Alterations in morning cortisol associated with PTSD in women with breast cancer

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Abstract

Objective

Diagnosis and treatment of breast cancer can be a stressful experience, putting women at risk of posttraumatic stress disorder (PTSD). The current study investigated morning cortisol levels in newly diagnosed (i.e., within 6 months) breast cancer patients.

Methods

Structured DSM-IV interviews determined current and past incidence of PTSD and major depressive disorder (MDD) in 71 women with Stage 0–3 breast cancer.

Results

Significantly decreased plasma cortisol was found in women meeting current or lifetime criteria for PTSD or past diagnosis of MDD.

Conclusions

These results reinforce the importance for both psychological and physiological outcomes of a clinical evaluation of both current and past psychiatric status in newly diagnosed cancer patients.

Introduction

Although a diagnosis of posttraumatic stress disorder (PTSD) requires exposure to an extreme traumatic stressor, surprisingly large percentages of the population have been exposed to traumatic events. Resnick et al. [1] found that approximately two thirds of women in the United States had experienced a significant traumatic event, with PTSD prevalence rates of 12.3% lifetime diagnosis and 4.6% current diagnosis. Recent research has found symptoms of PTSD in women with breast cancer, and estimates of the prevalence of PTSD in newly diagnosed patients range from 3% to 10% [2], [3]. Elevated symptoms of anxiety and depression near the time of diagnosis are also common and have been reported in 30% to 40% of patients [4]. Although few studies of the prevalence of clinically diagnosed major depressive disorder (MDD) have been reported, Dausch et al. [5] found prevalence rates of 6.7% for a current diagnosis and 23% for a lifetime diagnosis in women newly diagnosed with breast cancer.

The level of emotional distress of breast cancer patients may have physiological consequences relevant to cancer [6]. Numerous investigations have shown cortisol and immune alterations associated with distress. Neuroendocrine function can be influenced by a variety of genetic or environmental factors, including trauma exposure. In noncancer populations, lower cortisol has been associated with PTSD [7]. In contrast, increased cortisol has been associated with MDD, although decreased cortisol has been reported in “atypical depression” [8]. Variations in cortisol levels can directly impact neoplastic growth and immune parameters (e.g., T-cell proliferation) relevant to the progression of breast cancer, suggesting that psychological factors that influence immune function may also influence cancer outcomes [6].

This study evaluated cortisol levels associated with PTSD and MDD in women newly diagnosed with breast cancer. Women with MDD were expected to show elevated cortisol relative to those with no diagnosis. In contrast, women with PTSD were expected to show lower cortisol. High rates of comorbid PTSD and MDD have been found [9]; thus, it was anticipated that women with PTSD would show high rates of comorbid MDD.

Section snippets

Participants

Participants included 71 women (age 34–82, mean 53; 98% Caucasian) newly diagnosed (i.e., within the last 6 months) with breast cancer. The sample included women participating in a larger study of psychosocial intervention. Data reported represent preintervention measures. Cancer stage at diagnosis included 14% Stage 0 (in situ), 38% Stage 1, 42% Stage 2, and 6% Stage 3.

Measures and procedure

PTSD and MDD prevalence were determined with structured DSM-IV diagnostic interviews developed as an adaptation of the DSM-IV

Rates of PTSD and MDD in the sample

Current or past PTSD was diagnosed in 18.3% of the women (5.6% current, 12.7% past). Diagnoses were attributable to abuse or assault (57%), the diagnosis and treatment of breast cancer (15%), witnessing a death (14%), or other causes (13%). Comparable to previous studies, 3% of women in the entire sample met criteria for current PTSD due to breast cancer. No women met criteria for a current diagnosis of MDD, although a past diagnosis was found in 25%. A high level of comorbidity was found; 39%

Discussion

A diagnosis of PTSD (current or past) was found in 18% of women in this sample of newly diagnosed breast cancer patients. Psychobiological correlates were evident, including lower cortisol in women with current or past PTSD. The number of PTSD symptoms endorsed was negatively correlated with cortisol, suggesting that the amount of HPA disruption varies with the severity of the PTSD symptoms experienced. Surprisingly, cortisol levels did not differ between women with a current or a past

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