Petter Gjersvik

• Brandtzæg, Karianne Haga; Lippe, Charlotte von der; Almdahl, Ina S.; Rossow, Anvor Søvde; Falk, Ragnhild S. & Gjersvik, Petter [Show all 8 contributors for this article] (2026). Quality of Life, Mental Health and Executive Function in Individuals with Basal Cell Naevus Syndrome. Acta Dermato-Venereologica. ISSN 0001-5555. 106. doi: 10.2340/actadv.v106.adv-2026-0335. Full text in Research Archive Show summary

  Basal cell naevus syndrome (BCNS) is a rare genetic disorder characteriszed by multiple basal cell carcinomas, as well as different extracutaneous tumours, cysts and abnormalities. Research on health-related quality of life (HRQoL) and mental health in BCNS is limited. This cross-sectional study included 62 individuals ≥18 years diagnosed with BCNS. Clinical and genetic data were collected, and five5 validated questionnaires were used to assess self-reported HRQoL, psychological distress, fatigue, pain and everyday executive functioning. Median regression analyses were conducted to identify factors associated with HRQoL. Independent samples t-tests and one proportion z-tests were conducted to compare the BCNS group with the general population. Individuals with BCNS reported lower HRQoL compared with the general population. Elevated anxiety symptoms were observed in 14 individuals (24%). The proportion of individuals reporting everyday executive deficits was higher in the BCNS group compared with the general population. Engagement in employment or higher education was associated with better physical and mental HRQoL, whereas symptoms of anxiety and everyday executive deficits were associated with reduced mental HRQoL. Findings highlight mental health challenges in BCNS. Routine screening for anxiety and executive functioning is suggested as essential steps in identifying those at risk and provideproviding timely psychological support.

• Gjersvik, Petter & Olsen, Anne Olaug (2025). Sexual infection. Tidsskrift for Den norske legeforening (Tidsskriftet). ISSN 0029-2001. 145(7). doi: 10.4045/tidsskr.25.0144. Full text in Research Archive
• Skullerud, Kristin Helene; Gjersvik, Petter; Pripp, Are Hugo; Qvigstad, Erik; Vangen, Siri & Helgesen, Anne Lise Ording (2025). Apremilast Versus Placebo for Genital Erosive Lichen Planus in Women: A Randomized Controlled Trial. Journal of Lower Genital Tract Disease. ISSN 1089-2591. 30(1), p. 60–65. doi: 10.1097/LGT.0000000000000915. Full text in Research Archive
• Gjersvik, Petter & Bretthauer, Michael (2025). Avlæring og ferdighetsreduksjon ved bruk av kunstig intelligens. Tidsskrift for Den norske legeforening (Tidsskriftet). ISSN 0029-2001. 145(13). doi: 10.4045/tidsskr.25.0565. Full text in Research Archive
• Brandtzæg, Karianne Haga; Lippe, Charlotte von der; Vestengen, Ingvild Kibsgaard; Holtan, Josephine Prener; Winge, Mona Irene & Rustad, Cecilie F. [Show all 11 contributors for this article] (2025). Clinical and genetic findings in 103 individuals in Norway with basal cell naevus syndrome. British Journal of Dermatology. ISSN 0007-0963. doi: 10.1093/bjd/ljaf413. Full text in Research Archive Show summary

