NeuVax™ + trastuzumab, HER2 1+,2+

Disease: Breast Cancer
Status: Enrolling Patients
Trial Design: Phase 2b

This investigator-sponsored trial (IST) is ongoing with NeuVax in combination with trastuzumab (Herceptin®; Genentech/Roche). The combination of trastuzumab and NeuVax has been shown pre-clinically and in a pilot study to be synergistic. Our Phase 2b clinical trial is a randomized, multicenter, investigator-sponsored, 300 patient study enrolling HER2 1+ and 2+, HLA A2+, A3+, A24 and/or A26, node positive, and high-risk node negative patients. Eligible patients are randomized to receive NeuVax + GM-CSF + trastuzumab or trastuzumab + GM-CSF alone. The primary endpoint of the study is disease-free survival. Genentech/Roche is providing the trastuzumab and partial funding for this trial.

Data presented in October 2016 demonstrated that this novel combination of trastuzumab and NeuVax with HER2 low-expressing patients is well tolerated and the cardiac effects of trastuzumab are not impacted by the addition of NeuVax. In February 2017, the Data Safety Monitoring Board (DSMB) reported that there were no safety concerns with the trial and the trial is not futile. The recommendation from the DSMB was to continue the trial with one revision to the statistical analysis plan regarding the timing of the pre-specified interim analysis. Given the lengthy duration of enrollment for the trial, the DSMB determined that the pre-specified interim efficacy analysis be moved up from 12 months to 6 months after the last patient is enrolled. Completion of enrollment is expected in the second quarter of 2017; therefore, the DSMB expects to perform the interim efficacy analysis near the end of 2017.

This investigator-sponsored trial is a clinical collaboration between Galena, Genentech/Roche, and the Henry M. Jackson Foundation.

Trial Design and Eligibility Identifier NCT01570036

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About the disease

According to the National Cancer Institute (NCI), over 230,000 women in the U.S. are diagnosed with breast cancer annually. While improved diagnostics and targeted therapies have decreased breast cancer mortality in the U.S., metastatic breast cancer remains incurable. Approximately 75% to 80% of breast cancer patients have tissue test positive for some increased amount of the HER2 receptor, which is associated with disease progression and decreased survival. Only approximately 20% to 30% of all breast cancer patients-those with HER2 immunohistochemistry (IHC) 3+ disease, or IHC 2+ and fluorescence in situ hybridization (FISH) amplified-have a HER2 directed, approved treatment option available after their initial standard of care. This leaves the majority of breast cancer patients with low-to-intermediate HER2 expression (IHC 1+, 2+) ineligible for therapy and without an effective targeted treatment option to prevent cancer recurrence.

New cases of breast cancer occur at an annual rate of 125 per 100,000 women in the U.S., with an estimated 246,660 new cases and 40,450 deaths in 2016. Approximately 89.7% of breast cancer patients are expected to survive five years after diagnosis. Approximately 12.4% of women will be diagnosed with breast cancer at some point during their lifetime (2011 – 2013 data). The prevalence data from 2013 showed an estimated 3,053,450 women living with breast cancer in the United States. Source: National Cancer Institute Surveillance, Epidemiology, and End Results Program.