Mental health and cancer are closely linked—for example, patients with depression have a higher incidence of specific cancers¹ and have a worse prognosis in observational studies than do patients without depression.² What is not clear is whether this association can be positively influenced, either by the effective treatment of depression or by addressing the causative factors. Previous research³ suggests that depression is also linked with cardiovascular mortality and, in this case, effective treatment of depression appears to ameliorate this excess mortality.

中文翻译：

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为什么抑郁症治疗不能改善癌症生存率？

心理健康与癌症密切相关，例如，抑郁症患者比非抑郁症患者发生特定癌症的几率更高^1，并且观察性研究的预后较差。²尚不清楚的是，这种联系是否可以通过有效治疗抑郁症或解决病因而受到积极影响。先前的研究³表明，抑郁症也与心血管疾病的死亡率有关，在这种情况下，有效的抑郁症治疗似乎可以改善这种过高的死亡率。