Chronic disease in the Childhood Cancer Survivor Study cohort: a review of published findings

Update on endocrine and metabolic therapy-related late effects observed in survivors of childhood neoplasia

PURPOSE OF REVIEW

To provide a summary of the most recent research pertaining to the endocrine and metabolic complications observed in childhood cancer survivors.

RECENT FINDINGS

Data on prevalence and risk associations are increasingly available from large cohorts of childhood cancer survivors. New directions in research include novel risk-prediction strategies and the study of genetic predisposition.

SUMMARY

Endocrine complications are observed in more than 50% of adult childhood cancer survivors. Some continue to develop decades following cancer treatment exposures. The present review provides a summary of the most recent outcomes research pertaining to growth, thyroid, gonadal-reproductive, bone and body composition with emphasis on new directions and challenges in each area.

Survivors of childhood and adolescent cancer: life-long risks and responsibilities

Survival rates for most paediatric cancers have improved at a remarkable pace over the past four decades. In developed countries, cure is now the probable outcome for most children and adolescents who are diagnosed with cancer: their 5-year survival rate approaches 80%. However, the vast majority of these cancer survivors will have at least one chronic health condition by 40 years of age. The burden of responsibility to understand the long-term morbidity and mortality that is associated with currently successful treatments must be borne by many, including the research and health care communities, survivor advocacy groups, and governmental and policy-making entities.

A report from the 2013 international workshop: radiation and cardiovascular disease, Hiroshima, Japan

Two longitudinal cohort studies of Japanese atomic bomb survivors-the life span study (LSS) and the adult health study (AHS)-from the Radiation Effects Research Foundation (RERF) indicate that total body irradiation doses less than 1 Gy are associated with an increased risk of cardiovascular disease (CVD), but several questions about this association remain.In particular, the diversity of heart disease subtypes and the high prevalence of other risk factors complicate the estimates of radiation effects. Subtype-specific analyses with more reliable diagnostic criteria and measurement techniques are needed. The radiation effects on CVD risk are probably tissue-reaction (deterministic) effects, so the dose-response relationships for various subtypes of CVD may be nonlinear and therefore should be explored with several types of statistical models.Subpopulations at high risk need to be identified because effects at lower radiation doses may occur primarily in these susceptible subpopulations. Whether other CVD risk factors modify radiation effects also needs to be determined. Finally, background rates for various subtypes of CVD have historically differed substantially between Japanese and Western populations, so the generalisability to other populations needs to be examined.Cardiovascular disease mechanisms and manifestations may differ between high-dose local irradiation and low-dose total body irradiation (TBI)-microvascular damage and altered metabolism from low-dose TBI, but coronary artery atherosclerosis and thrombotic myocardial infarcts at high localised doses. For TBI, doses to organs other than the heart may be important in pathogenesis of CVD, so data on renal and liver disorders, plaque instability, microvascular damage, metabolic disorders, hypertension and various CVD biomarkers and risk factors are needed. Epidemiological, clinical and experimental studies at doses of less than 1 Gy are necessary to clarify the effects of radiation on CVD risk.

The need for evidence based nutritional guidelines for pediatric acute lymphoblastic leukemia patients: acute and long-term following treatment

High survival rates for pediatric leukemia are very promising. With regard to treatment, children tend to be able to withstand a more aggressive treatment protocol than adults. The differences in both treatment modalities and outcomes between children and adults make extrapolation of adult studies to children inappropriate. The higher success is associated with a significant number of children experiencing nutrition-related adverse effects both in the short and long term after treatment. Specific treatment protocols have been shown to deplete nutrient levels, in particular antioxidants. The optimal nutrition prescription during, after and long-term following cancer treatment is unknown. This review article will provide an overview of the known physiologic processes of pediatric leukemia and how they contribute to the complexity of performing nutritional assessment in this population. It will also discuss known nutrition-related consequences, both short and long term in pediatric leukemia patients. Since specific antioxidants have been shown to be depleted as a consequence of therapy, the role of oxidative stress in the pediatric leukemia population will also be explored. More pediatric studies are needed to develop evidence based therapeutic interventions for nutritional complications of leukemia and its treatment.

Physical Activity in Adolescents following Treatment for Cancer: Influencing Factors

The purpose of this study was to examine physical activity levels and influencing individual and environmental factors in a group of adolescent survivors of cancer and a comparison group. Methods. The study was conducted using a "mixed methods" design. Quantitative data was collected from 48 adolescent survivors of cancer and 48 comparison adolescents using the Godin Leisure-Time Exercise Questionnaire, the Fatigue Scale-Adolescents, and the Amherst Health and Activity Study-Student Survey. Qualitative data was collected in individual semistructured interviews. Results. Reported leisure-time physical activity total scores were not significantly different between groups. Physical activity levels were positively correlated with adult social support factors in the group of adolescent survivors of cancer, but not in the comparison group. Time was the primary barrier to physical activity in both groups. Fatigue scores were higher for the comparison but were not associated with physical activity levels in either group. The qualitative data further supported these findings. Conclusions. Barriers to physical activity were common between adolescent survivors of cancer and a comparative group. Increased knowledge of the motivators and barriers to physical activity may help health care providers and families provide more effective health promotion strategies to adolescent survivors of pediatric cancer.

Can intensity of long-term follow-up for survivors of childhood and teenage cancer be determined by therapy-based risk stratification?

OBJECTIVE

To determine the feasibility of therapy-based, risk-stratified follow-up guidelines for childhood and teenage cancer survivors by evaluating adverse health outcomes in a survivor cohort retrospectively assigned a risk category.

DESIGN

Retrospective cohort study.

SETTING

Tertiary level, single centre, paediatric cancer unit in South East Scotland.

PARTICIPANTS

All children and teenagers diagnosed with cancer (<19 years) between 1 January 1971 and 31 July 2004, who were alive more than 5 years from diagnosis formed the study cohort. Each survivor was retrospectively assigned a level of follow-up, based on their predicted risk of developing treatment-related late effects (LEs; levels 1, 2 and 3 for low, medium and high risk, respectively). Adverse health outcomes were determined from review of medical records and postal questionnaires. LEs were graded using the Common Terminology Criteria for Adverse Event, V.3.

RESULTS

607 5-year survivors were identified. Risk stratification identified 86 (14.2%), 271 (44.6%) and 250 (41.2%) as levels 1, 2 and 3 survivors, respectively. The prevalence of LEs for level 1 survivors was 11.6% with only one patient with grade 3 or above toxicity. 35.8% of level 2 survivors had an LE, of whom 9.3%, 58.8%, 18.5%, 10.3% and 3% had grades 1, 2, 3, 4 and 5 toxicity, respectively. 65.2% of level 3 survivors had LE, of whom 5.5% (n=9), 34.4% (n=56), 36.2% (n=59), 22.1% (n=36) and 1.8% (n=3) had grades 1, 2, 3, 4 and 5 toxicity, respectively.

