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Journal of Clinical Oncology, Vol 22, No 3 (February 1), 2004: pp. 507-516 © 2004 American Society of Clinical Oncology. DOI: 10.1200/JCO.2004.01.241
Effect of a Cognitive Behavioral Intervention on Reducing Symptom Severity During ChemotherapyFrom the Department of Family Practice, College of Human Medicine, and College of Nursing, Department of Epidemiology, and Data Coordinating Center, Michigan State University, East Lansing; University of Michigan Cancer Center; Institute of Gerontology, University of Michigan, Ann Arbor; St Joseph Mercy Oakland, Pontiac, MI; Yale University School of Nursing and Cancer Center, New Haven, CT; and The Johns Hopkins University, School of Nursing, Baltimore, MD Address reprint requests to Charles W. Given, PhD, Department of Family Practice, Michigan State University, B108 Clinical Center; East Lansing, MI 48824; e-mail: givenc{at}msu.edu
PURPOSE: To describe a randomized trial of a cognitive behavioral intervention on reducing symptom severity among patients diagnosed with solid tumors and undergoing a first course of chemotherapy and to determine whether the intervention had an additive or interactive effect on symptom severity in the presence of supportive care medications. PATIENTS AND METHODS: Patients (N = 237) were accrued from comprehensive and community cancer centers, interviewed, and randomly assigned to either the experimental intervention (n = 118) or conventional care (n = 119). A symptom severity index, based on summed severity scores across 15 symptoms, was the primary outcome. Each patients site of cancer, stage at diagnosis, chemotherapy protocols, and use of supportive medications were learned from medical records. RESULTS: Groups were equivalent at baseline, and attrition by characteristics by group was not different. The proportion of patients not receiving chemotherapy at 10 and 20 weeks did not differ by group. At the 10- and 20-week observations, there was a significant interaction between the experimental group and baseline symptom severity. Patients in the experimental group who entered the trial with higher symptom severity reported significantly lower severity at 10 and 20 weeks. Controlling for chemotherapy treatment status at follow-up and supportive care medications did not alter the effect of the experimental intervention. CONCLUSION: Compared with conventional care alone, the experimental intervention was effective among patients who entered the trial with higher levels of symptom severity. Age, sex, site or stage of cancer, and supportive medications did not modify the effect of this cognitive behavioral intervention on symptom severity.
Twenty-five years ago, Weisman and Worden [1] and McCorkle and Young [2] demonstrated a relationship between the presence and severity of symptoms reported by cancer patients undergoing chemotherapy and their impact on the quality of life. Subsequently, interventions to assist cancer patients to manage symptoms have focused on either a single cancer site or a single symptom (eg, pain or fatigue) and, as such, are limited as to generalizability [3]. This research tests the efficacy of a behavioral intervention for reducing the severity of multiple symptoms among patients diagnosed with different sites of cancer who are undergoing a first course of chemotherapy. What follows is a review of the literature on the concept and measurement of symptoms, a summary of the more prevalent cancer-related symptoms, a discussion of scoring approaches, and a summary of trials of behavioral interventions directed toward symptom management.
Properties of Symptoms Some researchers have argued that certain symptoms cluster together. If interventions were directed toward a symptom cluster with a particular treatment, then a synergistic effect on reductions in severity might be achieved. Cleeland et al [10] were able to separate 25 symptoms into clusters, using data from 527 outpatients, 30 bone marrow transplantation patients, and a cross-validation sample of 113 outpatients. Pain, fatigue, and insomnia were found to cluster together. Others were unable to create a cluster among these three symptoms [6]. Given et al [23] found that patients who experienced pain and fatigue reported, on average, 6.0 other symptoms (standard deviation [SD], 3.2), whereas patients reporting neither symptom reported only 1.7 (SD, 1.8) other symptoms. Similarly, reductions in pain have been associated with declines in total symptom burden [24]. Finally, patients who received supportive agents (colony-stimulating factors) during their chemotherapy reported lower levels of overall distress [23]. The prevalence, severity, and hypothesized interrelationship among symptoms, in part, could be a function of the assessment tools used. For example, the Memorial Symptom Assessment scale evaluates 32 physical and psychologic symptoms [25], the Symptom Distress Scale [26] examines 12 symptoms, the Rotterdam Symptom checklist [9] evaluates 31 symptoms, and the M.D. Anderson Symptom Inventory uses a 13- and a 19-item scale [10]. All contain some symptoms in common, but each varies in the way symptom severity and impact are assessed, and, regardless of instrument used, reports are likely to vary based on timing of administration with respect to treatment phase or type and site and stage of disease.
