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flag Japan approves first blood test to detect breast cancer mutations for targeted therapy.

flag Guardant Health Japan has received approval from Japan’s MHLW for its Guardant360 CDx liquid biopsy test as a companion diagnostic to detect ESR1 mutations in patients with hormone receptor-positive, HER2-negative advanced breast cancer that has progressed after endocrine therapy. flag Approved on October 23, 2025, it is the first blood-based test approved in Japan for this purpose, enabling non-invasive genomic profiling to guide treatment with imlunestrant. flag The test identifies mutations linked to resistance against aromatase inhibitors, found in 20% to 40% of patients after prior therapy, and is now covered under Japan’s national health insurance at designated cancer genome hospitals.

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