Bruce Cooper

University of California, San Francisco, San Francisco, CA, USA

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Publications (27)91.09 Total impact

  • Article: Differences in the symptom experience of older versus younger oncology outpatients: a cross-sectional study.
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    ABSTRACT: BACKGROUND: Mortality rates for cancer are decreasing in patients under 60 and increasing in those over 60 years of age. The reasons for these differences in mortality rates remain poorly understood. One explanation may be that older patients received substandard treatment because of concerns about adverse effects. Given the paucity of research on the multiple dimensions of the symptom experience in older oncology patients, the purpose of this study was to evaluate for differences in ratings of symptom occurrence, severity, frequency, and distress between younger (< 60 years) and older ( >= 60 years) adults undergoing cancer treatment. We hypothesized that older patients would have significantly lower ratings on four symptom dimensions. METHODS: Data from two studies in the United States and one study in Australia were combined to conduct this analysis. All three studies used the MSAS to evaluate the occurrence, severity, frequency, and distress of 32 symptoms. RESULTS: Data from 593 oncology outpatients receiving active treatment for their cancer (i.e., 44.4% were < 60 years and 55.6% were >= 60 years of age) were evaluated. Of the 32 MSAS symptoms, after controlling for significant covariates, older patients reported significantly lower occurrence rates for 15 (46.9%) symptoms, lower severity ratings for 6 (18.9%) symptoms, lower frequency ratings for 4 (12.5%) symptoms, and lower distress ratings for 14 (43.8%) symptoms. CONCLUSIONS: This study is the first to evaluate for differences in multiple dimensions of symptom experience in older oncology patients. For almost 50% of the MSAS symptoms, older patients reported significantly lower occurrence rates. While fewer age-related differences were found in ratings of symptom severity, frequency, and distress, a similar pattern was found across all three dimensions. Future research needs to focus on a detailed evaluation of patient and clinical characteristics (i.e., type and dose of treatment) that explain the differences in symptom experience identified in this study.
    BMC Cancer 01/2013; 13(1):6. · 3.01 Impact Factor
  • Article: Identification of patient subgroups and risk factors for persistent breast pain following breast cancer surgery.
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    ABSTRACT: Study purposes were to determine the prevalence of persistent pain in the breast; characterize distinct persistent pain classes using growth mixture modeling; and evaluate for differences among these pain classes in demographic, preoperative, intraoperative, and postoperative characteristics. In addition, differences in the severity of common symptoms and quality of life outcomes measured prior to surgery, among the pain classes, were evaluated. Patients (n = 398) were recruited prior to surgery and followed for 6 months. Using growth mixture modeling, patients were classified into no (31.7%), mild (43.4%), moderate (13.3%), and severe (11.6%) pain groups based on ratings of worst breast pain. Differences in a number of demographic, preoperative, intraoperative, and postoperative characteristics differentiated among the pain classes. In addition, patients in the moderate and severe pain classes reported higher preoperative levels of depression, anxiety, and sleep disturbance than the no pain class. Findings suggest that approximately 25% of women experience significant and persistent levels of breast pain in the first 6 months following breast cancer surgery. PERSPECTIVE: Persistent pain is a significant problem for 25% of women following surgery for breast cancer. Severe breast pain is associated with clinically meaningful decrements in functional status and quality of life.
    The journal of pain: official journal of the American Pain Society 12/2012; 13(12):1172-87. · 3.78 Impact Factor
  • Article: Trajectories of Sleep Disturbance and Daytime Sleepiness in Women Before and After Surgery for Breast Cancer.
