What to Test for in Patients With Early- or Late-Stage Breast Cancer

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Opening their program on HR+/HER2- metastatic breast cancer, expert oncologists consider the growing list of therapeutic targets to test for in patients with early or late-stage disease.

Transcript:

Joyce O'Shaughnessy, MD: Thank you for joining us for this Targeted Oncology™ Virtual Tumor Board®. In today’s presentation, my colleagues and I will review 2 clinical cases of hormone receptor-positive breast cancer and discuss commonly observed targetable genomic alterations and outline our approaches to biomarker testing and share our perspectives on key clinical trial data that may impact our decisions and recommendations for these patients. I’m Joyce O’Shaughnessy, a breast medical oncologist at Baylor University Medical Center, Texas Oncology, and US Oncology in Dallas, Texas. And I'm very pleased to be joined here today by 2 great clinicians and scientists who work together very commonly on molecular tumor boards, I'm very excited to hear. And I'm going to let them introduce themselves. So maybe Komal.

Komal Jhaveri, MD, FACP: Thank you so much. It's such a pleasure to be here today joining for this virtual tumor board. Very excited for that so thank you for having me. I'm Komal Jhaveri, I'm a breast medical oncologist at Memorial Sloan Kettering Cancer Center in New York. I serve as a section head for our endocrine therapy research program, and I also serve as a clinical director for the early drug development service at Memorial Sloan Kettering, so thank you.

Joyce O'Shaughnessy, MD: And Pedram?

Pedram Razavi, MD, PhD: Hi, everyone. Pedram Razavi. Delighted to be here. I'm also a breast medical oncologist at Memorial Sloan Kettering. I lead the breast molecular tumor board here and also the breast translational program, and also, I lead the liquid biopsy and genomics as part of MSK biomarker development program.

Joyce O'Shaughnessy, MD: Awesome. Fantastic. This is a great group here. We have a very interesting discussion, no question. We're going to start with the topic of molecular testing methodology, what should be our approach for early-stage and for late-stage breast cancer. So, this slide shows us some of the common molecular targets we look at in early-stage breast cancer with germline testing, hormone receptor status HER2, Ki-67 and sometimes genomic signatures that are prognostic and sometimes predictive for chemotherapy benefit. And then in metastatic breast cancer, we have a larger number of potential targets, and this is growing larger every year it seems, with our usual hormone receptor status HER2, but of course, PD-L1 expression, germline, but also some somatic mutations that are helpful, like BRCA1/2 and PALB2, and then estrogen receptor mutations, ESR1 mutations, and then mutations that lead to activation of the PI3 kinase pathway such as PIK3CA, AKT, or loss of PTEN. And then rare but very important mutations are fusions such as RET, NTRK, or high tumor mutation burden, or microsatellite instability. And this is, I'm sure, not an exhaustive list, and Pedram and Komal do a lot of phase 1 work and a lot of matching of patients with molecular alterations to therapeutic options. I'm sure their list is a lot longer than this. But this is probably from our day-to-day practice, a lot of what we focus on.

Transcript is AI-generated and edited for clarity and readability.

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