Neurocognitive consequences of a paediatric brain tumour and its treatment: a meta-analysis

Monitoring and Assessment of Neuropsychological Outcomes as a Standard of Care in Pediatric Oncology

Central nervous system cancers or exposure to CNS-directed therapies increase risk for neuropsychological deficits. There are no accepted guidelines for assessment of neuropsychological functioning in this population. A multifaceted literature search was conducted and relevant literature reviewed to inform the guidelines. Studies of neuropsychological outcomes are widely documented in the pediatric oncology literature. There is strong evidence of need for neuropsychological assessment, but insufficient evidence to guide the timing of assessment, nor to recommend specific interventions. Children with brain tumors and others at high risk for neuropsychological deficits should be monitored and assessed for neuropsychological deficits.

Impact of Cancer and Its Treatments on Cognitive Function: Advances in Research From the Paris International Cognition and Cancer Task Force Symposium and Update Since 2012

CONTEXT

Although cognitive impairments have been identified in patients with non-central nervous system cancer, especially breast cancer, the respective roles of cancer and therapies, and the mechanisms involved in cognitive dysfunction remain unclear.

OBJECTIVES

To report a state-of-the-art update from the International Cognitive and Cancer Task Force conference held in 2012.

METHODS

A report of the meeting and recent new perspectives are presented.

RESULTS

Recent clinical data support that non-central nervous system cancer per se may be involved in cognitive dysfunctions associated with inflammation parameters. The role of chemotherapy on cognitive decline was confirmed in colorectal and testicular cancers. Whereas the impact of hormone therapy remains debatable, some studies support a negative impact of targeted therapies on cognition. Regarding interventions, preliminary results of cognitive rehabilitation showed encouraging results. The methodology of future longitudinal studies has to be optimized by a priori end points, the use of validated test batteries, and the inclusion of control groups. Comorbidities and aging are important factors to be taken into account in future studies. Preclinical studies in animal models highlighted the role of cancer itself on cognition and support the possible benefits of prevention/care during chemotherapy. Progress in neuroimaging will help specify neural processes affected by treatments.

CONCLUSION

Clinical data and animal models confirmed that chemotherapy induces direct cognitive deficit. The benefits of cognitive rehabilitation are still to be confirmed. Studies evaluating the mechanisms underlying cognitive impairments using advanced neuroimaging techniques integrating the evaluation of genetic factors are ongoing.

Functional Outcomes and Unplanned Transfers of Pediatric Patients With Central Neurological Impairments Receiving Inpatient Rehabilitation Care With Cancer and Noncancer Diagnoses

BACKGROUND

Functional impairments from central nervous system (CNS) dysfunction experienced by pediatric patients with cancer diagnoses are well documented. However, little is known of these patients' functional outcomes and potential complications while receiving inpatient rehabilitation services.

OBJECTIVE

To compare functional outcomes and unplanned transfer rates of pediatric patients with impairments associated with CNS dysfunction between those with primary cancer diagnoses and noncancer diagnoses while receiving inpatient rehabilitation care.

DESIGN

Retrospective comparison cohort study.

SETTING

Inpatient rehabilitation unit within a regional tertiary care pediatric hospital.

PARTICIPANTS

Patients with CNS-based functional impairments with primary cancer diagnoses (n = 107) and noncancer diagnoses (n = 480), admitted to the inpatient rehabilitation unit between January 1, 2005 and April 1, 2012, who were aged 1 to 20 years at time of admission.

INTERVENTION

Not applicable.

MAIN OUTCOME MEASURES

Pediatric Functional Independence Measure (WeeFIM) reflecting functional status was collected at admission and discharge with change score and WeeFIM efficiency calculated. Length of stay on the rehabilitation unit and unplanned transfer rates were also collected.

RESULTS

No significant difference in total WeeFIM scores at admission was found between cancer and noncancer groups. Both groups had significant increases in WeeFIM scores at discharge (P < .001). The noncancer group had significantly higher WeeFIM change in self-care (P = .001), mobility (P = .009), and total score (P = .004) and had a greater length of stay (P < .001). A comparison of WeeFIM efficiency in all domains revealed no significant difference between cancer and noncancer groups. There was also no significant between-group difference in unplanned transfer rates.

CONCLUSIONS

Children with CNS-based functional impairments with cancer and noncancer diagnoses made functional gains with similar WeeFIM efficiencies after undergoing inpatient rehabilitation. However, patients with noncancer diagnoses made greater gains in self care, mobility, and total scores with longer stays on the rehabilitation service. No significant difference was found in unplanned transfer rates between cancer and noncancer groups for acute medical care.

Cognitive dysfunction in children with brain tumors at diagnosis

BACKGROUND

Survivors of brain tumors have a high risk for a wide range of cognitive problems. These dysfunctions are caused by the lesion itself and its surgical removal, as well as subsequent treatments (chemo- and/or radiation therapy). Multiple recent studies have indicated that children with brain tumors (BT) might already exhibit cognitive problems at diagnosis, i.e., before the start of any medical treatment. The aim of the present study was to investigate the baseline neuropsychological profile in children with BT compared to children with an oncological diagnosis not involving the central nervous system (CNS).

