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MEK inhibitor sensitivity in BRAF fusion-driven prostate cancer. | LitMetric

AI Article Synopsis

  • Scientists are trying to find specific types of prostate cancer that can be treated with special medicines, and they discovered something unusual called a BRAF fusion in some patients.
  • They studied 41 patients with advanced prostate cancer to look for rare changes in their genes, which could help understand and treat these cancers better.
  • One patient had a unique gene change and responded really well to a medicine called trametinib, showing that certain prostate cancers might need special treatments based on their unique gene setups.

Article Abstract

Purpose: The identification of subpopulations harboring druggable targets has become a major step forward in the subclassification of solid tumors into small groups suitable for specific therapies. BRAF fusions represent a paradigm of uncommon and targetable oncogenic events and have been widely correlated to the development of specific malignancies. However, they are only present in a limited frequency across most common tumor types. At this regard, we performed a genomic screening aimed to identifying rare variants associated to advanced prostate cancer development.

Methods: Tumoral tissue genomic screening of 41 patients developing advanced prostate cancer was performed at our center as part of the GETHI XX study. The project, sponsored by the Spanish Collaborative Group in Rare Cancers (GETHI), aims to analyze the molecular background of rare tumors and to discover unfrequent molecular variants in common tumors.

Results: Here we present the clinical outcome and an in-deep molecular analysis performed in a case harboring a SND1-BRAF fusion gene. The identification of such rearrangement in a patient refractory to standard therapies led to the administration of trametinib (MEK inhibitor). Despite unsensitive to standard therapies, the patient achieved a dramatic response to trametinib. A comprehensive study of the tumor demonstrated this event to be a trunk alteration with higher expression of MEK in areas of tumor invasion.

Conclusions: Our study describes the patient-driven discovery of the first BRAF fusion-driven prostate cancer effectively treated with trametinib. Consequently, MAPK pathway activation could define a new subtype of prostate cancer susceptible to a tailored management.

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Source
http://dx.doi.org/10.1007/s12094-022-02916-6DOI Listing

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