Behavioral Interventions
The Sample Entry criteria were as follows: patient age 21 years, diagnosis of a solid tumor, currently undergoing a first course of chemotherapy, and completion of no more than the first two cycles before the baseline interview. Patients with previous chemotherapy were not eligible, nor were patients who were undergoing radiotherapy at the time of entry. All patients had to have a family caregiver who agreed to participate in the study; both patients and caregivers had to be able to speak and read English, and both had to be cognitively intact. All patients had to be willing to participate in the 10-contact, 20-week intervention as well as telephone interviews at baseline and 10 and 20 weeks. Nurse recruiters from two comprehensive cancer centers and four community oncology settings were trained according to the study protocol and approached 609 patients who were undergoing a first course of chemotherapy. Two hundred sixty-three patients (43%) agreed to participate and signed consent forms. Among the 346 patients who refused participation, 45% (n = 155) were not interested, 17% (n = 59) had no caregiver, 16% (n = 55) were too overwhelmed by disease and treatment, and 14% (n = 48) indicated that they were too busy; other reasons were personal and formed no pattern. Of the 263 dyads who signed the approved consent forms, 26 did not complete the intake interview because caregivers could not be contacted, patients were too ill, or patients had discontinued their chemotherapy. Thus 237 patients and their family caregivers completed the intake interview and were randomly assigned to either the 10-contact, 20-week experimental intervention or to conventional care. Conventional care was the usual practice for each setting.
Attrition and retention by group at the 10- and 20-week observations are summarized in the flow diagram in Figure 1. Attrition was assessed by comparing patients who were retained and lost at 10 and 20 weeks by assigned group according to their sex, site and stage of cancer, relevant covariates, and symptom severity using
Comparing scores at baseline, no statistically significant differences were found by group for those lost and retained at 20 weeks. However, although not significant, some differences were noted. Among lung cancer patients, 69% of patients in the experimental group compared with 83% of patients in the control group were retained at 20 weeks. For the experimental group, the mean symptom severity score at baseline was 21 for those who were retained and 33 for those who were lost, compared with 26 for those who were retained and 23 for those who were lost from the control group at 20 weeks. Eighty patients (68%) assigned to the experimental group and 87 patients (73%) assigned to the control group completed the 20-week analysis.
Data Collection
The Intervention Cognitive behavioral strategies were developed to assist patients to reduce the severity of symptoms, their impact on emotional distress, and physical function [54,55]. Four classes of cognitive behavioral strategies were identified from the literature: self-care management information, problem solving, communication with provider, and counseling and support [54,56-58]. From the four classes of interventions, the nurse, with agreement from the patient, selected specific strategies for patients to implement to manage symptoms, emotional distress, and physical functioning. These strategies were derived from evidence-based standards and guidelines for practice (numerous sets of guidelines and standards exist) [59,60]. Patients who received the experimental intervention were queried at each contact regarding the severity and impact on dimensions of their quality of life of 15 symptoms (alopecia, constipation, cough, diarrhea, fatigue, fever, anorexia, coordination problems, nausea and vomiting, insomnia, dry mouth, pain, mouth sores, inability to concentrate, and shortness of breath), as well as functional limitations and emotional distress. Severity of the symptoms was rated by patients on a 10-point scale ranging from 1 (barely noticeable), to a 10 (worst possible). When severity was rated as 5 or higher, that symptom was transferred to the plan of care for problem resolution. Similarly, if patients reported that a symptom reached a threshold of 3 or higher on a 5-point scale for any one of the quality-of-life dimensions (emotions, relationships with others, sleep, concentration, appetite, usual daily activity, and overall quality of life), then it was transferred to the plan of care. As an example, a nurse might learn that a patient scored pain severity as 5 points and that it affected the patients work and emotions. The nurse might determine what medications were taken and whether pain medications were being taken at appropriate intervals and at the prescribed dosage. If not, the nurse would help the patient set up a schedule and a cueing system as a reminder to take the medications as prescribed. Next, the nurse might encourage the patient to communicate the level of pain to the oncologist. Other strategies for pain management might include use of heat or distraction to complement the administration of medication and monitoring approaches. (For examples of strategies for pain and fatigue, see Table 1).
