San Francisco, CA -- Quantum Leap Healthcare Collaborative (QLHC) joins Merck in acknowledging the promising data from the KEYNOTE-522 trial. Merck recently announced that the Phase 3 KEYNOTE-522 trial met a primary endpoint, demonstrating statistically significant improved rates of pathological complete response for KEYTRUDA® (pembrolizumab), Merck’s anti-PD-1 therapy, in combination with chemotherapy as neoadjuvant therapy for patients with triple negative breast cancer (TNBC). The positive finding serves as validation of the QLHC-sponsored I-SPY 2 trial, an adaptive phase II platform trial designed to rapidly screen agents and find the most effective drug combinations for each specific tumor subtype. In this study, patients start with chemotherapy before surgery so that response to treatment can be assessed. I-SPY 2’s evaluation of pembrolizumab formed the basis for targeting the immunotherapy to the TNBC subtype.

As stated by Dr. Roger M. Perlmutter, president, Merck Research Laboratories , “When I have been asked over the last two years why I was prepared to see Merck initiate a Phase 3 trial in triple negative breast cancer, my response has always rested heavily on data from I-SPY 2. The KEYNOTE-522 pCR results offer promise for triple negative breast cancer patients who need better treatment options.”

The I-SPY 2 trial is considered the archetype of a new approach to clinical trials. Rather than the traditional ‘one drug, one disease’ model for drug development, it is a ‘platform’ trial. I-SPY 2 evaluates up to 5 drugs (or combination of drugs) in parallel with the goal of determining which drugs work best in various types of breast cancer. I-SPY 2 is also designed for efficiency and speed, by employing an ‘adaptive’ statistical model. In this approach, the results of each patient are used to refine how the investigational drugs are assigned to new patients. In this way, I-SPY 2 can achieve
similar results in a fraction of the time with fewer patients than traditional trials. The goal is to get the right drug to the right patient at the right time.

In results presented at the 2017 American Society of Clinical Oncology Annual Meeting, I-SPY 2 investigators reported that pembrolizumab, when added to standard neoadjuvant therapy for early breast cancer, nearly tripled the response (the chance of the tumor going away before surgery) in HER2 negative breast cancer subtypes. It was observed to be particularly effective in the difficult-to-treat ‘triple negative’ subset of breast cancers, which do not express genes for estrogen or progesterone receptors, nor the HER2 oncogene. I-SPY 2’s adaptive model predicted that there was a greater than 99% chance that the treatment regimen including pembrolizumab would be successful in a Phase 3 trial in TNBC.

I-SPY 2 principal investigator, Dr. Laura Esserman of the University of California San Francisco, said the KEYNOTE-522 results validate both I-SPY 2’s pioneering approach and the vision of Merck leadership for being one of the trial’s early partners.

“The whole I-SPY team is thrilled to see that the KEYNOTE-522 results came out just as we predicted. It is an important advance for TNBC patients and a clear demonstration that the I-SPY model can not only accelerate the development of new cancer treatments, it can target treatment to the patients who will benefit most.”

Importantly, the 2017 I-SPY 2 results were obtained after only 11 months and enrolling only 69 patients to the pembrolizumab arm of the study; Traditional Phase 2 trials typically require 100-200 patients and last two years or more.

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