CONCLUSIONS

Therapy-based risk stratification of survivors can predict which patients are at significant risk of developing moderate-to-severe LEs and require high-intensity long-term follow-up. Our findings will need confirmation in a prospective cohort study that has the power to adjust for all potentially confounding variables.

Understanding cardiovascular injury after treatment for cancer: an overview of current uses and future directions of cardiovascular magnetic resonance

While cancer-free survival has improved over the past 20 years for many individuals with prostate, renal, breast, and hematologic malignancies, the increasingly recognized prevalence of cardiovascular (CV) events in cancer survivors has been an unintended consequence of many of the therapies that have improved these survival rates. The increase in CV events threatens to offset the improvement in cancer related survival. As a result, there is an emerging need to develop methods to identify those individuals treated for cancer at increased risk of cardiovascular events. With its inherent ability to characterize myocardial tissue and identify both cardiac and vascular dysfunction, cardiovascular magnetic resonance (CMR) has the potential to identify both subclinical and early clinical CV injury before the development of an overt catastrophic event such as a myocardial infarction, stroke, or premature cardiac death. Early identification provides an opportunity for the implementation of primary prevention strategies to prevent such events, thereby improving overall cancer survivorship and quality of life. This article reviews the etiology of CV events associated with cancer therapy and the unique potential of CMR to provide early diagnosis of subclinical CV injury related to the administration of these therapies.

Self-reported psychosocial wellbeing of adolescent childhood cancer survivors

PURPOSE

To describe self-reported psychosocial wellbeing of adolescent childhood cancer survivors (CCS) compared with a control group of their peers.

METHODS

In this case-control study, 170 CCS aged 12-18 years completed an internet survey. The survey was a modified version of the Youth'07 Health and Wellbeing Survey of Secondary School Students in New Zealand. The control group (historical comparison) were the 9107 Youth'07 survey participants. Psychosocial wellbeing was assessed by measures of a) wellbeing (WHO-5), b) anxiety (MASC-10), c) depression (RADS2-SF) and d) emotional and behavioural difficulties (SDQ).

RESULTS

The majority of CCS scored within the normal range across all four measures: wellbeing (89%), anxiety (93%), depression (94%) and emotional and behavioural difficulties (82%), leaving a small but important minority of CCS reporting significant clinical issues. Compared to their peers, adolescent CCS were no more likely to have an abnormal score for any of the psychosocial measures, and less likely to report abnormal psychosocial wellbeing (OR = 0.44, p = 0.0003) and prosocial behaviour problems (OR = 0.53, p = 0.009). Survivors of central nervous system tumours, older age, older age at diagnosis, and lower socioeconomic status were associated with some psychosocial difficulty.

CONCLUSIONS

Following a diagnosis of childhood cancer, intensive therapy, and the subsequent risk of adverse health outcomes, one might expect CCS to be doing less well than their peers in terms of psychosocial wellbeing. The findings of this study, however, show that CCS are doing as well, and in some respects better, than their peers.

Immunotherapy for pediatric leukemia

Substantial progress has been made in the treatment of leukemia in childhood. Despite this, leukemia remains a leading cause of pediatric cancer-related mortality and the prognosis is guarded for individuals with relapsed or refractory disease. Standard therapies are associated with a wide array of acute and long-term toxicities and further treatment intensification may not be tolerable or beneficial. The curative potential of allogeneic stem cell transplantation is due in part to the graft-versus-leukemia effect, which provides evidence for the therapeutic capacity of immune-based therapies. In recent years there have been significant advances in the development and application of immunotherapy in the treatment of leukemias, including the demonstration of activity in chemotherapy-resistant cases. This review summarizes immunotherapeutic approaches in the treatment of pediatric leukemia including current results and future directions.

Children's Oncology Group's 2013 blueprint for research: survivorship and outcomes

Improvements in the treatment of childhood cancer have resulted in over 360,000 survivors of childhood cancer in the U.S. There is now a heightened recognition of the need to reduce treatment-related sequelae and optimize the quality of life of children treated for cancer. Survivorship studies conducted in the cooperative group setting have provided us with important information on long-term intellectual function, organ toxicity, reproductive outcomes, second cancers, late mortality, and disparities in outcomes. Ongoing health education initiatives have helped standardize the follow-up care for childhood cancer survivors and facilitate the early transfer of health-related information to patients, families, and healthcare providers.

New health conditions identified at a regional childhood cancer survivor clinic visit

BACKGROUND

Specialty childhood cancer survivorship clinics have been established to screen for potential treatment-related effects. Given the limited empirical data regarding the merit of survivorship clinics, we assessed the frequencies of newly identified, therapy-related effects in survivors who attended Health, Education, Research, Outcomes for Survivors (HEROS) clinic at Yale during 2003-2009.

PROCEDURE

A total of 213 survivors in remission, who were diagnosed with cancer at an age ≤21 years and were ≥3 years after cancer diagnosis, underwent screening based on cancer treatment exposures according to the children's oncology group long-term follow-up guidelines. The frequencies and associated factors of newly identified health conditions were determined. Odds ratios (OR) and their 95% confidence intervals were estimated using multivariate regression models with stepwise selection.

RESULTS

Prior to the HEROS clinic visit, 49% of patients had at least one previously known late complication of therapy. After the visit, a total of 98 new health conditions were identified in 73 patients (34%). Newly identified complications in screened patients included pulmonary dysfunction (23%), endocrinopathy (19%), osteoporosis (17%), dyslipidemia (8%), neurologic impairment (4%), cardiovascular deficit (3%) and subsequent cancer (3%). Age at cancer diagnosis (OR = 1.06 [1.00-1.11]), chest irradiation (OR = 2.92 [1.58-5.40]), and history of ≥1 other treatment-related complication(s) (OR = 2.20 [1.18-4.07]) were associated with a higher likelihood of having new conditions identified.

CONCLUSION

Risk-based screening at a specialty childhood cancer survivor clinic detected a substantial number of previously unrecognized, treatment-related health complications in a group of survivors already receiving regular medical care elsewhere.

Increased uptake of social security benefits among long-term survivors of cancer in childhood, adolescence and young adulthood: a Norwegian population-based cohort study

BACKGROUND

As the number of cancer survivors increases, their health and welfare have come into focus. Thus, long-term medical consequences of cancer at a young age (<25 years), obtained from social security benefit records, were studied.

