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New research suggests a simple blood test may be effective in early detection of skin cancer relapse in patients with advanced melanoma. Researchers collected blood samples from seven patients with advanced melanoma and examined the DNA tumors shed into the bloodstream, known as circulating tumor DNA. Researchers found that by tracking levels of circulating tumor DNA, they could see when new genes appeared, indicating a relapse. When this happened, there was a good chance the tumor had become resistant to treatment. [Source: Medical Daily]
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