Emotional distress in parents of long-term survivors of childhood acute lymphoblastic leukemia.

OBJECTIVE: The current study investigated the occurrence of emotional distress in parents of long-term survivors of childhood acute lymphoblastic leukemia (ALL) and identified factors associated with parent emotional distress symptoms. METHODS: Parents of 127 long-term survivors of childhood ALL treated on a chemotherapy-only protocol at St. Jude Children's Research Hospital participated in the study. Parents completed standard ratings of emotional distress, caregiver strain, and child physical, emotional, and psychosocial functioning. Multivariable hierarchical linear regression analyses were used to examine associations between symptoms of caregiver strain, survivor functioning, and parent emotional distress. Covariates included parent education, survivor age, survivor sex, and time since childhood cancer diagnosis. RESULTS: On average, few parents reported significant symptoms of emotional distress. Clinically significant levels of anxiety and depression were reported by 7.1% and 3.1% of parents, respectively. Only 3.9% of parents endorsed significant symptoms of posttraumatic stress. Perceived caregiver strain was significantly associated with symptoms of parent anxiety, depression, and posttraumatic stress. Parent-report of child emotional functioning was significantly associated with symptoms of parent anxiety. CONCLUSIONS: Most parents of long-term survivors of ALL exhibit low levels of emotional distress in the context of rates observed in the general population. Perceived caregiver strain was significantly associated with parent emotional distress. Further research is required to examine specific sources of caregiver strain, as well as other risk and protective factors associated with parent emotional distress symptoms.

Utility of the N-back task in survivors of childhood acute lymphoblastic leukemia.

The N-back task is often used in functional brain imaging studies to activate working memory networks; however, limited information is available on its association to clinical outcomes in children or cancer survivors. A total of 137 survivors of acute lymphoblastic leukemia (ALL; mean current age = 14.3 years, SD = 4.8; time since diagnosis = 7.6 years, SD = 1.6) completed the N-back task and comprehensive neurocognitive testing, including standardized measures of attention, processing speed, and working memory. Results indicated that females demonstrated significantly slower reaction times (0-back p = .02; 1-back p = .03) than males. Survivors <15 years old at the time of testing demonstrated a significant decrease in accuracy as working memory load increased compared to survivors ≥15 years old (p < .001). Performance on the N-back task was associated with nonverbal working memory (rs = .56, p < .001) in survivors ≥15 years of age. For younger survivors, N-back performance was more strongly associated with attention skills. Results suggest the N-back assesses different cognitive constructs at younger compared to older childhood ages. These age differences should be considered in interpreting functional brain imaging results.

Cerebral white matter integrity and executive function in adult survivors of childhood medulloblastoma.

Survivors of pediatric medulloblastoma are at risk for neurocognitive dysfunction. Reduced white matter integrity has been correlated with lower intelligence in child survivors, yet associations between specific cognitive processes and white matter have not been examined in long-term adult survivors. Twenty adult survivors of medulloblastoma were randomly recruited from a larger institutional cohort of adult survivors of childhood cancer. Survivors underwent comprehensive neurocognitive evaluations and MRI. Data on brain volume and cortical thickness and diffusion tensor imaging were acquired, including measures of fractional anisotropy, apparent diffusion coefficient, and axial and radial diffusivity. Observed neurocognitive scores were compared with population norms and correlated to MRI indices. Survivors were, on average, 29 years of age and 18 years postdiagnosis. Mean full-scale intelligence quotient was nearly 1 SD below the normative mean (86.3 vs 100, P = .004). Seventy-five percent of survivors were impaired on at least one measure of executive function. Radial diffusivity in the frontal lobe of both hemispheres was correlated with shifting attention (left: r(s) = -0.67, P = .001; right: r(s) = -0.64, P = .002) and cognitive flexibility (left: r(s) = -0.56, P = .01; right: r(s) = -0.54, P = .01). Volume and cortical thickness were not correlated with neurocognitive function. Neurocognitive impairment was common and involved many domains. Reduced white matter integrity in multiple brain regions correlated with poorer performance on tasks of executive function. Future research integrating diffusion tensor imaging should be a priority to more rigorously evaluate long-term consequences of cancer treatment and to inform cognitive intervention trials in this high-risk population.