METHODS

Standardised incidence ratios (SIRs) of long-term medical consequences for 5-year cancer survivors, born during 1965-1985, were explored by linking population-based registries in Norway.

RESULTS

Among the 5-year cancer survivors (4031 individuals), 29.7% received social security benefits. The survivors had an overall 4.4 times (95% confidence interval (95% CI): 4.1-4.6) higher risk of social security benefit uptake than the cancer-free population. Survivors of malignancies of bone and connective tissues (SIR: 10.8; 95% CI: 9.1-12.9), CNS tumours (SIR: 7.7; 95% CI: 6.9-8.6) and malignancies of the haematopoietic system (SIR: 6.1; 95% CI: 5.3-7.0) had the highest risks of social security benefits uptake. The most notified causes of social security benefit uptake were diseases of the nervous system, and injury and poisoning.

CONCLUSION

The uptake of social security benefits among 5-year cancer survivors increased substantially and it may represent a solid outcome measure for the burden of the most severe late effects, especially in countries with comparable social welfare systems.

Endocrine health conditions in adult survivors of childhood cancer: the need for specialized adult-focused follow-up clinics

BACKGROUND

Survival rates among childhood cancer survivors (CCS) have enormously increased in the last 40 years. However, this improvement has been achieved at the expense of serious late effects that frequently involve the endocrine system.

AIM

To evaluate the cumulative incidence of endocrine diseases in a cohort of long-term CCS.

MATERIALS AND METHODS

We analyzed the clinical data of 310 adults, followed for a median time of 16.0 years after the first cancer diagnosis. The monitoring protocols applied to each patient were personalized on the basis of cancer diagnosis and previous treatments, according to the Children's Oncology Group guidelines.

RESULTS

The cumulative incidence of endocrine late effects steadily increased over time. At the last follow-up visit available, 48.46% of females and 62.78% of males were affected by at least one endocrine disease. The most common disorders were gonadal dysfunction, primary hypothyroidism, and GH deficiency (GHD). The main risk factors for endocrine disease were male sex (hazard ratio (HR)=1.45, 95% confidence interval (95% CI) 1.05-1.99), radiotherapy (HR=1.91, 95% CI 1.28-2.84), hematopoietic stem cells transplantation (HR=3.11, 95% CI 2.23-4.34), and older age at cancer diagnosis (HR=1.89, 95% CI 1.25-2.85). Male sex was associated with a higher risk of gonadal disorders, whereas radiotherapy specifically increased the risk of GHD and thyroid dysfunction.

CONCLUSIONS

Endocrine disorders among CCS have a high prevalence and increase over time. Thus, endocrinologists need to cope with an increasing demand for health care in a field that is still little developed and that, in perspective, could also be extended to some selected types of adult cancer survivors.

Reduced-dose craniospinal radiotherapy followed by tandem high-dose chemotherapy and autologous stem cell transplantation in patients with high-risk medulloblastoma

BACKGROUND

We assessed the feasibility and effectiveness of reduced-dose craniospinal (CS) radiotherapy (RT) followed by tandem high-dose chemotherapy and autologous stem cell transplantation (HDCT/autoSCT) in reducing late adverse effects without jeopardizing survival among children with high-risk medulloblastoma (MB).

METHODS

From October 2005 through September 2010, twenty consecutive children aged >3 years with high-risk MB (presence of metastasis and/or postoperative residual tumor >1.5 cm(2)) were assigned to receive 2 cycles of pre-RT chemotherapy, CSRT (23.4 or 30.6 Gy) combined with local RT to the primary site (total 54.0 Gy), and 4 cycles of post-RT chemotherapy followed by tandem HDCT/autoSCT. Carboplatin-thiotepa-etoposide and cyclophosphamide-melphalan regimens were used for the first and second HDCT, respectively.

RESULTS

Of 20 patients with high-risk MB, 17 had metastatic disease and 3 had a postoperative residual tumor >1.5 cm(2) without metastasis. The tumor relapsed/progressed in 4 patients, and 2 patients died of toxicities during the second HDCT/autoSCT. Therefore, 14 patients remained event-free at a median follow-up of 46 months (range, 23-82) from diagnosis. The probability of 5-year event-free survival was 70.0% ± 10.3% for all patients and 70.6% ± 11.1% for patients with metastases. Late adverse effects evaluated at a median of 36 months (range, 12-68) after tandem HDCT/autoSCT were acceptable.

CONCLUSIONS

In children with high-risk MB, CSRT dose might be reduced when accompanied by tandem HDCT/autoSCT without jeopardizing survival. However, longer follow-up is needed to evaluate whether the benefits of reduced-dose CSRT outweigh the long-term risks of tandem HDCT/autoSCT.

Malnutrition and obesity in pediatric oncology patients: causes, consequences, and interventions

In children with cancer, suboptimal nutrition states are common consequences of the disease and its treatment. These nutrition states have been attributed to a number of etiologies dependent on the patient's tumor type and treatment, and are associated with increased morbidity and mortality. Interventions vary from psychosocial to pharmacological and surgical management. Further research is necessary to understand the epidemiology and etiology of these nutrition states. Of great importance is the development and implementation of effective interventions to optimize nutritional status among children with cancer during and after therapy.

Yield of screening for long-term complications using the children's oncology group long-term follow-up guidelines

PURPOSE

The Children's Oncology Group Long-Term Follow-Up (COG-LTFU) Guidelines use consensus-based recommendations for exposure-driven, risk-based screening for early detection of long-term complications in childhood cancer survivors. However, the yield from these recommendations is not known.

METHODS

Survivors underwent COG-LTFU Guideline-directed screening. Yield was classified as negligible/negative (< 1%), intermediate (≥ 1% to < 10%), or high (≥ 10%). For long-term complications with high yield, logistic regression was used to identify subgroups more likely to screen positive.

RESULTS

Over the course of 1,188 clinic visits, 370 childhood cancer survivors (53% male; 47% Hispanic; 69% leukemia/lymphoma survivors; median age at diagnosis, 11.1 years [range, 0.3 to 21.9 years]; time from diagnosis, 10.5 years [range, 5 to 55.8 years]) underwent 4,992 screening tests. High-yield tests included thyroid function (hypothyroidism, 10.1%), audiometry (hearing loss, 22.6%), dual-energy x-ray absorptiometry scans (low bone mineral density [BMD], 23.2%), serum ferritin (iron overload, 24.0%), and pulmonary function testing/chest x-ray (pulmonary dysfunction, 84.1%). Regression analysis failed to identify subgroups more likely to result in high screening yield, with the exception of low BMD (2.5-fold increased risk for males [P = .04]; 3.3-fold increased risk for nonobese survivors [P = .01]). Screening tests with negligible/negative (< 1%) yield included complete blood counts (therapy-related leukemia), dipstick urinalysis for proteinuria and serum blood urea nitrogen/creatinine (glomerular defects), microscopic urinalysis for hematuria (hemorrhagic cystitis, bladder cancer), ECG (anthracycline-related conduction disorder), and hepatitis B and HIV serology.

