"Understanding how the immune system works is going to play a significant role in our treatment of cancer going forward," says Dr. Len Lichtenfeld of the American cancer Society.

“了解免疫系统的工作机理将在推动癌症治疗进展的过程中发挥非常重要的作用。”美国癌症学会的莱恩·利希滕菲尔德博士说。

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We spoke to Dr. Len Lichtenfeld, deputy chief medical officer at the American Cancer Society, to put this study in perspective for the everyday smoker.

CNN: Simple test may determine smokers' lung cancer risk

"To prove that a targeted therapy even worked was incredible a few years ago, " says Len Lichtenfeld, deputy chief medical officer of the American Cancer Society.

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However, the potential risks may be acceptable to women who have no other options, said Dr. Len Lichtenfeld, deputy chief medical officer for the American Cancer Society.

CNN: New late-stage breast cancer treatment approved