Barriers to care in pediatric cancer: The role of illness uncertainty in relation to parent psychological distress.

OBJECTIVE: The current study evaluated perceived barriers to care for parents of children with cancer and the mediating effect of illness uncertainty (IU; uncertainty from the ambiguity or unpredictability of the illness) on the relationship between barriers and parental psychological distress. We hypothesized that greater barriers to care would be related to higher levels of IU and, in turn, higher anxiety, depression, and posttraumatic stress symptom (PTSS) ratings. METHODS: As part of an ongoing study of family adjustment to pediatric cancer, 145 caregivers of children diagnosed with cancer completed questionnaires assessing barriers to care, parent IU, and anxious symptoms, depressive symptoms, and PTSS. Time since cancer diagnosis ranged from 1 to 12 months. RESULTS: Three mediation models assessed IU as a mediator between barriers to care and anxious symptoms, depressive symptoms, and PTSS, controlling for annual income. IU significantly mediated the relationship between barriers to care and depressive symptoms (B = -.03, SE = .02; 95% CI [-.08, -.01]) and to PTSS (B = -.15, SE = .10; 95% CI [-.38, -.03]). The mediation model was not significant for anxious symptoms. CONCLUSION: Experiencing barriers to obtaining treatment for their child with cancer is a significant risk factor for symptoms of depression and PTSS among parents. Specifically, greater barriers to care is significantly associated with IU, a well-established precursor to distress in this population. Interventions targeting IU may help ameliorate distress within the context of unmodifiable barriers to care.

Post traumatic stress symptoms in parents of children with cancer: A mediation model.

OBJECTIVE: Caregivers of pediatric cancer patients are at risk for posttraumatic stress symptoms (PTSS). Previous literature has identified caregiver illness uncertainty as a predictor of PTSS, yet little is known about the mechanism by which illness uncertainty may affect PTSS. Rumination, or perseverations about the cause and consequences of an event, has been related to posttraumtic stress disorder in other populations. However, limited research of this relationship exists for pediatric cancer caregivers. Further, no studies have evaluated rumination in relation to illness uncertainty. The current study examined rumination in relation to illness uncertainty and PTSS in caregivers with children actively receiving treatment for cancer. It was hypothesized that rumination would be related to illness uncertainty and would mediate the relationship between illness uncertainty and PTSS. METHODS: Caregivers (N = 59) completed the Parent Perception of Uncertainty Scale, Ruminative Responses Scale, and the Impact of Event Scale-Revised. RESULTS: illness uncertainty was identified as a significant predictor of rumination (B = 0.148, p = .015), and rumination was a significant predictor of PTSS (B = 1.83, p < .001). Biased-corrected bootstrap regression analysis revealed that rumination mediated the relationship between illness uncertainty and PTSS (R2 = 0.53, p < .001). CONCLUSIONS: Rumination was identified as a mediator between the relationship of illness uncertainty and PTSS. These findings underscore the importance of rumination in caregivers of children with cancer, as a potential construct for identifying caregivers at risk of PTSS, and as a possible mechanism for targeted intervention.

Adenocarcinoma of the cervix and vagina in pediatric patients.

Here we report our combined analysis of vaginal mesonephric adenocarcinoma (MA) in a 13 years old treated at our institution and of reported vaginal or cervical MA and clear-cell adenocarcinoma in 37 patients 18 years old or younger. Tumors in 27 patients arose in the vagina; 8 (21%) had metastases at diagnosis. The predominant symptom was vaginal bleeding; 62% of patients were exposed to diethylstilbestrol in utero. The 3-year survival estimate was 71% +/- 11%. Surgical treatment and metastasis at diagnosis were significant predictors of survival. The association between tumor excision and excellent outcome suggests that radical hysterectomy or pelvic exenteration is unnecessary. Radiotherapy as an adjunct may have contributed to this outcome.

Isolated allogeneic bone marrow-derived mesenchymal cells engraft and stimulate growth in children with osteogenesis imperfecta: Implications for cell therapy of bone.

Treatment with isolated allogeneic mesenchymal cells has the potential to enhance the therapeutic effects of conventional bone marrow transplantation in patients with genetic disorders affecting mesenchymal tissues, including bone, cartilage, and muscle. To demonstrate the feasibility of mesenchymal cell therapy and to gain insight into the transplant biology of these cells, we used gene-marked, donor marrow-derived mesenchymal cells to treat six children who had undergone standard bone marrow transplantation for severe osteogenesis imperfecta. Each child received two infusions of the allogeneic cells. Five of six patients showed engraftment in one or more sites, including bone, skin, and marrow stroma, and had an acceleration of growth velocity during the first 6 mo postinfusion. This improvement ranged from 60% to 94% (median, 70%) of the predicted median values for age- and sex-matched unaffected children, compared with 0% to 40% (median, 20%) over the 6 mo immediately preceding the infusions. There was no clinically significant toxicity except for an urticarial rash in one patient just after the second infusion. Failure to detect engraftment of cells expressing the neomycin phosphotransferase marker gene suggested the potential for immune attack against therapeutic cells expressing a foreign protein. Thus, allogeneic mesenchymal cells offer feasible posttransplantation therapy for osteogenesis imperfecta and likely other disorders originating in mesenchymal precursors.