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    ABSTRACT: CONTEXT: Sleep disturbance is a problem for oncology patients. OBJECTIVES: To evaluate how sleep disturbance and daytime sleepiness (DS) changed from before to six months following surgery and whether certain characteristics predicted initial levels and/or the trajectories of these parameters. METHODS: Patients (n=396) were enrolled prior to surgery and completed monthly assessments for six months following surgery. The General Sleep Disturbance Scale was used to assess sleep disturbance and DS. Using hierarchical linear modeling, demographic, clinical, symptom, and psychosocial adjustment characteristics were evaluated as predictors of initial levels and trajectories of sleep disturbance and DS. RESULTS: All seven General Sleep Disturbance Scale scores were above the cutoff for clinically meaningful levels of sleep disturbance. Lower performance status; higher comorbidity, attentional fatigue, and physical fatigue; and more severe hot flashes predicted higher preoperative levels of sleep disturbance. Higher levels of education predicted higher sleep disturbance scores over time. Higher levels of depressive symptoms predicted higher preoperative levels of sleep disturbance, which declined over time. Lower performance status; higher body mass index; higher fear of future diagnostic tests; not having had sentinel lymph node biopsy; having had an axillary lymph node dissection; and higher depression, physical fatigue, and attentional fatigue predicted higher DS prior to surgery. Higher levels of education, not working for pay, and not having undergone neo-adjuvant chemotherapy predicted higher DS scores over time. CONCLUSION: Sleep disturbance is a persistent problem for patients with breast cancer. The effects of interventions that can address modifiable risk factors need to be evaluated.
    Journal of pain and symptom management 08/2012; · 2.42 Impact Factor
  • Article: Differences in depression, anxiety, and quality of life between women with and without breast pain prior to breast cancer surgery.
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    ABSTRACT: PURPOSE OF THE RESEARCH: Little is known about the relationships between pain, anxiety, and depression in women prior to breast cancer surgery. The purpose of this study was to evaluate for differences in anxiety, depression, and quality of life (QOL) in women who did and did not report the occurrence of breast pain prior to breast cancer surgery. We hypothesized that women with pain would report higher levels of anxiety and depression as well as poorer QOL than women without pain. METHODS AND SAMPLE: A total of 390 women completed self-report measures of pain, anxiety depression, and QOL prior to surgery. KEY RESULTS: Women with preoperative breast pain (28%) were significantly younger, had a lower functional status score, were more likely to be Non-white and to have gone through menopause. Over 37% of the sample reported clinically meaningful levels of depressive symptoms. Almost 70% of the sample reported clinically meaningful levels of anxiety. Patients with preoperative breast pain reported significantly higher depression scores and significantly lower physical well-being scores. No between group differences were found for patients' ratings of state and trait anxiety or total QOL scores. CONCLUSIONS: Our a priori hypotheses were only partially supported. Findings from this study suggest that, regardless of pain status, anxiety and depression are common problems in women prior to breast cancer surgery.
    European journal of oncology nursing: the official journal of European Oncology Nursing Society 08/2012; · 1.13 Impact Factor
  • Article: Trajectories and predictors of symptom occurrence, severity, and distress in prostate cancer patients undergoing radiation therapy.
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    ABSTRACT: Radiation therapy (RT) is a common treatment for prostate cancer. Despite available research, prostate cancer patients report that information about side effects is their most important unmet need. Additional research is needed that focuses on specific dimensions of the patient's symptom experience. The study's purposes were to evaluate the trajectories of occurrence, severity, and distress of the six most prevalent symptoms reported by patients undergoing RT for prostate cancer and the effects of selected demographic and clinical characteristics on these trajectories. Patients completed the Memorial Symptom Assessment Scale 11 times before, during, and after RT. For problems with urination, pain, lack of energy, feeling drowsy, difficulty sleeping, and diarrhea, the trajectories of occurrence, severity, and distress were evaluated using multilevel generalized linear models. Across all three dimensions, pain, lack of energy, feeling drowsy, and difficulty sleeping followed a decreasing linear trend. Problems with urination and diarrhea demonstrated more complex patterns of change over time. Although longitudinal data on pain, lack of energy, feeling drowsy, and difficulty sleeping are limited, they are highly prevalent symptoms in these patients. In addition, diarrhea becomes a significant problem for these patients over the course of RT. A number of demographic and clinical characteristics affect the trajectories of these common symptoms differentially.