CONCLUSION

Screening tests with a high yield are appropriate for risk groups targeted for screening by the COG-LTFU Guidelines. Elimination of screening tests with negligible/negative yield should be given consideration.

Nutritional status of children and young adults with Ewing sarcoma or osteosarcoma at diagnosis and during multimodality therapy

OBJECTIVE

Objective of our study was to evaluate the nutritional status and growth of children and adolescents with common malignancies of the musculoskeletal system at diagnosis, and undergoing multimodality therapy.

METHODS

A retrospective analysis of data from 2001 to 2009 was conducted. Hospital charts were used as a source of clinical data. Primary endpoint of the analyses was to identify variations in anthropometric parameters at diagnosis and during the first 2 years of follow-up in children and adolescents with osteosarcoma or Ewing sarcoma. Factors contributing to disorders of growth in this population were sought.

RESULTS

A total of 139 children were registered, 62 with Ewing sarcoma and 77 with osteosarcoma. At diagnosis 72.7% of all patients were classified as adequately nourished (BMI 5th to <85th percentiles). During treatment all anthropometric parameters were markedly reduced (P < 0.001) in both groups with extreme changes in body weight from -30% to +44%. This was pronounced in children affected by osteosarcoma (P < 0.05). During follow-up, recovery of body weight was noted in both groups. Height Z-scores remained low (P < 0.001) in comparison to the general population. After the observation period 43.4% of the children with osteosarcoma and 25.5% of the patients with Ewing sarcoma demonstrated an altered body mass.

CONCLUSIONS

Pediatric patients with Ewing sarcoma or osteosarcoma are at an increased risk for developing malnutrition, in the form of either over- or underweight during multimodality therapy. Early recognition of abnormal body mass is required to prevent and to treat long-term comorbidities caused by malnutrition.

A case report of simultaneous occurrence of Wilms tumor and acute lymphoblastic leukemia

Acute lymphoblastic leukemia (ALL) is the most and Wilms tumor is the sixth most common malignancy in childhood. Genetic changes in WT1 or WT2 in Wilms tumor and a wide range of chromosomal mutations are reported in ALL that may predispose them to other congenital anomalies especially in Wilms tumor patients. Hospitalized patient was a 3-year-old girl with high-grade fever, petechia, and solid abdominal mass. The patient had anemia, thrombocytopenia, and leukocytosis in her initial homogram, and a large renal mass originated from left kidney in abdominal imagings. Bone marrow aspiration revealed ALL, and simultaneous kidney biopsy uncovered her Wilms tumor. Leukemia and Wilms tumor are 2 independent malignancies but occurred together in this patient. It is reasonable to investigate cellular and genetic relation of these 2 independent malignancies.

Radiotherapy-induced hypopituitarism: a review

Hypopituitarism is a disorder caused by impaired hormonal secretions from the hypothalamic-pituitary axis. Radiotherapy is the most common cause of iatrogenic hypopituitarism. The hypothalamic-pituitary axis inadvertently gets irradiated in patients receiving prophylactic cranial radiotherapy for leukemia, total body irradiation and radiotherapy for intracranial, base skull, sinonasal and nasopharyngeal tumors. Radiation-induced hypopituitarism (RIH) is insidious, progressive and largely nonreversible. Mostly, RIH involves one hypothalamic-pituitary axis; however, multiple hormonal axes deficiency starts developing at higher doses. Although the clinical effects of the hypopituitarism are more profound in children and young adults, its implications in older adults are being increasingly recognized. The risk continues to persist or increase up to 10 years following radiation exposure. The clinical management of hypopituitarism is challenging both for the patients and healthcare providers. Here we have reviewed the scale of the problem, the risk factors and the management of RIH.

Childhood Cancer Survivor Study participants' perceptions and knowledge of health insurance coverage: implications for the Affordable Care Act

INTRODUCTION

Childhood cancer survivors face long-term health consequences, and comprehensive health insurance is critical. However, childhood cancer survivors may face barriers in accessing medical services due to being uninsured or underinsured. Little is known about the quality of survivors' health insurance coverage, and improving health insurance within the context of changes mandated by the 2010 Affordable Care Act requires understanding survivors' coverage. The current study explored adult childhood cancer survivors' quality of health insurance coverage.

METHODS

From 9/09 to 2/10, we conducted in-depth, semistructured qualitative interviews with 39 adult participants from the Childhood Cancer Survivor Study, a cohort of 5-year survivors of cancers diagnosed before age 21. Interviews were recorded and transcribed; content analyses were conducted by two coders (kappa = 0.88) using NVivo 8.

RESULTS

Most insured survivors reported satisfaction with the quality of their coverage; however, they expressed low expectations. Almost half reported annual out-of-pocket costs exceeding $2,000, yet most felt fortunate to simply have coverage. One third of insured survivors had difficulty obtaining coverage, and many had difficulties understanding how to utilize it. Most uninsured survivors minimized their need for care. Worry about future health care costs seemed inevitable among insured and uninsured survivors. Almost all participants lacked knowledge about existing health insurance-related laws.

CONCLUSIONS AND IMPLICATIONS FOR CANCER SURVIVORS

Insured survivors had low coverage expectations, and uninsured survivors avoided care. Childhood cancer survivors will likely benefit from assistance in how to access and utilize the new health care reform provisions (e.g., Medicaid expansion, expansion of parents' insurance, and mandatory primary care coverage).

Hospitalization rates among survivors of childhood cancer in the Childhood Cancer Survivor Study cohort

BACKGROUND

Chronic health conditions are common among long-term childhood cancer survivors, but hospitalization rates have not been reported. The objective of this study was to determine overall and cause-specific hospitalization rates among survivors of childhood cancer and compare rates to the U.S. population.

PROCEDURE

The Childhood Cancer Survivor Study (CCSS) is a retrospective cohort of 5+ year survivors of childhood malignancies treated at 26 participating centers. Self-reported hospitalizations from 10,366 survivors (diagnosed 1970-1986) were compared to U.S. population rates using age- and sex-stratified standardized incidence ratios (SIRs). Reasons for hospitalization were evaluated and associations between demographic, cancer and treatment-related risk factors with hospitalization were investigated.