The fidelity of the intervention was ensured by reviewing nurses adherence to the computer-guided protocol and by nurses questioning the patient and recording whether each intervention strategy was tried and, if so, was the strategy effective. If the strategy was not tried, the nurse worked with the patient to learn why the strategy was not implemented. If the intervention was not tried, revisions and alterations were suggested. The success of all interventions for a single problem was evaluated according to whether they were retained, dropped, or changed. If a strategy was effective, it was retained. The status of each problem was assessed as resolved, improving, unchanged, or deteriorating. At each contact, all unresolved problems were assessed, and the effect of each intervention was entered into the computer software program so that each problem, its duration, and the success of each intervention strategy could be documented. Quality assurance was completed for all nurses on a monthly basis to ensure that they followed protocol. This included monthly audiotapes with their patients once consent was obtained by each nurse and a review for completeness and quality of all patient encounters based on the computer documentation system. This was completed by a quality assurance coordinator who ensured adherence to the protocol. In addition, monthly reviews with feedback sessions were held with all nurse interveners for all their telephone encounters.
Measures Because some cancers are sex-specific (eg, breast cancer), plausible combinations of sex and site of cancer categories were developed, which included male and female lung, male and female colon, male and female other cancer sites, and female breast cancers. Appropriate dummy variables were then created to assess the effect of combinations of sex and cancer site variables in the multivariate models. This approach was used to avoid empty cells for certain sexcancer site combinations. Sites of cancer were collected through an audit of medical records and included breast, lung, colon, and a number of other cancer sites that included pancreatic and ovarian (Table 2). Cancer stage was classified according to the tumor-node-metastasis system staging criteria of the American Joint Committee on Cancer [61]. This system classifies tumors on a scale of 0 to IV. For this study, stage of disease was collapsed into early (in situ, or zero, and stages I and II) and late (stages III and IV). The distributions of all these variables at baseline are presented in Table 2.
Chemotherapy Treatment Status and Use of Supportive Medications A number of treatment protocols were used to treat the different sites and stages of cancer. Therefore, it was necessary to compare the experimental and control groups to determine whether there were differences in the symptom severity index by chemotherapy treatment status at the 10- and 20-week observations. All patients were undergoing chemotherapy at enrollment, as this was a criterion for inclusion. To determine chemotherapy treatment status at the 10- and 20-week observations, audits of medical records were organized to determine whether patients completed their chemotherapy protocol, whether protocols had been altered, or whether a dose had been withheld or delayed, and when these events occurred. Table 3 describes the numbers and percentage of patients at the 10- and 20-week observations according to current chemotherapy treatment status. The 2 test of independence indicated no significant difference at the 5% level of significance by group at either observation. To determine whether treatment status alone or interaction with group had an effect on symptom severity at the 10- and 20-week observation, general linear models (GLMs) were developed to compare symptom severity by group and chemotherapy status at each observation. There were no significant differences at the 5% level of significance in symptom severity by chemotherapy status alone or for the interaction with group.
Finally, based on audits of patients medical records, each type of supportive care medication prescribed for the experimental and control groups during the 5 months of the trial was identified. No between-group differences were observed in prescribing of these medications. First, the proportion of each category of supportive medications was compared by group and then summarized overall for each group according to the mean number of medications prescribed. At the 5% level of significance, no differences were found by group in the proportion of each medication prescribed, and no differences by group were observed in the mean number of medications. Because all patients were enrolled onto the study within their first two cycles of chemotherapy, we were confident that supportive medications were prescribed at some point before the 20-week interview.