    Journal of pain and symptom management 07/2012; 44(4):486-507. · 2.42 Impact Factor
  • Article: Yoga breathing for cancer chemotherapy-associated symptoms and quality of life: results of a pilot randomized controlled trial.
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    ABSTRACT: Many debilitating symptoms arise from cancer and its treatment that are often unrelieved by established methods. Pranayama, a series of yogic breathing techniques, may improve cancer-related symptoms and quality of life, but it has not been studied for this purpose. A pilot study was performed to evaluate feasibility and to test the effects of pranayama on cancer-associated symptoms and quality of life. This was a randomized controlled clinical trial comparing pranayama to usual care. The study was conducted at a university medical center. Patients receiving cancer chemotherapy were randomized to receive pranayama immediately or after a waiting period (control group). The pranayama intervention consisted of four breathing techniques taught in weekly classes and practiced at home. The treatment group received pranayama during two consecutive cycles of chemotherapy. The control group received usual care during their first cycle, and received pranayama during their second cycle of chemotherapy. Feasibility, cancer-associated symptoms (fatigue, sleep disturbance, anxiety, depression, stress), and quality of life were the outcomes. Class attendance was nearly 100% in both groups. Sixteen (16) participants were included in the final intent-to-treat analyses. The repeated-measures analyses demonstrated that any increase in pranayama dose, with dose measured in the number of hours practiced in class or at home, resulted in improved symptom and quality-of-life scores. Several of these associations--sleep disturbance (p=0.04), anxiety (p=0.04), and mental quality of life (p=0.05)--reached or approached statistical significance. Yoga breathing was a feasible intervention among patients with cancer receiving chemotherapy. Pranayama may improve sleep disturbance, anxiety, and mental quality of life. A dose-response relationship was found between pranayama use and improvements in chemotherapy-associated symptoms and quality of life. These findings need to be confirmed in a larger study.
    Journal of alternative and complementary medicine (New York, N.Y.) 04/2012; 18(5):473-9. · 1.69 Impact Factor
  • Article: Associations between pro- and anti-inflammatory cytokine genes and breast pain in women prior to breast cancer surgery.
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    ABSTRACT: The purposes of this study were to determine the occurrence rate for preoperative breast pain; describe the characteristics of this pain; evaluate for differences in demographic and clinical characteristics; and evaluate for variations in pro- and anti-inflammatory cytokine genes between women who did and did not report pain. Patients (n = 398) were recruited prior to surgery and completed self-report questionnaires on a number of pain characteristics. Genotyping was done using a custom genotyping array. Women (28.2%) who reported breast pain were significantly younger (P < .001); more likely to be nonwhite (P = .032); reported significantly lower Karnofsky Performance Status scores (P = .008); were less likely to be postmenopausal (P = .012); and had undergone significantly more biopsies (P = .006). Carriers of the minor allele for a single nucleotide polymorphism in interleukin (IL)1-receptor 1 (IL1R1) (rs2110726) were less likely to report breast pain prior to surgery (P = .007). Carriers of the minor allele for a single nucleotide polymorphism in IL13 (rs1295686) were more likely to report breast pain prior to surgery (P = .019). Findings suggest that breast pain occurs in over a quarter of women who are about to undergo breast cancer surgery. Based on phenotypic and genotypic characteristics found, inflammatory mechanisms contribute to preoperative breast pain. PERSPECTIVE: In women with breast cancer, preoperative pain may be associated with increases in inflammatory responses associated with an increased number of biopsies. In addition, differences in cytokine genes may contribute to this preoperative breast pain.
    The journal of pain: official journal of the American Pain Society 04/2012; 13(5):425-37. · 3.78 Impact Factor
  • Article: Association between pro- and anti-inflammatory cytokine genes and a symptom cluster of pain, fatigue, sleep disturbance, and depression.
