Spectrum Pharmaceuticals (NasdaqGS: SPPI), a biopharmaceutical company focused on novel and targeted oncology therapies, today announced a poster presentation titled: High Activity of Poziotinib in G778_P780dup HER2 Exon 20 Insertion Mutations in Non-Small Lung Cancer (NSCLC). The poster will be presented at the upcoming European Society for Medical Oncology Congress (ESMO) 2022 that will take place in Paris from September 9-13, 2022.

Details of the ESMO poster presentation are as follows:

Title: High Activity of Poziotinib in G778_P780dup HER2 Exon 20 Insertion Mutations in Non-Small Lung Cancer (NSCLC)

First Author: Xiuning Le, M.D., Ph.D., Assistant Professor, Department of Thoracic/Head and Neck Medical Oncology, Division of Internal Medicine, The University of Texas MD Anderson Cancer Center, Houston

Location: Hall 4

Date: Monday, September 12, 2022

Presentation Number: 1172P

The poster will be available for viewing by registered participants during the conference via the ESMO website on September 10, 2022. It will also be available on the Investor Relations section of the company’s website at https://investor.sppirx.com/index.php/events-and-presentations.

About Poziotinib

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. HER2 exon 20 insertion mutations are a rare subset accounting for approximately 2-4% in NSCLC. There is no approved therapy specifically for either treatment-naïve or previously treated NSCLC with HER2 exon 20 insertion mutations. The company holds an exclusive license from Hanmi Pharmaceutical to develop, manufacture, and commercialize poziotinib worldwide, excluding Korea and China.

About Spectrum Pharmaceuticals, Inc.

Spectrum Pharmaceuticals is a biopharmaceutical company focused on acquiring, developing, and commercializing novel and targeted oncology therapies. Spectrum has a strong track record of successfully executing across the biopharmaceutical business model, from in-licensing and acquiring differentiated drugs, clinically developing novel assets, successfully gaining regulatory approvals and commercializing in a competitive healthcare marketplace. Spectrum has a late-stage pipeline with novel assets that serve areas of unmet need. This pipeline has the potential to transform the company in the near future. For additional information on Spectrum Pharmaceuticals please visit www.sppirx.com.

Notice Regarding Forward-looking statements

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