Spectrum Pharmaceuticals Announces Publication of Poziotinib Data in Nature Medicine

Spectrum Pharmaceuticals, Inc. (NasdaqGS: SPPI), a biotechnology Company with fully integrated commercial and drug development operations with a primary focus in Hematology and Oncology, today announced a publication entitled, “Mechanisms and clinical activity of an EGFR and HER2 exon 20–selective kinase inhibitor in non–small cell lung cancer.” The publication appears in the April 23, 2018 online issue at https://www.nature.com/articles/s41591-018-0007-9 and will be published in a future print issue of Nature Medicine.

“We are honored to have data from poziotinib published in this prestigious journal,” said Joe Turgeon, President and CEO of Spectrum Pharmaceuticals. “The excitement around poziotinib is palpable among the medical community. For cancer patients that have exon 20 mutations, physicians have very few options. The publication shows that poziotinib has a strong potential to be a promising therapy for such patients. We are collaborating with the medical community, regulatory agencies and corporate partners to expedite the rapid development of this drug.”

The Nature Medicine publication summarizes the current preclinical and clinical data with poziotinib for EGFR and HER2 exon 20 mutations. MD Anderson utilized in silico, in vitro, and in vivo testing to model structural alterations induced by exon 20 mutations and identify potentially effective inhibitors. 3-D modeling indicated alterations restricted the size of the drug binding pocket, limiting the binding of large, rigid inhibitors. It was found that poziotinib, due to its small size and flexibility, can circumvent these steric changes, and is a potent inhibitor of the most common EGFR and HER2 exon 20 mutants. Poziotinib demonstrated greater activity than approved EGFR TKIs in vitro and in EGFR or HER2 exon 20 mutant patient-derived xenograft models, and genetically engineered mouse models of NSCLC.

According to the Nature Medicine publication, the first 11 NSCLC patients with EGFR exon 20 mutations receiving poziotinib in MD Anderson’s Phase 2 clinical trial had a confirmed objective response rate of 64%. At the time of the publication, the median progression-free survival had not been reached, with a median follow up of 6.6 months. 55% of patients received a dose reduction, with the two most common adverse events being known EGFR inhibitor-related toxicities: skin rash and diarrhea. At the World Conference on Lung Cancer in October 2017, MD Anderson presented that all of the 11 patients had a radiologic improvement in their disease, and 8 out of the 11 patients had a partial response (73% objective response rate). In the Nature Medicine publication it was reported that 7 out of those 11 patients had confirmed partial response (64% objective response rate).