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    ABSTRACT: Because multiple symptoms associated with "sickness behavior" have a negative impact on functional status and quality of life, increased information on the mechanisms that underlie inter-individual variability in this symptom experience is needed. The purposes of this study were to determine: if distinct classes of individuals could be identified based on their experience with pain, fatigue, sleep disturbance, and depression; if these classes differed on demographic and clinical characteristics; and if variations in pro- and anti- inflammatory cytokine genes were associated with latent class membership. Self-report measures of pain, fatigue, sleep disturbance, and depression were completed by 168 oncology outpatients and 85 family caregivers (FCs). Using latent class profile analysis (LCPA), three relatively distinct classes were identified: those who reported low depression and low pain (83%), those who reported high depression and low pain (4.7%), and those who reported high levels of all four symptoms (12.3%). The minor allele of IL4 rs2243248 was associated with membership in the "All high" class along with younger age, being White, being a patient (versus a FC), having a lower functional status score, and having a higher number of comorbid conditions. Findings suggest that LPCA can be used to differentiate distinct phenotypes based on a symptom cluster associated with sickness behavior. Identification of distinct phenotypes provides new evidence for the role of IL4 in the modulation of a sickness behavior symptom cluster in oncology patients and their FCs.
    Cytokine 03/2012; 58(3):437-47. · 3.02 Impact Factor
  • Article: The efficacy of the web-based childhood obesity prevention program in Chinese American adolescents (Web ABC study).
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    ABSTRACT: To examine the feasibility and efficacy of a theory-driven and family-based program delivered online to promote healthy lifestyles and weights in Chinese American adolescents. A randomized controlled study of a web-based intervention was developed and conducted in 54 Chinese American adolescents (ages, 12-15 years) and their families. Data on anthropometry, blood pressure, dietary intake, physical activity, and knowledge and self-efficacy regarding physical activity and nutrition were collected at baseline and 2, 6, and 8 months after the baseline assessment. Data were analyzed using linear mixed modeling. The intervention resulted in significant decreases in waist-to-hip ratio and diastolic blood pressure and increases in vegetable and fruit intake, level of physical activity, and knowledge about physical activity and nutrition. This web-based behavior program for Chinese American adolescents and their families seems feasible and effective in the short-term. Long-term effects remain to be determined. This type of program can be adapted for other minority ethnic groups who are at high-risk for overweight and obesity and have limited access to programs that promote healthy lifestyles.
    Journal of Adolescent Health 08/2011; 49(2):148-54. · 3.33 Impact Factor
  • Article: A comparison of the cyclic variation in serum levels of CA125 across the menstrual cycle using two commercial assays.
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    ABSTRACT: Clinicians use CA125, a tumor-associated antigen, primarily to monitor epithelial ovarian cancer. However, CA125 lacks the sensitivity and specificity necessary for population-based screening in healthy women. The purpose of this study was to determine if serum concentrations of CA125 differed across the three phases of the menstrual cycle in healthy, premenopausal women using two commercially available assays. Healthy, Caucasian women between the ages of 18 and 39 were enrolled using strict criteria to exclude factors known to contribute to CA125 fluctuations. Menstrual cycle regularity was determined using calendars maintained by participants for 3 months. After cycle regularity was established, blood was drawn at three time points for CA125 determination using two commercial assays (i.e., Siemens and Panomics). Regardless of the assay used, CA125 values were highest during menses. The CA125 values decreased 0.2 U/ml per day from menses to the end of the same cycle, which resulted in a net decrease of 5.8 U/ml across the cycle. The two commercial assays for CA125 determination demonstrated good concordance in terms of reference ranges regardless of epitope differences. While CA125 levels changed over the course of the menstrual cycle, these changes may not be clinically significant in healthy women. This study is the first to control for factors known to contribute to CA125 elevations; to quantify a decrease in CA125 levels across the menstrual cycle; and to confirm concordance in the relative decreases in serum CA125 levels across the menstrual cycle between two frequently used commercial assays.
    Biological Research for Nursing 07/2011; 14(3):250-6. · 1.28 Impact Factor
  • Article: Sleep-wake circadian activity rhythms and fatigue in family caregivers of oncology patients.