METHODS

Twenty children with BT and 27 children with an oncological disease without involvement of the CNS (age range: 6.1-16.9 years) were evaluated with an extensive battery of neuropsychological tests tailored to the patient's age. Furthermore, the child and his/her parent(s) completed self-report questionnaires about emotional functioning and quality of life. In both groups, tests were administered before any therapeutic intervention such as surgery, chemotherapy, or irradiation. Groups were comparable with regard to age, gender, and socioeconomic status.

RESULTS

Compared to the control group, patients with BTs performed significantly worse in tests of working memory, verbal memory, and attention (effect sizes between 0.28 and 0.47). In contrast, the areas of perceptual reasoning, processing speed, and verbal comprehension were preserved at the time of measurement.

CONCLUSION

Our results highlight the need for cognitive interventions early in the treatment process in order to minimize or prevent academic difficulties as patients return to school.

Early Cognitive Outcomes Following Proton Radiation in Pediatric Patients With Brain and Central Nervous System Tumors

PURPOSE

To report, from a longitudinal study, cognitive outcome in pediatric patients treated with proton radiation therapy (PRT) for central nervous system (CNS) tumors.

METHODS AND MATERIALS

Sixty patients receiving PRT for medulloblastoma (38.3%), gliomas (18.3%), craniopharyngioma (15.0%), ependymoma (11.7%), and other CNS tumors (16.7%) were administered age-appropriate measures of cognitive abilities at or near PRT initiation (baseline) and afterward (follow-up). Patients were aged ≥ 6 years at baseline to ensure consistency in neurocognitive measures.

RESULTS

Mean age was 12.3 years at baseline; mean follow-up interval was 2.5 years. Treatment included prior surgical resection (76.7%) and chemotherapy (61.7%). Proton radiation therapy included craniospinal irradiation (46.7%) and partial brain radiation (53.3%). At baseline, mean Wechsler Full Scale IQ was 104.6; means of all 4 Index scores were also in the average range. At follow-up, no significant change was observed in mean Wechsler Full Scale IQ, Verbal Comprehension, Perceptual Reasoning/Organization, or Working Memory. However, Processing Speed scores declined significantly (mean 5.2 points), with a significantly greater decline for subjects aged <12 years at baseline and those with the highest baseline scores. Cognitive outcome was not significantly related to gender, extent of radiation, radiation dose, tumor location, histology, socioeconomic status, chemotherapy, or history of surgical resection.

CONCLUSIONS

Early cognitive outcomes after PRT for pediatric CNS tumors are encouraging, compared with published outcomes from photon radiation therapy.

Cognitive training programs for childhood cancer patients and survivors: A critical review and future directions

A robust literature has developed documenting neurocognitive late effects in survivors of leukemia and central nervous system (CNS) tumors, the most frequent cancer diagnoses of childhood. Patterns of late effects include deficits in attention and concentration, working memory, processing speed, and executive function, as well as other domains. As childhood cancer survivors are living longer, ameliorating deficits both in broad and specific neurocognitive domains has been increasingly recognized as an endeavor of paramount importance. Interventions to improve cognitive functioning were first applied to the field of pediatric oncology in the 1990s, based on strategies used effectively with adults who had sustained a traumatic brain injury (TBI). Compilation and modification of these techniques has led to the development of structured cognitive training programs, with the effectiveness and feasibility of such interventions currently an active area of research. Consequently, the purpose of this critical review is to: (1) review cognitive training programs intended to remediate or prevent neurocognitive deficits in pediatric cancer patients and survivors, (2) critically analyze training program strengths and weaknesses to inform practice, and (3) provide recommendations for future directions of clinical care and research.

Psychiatric disorders in 130 survivors of childhood cancer: preliminary results of a semi-standardized interview

BACKGROUND

Although psychological sequelae are well known among survivors of childhood cancer, psychiatric sequelae remain inadequately explored. Long-term psychiatric sequelae and their main risk factors in this population were evaluated.

PROCEDURE

Initially, 483 survivors of childhood cancer, except leukemia, were invited to complete a questionnaire assessing their health and quality of life. Of them, 130 completed the survey, subsequently consulted with a pediatric oncologist and an internist, and met with a psychologist for a semi-standardized interview based on the Mini International Neuropsychiatric Interview (MINI), which allowed diagnosis of DSM-IV Axis 1 psychiatric disorders. The collected data were compared with those of the French general population.

