Silvie Janssen

Ms. Silvie Janssen

Netherlands Cancer Institute
orcid

Research Focus & Metrics

Academic Career Length

9Years (2018-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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28 September 2021 in Cancers
Verified
Journal Article
Open access
PDF file
SJSilvie Janssen
Silvie Janssen
Winette van der GraafWinette van der Graaf
Winette van der Graaf
Daniël Jonathan van der MeerDaniël Jonathan van der Meer
Daniël Jonathan van der Meer
EMEveliene Manten-Horst
Eveliene Manten-Horst
Olga HussonOlga Husson
Olga Husson
Worldwide, more than 1.2 million adolescents and young adults (AYAs; those aged 15–39 years) are diagnosed with cancer each year. Although considerable variability exists according to cancer site and stage of disease, the 5-year relative survival at the time of diagnosis has been estimated at >80% for all AYA patients with cancer combined. Extensive survivorship research in recent decades has focused on patients diagnosed with cancer as children (39 years), yet few studies to date have reported outcomes specifically for patients diagnosed as AYAs. With increasing incidence and improving survival for many tumor types, leading to the majority of AYA patients with cancer becoming long-term survivors, there is a critical need for research efforts to inform the survivorship care of this growing population. This article describes the population of AYA cancer survivors according to their epidemiology and late and long-term effects, the challenges and models of AYA survivorship care, as well as future opportunities for research and healthcare.

29 April 2023 in Cancer Medicine
Verified
Journal Article
Open access
SJSilvie Janssen
Silvie Janssen
CVCarla Vlooswijk
Carla Vlooswijk
EMEveliene Manten‐Horst
Eveliene Manten‐Horst
SSSophia H. E. Sleeman
Sophia H. E. Sleeman
RBRhodé M. Bijlsma
Rhodé M. Bijlsma
Olga HussonOlga Husson
Olga Husson
Background: Despite growing (inter)national awareness and appreciation, age‐specific care is still not always self‐evident and accepted as standard of care for adolescent and young adult (AYA) cancer patients. It is unknown whether long‐term AYA cancer survivors have missed age‐specific care, and if so, which survivors missed it and regarding which topics.Methods: The Netherlands Cancer Registry (NCR) identified all long‐term AYA cancer survivors (aged 18–39 years at initial cancer diagnosis, 5–20 years past diagnosis) in the Netherlands, who were invited to participate in a population‐based, observational, cross‐sectional questionnaire study (SURVAYA study), including questions on care needs.Results: In total, 3.989 AYAs participated (35.3% response rate). One‐third of them had a need for age‐specific care (33.5%), 41.2% had no need and 25.3% did not know whether they had a need. Those who had a need for age‐specific care were significantly more often female, higher educated, diagnosed at a younger age, and treated with chemotherapy, radiotherapy or hormone therapy. Most frequent topics were disease and treatment (29.7%), emotions (24.1%), friends (22.6%), family and children (15.6%), fertility and pregnancy (14.8%), work and reintegration (10.5%), care not tailored (13.8%), and overarching care and life (27.7%). Palliative care (0.0%), spirituality (0.2%), death (0.7%), complementary care (0.7%), and late effects (1.3%) were mentioned least.Conclusions: A substantial proportion of long‐term AYA cancer survivors showed a need for age‐specific care, varying by sociodemographic and clinical factors, on a wide variety of topics, which could be targeted to improve current AYA care services.

29 July 2022 in Current Oncology
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Journal Article
Open access
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CVCarla Vlooswijk
Carla Vlooswijk
LPLonneke V. van de Poll-Franse
Lonneke V. van de Poll-Franse
SJSilvie Janssen
Silvie Janssen
EDEsther Derksen
Esther Derksen
MRMilou Reuvers
Milou Reuvers
Olga HussonOlga Husson
Olga Husson
Background: Participation of Adolescents and Young Adults with cancer (AYAs: 18–39 years at time of diagnosis) in patient-reported outcome studies is warranted given the limited knowledge of (long-term) physical and psychosocial health outcomes. We examined the representativeness of AYAs participating in the study, to observe the impact of various invitation methods on response rates and reasons for non-participation. Methods: A population-based, cross-sectional cohort study was performed among long-term (5–20 years) AYA cancer survivors. All participants were invited using various methods to fill in a questionnaire on their health outcomes, including enclosing a paper version of the questionnaire, and sending a reminder. Those who did not respond received a postcard in which they were asked to provide a reason for non-participation. Results: In total, 4.010 AYAs (response 36%) participated. Females, AYAs with a higher socio-economic status (SES), diagnosed more than 10 years ago, diagnosed with a central nervous system tumor, sarcoma, a lymphoid malignancy, stage III, or treated with systemic chemotherapy were more likely to participate. Including a paper questionnaire increased the response rate by 5% and sending a reminder by 13%. AYAs who did not participate were either not interested (47%) or did want to be reminded of their cancer (31%). Conclusions: Study participation was significantly lower among specific subgroups of AYA cancer survivors. Higher response rates were achieved when a paper questionnaire was included, and reminders were sent. To increase representativeness of future AYA study samples, recruitment strategies could focus on integrating patient-reported outcomes in clinical practice and involving AYA patients to promote participation in research.