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    ABSTRACT: Little is known about the relationships between sleep/wake circadian activity rhythms and fatigue in family caregivers (FCs) of oncology patients. The objectives of this study were to describe values for nocturnal sleep/rest, daytime wake/activity, and circadian activity rhythm parameters measured using actigraphy and to evaluate the relationships between these subjective and objective measures of sleep disturbance and self-reported fatigue severity, in a sample of FCs of oncology patients. Family caregivers (n = 103) completed self-report measures for sleep disturbance (ie, Pittsburgh Sleep Quality Index, General Sleep Disturbance Scale) and fatigue (Lee Fatigue Scale) and wore wrist actigraphs for 48 hours prior to beginning radiation therapy. Spearman rank correlations were calculated between variables. Approximately 40% to 60% of FCs experienced sleep disturbance depending on whether clinically significant cutoffs for the subjective or objective measures were used to calculate occurrence rates. In addition, these FCs reported moderate levels of fatigue. Only a limited number of significant correlations were found between the subjective and objective measures of sleep disturbance. Significant positive correlations were found between fatigue and subjective, but not objective measures of sleep disturbance. The amplitude of circadian activity rhythm was not related to any objective sleep measure but was correlated with self-report of longer sleep-onset latency. A significant percentage of FCs experience clinically meaningful disturbances in sleep-wake circadian activity rhythms. These disturbances occur primarily in sleep maintenance. Family caregivers need to be assessed, along with patients, for sleep disturbance, and appropriate interventions initiated for them and for the patient.
    Cancer nursing 07/2011; 35(1):70-81. · 1.88 Impact Factor
  • Article: Sleep-wake circadian activity rhythm parameters and fatigue in oncology patients before the initiation of radiation therapy.
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    ABSTRACT: Little is known about the relationships between sleep parameters and fatigue in patients at the initiation of radiation therapy (RT). The objectives of this study were to describe values for nocturnal sleep/rest, daytime wake/activity, and circadian activity rhythm parameters measured using actigraphy and to evaluate the relationships between these objective parameters and subjective ratings of sleep disturbance and fatigue severity, in a sample of patients at the initiation of RT. Patients (n = 185) with breast, prostate, lung, or brain cancer completed self-report measures for sleep disturbance (ie, Pittsburgh Sleep Quality Index, General Sleep Disturbance Scale) and fatigue (Lee Fatigue Scale) and wore wrist actigraphs for a total of 48 hours prior to beginning RT. Actigraphy data were analyzed using the Cole-Kripke algorithm. Spearman rank correlations were calculated between variables. Approximately 30% to 50% of patients experienced sleep disturbance, depending on whether clinically significant cutoffs for the subjective or objective measures were used to calculate occurrence rates. In addition, these patients reported moderate levels of fatigue. Only a limited number of significant correlations were found between the subjective and objective measures of sleep disturbance. Significant positive correlations were found between the subjective, but not the objective measures of sleep disturbance and fatigue. A significant percentage of oncology patients experience significant disturbances in sleep-wake circadian activity rhythms at the initiation of RT. The disturbances occur in both sleep initiation and sleep maintenance. Patients need to be assessed at the initiation of RT for sleep disturbance, so appropriate treatment is initiated.
    Cancer nursing 01/2011; 34(4):255-68. · 1.88 Impact Factor
  • Article: Differences in sleep disturbance parameters between oncology outpatients and their family caregivers.