RESULTS

Survivors were, on average, 20.9 years from cancer diagnosis (SD: 4.6, range: 13-32) and 28.6 years of age (SD: 7.7, range: 13-51). Survivor hospitalization rates were 1.6 times the U.S. population (95% CI: 1.6; 1.7). Increased hospitalization rates were noted irrespective of gender, age at follow-up and cancer diagnosis, with highest SIRs noted among male (SIR = 2.6, 95% CI: 2.2; 3.0) and female (SIR = 2.7, 95% CI: 2.4; 3.1) survivors aged 45-54. Female gender, an existing chronic health condition and/or a second neoplasm, and prior treatment with radiation were associated with an increased risk of non-obstetrical hospitalization.

CONCLUSIONS

Survivors of childhood cancer demonstrate substantially higher hospitalization rates. Additional research is needed to further quantify the healthcare utilization and economic impact of treatment-related complications as this population ages.

Late effects in adult survivors of pediatric cancer: a guide for the primary care physician

Because of significant medical advances in the past 50 years, the number of adult survivors of childhood/adolescent cancer has increased dramatically. Unfortunately, more than 60% of these survivors will have at least 1 long-term side effect from treatment. This growing population requires dedicated care by their primary physicians because they have specific risk factors depending on their initial cancer diagnosis and the treatment modalities they received. Internists and family physicians play an integral role in providing appropriate screening, treatment, and counseling to prevent morbidity and mortality in these patients.

Telomere dysfunction induced by chemotherapeutic agents and radiation in normal human cells

The number of long-term survivors of patients with various malignancies (>5 years) is increasing mainly owing to advances in cancer therapeutics, but long-term side effects of the cancer treatment in this population have emerged as an important health and socio-economical issue. Telomeres and telomerase are known to be essential for regulation of cellular life-span and maintenance of genomic stability, and earlier studies have demonstrated that cancer patients who receive chemotherapy have shorter telomeres in their blood cells, indicating accelerated telomere erosion and a potential contribution of telomere loss to late side-effects. Little is currently known about the effect of chemotherapeutic agents and radiation on telomere dynamics including potential effects on telomere length, structure, function, telomerase activity, and telomere shelterin proteins in normal human cells. In the present study, we had addressed this issue experimentally. The treatment of normal human T lymphocytes and fibroblasts with chemotherapeutic agents doxorubicin (DOX) or etoposide (VP16) led to significant shortening of telomeres, down-regulation of telomerase activity, and diminished expression of telomerase reverse transcriptase (hTERT) and the telomere binding proteins TPP1 and POT1. More importantly, telomere dysfunction was observed in cells treated with DOX or VP16. Furthermore, all the above alterations were similarly found in the cells receiving γ-irradiation. Taken together, both chemotherapy and radiotherapy significantly impair telomere maintenance and function in normal human cells. Conceivably telomere dysfunction causes shortened life-span and genomic instability of normal human cells, and thereby contributes to tissue/organ damage and secondary malignancies in long-term survivors of cancer.

Physical and mental health status and health behaviors of childhood cancer survivors: findings from the 2009 BRFSS survey

BACKGROUND

The growing number of childhood cancer survivors makes examination of their current physical and mental health status and health behaviors an important concern. Much of what is known about the long-term outcomes of childhood cancer survivors comes from the Childhood Cancer Cohort Study (CCSS) which uses sibling controls.

PROCEDURE

Using data from the 2009 Behavioral Risk Factor Surveillance System survey, 651 childhood cancer survivors and 142,932 non-cancer peer controls were identified. The two groups were compared on a variety of physical and mental health status and health behavior variables using ANCOVA and binary logistic regression.

RESULTS

While controlling for differences in age, sex, and minority status, survivors significantly (P ≤ 0.001) had poorer socioeconomic outcomes, more comorbid conditions, lower life satisfaction, less social and emotional support, poorer general health, and reported more days per month of poor physical and mental health than non-cancer individuals. Survivors were more likely to report being a current smoker [odds ratio (OR) = 2.33; 95% confidence interval (CI), 1.98-2.73; P < 0.001]; tested for human immunodeficiency virus (HIV) (OR = 1.79; 95% CI, 1.52-2.11; P < 0.001); and that at least one HIV situation applied to them (OR = 2.06; 95% CI, 1.55-2.74; P < 0.001). No significant differences were found between groups in regards alcohol use and diet.

CONCLUSIONS

Results support and extend previous findings reported by the CCSS. New findings regarding survivors' increased likelihood to engage in risky behaviors proposes new directions for future research.

Primary care providers as partners in long-term follow-up of pediatric cancer survivors

PURPOSE

To develop a model of shared healthcare delivery that includes primary care providers (PCP) and ensures best practice in follow-up of pediatric cancer survivors.

METHOD

Structured interviews with healthcare professionals (HCPs) were used to ascertain familiarity and confidence in providing care to survivors. Partnerships were made with HCP societies, and survivor care lectures were given at HCP meetings. HCP's preferences for ongoing continuing education (CE) opportunities were ascertained. Cancer SurvivorLink(TM), a web-based tool, was developed to allow patients to securely store their healthcare documents and share them electronically with registered HCPs. Educational material developed for Cancer SurvivorLink(TM) includes CE modules and QuickFacts--concise summaries of late effects. Website utilization was monitored utilizing Google Analytics.

RESULTS

HCPs described moderate to very low familiarity with survivor care, but high interest in online CE learning. Thirty-one lectures were given to HCP groups to increase awareness. Preferred types of ongoing CE were: lectures, online text, and video modules. CE material was developed based on feedback from HCPs and website utilizations and includes 19 QuickFacts and 5 CE modules. During the first year, the website had 471 unique visitors and 1,129 total visits. QuickFacts received 345 views with Neurocognitive, Survivor Care 101, and Endocrine being most visited, and 49 CME modules have been completed.

CONCLUSIONS

PCPs are interested in partnering in models of shared care for pediatric cancer survivors. Effective educational initiatives include lectures within HCP's professional education constructs and web-based CE opportunities. PCP involvement in survivor care alleviates some barriers to care such as geographic distance to the the cancer center and ensures that more pediatric cancer survivors receive recommended coordinated surveillance for late effects of cancer therapy.

Dietary intake after treatment in child cancer survivors

BACKGROUND

Childhood cancer survivors (CCS) are at increased risk of complications such as obesity, diabetes, and osteoporosis which have the potential to, in part, be controlled with dietary interventions. To allow the development of appropriate dietary interventions for younger cancer survivors data on their dietary intake as well as information on parental nutrition views and practices need to be assessed.

