Cancer chemoprevention is defined as the use of natural, synthetic, or biologic chemical agents to reverse, suppress, or prevent carcinogenic progression to invasive cancer.

• 摘要肿瘤的化学预防，即应用天然的、合成的或者生物化学因子逆转、抑制或阻止肿瘤进展为浸润性肿瘤。