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    ABSTRACT: This study compared the occurrence rates for and severity ratings of sleep disturbance in patient-family caregiver (FC) dyads. In total, 102 dyads were recruited from two radiation therapy (RT) departments. Patients and their FCs completed the Pittsburgh Sleep Quality Index (PSQI) and the General Sleep Disturbance Scale (GSDS) and wore wrist actigraphs to obtain subjective and objective measures of the occurrence and severity of sleep disturbance at the initiation of RT. Match paired t tests were used to evaluate for dyadic differences. No differences were found in the occurrence of clinically significant levels of sleep disturbance between patients and their FCs that ranged between 40% and 50% using subjective and objective measures. Few differences were found in the severity of any of the sleep-wake parameters between patients and FCs using both the subjective and objective measures of sleep disturbance. The findings from this study suggest that patients with cancer and their FCs experience similar levels of sleep disturbance and that both groups could benefit from interventions that aim to promote restful sleep. In addition to routine and systematic assessment of sleep disturbance by oncology clinicians, interventions are needed that take into account the specific needs of the patient and the FC as well as the potential for partners' sleep patterns to influence one another.
    Journal of Clinical Oncology 01/2011; 29(8):1001-6. · 18.37 Impact Factor
  • Article: The effects of pain, gender, and age on sleep/wake and circadian rhythm parameters in oncology patients at the initiation of radiation therapy.
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    ABSTRACT: To date, no studies have evaluated for differences in subjective and objective measures of sleep disturbance in oncology outpatients with and without pain. This descriptive study, recruited 182 patients from 2 radiation therapy (RT) departments at the time of the patient's simulation visit. Approximately 38% of the sample reported moderate to severe pain (ie, worst pain intensity of 6.2 ± 2.4). After controlling for age, patients in pain reported worse sleep quality and more sleep disturbance using the Pittsburgh Sleep Quality Index. With the General Sleep Disturbance Scale, patients in pain reported poorer sleep quality, increased use of sleep medications, and more daytime sleepiness. In addition using an objective measure of sleep disturbance (ie, actigraphy), significant gender × pain interactions were found for sleep onset latency, percentage of time awake at night, wake duration, total sleep time, and sleep efficiency. While no differences were found in female patients, males in pain had worse scores than males without pain. Findings from this study suggest that pain and sleep disturbance are prevalent in oncology outpatients and that a patient's age and gender need to be considered in any evaluation of the relationship between pain and sleep. PERSPECTIVE: The effects of pain on subjective and objective sleep parameters appear to be influenced by both patients' age and gender.
    The journal of pain: official journal of the American Pain Society 12/2010; 12(3):390-400. · 3.78 Impact Factor
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    Article: Upper extremity impairments in women with or without lymphedema following breast cancer treatment.
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    ABSTRACT: Breast-cancer-related lymphedema affects approximately 25% of breast cancer (BC) survivors and may impact use of the upper limb during activity. The purpose of this study is to compare upper extremity (UE) impairment and activity between women with and without lymphedema after BC treatment. 144 women post BC treatment completed demographic, symptom, and Disability of Arm-Shoulder-Hand (DASH) questionnaires. Objective measures included Purdue pegboard, finger-tapper, Semmes-Weinstein monofilaments, vibration perception threshold, strength, range of motion (ROM), and volume. Women with lymphedema had more lymph nodes removed (p < .001), more UE symptoms (p < .001), higher BMI (p = .041), and higher DASH scores (greater limitation) (p < .001). For all participants there was less strength (elbow flexion, wrist flexion, grip), less shoulder ROM, and decreased sensation at the medial upper arm (p < .05) in the affected UE. These differences were greater in women with lymphedema, particularly in shoulder abduction ROM (p < .05). Women with lymphedema had bilaterally less elbow flexion strength and shoulder ROM (p < .05). Past diagnosis of lymphedema, grip strength, shoulder abduction ROM, and number of comorbidities contributed to the variance in DASH scores (R (2) of 0.463, p < .001). UE impairments are found in women following treatment for BC. Women with lymphedema have greater UE impairment and limitation in activities than women without. Many of these impairments are amenable to prevention measures or treatment, so early detection by health care providers is essential.
    Journal of Cancer Survivorship 04/2010; 4(2):167-78. · 2.63 Impact Factor
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    Article: An evaluation of the factors that affect the health-related quality of life of children following myelosuppressive chemotherapy.
