A liquid biopsy is a blood test that detects cancer DNA, giving a snapshot of tumours without surgery. Right now, it can truly tell you about key mutations to guide targeted therapy and track treatment response. But in my tiny lab, I see the obvious answer is its cost; my life's work is stripping it down to a fraction so it can tell a chai-wallah's family something useful, not just a corporate hospital's patients. We are proving that a reliable assay doesn't need gold-plated machines, just clever chemistry and a stubborn heart.
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