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Thyroid Caacer Thyrocytes C cells Papillary Follicular Anaplastic Medullary 80.2％ 12.4％ 0.9％ 2.5％ Thyroid Cancer Incidence Rate in the US Women, SEER 2010 (per 100,000) · Breast 120.9· Lung 48.7· Colon & Rectum 36.3· Corpus Uterus 24.9· Thyroid 19.7· Melanoma of skin 16.8· NHL 16.1· Ovary 11.9· Pancreas 10.8· Kidney and renal 10.2 Plausible Explanations Ⅰ.The apparent epidemic is due to increased detection of the disease due to enhanced screening Ⅱ.A real increase in disease has occurred due to environmental factors Ⅲ.A combination of these events.