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    ABSTRACT: The purposes of this study, in children who were assessed 1 week after the administration of myelosuppressive chemotherapy were: to compare the total and subscale scores on a generic measure of health-related quality of life (HRQOL) to normative data from healthy children and describe the relationships between demographic, clinical, and symptom characteristics of children with cancer and generic and disease-specific dimensions of HRQOL. Patients (n = 61) were predominantly male (52.5%), minority (63.9%), and 14.7 years of age. Children completed the Memorial Symptom Assessment Scale for 10- to 18-year olds, the PedsQL™ Generic and Cancer Modules, and the Karnofsky Performance Status (KPS) scale 1 week after the start of a chemotherapy cycle. The mean number of symptoms per patient was 10.6. Compared with the normative sample, children with cancer reported significantly lower scores for the total scale and all of the subscales except emotional and social functioning. No significant differences were found between any demographic characteristics and total or subscale scores on the generic or disease-specific measures of HRQOL. Lower KPS scores were associated with poorer generic and disease-specific HRQOL scores. In addition, a higher number of symptoms was associated with poorer generic and disease-specific HRQOL scores. Finally, higher symptom distress scores were associated with poorer generic and disease-specific HRQOL scores. Among the demographic, clinical, and symptom characteristics studied, poorer functional status and higher symptom burden were associated with significant decreases in HRQOL in children who received myelosuppressive chemotherapy.
    Supportive Care in Cancer 02/2010; 19(3):353-61. · 2.09 Impact Factor
  • Article: A randomized clinical trial of the effectiveness of photon stimulation on pain, sensation, and quality of life in patients with diabetic peripheral neuropathy.
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    ABSTRACT: Peripheral neuropathy is one of the most common complications of diabetes. The purpose of this study was to evaluate the effects of photon stimulation on pain intensity, pain relief, pain qualities, sensation and quality of life (QOL) in patients with painful diabetic peripheral neuropathy. In this randomized, placebo-controlled trial, patients were assigned to receive either four photon stimulations (n=63) or four placebo (n=58) treatments. Pain intensity, pain relief, and pain qualities were assessed using self-report questionnaires. Sensation was evaluated using monofilament testing. QOL was measured using the Medical Outcomes Study Short Form-36 (SF-36). Multilevel regression model analyses were used to evaluate between-group differences in study outcomes. No differences, over time, in any pain intensity scores (i.e., pain intensity immediately post-treatment, average pain, worst pain) or pain relief scores were found between the placebo and treatment groups. However, significant decreases, over time, were found in some pain quality scores, and significant improvements in sensation were found in patients who received the photon stimulation compared with placebo. In addition, patients in the treatment group reported significant improvements in SF-36 social functioning and mental health scores. Findings from a responder analysis demonstrated that no differences were found in the percentages of patients in the placebo and treatment groups who received 30% or more or 50% or more reduction in pain scores immediately post-treatment. However, significant differences were found in the distribution of the changes in pain relief scores, with most of the patients in the photon stimulation group reporting a slight (28.6%) to moderate (34.9%) improvement in pain relief from the beginning to the end of the study compared with no change in pain relief (43.1%) in the placebo group. Four treatments with photon stimulation resulted in significant improvements in some pain qualities, sensation, and QOL outcomes in a sample of patients with a significant amount of pain and disability from their diabetes. A longer duration study is needed to further refine the photon stimulation treatment protocol in these chronically ill patients and to evaluate the sustainability of its effects.
    Journal of pain and symptom management 11/2009; 39(1):88-99. · 2.42 Impact Factor
  • Article: Differences in symptom clusters identified using occurrence rates versus symptom severity ratings in patients at the end of radiation therapy.
