Spectrum Pharmaceuticals Presents Additional Twice Daily Dosing Data for Poziotinib at the AACR Virtual Meeting 2021
“The 8mg BID dosing arm is showing the best performance we have seen across the various dosing arms for a mixed population of EGFR and HER2 exon 20 insertion mutations in NSCLC patients. There is clearly an improved therapeutic effect and a lower adverse event rate which is highly encouraging,” said
A copy of the AACR presentation titled “Poziotinib administered twice daily improves safety and tolerability in patients with EGFR or HER2 exon 20 mutations” is available on Spectrum’s website at https://investor.sppirx.com/events-and-presentations.
ZENITH20 Trial Design and Preliminary Safety and Efficacy Data for Cohort 5
Cohort 5 of the ZENITH20 trial includes previously treated NSCLC patients with EGFR or HER2 exon 20 insertion mutations. This cohort is investigating the efficacy of poziotinib with various dosing levels including BID administration. For the 38 patients randomized to poziotinib 16mg QD or 8mg BID in Cohort 5, improved responses were reported in the BID arm with 31.6% of patients (6/19) reaching a partial response. For the 38 patients randomized to poziotinib 12mg QD or 6mg BID, these dosing levels were not as active as 8mg BID but showed improved tolerance with BID dosing relative to QD dosing.
Improved tolerability was also observed for the typical TKI related adverse events, with a clinically meaningful reduction in Grade 3 or higher adverse events for the 8mg BID dose relative to 16mg QD. In addition, there were fewer dose interruptions and dose reductions for the BID arms relative to the same QD dose. Cohort 5 is now enrolling exclusively in the 8mg BID arm and data collection is ongoing.
Poziotinib is a novel, oral epidermal growth factor receptor tyrosine kinase inhibitor (EGFR TKI) that inhibits the tyrosine kinase activity of EGFR as well as HER2 and HER4. Importantly this, in turn, leads to the inhibition of the proliferation of tumor cells that overexpress these receptors. Mutations or overexpression/amplification of EGFR family receptors have been associated with a number of different cancers, including non-small cell lung cancer (NSCLC), breast cancer, and gastric cancer. The company holds an exclusive license from
Notice Regarding Forward-Looking Statements
Certain statements in this press release may constitute “forward-looking statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995, as amended to date. These forward-looking statements relate to a variety of matters, including, without limitation, statements that relate to Spectrum’s business and its future, including the significance of the preliminary dosing data for poziotinib, including the ability to achieve an improved therapeutic effect and a lowered adverse event rate with BID dosing; the demonstration of improved anti-tumor activity; the reduction in dose interruptions and dose reductions; poziotinib’s potential to significantly advance the treatment of NSCLC patients with EGFR or HER2 exon 20 insertion mutations; the timing and results of the company’s planned NDA submission; the overall progression of the poziotinib development program; the company’s ability to advance and fund the development and commercialization of its late-stage pipeline assets and such assets’ ability to serve areas of unmet need; the future potential of the company’s existing drug pipeline and its ability to transform the company in the near future; and other statements that are not purely statements of historical fact. These forward-looking statements are made on the basis of the current beliefs, expectations, and assumptions of the management of Spectrum and are subject to significant risks and uncertainties that could cause actual results to differ materially from what may be expressed or implied in these forward-looking statements. Risks that could cause actual results to differ include, but are not limited to, the possibility that the different methodologies, assumptions and applications the company utilizes to assess particular safety or efficacy parameters may yield different statistical results, and even if the company believes the data collected from the clinical trials of its product candidates, including poziotinib, are positive, these data may not be sufficient to support approval by the FDA; the possibility that success in early clinical trials, especially if based on a small patient sample, might not result in success in later clinical trials, and other unforeseen events during clinical trials which could cause delays or other adverse consequences; other uncertainties inherent in new product development; the possibility that Spectrum’s new and existing drug candidates, including poziotinib, may not ultimately prove to be safe or effective; the possibility that Spectrum’s new and existing drug candidates, if approved, may not be more effective, safer, or more cost efficient than competing drugs; and other risks that are described in further detail in the company's reports filed with the
Managing Director, Westwicke ICR
Chief Financial Officer