I read with interest the article by Zheng and colleagues ([1][1]) showing that some beta-blockers increase the risk of breast cancer and that this effect depends on the dosage as well as the affinity of the beta-blockers for beta-adrenergic receptor subtypes. While the authors found no effect of

中文翻译：

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β-受体阻滞剂和乳腺癌——来信

我饶有兴趣地阅读了 Zheng 及其同事 ([1][1]) 的文章，该文章表明某些 β 受体阻滞剂会增加患乳腺癌的风险，而且这种影响取决于剂量以及 β 受体阻滞剂对 β 的亲和力-肾上腺素能受体亚型。虽然作者发现没有影响