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Background: No web-based interventions addressing sexual problems are available for young adult survivors of childhood cancer. Aim: This study aimed to test the efficacy of a web-based psychoeducational intervention, Fex-Can Sex, to alleviate sexual problems in young adults treated for cancer during childhood. Method: This randomized controlled trial tested the effects of a 12-week, self-help, web-based intervention. Young adults (aged 19–40) reporting sexual dysfunction were drawn from a population-based national cohort of childhood cancer survivors and randomized to either an intervention group (IG, n = 142) or a wait-list control group (CG, n = 136). The primary outcome was ‘Satisfaction with sex life’ assessed by the PROMIS® SexFS v 2.0. Secondary outcomes included other SexFS domains, body image (BIS), emotional distress (HADS), health-related quality of life (EORTC QLQ-C30), and sex-related self-efficacy. Surveys were completed at baseline (T0), directly after the intervention (T1), and three months later (T2). The effects of the intervention were tested using t-test and linear mixed models, including intention-to-treat (ITT) and subgroups analysis. Adherence was based on log data extracted from the website system. The intervention included an open-ended question about perceived sexual problems. Results: No effect of the intervention was found in the primary outcome. Regarding secondary outcomes, the IG reported less vaginal dryness (Lubrication subscale) than the CG at T1 (p = 0.048) and T2 (p = 0.023). Furthermore, at T1, the IG reported less emotional distress than the CG (p = 0.047). Subgroup analyses showed that those with greater sexual problems at T0 improved over time (T1 and T2), regardless of group allocation. Overall, adherence to the intervention was low and participants' activity levels did not change the results. Additionally, some members of the IG reported increased understanding and acceptance of their sexual problems. Conclusion: The Fex-Can Sex intervention shows potential to improve sexual function, especially among those with greater dysfunction. To increase adherence and effect, we recommend the intervention to be further developed including more tailored content. Clinical trial registration: ISRCTN Registry, trial number: 33081791 (registered on November 27, 2019).

Aim: The aim of the study was to investigate how young adult survivors of childhood cancer used an online discussion forum as part of a web-based psycho-educational intervention. Specifically, we aimed to characterize users of the discussion forum, investigate how they used the discussion forum (type of usage) and content of the posted messages. Methods: This study is a part of a randomized controlled trial, Fex-Can Childhood RCT. Participants with self-reported sexual dysfunction or fertility-related distress were drawn from a population-based national cohort. Sociodemographic and clinical characteristics of the intervention group (n = 322) and data on usage of the discussion forum were analysed with descriptive statistics and compared between subgroups. Messages posted in the online discussion forum were analysed with qualitative thematic analysis. Results: Approximately half (48 %) of participants in the intervention group accessed the discussion forum and most of them (76 %) without writing own posts. Users of the discussion forum did not statistically differ in sociodemographic or clinical characteristics from the rest of the intervention group. The 97 written posts, written by 38 individuals, were mainly descriptions of own experiences and thoughts and concerned three themes: A changed body, Concerns around family building and Longing for support. Peer-support and interaction between participants were seen in some forum threads and the ‘like’-function was frequently used, demonstrating engagement and activity. Participants expressed that they felt affinity with and appreciated sharing own experiences and to recognize themselves in others' stories. Conclusions: A discussion forum as part of a web-based intervention appears to be a valuable component by giving participants an opportunity to share intimate experiences and concerns related to surviving cancer. Trial registration: ISRCTN Registry, trial number: 33081791 (registered on November 27, 2019).