2·Steroidal aromatase inhibitor can inhibit the aromatase activity, interdict the reaction, and inhibit the estrogen formation, so that it can cure the breast cancer.
甾体芳香酶抑制剂能抑制芳香酶活性，阻断芳构化反应，抑制雌激素生成，从而达到治疗乳腺癌的目的。
3·That is to prevent esophageal cancer we try to interdict the condition and the course of esophageal cancer.
二级预防的内容主要是设法消除食管癌发生的条件或是阻断癌变过程的某一阶段。