Larsen has worked at the Cancer Registry of Norway since 1998, and is now employed as a researcher at the Department of Registration.
She has since 2011 been the Editor-in-chief of our yearly publication «Cancer in Norway».
In recent years, she has participated in a research project led by the Women's Clinic at Rikshospitalet. The project aimed to investigate risk of cancer after fertility treatment in Norway.
She is now leading a project on cancer in immigrants. Larsen has also been involved in studies on data quality at the Cancer Registry.
She is a board member of the Janus Serum bank, menber of the reference group for the National Quality Register for colorectal cancer, where she is involved in various projects, and member of a national group on non-communicable diseases led by the Norwegian Institute of Public Health.
Larsen completed her Master of Science in Biology in 1996 at the University of Tromsø.
She completed her PhD at the Faculty of Medicine at the University of Oslo in 2007 with the dissertation: "Colorectal Cancer Screening by Flexible Sigmoidoscopy: Acceptance of Screening, Risk Factors for Neoplasia, and Impact of Screening on Future Health behaviour."
The dissertation was a part-project in the NORCCAP study. This was a randomized study on screening for colorectal cancer
Head: Immigrants and Cancer.
Participant: Cancer in women after treatment with IVF
Thøgersen H, Møller B, Robsahm TE, Aaserud S, Babigumira R, Larsen IK (2017)
Comparison of cancer stage distribution in the immigrant and host populations of Norway, 1990-2014
Int J Cancer, 141 (1), 52-61 PubMed 28369751
Reigstad MM, Storeng R, Myklebust TÅ, Oldereid NB, Omland AK, Robsahm TE, Brinton LA, Vangen S, Furu K, Larsen IK (2017)
Cancer Risk in Women Treated with Fertility Drugs According to Parity Status-A Registry-based Cohort Study
Cancer Epidemiol Biomarkers Prev, 26 (6), 953-962 PubMed 28108444
Robsahm TE, Aagnes B, Hjartåker A, Langseth H, Bray FI, Larsen IK (2013)
Body mass index, physical activity, and colorectal cancer by anatomical subsites: a systematic review and meta-analysis of cohort studies
Eur J Cancer Prev, 22 (6), 492-505 PubMed 23591454
Larsen IK, Bray F (2010)
Trends in colorectal cancer incidence in Norway 1962-2006: an interpretation of the temporal patterns by anatomic subsite
Int J Cancer, 126 (3), 721-32 PubMed 19688825
Larsen IK, Småstuen M, Johannesen TB, Langmark F, Parkin DM, Bray F, Møller B (2008)
Data quality at the Cancer Registry of Norway: an overview of comparability, completeness, validity and timeliness
Eur J Cancer, 45 (7), 1218-31 PubMed 19091545
Larsen IK, Grotmol T, Almendingen K, Hoff G (2007)
Impact of colorectal cancer screening on future lifestyle choices: a three-year randomized controlled trial
Clin Gastroenterol Hepatol, 5 (4), 477-83 PubMed 17363335 Pubmed: PUBMED