Data Analysis
Tests for equivalencies at baseline, according to group assignment, were completed through two-sample t tests for continuous variables and The primary hypothesis sought to compare the experimental and control groups according to their scores at 10 and 20 weeks on the symptom severity index after adjusting for important baseline characteristics. Because of differences in the number of observations after 10 and 20 weeks owing to death or withdrawal, a repeated measures analysis of variance design was not used. Instead, a GLM was used to test separate group effects at 10 and 20 weeks. By testing for group effects at both 10 and 20 weeks, we could determine whether and when the intervention might affect symptom severity. The following regression model was used for the primary outcome: symptom severity at 10 and 20 weeks = symptom severity at baseline + study group + covariates (age, sex and cancer site, stage of disease) + study group interaction with severity index at baseline The essential parameter tested in the model is associated with the study group variable, but in the case of interactions, the group effect was dependent on another covariate. In such instances, we report the final model to describe the interactive effect of the groups with covariates [62-64]. Finally, two models were tested: one examining the additive effects of supportive medications and a second exploring possible interactions between group and numbers of supportive care medications on symptom severity at the 20-week observation.
Forty percent of the sample was composed of female breast cancer patients, followed by 34% with lung cancer. Two thirds of the patients had cancers at stage III or greater at the time of entry onto the study. More than 75% of the participants were female, with three quarters of the patients coming from comprehensive cancer centers (Table 2). Table 4 lists the means and SDs for symptom severity and number of symptoms for patients surviving through the 10- and 20-week observations.
For patients in the experimental group, all symptoms reached threshold and, in order of frequency, were fatigue, alopecia, insomnia, pain, constipation, and diarrhea. By the end of the intervention, the percentage of patients who had implemented strategies for lowering severity below baseline threshold for selected symptoms were as follows: alopecia (72%), constipation (70%), fatigue (46%), nausea (56%), insomnia (71%), pain (50%), physical limitation (50%), and diarrhea (72%). In the initial models, baseline symptom severityalong with age, sex by sites of cancer, stage of disease, and group by baseline symptom severitywere entered to explain symptom severity at the 10- and 20-week observations. Age, stage, and sex by site of cancer had no effect on symptom severity at either the 10- or 20-week observations and, therefore, were removed from the final models. Tables 5 and 6 present the parameter estimates, SEs, t values, and significance for baseline severity, group, and the interaction of group and baseline severity on symptom severity at 10 and 20 weeks, respectively. Baseline severity affected severity at both 10 and 20 weeks. There was no main effect for group, but there was a strong statistically significant effect for the interaction of group and baseline severity on symptom severity at 10 and 20 weeks. Figures 2 and 3 show the interactive effects of group and baseline symptom severity on severity at 10 and 20 weeks, respectively. The equations for deriving each figure are included as footnotes. Patients who entered the study with higher symptom severity and who received the experimental intervention reported lower symptom severity at both the 10- and 20-week observations than their counterparts who received conventional care alone.
Because the distributions of symptom severity scores were slightly skewed toward the lower range, we inspected the residuals of the symptom severity index. This analysis revealed no specific departure from the assumptions of the ordinary least squares. Specifically, the error terms were centered around zero, with approximately equal variance terms between the experimental and control groups [62]. Therefore, the assumption of the GLM was not violated. The potentially confounding effects of supportive medications on symptom severity at 20 weeks were evaluated (Table 7). Baseline severity, along with number of supportive medications, group, and the interaction between the number of supportive care medications and group, was entered to explain symptom severity at 20 weeks. Because group by number of supportive care medications did not reach significance, we concluded that there was no significant interaction effect between the numbers of supportive care medications and the behavioral intervention in reducing reported symptom severity at 20 weeks.
Finally, we entered baseline severity, group, and numbers of supportive care medications into the model. There was a significant main effect for baseline severity (P < .00) and for the interaction of group with baseline severity (P <.02 for the 20-week observation). The number of supportive medications had a statistically significance effect (P < .01). However, the sign of the estimate indicated that the number of supportive medications was associated with increasing, not decreasing, levels of symptom severity at 20 weeks. Thus even after adjusting for the number of supportive care medications, a statistically significant interaction remained between group and symptom severity at baseline on the reduction in symptom severity at 20 weeks.