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    ABSTRACT: The purposes of this study were to identify the number and types of symptom clusters using yes/no responses from the Memorial Symptom Assessment Scale, identify the number and types of symptom clusters using severity scores from the Memorial Symptom Assessment Scale, compare the identified symptom clusters derived using severity scores to those derived using occurrence ratings, and evaluate for differences in symptom cluster severity scores between patients with breast and prostate cancer at the end of radiation therapy. Separate exploratory factor analyses were performed to determine the number of symptom clusters based on symptom occurrence rates and symptom severity ratings. Although specific symptoms within each symptom cluster were not identical, 3 very similar symptom clusters (ie, "mood-cognitive" symptom cluster, "sickness-behavior" symptom cluster, "treatment-related" symptom cluster) were identified regardless of whether occurrence rates or severity ratings were used to create the symptom clusters at the end of radiation therapy. However, the factor solution derived using the severity ratings fit the data better. Significant differences in severity scores for all 3 symptom clusters were found between patients with breast and prostate cancer. For all 3 symptom clusters, the patients with breast cancer had higher symptom cluster severity scores than the patients with prostate cancer.
    Cancer nursing 10/2009; 32(6):429-36. · 1.88 Impact Factor
  • Article: Does health service use in a diabetes management program contribute to health disparities at a facility level? Optimizing resources with demographic predictors.
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    ABSTRACT: The objective of this study was to determine if demographic variation in the use of health service resources among type 2 diabetes patients contributes to health disparities. A prospective cohort design was used to analyze differences in health care utilization among 315 adults registered in primary care internal medicine clinics of an academic medical center. Patients were cared for by interdisciplinary teams of internal medicine residents, nurse practitioner students, and pharmacy students supervised by interdisciplinary faculty. A post hoc multivariate repeated measures analysis, using generalized estimating equation (GEE) statistical modeling, was used to determine if age, sex, race, ethnicity, marital status, primary language, and insurance predicted use of health care services (ie, primary care, acute care, emergency department [ED], hospitalization). Medicare/Medicaid-insured patients had an average of 2.49 primary care visits per month (P < .0001) and 75% more ED visits (P < .001) during the study than patients with other insurance types. ED visits for Hispanics grew by a factor of 3.3 compared to non-Hispanics (P < .0001). Females had 52% more hospitalizations than males (P < .05), and Hispanics had 44% fewer hospitalizations than non-Hispanics (P < .05). Analysis of selected health status indicators showed no significant differences for HbA1c, significantly greater likelihood of blood pressure >130/80 with every 5-year increase in age, and significantly greater likelihood of low-density lipoprotein >100 among Medicare/Medicaid-insured patients. Sociodemographic characteristics are predictive of health care services use and suggest that, although equally available to all participants, the use of health care resources vary at the facility level and are independent of diabetes health status outcomes.
    Population Health Management 06/2009; 12(3):139-47. · 1.02 Impact Factor
  • Article: Preliminary evidence of a genetic association between tumor necrosis factor alpha and the severity of sleep disturbance and morning fatigue.
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    ABSTRACT: Although fatigue and sleep disturbance are prevalent symptoms in oncology patients and their family caregivers, little is known about the factors that contribute to interindividual variability in symptom severity ratings as well as in their underlying biological mechanisms. In this study, we sought to determine whether a functional genetic variation in a prominent proinflammatory cytokine, tumor necrosis factor-alpha (TNFA-308G>A [rs1800629] promoter polymorphism) was associated with overall ratings of sleep disturbance and fatigue as well as with the trajectories of these symptoms. Over 6 months, participants completed standardized measures of sleep disturbance and fatigue. Multiple linear regression was used to assess the effect of the TNFA genotype and other covariates on mean sleep disturbance and fatigue scores. Hierarchical linear modeling was used to determine the effect of TNFA genotype on the trajectories of these symptoms. Common allele homozygotes reported higher levels of sleep disturbance (p=.09) and morning fatigue (p=.02) than minor allele carriers. Multivariate analyses demonstrated that age and genotype were predictors of both mean symptom scores and the trajectories of these symptoms. Findings provide preliminary evidence of an association between a functional promoter polymorphism in the TNFA gene and the severity of sleep disturbance and morning fatigue in oncology patients and their family caregivers.
    Biological Research for Nursing 05/2009; 11(1):27-41. · 1.28 Impact Factor