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More cases of prostate cancer were diagnosed at Stage 4 in recent years compared with about a decade earlier, a development that experts behind a new study suggest could be linked with official recommendations discouraging the use of a hotly debated screening test.The prostate-specific antigen test is a simple blood test that can serve as an early warning signal of cancer in men with no symptoms. But the test also has risks: It can lead to overdiagnosis and overtreatment of slow-growing prostate tumours that might never have caused harm had they remained undiscovered. For that reason, a...