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Olaf Johan Hartmann

Olaf Johan Hartmann
Østfold Hospital Trust
Kalnesveien 300
1714 Grålum, NORWAY


Olaf Johan Hartmann is consultant at the breast and endocrine surgery department and part time researcher at Østfold Hospital Trust where he has been employed since 2014. He is a board member in the “National Network for Breast Cancer Research” and “Oslo Breast Cancer Research Consortium (OSBREAC)” in Norway.
He is an expert in breast and endocrine surgery at the Norwegian Patient Injury Compensation.
He studied Medicine in Hamburg followed by Oslo and became a specialist in general surgery 2009, breast and endocrine surgery 2013 (Norwegian). He defended his Doctoral Thesis “Breast-conserving therapy is better than mastectomy: Based on registry data form Norway” in year 2019. He changed surname from HartmannJohnsen to Hartmann in 2021. He became Fellow of the European Board of Breast surgery 2022. He is principal investigator in a pilot study, exploring the systemic impact of breast surgery by measuring circular RNA. He serves as a reviewer in several medical journals and has been an opponent for doctoral dissertations. He has 14 publications as author and co-author. However, more publications are planned. His main interests within breast cancer research are registry data, surgical impact on breast cancer, oncoplastic surgery and mechanisms of metastatic disease.

Most relevant papers

O. Hartmann
Hartmann-Johnsen OJ.
Thesis: Breast-conserving therapy is better than mastectomy: Based on registry data from Norway.
University of Oslo: Oslo; 2019. https://www.duo.uio.no/handle/10852/70594

O. Hartmann
Hartmann-Johnsen OJ, Kåresen R, Schlichting E, et al
Survival is Better After Breast Conserving Therapy than Mastectomy for Early Stage Breast Cancer: A Registry-Based Follow-up Study of Norwegian Women Primary Operated Between 1998 and 2008.
Ann Surg Oncol 2015;22(12):3836-45, doi:10.1245/s10434-015-4441-3

O. Hartmann
Hartmann-Johnsen OJ, Kåresen R, Schlichting E, et al.
Better survival after breast-conserving therapy compared to mastectomy when axillary node status is positive in early-stage breast cancer: a registry-based follow-up study of 6387 Norwegian women participating in screening, primarily operated between 1998 and 2009.
World J Surg Oncol 2017;15(1):118, doi:10.1186/s12957-017-1184-6

O. Hartmann
Hartmann-Johnsen OJ, Kåresen R, Schlichting E, et al.
Using clinical cancer registry data for estimation of quality indicators: Results from the Norwegian breast cancer registry.
Int J Med Inform 2019;125(102-109, doi:10.1016/j.ijmedinf.2019.03.004

O. Hartmann
Gondos A, Jansen L, Heil J, et al.
Time trends in axilla management among early breast cancer patients: Persisting major variation in clinical practice across European centers.
Acta Oncol 2016;55(6):712-9, doi:10.3109/0284186x.2015.1136751