Background: Parents of children treated for cancer may experience mental health difficulties, such as depression and anxiety. There is a lack of evidencebased psychological interventions for parents, with psychological support needs unmet. An internet-administered, guided, low-intensity cognitive behavioral therapy-based (LICBT) self-help intervention may provide a solution. Methods:The feasibility and acceptability of such an intervention was examined using a single-arm feasibility trial (ENGAGE). Primary objectives examined:(1) estimates of recruitment and retention rates; (2) feasibility and acceptability of data collection instruments and procedures; and (3) intervention feasibility and acceptability. Clinical outcomes were collected at baseline, post-treatment (12 weeks), and follow-up (6 months). Results:The following progression criteria were met: sample size was exceeded within 5 months, with 11.0% enrolled of total population invited, study dropout rate was 24.0%, intervention dropout was 23.6%, missing data remained at ≤10% per measure, and no substantial negative consequences related to participation were reported. Intervention adherence was slightly lower than progression criteria (47.9%). Conclusion:Findings suggest an internet-administered, guided, LICBT self-help intervention may represent a feasible and acceptable solution for parents of children treated for cancer. With minor study protocol and intervention modifications, progression to a pilot randomized controlled trial (RCT) and subsequent superiority RCT is warranted.

Objective: Childhood cancer treatment completion is associated with mental health difficulties and negative socioeconomic consequences for parents. However, psychological support needs are often unmet. We developed an internet-administered, guided, low-intensity cognitive behavioral therapy-based self-help intervention (EJDeR) and examined feasibility and acceptability with a single-arm feasibility trial (ENGAGE). Results suggest EJDeR is acceptable, however, adherence, especially for fathers, could be improved. Following the Medical Research Council complex interventions framework, this study explores concerns experienced by parents actively seeking support related to their child's cancer who were recruited into ENGAGE to inform further adaptation of EJDeR.Method: Seventy-three semi-structured interviews (26 fathers, 47 mothers) were conducted, with data analyzed using manifest content analysis. Results: Analysis resulted in seven categories: (1) Feeling lost and lonely in life; (2) Low mood; (3) Parenting difficulties; (4) Productivity difficulties; (5) Relationship challenges; (6) Stress reactions; and (7) Worry. With the exception of subcategories Afraid of not being a good parent, Cancer recurrence, and Child's development and future a somewhat higher percentage of mothers than fathers mentioned all identified concerns. Conclusion:Parents described experiencing a range of concerns after their child had completed cancer treatment. EJDeR will be adapted to address these concerns and include indirect intervention modules targeting concerns such as stress. Information to support parenting, relationships, finance, and employment difficulties, alongside signposting to inform help-seeking, will be included. Findings also suggest a need to improve the gender-sensitivity of EJDeR.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.