PROCEDURE

Dietary intake of 50 CCS was assessed with a 3-day food diary (parent report). Parent child feeding practices were assessed with the Child Feeding Questionnaire (CFQ). Historical and anthropometric data was extracted from medical records. Survivors were less than 13 years old and less than 5 years after treatment completion.

RESULTS

Twenty percent of participating CCS was overweight or obese and 54% were consuming above their estimated energy requirements. Fifty, 32% and 44% of children did not meet requirements for folate, calcium, and iron respectively. There was a significant trend for increasing BMI percentiles from diagnosis to time of assessment (56.29 vs. 67.17, P = 0.01). Results from the CFQ showed that parents were more likely to monitor (3.99) and use a restrictive form of parenting (3.43) to control their child's food intake rather than pressure their child to eat (2.77) (P = 0.001).

CONCLUSION

This group displayed excessive energy intake (kilojoules) and poor dietary habits. Parents' restrictive feeding style may be contributing to these habits. Early interventions targeting the dietary intake of young survivors and associated parent feeding practices may prevent some of the deleterious long-term effects associated with childhood cancer therapy.

Daily physical activities and sports in adult survivors of childhood cancer and healthy controls: a population-based questionnaire survey

BACKGROUND

Healthy lifestyle including sufficient physical activity may mitigate or prevent adverse long-term effects of childhood cancer. We described daily physical activities and sports in childhood cancer survivors and controls, and assessed determinants of both activity patterns.

METHODOLOGY/PRINCIPAL FINDINGS

The Swiss Childhood Cancer Survivor Study is a questionnaire survey including all children diagnosed with cancer 1976-2003 at age 0-15 years, registered in the Swiss Childhood Cancer Registry, who survived ≥5 years and reached adulthood (≥20 years). Controls came from the population-based Swiss Health Survey. We compared the two populations and determined risk factors for both outcomes in separate multivariable logistic regression models. The sample included 1058 survivors and 5593 controls (response rates 78% and 66%). Sufficient daily physical activities were reported by 52% (n = 521) of survivors and 37% (n = 2069) of controls (p<0.001). In contrast, 62% (n = 640) of survivors and 65% (n = 3635) of controls reported engaging in sports (p = 0.067). Risk factors for insufficient daily activities in both populations were: older age (OR for ≥35 years: 1.5, 95CI 1.2-2.0), female gender (OR 1.6, 95CI 1.3-1.9), French/Italian Speaking (OR 1.4, 95CI 1.1-1.7), and higher education (OR for university education: 2.0, 95CI 1.5-2.6). Risk factors for no sports were: being a survivor (OR 1.3, 95CI 1.1-1.6), older age (OR for ≥35 years: 1.4, 95CI 1.1-1.8), migration background (OR 1.5, 95CI 1.3-1.8), French/Italian speaking (OR 1.4, 95CI 1.2-1.7), lower education (OR for compulsory schooling only: 1.6, 95CI 1.2-2.2), being married (OR 1.7, 95CI 1.5-2.0), having children (OR 1.3, 95CI 1.4-1.9), obesity (OR 2.4, 95CI 1.7-3.3), and smoking (OR 1.7, 95CI 1.5-2.1). Type of diagnosis was only associated with sports.

CONCLUSIONS/SIGNIFICANCE

Physical activity levels in survivors were lower than recommended, but comparable to controls and mainly determined by socio-demographic and cultural factors. Strategies to improve physical activity levels could be similar as for the general population.

Physician preferences and knowledge regarding the care of childhood cancer survivors in Japan: a mailed survey of the Japanese Society of Pediatric Oncology

OBJECTIVE

Japanese physicians' attitudes regarding the health-care needs of young adult childhood cancer survivors (CCSs) are not well described. Thus, we examined the self-reported preferences and knowledge of pediatric oncologists and surgeons.

METHODS

A mailed survey was sent to 858 physician members of the Japanese Society of Pediatric Oncology. We compared the responses of pediatric oncologists and pediatric surgeons.

RESULTS

The pediatric oncologists' response rate was 56% (300 out of 533) and that of pediatric surgeons 32% (105 out of 325). The median age of respondents was 46 and 48 years, respectively; 79 and 84% were men. When comfort levels in caring for CCSs were described (i.e. 1 = very uncomfortable; 7 = very comfortable), the mean levels were 4.4 and 3.8 with CCSs ≤ 21 years, 3.6 and 3.6 with 21 years < CCSs ≤ 30 years, and 2.8 and 3.3 with CCSs > 30 years, respectively. In clinical vignette questions, 62% of the pediatric oncologists and 43% of the surgeons answered three or more questions appropriately. Pediatric surgeons reported significantly lower familiarity with long-term follow-up guidelines than pediatric oncologists. Most pediatric oncologists and many surgeons conducted truth-telling of cancer diagnosis to adult CCSs now. They thought that the most important issues are an original long-term follow-up guideline suitable for the Japanese situation and collaborations with adult-based general physicians.

CONCLUSIONS

Many Japanese pediatric oncologists are uncomfortable with caring for survivors as they age and have suboptimal knowledge regarding late effects. The change in truth-telling situation and preference for collaboration with adult-based physicians was demonstrated also in Japan.

Cardiovascular risk and insulin resistance in childhood cancer survivors

OBJECTIVE

Increased cardiovascular (CV) risk has been reported in adults who are childhood cancer survivors (CCS). We sought to determine the emergence of CV risk factors in CCS while still children.

STUDY DESIGN

CCS in remission ≥5 years from cancer diagnosis (n=319, age=14.5 years) and their siblings (control subjects, n=208, age=13.6 years) participated in this cross-sectional study of CV risk, which included physiologic assessment of insulin sensitivity/resistance (hyperinsulinemic euglycemic clamp). Adjusted comparisons between CCS major diagnoses (leukemia [n=110], central nervous system tumors [n=82], solid tumors [n=127]) and control subjects were performed with linear regression for CV risk factors and insulin sensitivity.

RESULTS

Despite no significant differences in weight and body mass index, CCS had greater adiposity (waist [73.1 versus 71.1 cm, P=.02]; percent fat [28.1 versus 25.9%, P=.007]), lower lean body mass (38.4 versus 39.9 kg, P=.01) than control subjects. After adjustment for adiposity, CCS had higher total cholesterol level (154.7 versus 148.3 mg/dL, P=.004), low-density lipoprotein cholesterol level (89.4 versus 83.7 mg/dL, P=.002), and triglyceride level (91.8 versus 84 mg/dL, P=.03) and were less insulin sensitive (insulin stimulated glucose uptake, measure of insulin resistance, adjusted for lean body mass 12.1 versus 13.4 mg/kg/min, P=.002) than control subjects.

