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We're among the tens of thousands of dedicated individuals from all over the world who come together to talk about advancements in the field of oncology during these few days... Yesterday morning, our Senior Medical Director, Jeremy Gaerlan joined attendees to watch a series of eagerly awaited Late-Breaking Abstract (LBA) presentations. First were the results from the DESTINY-Breast06 study. Dr. Giuseppe Curigliano, lead author, received both applause and intrigue after presenting the primary results from DESTINY-Breast06—echoing the enthusiasm seen in 2022 with the unveiling of the DESTINY-Breast04 study and the introduction of the HER2-low category. We've seen applause year after year in this space. The DESTINY-Breast06 study revealed that patients with HR+/HER2-low status experienced a significant and clinically meaningful extension in mPFS with trastuzumab deruxtecan (T-DXd) compared to chemotherapy (13.2 months vs. 8.1 months, respectively; HR=0.62; P<0.0001). Additionally, a subgroup analysis indicated a similar improvement in mPFS for patients with HR+/HER2-ultralow status (13.2 months vs. 8.3 months; HR=0.78). These findings mark the first instance of a HER2-targeted ADC demonstrating clinical efficacy in the HER2-ultralow category. Breast cancer encompasses various subtypes, distinguished by HER2 protein expression levels. The novel HER2-ultralow category further refines the existing HER2 status classifications. Previously categorized as HER2-negative, HER2-low and HER2-ultralow cancers are now being recognized to exhibit low HER2 expression. The study’s implications have sparked widespread discussion among media and conference participants regarding the accurate diagnosis of HER2-, HER2-low, and HER2-ultralow statuses. Dr. Ian Krop, discussant for the presentation, highlighted the challenges pathologists may face, particularly the current limitations of HER2 testing assays. Needless to say, it will be interesting to see how guideline committees and the oncology field would adapt to a new HER2-ultralow designation! #breastcancerexpert #oncexpert

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Eric Kallin

Medical and Scientific Strategy

3mo

Thank you for keeping me up to date, Jeremy Gaerlan!

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