27 June 2022 in ESMO Open
Verified
Journal Article
Open access
SJSilvie Janssen
Silvie Janssen
Daniël Jonathan van der MeerDaniël Jonathan van der Meer
Daniël Jonathan van der Meer
MEM.C.H.J. van Eenbergen
M.C.H.J. van Eenbergen
EME. Manten-Horst
E. Manten-Horst
Winette van der GraafWinette van der Graaf
Winette van der Graaf
Olga HussonOlga Husson
Olga Husson
Adolescent and young adult (AYA) cancer survivors, 18-39 years at initial cancer diagnosis, often self-report negative consequences of cancer (treatment) for their career. Less is known, however, about the objective impact of cancer on employment and financial outcomes. This study examines the employment and financial outcomes of AYA cancer survivors with nationwide population-based registry data and compares the outcomes of AYAs with cancer with an age- and sex-matched control population at year of diagnosis, 1 year later (short-term) and 5 years later (long-term). A total of 2527 AYAs, diagnosed in 2013 with any invasive tumor type and who survived for 5 years, were identified from the Netherlands Cancer Registry (clinical and demographic data) and linked to Statistics Netherlands (demographic, employment and financial data). AYAs were matched 1 : 4 with a control population based on age and sex (10 108 controls). Analyses included descriptive statistics, chi-square tests, independent samples t-tests, McNemar tests and logistic regression. AYA cancer survivors were significantly less often employed compared with their controls 1 year (76.1% versus 79.5%, P < 0.001) and 5 years (79.3% versus 83.5%, P < 0.001) after diagnosis, and received more often disability benefits (9.9% versus 3.1% 1 year after diagnosis, P < 0.001; 11.2% versus 3.8% 5 years after diagnosis, P < 0.001). Unemployed AYAs were more often diagnosed with higher disease stages (P < 0.001), treated with chemotherapy (P < 0.001), radiotherapy (P < 0.001) or hormone therapy (P < 0.05) and less often with local surgery (P < 0.05) compared with employed AYAs 1 and 5 years after diagnosis. Based on objective, nationwide, population-based registry data, AYAs’ employment and financial outcomes are significantly affected compared with age- and sex-matched controls, both short and long-term after cancer diagnosis. Providing support regarding employment and financial outcomes from diagnosis onwards may help AYAs finding their way (back) into society.

14 March 2018 in Nutrition and Cancer
Verified
Journal Article
Closed access
MVMerel R. van Veen
Merel R. van Veen
Renate WinkelsRenate Winkels
Renate Winkels
SJSilvie Janssen
Silvie Janssen
EKEllen Kampman
Ellen Kampman
SBSandra Beijer
Sandra Beijer
We investigated whether obtaining nutritional information influences reported changes in dietary behavior in cancer survivors and their relatives and whether nutritional information needs influence this association. We included 239 cancer survivors and their relatives, recruited from an online panel of cancer survivors and relatives. This panel completed a survey about their experiences with nutritional information provision by healthcare professionals and the media in the period after diagnosis, their information needs regarding nutrition and cancer, and whether they changed their dietary behavior since diagnosis. The survey showed that 56% of respondents obtained nutritional information, mostly during treatment. Respondents who obtained nutritional information more often reported to have altered their dietary behavior after diagnosis. This association was not altered by having information needs. The reported changes in dietary behavior were coherent with the recommendations of the World Cancer Research Fund: respondents reported to choose less products that promote weight gain, increased intake of plant foods, and decreased meat and alcohol use. Respondents who obtained nutritional information more often changed their dietary behavior, regardless whether they had nutritional information needs. This might be an indication that healthcare professionals should provide nutritional information not only to those expressing a need for nutritional information.

6 June 2023 in JNCI: Journal of the National Cancer Institute
Verified
Journal Article
Closed access
PDF file
TSTies M Siebinga
Ties M Siebinga
SJSilvie Janssen
Silvie Janssen
ABAnke W Boumans
Anke W Boumans
MEMies C Van Eenbergen
Mies C Van Eenbergen
BSBettina Siflinger
Bettina Siflinger
Olga HussonOlga Husson
Olga Husson
Background: The patterns and determinants of long-term income among adolescent and young adult (AYA) cancer survivors, and the differences compared with peers, have not yet been fully explored. This study investigated the long-term effects of cancer on the income of AYA cancer survivors. Methods: The Netherlands Cancer Registry identified all AYA cancer patients (aged 18-39 years) diagnosed in 2013 and alive 5 years postdiagnosis. Clinical data of the selected AYA patients were linked to individual, administrative real-world labor market data of Statistics Netherlands. The control group consisted of a random sample of individuals of the same age, sex, and migration background without cancer. Data on 2434 AYA cancer patients and 9736 controls were collected annually from 2011 until 2019. Changes in income level were measured and compared with the control group using difference-in-difference regression models. Results: AYA cancer survivors experience, on average, an 8.5% decrease in annual earnings, relative to the control population. The effects are statistically significant and permanent (P < .01). Younger AYAs (those aged 18-25 years 15.5% income reduction), married cancer survivors (12.3%), females (11.6%), those diagnosed with stage IV disease (38.1%), and central nervous system (15.7%) cancer patients experienced the largest decline in income, on average, relative to controls, all else constant. Conclusion: Although dependent on the sociodemographic and clinical characteristics, a cancer diagnosis at AYA age has significant implications on the income of cancer patients. Awareness of vulnerable groups and the development of policies to mitigate the financial impact of cancer are critical.