The Effect of Melatonin on Depression, Anxiety, Cognitive Function and Sleep Disturbances in Breast Cancer Patients The purpose of this study is to investigate the effect of 6 mg melatonin daily for 1 week preoperatively to 12 weeks postoperatively on depressive symptoms, anxiety, cognitive function and...

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The Use of Major Depression Inventory (MDI) in Measuring Preoperative Depressive Symptoms in Breast Cancer Patients The purpose of this study is to measure depressive symptoms in breast cancer patients before surgery with Major Depression Inventory (MDI). The investigators hypothesize that this patient ...

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Study of the Correlation Between Specific Genes and Cognitive Dysfunction After Surgery The purpose of this study is to determine whether a certain clock-gene (HPER3) with the 5/5 genotype carries a higher risk of post-operative cognitive dysfunction.

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Circadian Disturbances After Breast Cancer Surgery The purpose of this study is to investigate circadian disturbances after breast cancer surgery by means of monitoring sleep and heart-rate variability, by measuring a metabolite of melaton...

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