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What Is Cancer? - NCI - National Cancer Institute
Cancer - Symptoms and causes - Mayo Clinic
Cancer - Wikipedia
Cancer - World Health Organization (WHO)
What is Cancer? | Cancer Basics | American Cancer Society
Comprehensive Cancer Information - NCI
Cancer: Types, Causes, Treatment, and Prevention - Healthline
What Is Cancer? Symptoms, Signs, Types & Causes - Cleveland Clinic
All About Cancer | American Cancer Society
Understanding Cancer - NCI
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