RESULTS

Seventy-three of the 130 survivors (56.2%) who completed the MINI interview reported experiencing at least one psychiatric disorder since cancer diagnosis, mostly anxiety (39.2%), mood (27.7%), or major depressive (24.6%) disorders; 46 reported at least one current disorder (35.4%). Agoraphobia (P = 0.02) and psychotic disorders were more common (P = 0.003) and general anxiety disorder less common (P < 0.001) among survivors than the general population. Most disorders correlated significantly with survivors' ratings of lower quality of life. Smoking, cancer type, and treatments significantly influenced the prevalence of psychiatric disorders.

CONCLUSIONS

Results were consistent between the self-questionnaire and MINI interview responses, though time may have biased memory. Vulnerability to and high risk for developing DSM-IV Axis 1 psychiatric disorders of childhood cancer survivors can persist long after diagnosis and treatment. Thus, systematic and general psychological screening of survivors may facilitate long-term psychological restoration.

Social competence in pediatric brain tumor survivors: application of a model from social neuroscience and developmental psychology

Pediatric brain tumor (BT) survivors are at risk for psychosocial late effects across many domains of functioning, including neurocognitive and social. The literature on the social competence of pediatric BT survivors is still developing and future research is needed that integrates developmental and cognitive neuroscience research methodologies to identify predictors of survivor social adjustment and interventions to ameliorate problems. This review discusses the current literature on survivor social functioning through a model of social competence in childhood brain disorder and suggests future directions based on this model. Interventions pursuing change in survivor social adjustment should consider targeting social ecological factors.

Differences in parent and teacher rating of everyday executive function in pediatric brain tumor survivors

We aimed to compare executive function (EF) outcomes in pediatric brain tumor (BT) survivors compared with healthy children (HC) across multiple settings. This retrospective cross-sectional study of BT survivors and age- and gender-matched HC analyzed scale patterns of parent and teacher ratings of EF (Behavior Ratings of Executive Function; BRIEF). We also analyzed relationships between groups and raters (parent/teacher) and clinical elevations across EF domains on the BRIEF. Group differences in aspects of EF emerged from parent ratings in working memory (WM), while significant interactions from teacher ratings emerged on nearly all EF scales. Parents reported impaired cognitive/behavioral flexibility in the BT group four times more than parents of HC. Teachers rated survivors significantly more poorly as a group on the majority of EF domains, and indicated clinical impairment in cognitive/behavioral flexibility, emotional regulation, self-starting/initiation, WM, and planning and organization (P/O) four to ten times more often than the teachers of HC. Overall, teacher ratings of EF impairment in pediatric BT survivors were significantly greater than parent ratings, who reported far fewer EF problems. Possible explanations for inter-rater discrepancies include potential reporting bias/response shift in parents and/or differences in EF demands across settings.

Working memory abilities among children treated for medulloblastoma: parent report and child performance

OBJECTIVE

We investigated the 5-year postsurgical developmental trajectory of working memory (WM) in children with medulloblastoma using parent and performance-based measures.

METHOD

This study included 167 patients treated for medulloblastoma. Serial assessments of WM occurred at predetermined time points for 5 years.

RESULTS

There was a subtle, statistically significant increase in parental concern about WM, coupled with a statistically significant decrease in age-standardized scores on performance-based measures. However, whole-group mean scores on both parent and performance-based measures remained in the age-expected range. Posterior fossa syndrome was consistently associated with poorer WM. Younger age at treatment and higher treatment intensity were associated with greater negative change in WM performance only.

CONCLUSIONS

Most children treated for medulloblastoma display WM within the age-appropriate range according to parent report and performance. However, the subtle negative changes over time and identified subgroups at increased risk highlight the need for ongoing monitoring of this population.

Access to neuropsychologic services after pediatric brain tumor

BACKGROUND

Increasing survival rates for children with brain tumors creates a greater need for neuropsychologic follow-up and intervention. The aim of this study was to evaluate rates of referral by medical doctors to neuropsychologic services and patient and treatment factors that differentiated referred and nonreferred patients.

METHODS

Data were retrieved from medical records of all pediatric brain tumor patients in southern Sweden diagnosed between 1993 and 2004 who survived more than 1 year (n = 132). Characteristics of the patients, the cancer, and treatment received were then compared for patients who were and were not referred for neuropsychologic examination during that period.

RESULTS

Sixty-four (48%) of the pediatric brain tumor patients were referred for neuropsychologic evaluation. These patients had significantly larger tumors, more recurrences of cancer, and increased intracranial pressure at diagnosis when compared with the nonreferred group (n = 68). However, most of the patients in the nonreferred group either had significant risk factors for cognitive impairment or were reporting impairments that would suggest a referral was warranted.

CONCLUSIONS

Given the high rates of cognitive impairment in children with brain tumors, referral to neuropsychologic services should be considered in all survivors. In addition to improving long-term adjustment, systematic referral can provide data on cognitive impairments, making it possible to evaluate different cancer treatment protocols not only in terms of survival but also in terms of quality of survival. Greater efforts are needed to disseminate and raise awareness about published guidelines on the long-term care of pediatric brain tumor patients.