CONCLUSIONS

CCS have greater CV risk than healthy children. Because CV risk factors track from childhood to adulthood, early development of altered body composition and decreased insulin sensitivity in CCS may contribute significantly to their risk of early CV morbidity and mortality.

Internet use among childhood and young adult cancer survivors who smoke: implications for cessation interventions

OBJECTIVE

To identify patterns of Internet use among childhood and young adult cancer survivors who smoke.

METHODS

Baseline assessment data were collected from 2005 to 2008 for the Partnership for Health-2 (PFH-2) study, a web-based smoking cessation intervention for childhood and young adult cancer survivors. Participants were surveyed about their Internet access and use. Sociodemographic, clinical, and psychosocial data also were collected.

RESULTS

Internet access and use was widespread among PFH-2 participants. However, older, less-educated, and female survivors reported less frequent Internet use, even when they had access to the Internet at home and/or at work. These associations were significant in multivariable analyses.

CONCLUSIONS

Although the digital divide is narrowing, Internet use and engagement remains socially patterned. web-based prevention interventions are a promising method of reaching this geographically dispersed, high-risk population, but certain subgroups-particularly older and lower socioeconomic status survivors-might be missed by this approach.

Impact of survivorship-based research on defining clinical care guidelines

The growing number of individuals living five or more years from cancer diagnosis underscores the importance of providing guidance about potential late treatment effects to clinicians caring for long-term cancer survivors. Late treatment effects are commonly experienced by cancer survivors, increase in prevalence with aging, produce substantial morbidity, and predispose to early mortality. Findings from survivorship research permit providers to anticipate health risks among predisposed survivors and facilitate their access to interventions to prevent, detect, or rehabilitate cancer-related morbidity. This article reviews the impact that survivorship research has made in defining clinical care guidelines and the challenges that remain in developing and translating research findings into health screening recommendations that can optimize the quality and duration of survival after cancer.

Methods to assess adverse health-related outcomes in cancer survivors

Designing a study focused on adverse health-related outcomes among cancer survivors is complex. Similarly, reading and interpreting the findings of a survivorship-focused study requires an appreciation of the complexities of study design, potential biases, confounding factors, and other limitations. The topic areas are broad--study design, comparison populations, measures of risk, key health outcomes of interest, potential modifying factors to consider. With brevity, this article includes basic information to consider within these areas as well as examples and concepts intended to advance the science of survivorship research and encourage further reading and exploration.

Predictors of independent living status in adult survivors of childhood cancer: a report from the Childhood Cancer Survivor Study

BACKGROUND

Adult survivors of childhood cancer and their siblings are compared on one of the most salient developmental milestones of adulthood, the ability to live independently.

PROCEDURE

Adult survivors of childhood cancers (n = 6,047) and siblings (n = 2,326), all 25 years of age and older, completed a long-term follow-up questionnaire that assessed adaptive, neurocognitive, and psychological functioning, as well as demographic and health status. Multivariable logistic regression analyses and structural equation modeling (SEM) were used to identify predictors of independent living.

RESULTS

Compared to siblings (n = 206, 8.7%), survivors (n = 1063; 17.7%) were more than twice as likely to live dependently (OR 2.07; 95% confidence interval [CI] 1.77-2.42). Survivors diagnosed with CNS tumors (OR 0.13, 95% CI 0.10-0.18) or leukemia (OR 0.29, 95% CI 0.23-0.27) were significantly less likely to live independently compared to those diagnosed with Hodgkin lymphoma. Other risk factors for reduced independent living included cranial radiation (≤ 24 Gy OR 0.76, 95% CI 0.62-0.93; >24 Gy OR 0.31, 95% CI 0.24-0.41), use of neuroleptic, anticonvulsant, or psychostimulant medication (OR 0.32, 95% CI 0.24-0.43), attention and processing speed problems (OR 0.58, 95% CI 0.47-0.71), poor physical functioning (OR 0.49, 95% CI 0.38-0.63), depression (OR 0.68, 95% CI 0.53-0.88), and racial/ethnic minority status (OR 0.39, 95% CI 0.30-0.51). SEM demonstrated that neurocognitive functioning had both direct effects on independent living status, and indirect effects through use of neurologically directed medication, depression, and poor mental health.

CONCLUSION

Adult survivors of childhood cancer who experience neurocognitive, psychological, or physical late effects are less likely to live independently as adults.

Late effects in childhood cancer survivors: a review with a framing effect bias?

Most publications report the adverse (negative) health issues in childhood cancer survivors. Presenting information to the newly diagnosed patient in a positive manner is advocated, while noting that recurrence is the most likely adverse event. Re-analysis of population-based studies on life-threatening toxicities from Nordic, Dutch, United Kingdom, French, Italian, and N. American publications shows that 5-year survivors have a near normal life expectancy, 75% have no severe or life-threatening treatment related toxicity and 87% remain free of a second malignancy. Children who received radiation or anthracycline >250-300 mg/m(2) are at greatest risk for treatment related life-threatening toxicities.

Pain in long-term adult survivors of childhood cancers and their siblings: a report from the Childhood Cancer Survivor Study

Little is known about pain among long-term adult survivors of childhood cancers. The study investigated pain prevalence in this population compared with sibling controls and examined pain-related risk factors. Three self-reported pain outcomes including pain conditions, prescription analgesics used, and pain attributed to cancer and treatment were assessed among 10,397 cancer survivors and 3034 sibling controls from the Childhood Cancer Survivor Study. Pain conditions (pain/abnormal sensation, migraines, and other headaches) were reported by 12.3%, 15.5%, and 20.5% of survivors, respectively; 16.7% of survivors reported use of prescription analgesics, and 21% attributed pain to cancer and treatment. Risks of reporting pain conditions and using prescription analgesics were higher among survivors than siblings, adjusting for sociodemographic factors. Younger age at diagnosis and a history of non-Hodgkin lymphoma, Wilms tumor, or neuroblastoma (compared to leukemia) were associated with greater risk of reporting pain conditions. A history of bone cancer or soft tissue sarcoma (compared to leukemia) was associated with greater risks of using prescription analgesics and cancer-related pain attribution. Non-brain-directed scatter irradiation was associated with elevated risk for migraines and cancer-related pain attribution. Female gender and lower educational attainment were associated with increased reports of all 3 pain outcomes; minority status, unemployment, and being single were associated with greater risks for reporting pain conditions. These findings contribute to the understanding of pain and associated risk factors among adult survivors of childhood cancer and suggest areas of focus for pain intervention.

