to IV paclitaxel
Plan to request a pre-NDA meeting as soon as possible and present data at a major upcoming scientific meeting
ATNX to discuss the results on the earnings conference call today at
A total of 402 typical metastatic breast cancer patients were enrolled in a 2 to 1 ratio of Oral Paclitaxel to IV paclitaxel in the ITT population (265 in the Oral Paclitaxel group versus 137 in the IV paclitaxel group). Patient demographics were balanced in the two treatment groups. The primary efficacy endpoint was overall tumor response rate (ORR) confirmed at two consecutive timepoints using RECIST v1.1 criteria. Blinded assessments of tumor response were made by two independent radiologists and an independent adjudicator, using a computer algorithm to assign responses.
Oral Paclitaxel showed a statistically significant improvement compared to IV paclitaxel on the primary efficacy endpoint, with an ORR of 36% for the Oral Paclitaxel group compared to 24% for IV paclitaxel patients based on ITT analysis (p = 0.01). Oral Paclitaxel also showed statistically significant improvement compared to IV paclitaxel based on other analyses on populations excluding non-evaluable patients (which would give higher response rates), with p-values ≤ 0.01 in all analyses. In addition, the results showed that the proportion of confirmed responders with a duration of response of more than 150 days was 2.5 times higher in the Oral Paclitaxel group than in the IV paclitaxel group.
Based on the data cut-off on
In the study, the Oral Paclitaxel group had lower incidence and severity of neuropathy compared to IV paclitaxel: 57% of IV paclitaxel patients experienced neuropathy (all grades) versus 17% of Oral Paclitaxel patients, with grade 3 neuropathy observed in 8% of IV paclitaxel patients versus 1% of Oral Paclitaxel patients. The results also showed lower incidence of alopecia, arthralgia and myalgia in the Oral Paclitaxel group. The incidence of neutropenia was similar in both groups, but there were more incidents of grade 4 neutropenia and infection in the Oral Paclitaxel group. There were also more gastro-intestinal side effects in the Oral Paclitaxel group.
“We believe the success of the Oral Paclitaxel program serves as a validation for our Orascovery technology platform, which also includes the oral delivery of docetaxel, cabazitaxel, irinotecan, topotecan and eribulin,” continued Dr. Lau. “Athenex is transforming from a clinical stage company into a fully integrated company with late-stage oncology product candidates and capabilities across the pharmaceutical value chain, including manufacturing and marketing.”
The Orascovery platform was initially developed by
About the Phase III Study of Oral Paclitaxel and Encequidar
The Phase III pivotal study is a randomized, controlled clinical trial designed to compare the the safety and efficacy of Oral Paclitaxel monotherapy against intravenous paclitaxel monotherapy in patients with metastatic breast cancer. The primary endpoint was tumor response rate (confirmed by scans at two consecutive timepoints) as assessed by RECIST v1.1 criteria, a generally accepted method for assessing tumor response. Blinded assessments of tumor response are made by two independent radiologists and an independent adjudicator, using a computer algorithm to assign responses.
Conference Call and Webcast Information
Company management will discuss the Phase III results during its quarterly earnings conference call, today,
About Athenex, Inc.
Founded in 2003, Athenex, Inc. is a global clinical stage biopharmaceutical company dedicated to becoming a leader in the discovery, development and commercialization of next generation drugs for the treatment of cancer. Athenex is organized around three platforms, including an Oncology Innovation Platform, a Commercial Platform and a Global Supply Chain Platform. The Company’s current clinical pipeline is derived from four different platform technologies: (1) Orascovery, based on non-absorbed P-glycoprotein inhibitor, (2) Src kinase inhibition, (3) T-cell receptor-engineered T-cells (TCR-T), and (4) Arginine deprivation therapy. Athenex’s employees worldwide are dedicated to improving the lives of cancer patients by creating more active and tolerable treatments. Athenex has offices in Buffalo and Clarence, New York; Cranford, New Jersey; Houston, Texas; Chicago, Illinois; Hong Kong; Taipei, Taiwan; multiple locations in Chongqing, China; and
Except for historical information, all of the statements, expectations, and assumptions contained in this press release are forward-looking statements. These forward-looking statements are typically identified by terms such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “evaluate,” “expect,” “foresee,” “guidance,” “intend,” “investigate,” “likely,” “may,” “plan,” “potential,” “predict,” “preliminary,” “prepare,” “potential,” “probable,” “project,” “promising,” “seek,” “should,” “will,” “would,” and similar expressions. Actual results might differ materially from those explicit or implicit in the forward-looking statements. Important factors that could cause actual results to differ materially include: the development stage of our primary clinical candidates and related risks involved in drug development, clinical trials, regulation, manufacturing and commercialization; our reliance on third parties for success in certain areas of Athenex’s business; our history of operating losses and need to raise additional capital to continue as a going concern; competition; intellectual property risks; risks relating to doing business in China; the uncertainty of when, if at all, we will be able to resume producing API in our
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Source: Athenex, Inc.