  Background Basal cell naevus syndrome (BCNS) is a rare autosomal dominant condition characterized by early onset and multiple basal cell carcinomas (BCCs), skeletal and ocular abnormalities, and extracutaneous tumours and cysts. In most cases, BCNS is caused by a pathogenic variant in the tumour suppressor gene PTCH1. Pathogenic variants in SUFU account for a minority of cases. No clear genotype–phenotype associations between different PTCH1 variants have been established. Objectives To identify all individuals with BCNS in Norway, characterize their clinical and genetic profiles, and investigate possible genotype–phenotype associations. Methods In this cross-sectional study, we approached all individuals with BCNS registered at the Department of Dermatology at Oslo University Hospital and two national resource centres for rare medical conditions. Dermatologists, dentists and geneticists across Norway were contacted in order to identify additional individuals with BCNS. Data were collected from structured interviews, whole-body physical examinations, electronic medical records, radiographic imaging and molecular genetic analyses. Results We identified 109 individuals with BCNS, indicating a national prevalence of BCNS of at least 1.9 per 100 000, of whom 103 agreed to be included. Clinical findings confirmed the considerable phenotypic variation in BCNS, including BCC in 61 individuals (median number of BCCs 48, range 1–1025), odontogenic keratocysts in 72 (median number of odontogenic keratocysts 5, range 1–30) and a wide spectrum of ocular and skeletal abnormalities in 43 and 98 individuals, respectively. This study is the first to report the prevalence estimates of autism (4%) and epilepsy (7%), as well as intracranial lesions associated with epilepsy, in BCNS. Genetic analyses identified a pathogenic or probable pathogenic PTCH1 variant in 93 individuals, while 5 individuals had variants of uncertain clinical significance. Twenty-one of the pathogenic PTCH1 variants were novel. None of the individuals with PTCH1 variants in exon 1, all belonging to the same family, exhibited BCCs, odontogenic keratocysts or palmoplantar pitting. Conclusions This study expands the number of pathogenic PTCH1 variants, elucidates important clinical aspects in BCNS and reveals novel insight to genotype–phenotype associations, providing new implications for management and follow-up.

• Skullerud, Kristin Helene; Gjersvik, Petter; Eberhard-Gran, Malin; Pripp, Are Hugo; Qvigstad, Erik & Vangen, Siri [Show all 7 contributors for this article] (2024). Sexual Distress and Quality of Life in Women With Genital Erosive Lichen Planus—A Cross-sectional Study. Journal of Lower Genital Tract Disease. ISSN 1089-2591. 29(1). doi: 10.1097/LGT.0000000000000847. Full text in Research Archive Show summary

  Objective: The study aimed to assess sexual distress and quality of life in women with moderate-to-severe genital erosive lichen planus (GELP). Materials and Methods: Thirty-six women with GELP were recruited at the Oslo University Hospital in Norway. The diagnosis was confirmed by a dermatologist with experience in vulvovaginal disease and based on characteristic clinical changes in the vulva and/or vagina, and biopsy results if available. Clinical severity was measured using the GELP score with a score ≥5 required for inclusion. Sexual distress was measured using the revised Female Sexual Distress Scale (FSDS-R), and quality of life was measured using the Dermatology Life Quality Index (DLQI). Topical steroid treatment was allowed. Results: The mean FSDS-R score was 22.7 (range 0–45) with 27 women reporting high scores for sexual distress (FSDS-R score >15). The mean DLQI score was 8.8 (range 1–19) with 15 women reporting a moderate impact (DLQI score 6–10), and 12 women reporting a very large impact (DLQI score 11–20) of GELP on their quality of life. No clear correlations were found between disease severity assessed by GELP scores and FSDS-R or DLQI scores. Age was not correlated with FSDS-R or DLQI scores. Conclusions: These results demonstrate that a substantial number of women with GELP experience sexual distress and a reduced quality of life.

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• Perrier, Flavie; Rimal, Raju; Green, Adele C; Rueegg, Corina Silvia; Ghiasvand, Reza & Gjersvik, Petter [Show all 13 contributors for this article] (2026). Breslow thickness and melanoma-specific death in patients diagnosed with thin cutaneous melanoma in 1983-2019. Full text in Research Archive
• Bretthauer, Michael & Gjersvik, Petter (2025). Stepwise Wedge Cluster Randomization. Tidsskrift for Den norske legeforening (Tidsskriftet). ISSN 0029-2001. 145(8). doi: 10.4045/tidsskr.25.0094. Full text in Research Archive
• Gjersvik, Petter & Benestad, Haakon Breien (2025). Medisinerbare genforandringer. Tidsskrift for Den norske legeforening (Tidsskriftet). ISSN 0029-2001. 145(4), p. 1–3. doi: 10.4045/tidsskr.24.0010. Full text in Research Archive
• Gjersvik, Petter & Benestad, Haakon Breien (2024). Aldringsceller og cellulær aldring. Tidsskrift for Den norske legeforening (Tidsskriftet). ISSN 0029-2001. 144(3). doi: 10.4045/tidsskr.23.0780. Full text in Research Archive

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