Cardiac function in survivors of acute lymphoblastic leukaemia and Hodgkin's lymphoma

AIM

The study objective was to assess plasma N-terminal-pro-brain natriuretic peptide (BNP) levels and to evaluate left ventricular mass as well as left ventricular systolic and diastolic functions in 44 children who had undergone treatment for acute lymphoblastic leukaemia and Hodgkin's lymphoma, with regard to gender, age at disease onset, time that had passed since therapy completion, cumulative dose of antracyclines and mediastinal radiotherapy applied.

METHODS

The median levels of pro-BNP were found to be higher in the whole study group as compared with the control (55.9 ± 53.1 ng/mL vs. 38.5 ± 47.7 ng/mL, P= 0.059). The pro-BNP values >80.0 ng/mL (standard deviation score (SDS)) were noted in 11/44 patients, including those exceeding 115.0 ng/mL (2 SDS) - in 6/44 patients.

RESULTS

No correlation was observed of pro-BNP levels with the accumulated dose of antracyclines (r=-0.42, P= 0.79) or mediastinal radiotherapy (r= 0.197, P= 0.2). However, negative correlation was found between pro-BNP and the time that had passed since therapy completion (r=-0.378, P= 0.009). In echocardiography, shortening and ejection fractions remained normal, whereas the indexed stroke volume was below 40 mL/m(2) in 16/44 patients. The E/A index below 1.5 was found in 6/44 cases. The left ventricular systolic mass remained within the normal range. Negative correlation was noted between isovolumetric diastolic time and pro-BNP level.

CONCLUSIONS

Increased levels of pro-BNP after anti-cancer treatment with the involvement of cardiotoxic substances may indicate the first symptoms of myocardial dysfunction, despite the lack of major echocardiographic disorders.

Outcomes and metrics: measuring the impact of a comprehensive adolescent and young adult cancer program

Against a background of poorly coordinated provision of holistic care to the adolescent and young adult (AYA) cancer population, the Canadian National Task Force on Adolescent and Young Adult Oncology, which is supported by the Canadian Partnership Against Cancer and the C17 network, convened a workshop to formulate the components of a systematic approach to care for this age group. Because such a program will deflect scarce resources, it must be validated and justified by reproducible metrics. A subgroup of experts was convened, comprising attendees at the AYA workshop, including AYA cancer survivors. A substantial number of key, feasible, and consistent metrics were identified and are systematized, justified, and presented in this article. Prioritization from within this range will be necessary.

Prospective medical assessment of adults surviving childhood cancer: study design, cohort characteristics, and feasibility of the St. Jude Lifetime Cohort study

BACKGROUND

To facilitate prospective medical assessment of adults surviving pediatric malignancies and advance knowledge about long-term childhood cancer survivor health, St. Jude Children's Research Hospital (SJCRH) is establishing a lifetime cohort of survivors.

METHODS

Eligibility criteria for inclusion in the St. Jude Lifetime Cohort (SJLIFE) study include: (1) diagnosis of childhood malignancy treated at SJCRH; (2) survival ≥ 10 years from diagnosis; and (3) current age ≥ 18 years. Three levels of participation are offered: (1) comprehensive evaluation on SJCRH campus; (2) limited home evaluation; or (3) completion of health surveys only. A systematic recruitment structure based upon blocks of 50 patients initially focused on leukemia and lymphoma survivors and patients eligible for pilot studies.

RESULTS

As of January 1, 2010, 1,625 (42%) of 3,900 eligible ≥ 10-year survivors have been contacted. Among the first 1,000 potentially eligible survivors selected for recruitment, 971 were subsequently confirmed to fulfill eligibility criteria. To date, 898/971 (92.5%) have been successfully contacted of whom 825 (91.8%) have agreed to participate. Among participants, 88.6% agreed to comprehensive medical evaluation, 0.4% limited local evaluation, and 11.0% survey only. Anticipated minimum overall participation rate for medical evaluation is 75.3% (731/971). Comparison of those contacted who agreed versus declined to participate revealed a greater proportion of males who declined participation (P = 0.001).

CONCLUSIONS

Early results of the SJLIFE study support its feasibility to recruit aging childhood cancer survivors to research investigations evaluating late health outcomes by medical assessments.

Fatigue, vitality, sleep, and neurocognitive functioning in adult survivors of childhood cancer: a report from the Childhood Cancer Survivor Study

BACKGROUND

Long-term survivors of childhood cancer are at risk for fatigue, sleep problems, and neurocognitive impairment, although the association between these outcomes has not been previously examined.

METHODS

Outcomes were evaluated in 1426 survivors from the Childhood Cancer Survivor Study using a validated Neurocognitive Questionnaire. Relative risks for neurocognitive impairment were calculated using demographic and treatment factors, and survivors' report on the Functional Assessment of Chronic Illness Therapy-Fatigue, the Short Form-36 Vitality Scale, the Pittsburgh Sleep Quality Index, and the Epworth Sleepiness Scale.

RESULTS

Neurocognitive impairment was identified in >20% of survivors, using sibling-based norms for comparison. Multivariate logistic regression models revealed that fatigue (risk ratio [RR], 1.34; 95% confidence interval [CI], 1.13-1.59), daytime sleepiness (RR, 1.68; 95% CI, 1.55-1.83), poor sleep quality (RR, 1.23; 95% CI, 1.01-1.49), and decreased vitality (RR, 1.75; 95% CI 1.33-2.30) were all associated with impaired task efficiency. Likewise, fatigue (RR, 1.77; 95% CI, 1.23-2.55), sleepiness (RR, 1.38; 95% CI, 1.14-1.67), and decreased vitality (RR, 3.08; 95% CI, 1.98-4.79) were predictive of emotional regulation problems. Diminished organization was associated with increased sleepiness (RR, 1.80; 95% CI, 1.31-2.48) and decreased vitality (RR, 1.90; 95% CI, 1.37-2.63). Impaired memory was associated with poor sleep quality (RR, 1.45; 95% CI, 1.19-1.76), increased sleepiness (RR, 2.05; 95% CI, 1.63-2.58), and decreased vitality (RR, 2.01; 95% CI, 1.42-2.86). The impact of fatigue, sleepiness, sleep quality, and vitality on neurocognitive outcomes was independent of the effects of cranial radiation therapy, steroids and antimetabolite chemotherapy, sex, and current age.

CONCLUSIONS

Neurocognitive function in long-term survivors of childhood cancer appears particularly vulnerable to the effects of fatigue and sleep disruption. These findings suggest sleep hygiene should be emphasized among survivors, as it may provide an additional mechanism for intervention to improve neurocognitive outcomes.