Agree that cancer is dangerous but it doesn't mean that it's not curable. If cancers detected in early stages, then it can be surely treated better, incurring less physical, mental and financial suffering. Getting afraid or doing worry is not solution at all. Instead of take preventive actions to reduce the cancer risk.
Two major components for early detection of cancer are :
1. Education and awareness to promote early diagnosis
2. Screening tests to detect them early
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