The results of this randomized trial indicate that for patients undergoing a first course of chemotherapy, a 10-contact, 20-week, nurse-administered cognitive-behavioral intervention focusing on symptom management resulted in significantly lower levels of symptom severity for patients who entered the trial with higher severity scores at 10 and 20 weeks compared with patients receiving conventional care alone. In this assessment of symptom severity at 10 and 20 weeks, baseline symptom severity was treated as a continuous covariate. The coefficient for baseline severity and the coefficient for the interaction of baseline severity and group indicated that as baseline severity increases, the effect of the intervention increases. The adjusted means comparing symptom severity scores for the experimental and control group at 10 and 20 weeks for increasing baseline severity scores summarizes these relationships (Table 8). No attempt was made to establish a clinical threshold at which the intervention would have a clinical effect. However, given the greater effect of the intervention among patients with higher baseline severity, future analyses should focus on where clinically important thresholds may occur. The effect of the intervention with increasing baseline severity was unaffected by the numbers of supportive medications administered to patients.
Trials of behavioral interventions [30-33] report effect sizes ranging from 0.16 to 0.90, depending on the symptom under investigation and the type of intervention. In this study, the observed mean severity differences between the groups (delta) were 6.69 with an SD of 19.65, leading to an effect size of 0.34 at 10 weeks. At 20 weeks, the difference between groups was 5.87, with an SD of 19.65 and an effect size of 0.30. These observed effect sizes are smaller than the 0.35 used to establish sample size for this trial and are in the middle range reported by the literature. Comparisons among effect sizes are difficult to make because some trials target single symptoms, whereas others are reported for multiple symptoms. Further, although patients presented with different constellations of symptoms, this behavioral intervention, which followed a problem-solving approach targeted toward those symptoms that reached threshold, was able to engage patients in specific intervention strategies designed to reduce total symptom burden. Finally, when this behavioral intervention was tested against the receipt of supportive care medications, those with higher severity at 20 weeks received more medications, but no evidence was found to indicate that supportive medications confounded the effects of the intervention. This is one of the few trials that has contrasted the impact of a behavioral intervention with supportive care medications to better understand how these two approaches might work independently or might complement one another. Several limitations of this trial should be noted. First, the accrual rate was below 50%; little is known about those who refused participation except that they had a solid tumor and were within two cycles of beginning an initial course of chemotherapy. Second, although no statistical differences were observed at the 20-week observation, greater attrition from the experimental group suggested that some patients might have viewed the intervention as an additional burden. Further, patients who attrited from the experiment tended to report more severe symptoms. Although we found no evidence that supportive care medications influenced the impact of the behavioral intervention, this comparison must be considered crude. We have no indication of whether medications were taken as prescribed, whether the dosage was appropriate, or whether the severity of the condition that prompted the prescription was correctly recorded. This 10-contact, 20-week cognitive behavioral intervention demonstrated significant impact on patient symptom severity after only four contacts (10 weeks), and this difference was sustained over 20 weeks. The behavioral intervention was integrated into the ongoing treatment plans of patients and family caregivers by assessing patients during their chemotherapy clinic visits and interspersing additional contacts via telephone. Finally, this trial demonstrated that the cognitive behavioral intervention had a significant interaction with higher symptom severity at baseline and that this effect was sustained over and beyond the effects of supportive medications prescribed for patients. Finally, from a clinical perspective, it is important to identify interventions that can be directed toward patients high symptom burden. This intervention may be such a solution.
The authors indicated no potential conflicts of interest.
We thank Danielle DeVoss, PhD, Assistant Professor of American Thought and Language, Michigan State University, for her editorial contributions.
Supported by National Cancer Institute grant RO1 CA79280; Family Home Care for Cancer: A Community-Based Model, in affiliation with the Walther Cancer Institute, Indianapolis, IN; and National Institute of Aging grant P30 AG08808. Authors disclosures of potential conflicts of interest are found at the end of this article.
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Copyright © 2004 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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