About me

Currently, I am a postdoctoral researcher at the Centre for Translational Microbiome Research (CTMR), focusing on the role of the human microbiome in our longer-term health, particularly within gastrointestinal, women's health and cancer projects. A strong focus is on biostatistics, state-of-art microbiome techniques and combining microbiome data with large registries.

I received my main clinical training in Finland, academic education in Sweden, and obtained my doctoral degree in clinical epidemiology from Karolinska Institutet. During my doctoral studies, I gained a broad understanding of clinical research applying rigorous epidemiological methods and state-of-art analyses, taking advantage of various large nationwide and population-based Swedish health and administrative data registries.

Research description

CV: Candidate exam in 2009 (Helsinki, Finland). Master’s exam 2016, and doctorate in 2021, both at Karolinska Institutet. Postdoctoral researcher since 2021.

Supervision: Presently supervising 3 master students, of which 1 as a co-supervisor (Karolinska Institutet) and 2 as external main supervisor.


Selected publications (as the first author):

[PubMed ID: 35129052]. Simin J, Khodir H, Fornes R, Tamimi RM, Brusselaers N. Association between menopausal hormone therapy use and mortality risk: a Swedish population-based matched cohort study. Acta Oncologica; 2022. IF: 4.09.

[PubMed ID: 33861686]. Simin J, Liu Q, Wang X, Fall K, Williams C, Callens S, Engstrand L, Brusselaers N. Prediagnostic use of estrogen-only therapy is associated with improved colorectal cancer survival in menopausal women: a Swedish population-based cohort study. Acta Oncologica; 2021. IF: 4.09.

[PubMed ID: 32968205]. Simin J, Fornes R, Liu Q, Olsen R, Callens S, Engstrand L, Brusselaers N. Antibiotic use and the risk of colorectal cancer: a systematic review and dose-response meta-analysis. The British Journal of Cancer; 2020. IF: 7.64.

[PubMed ID: 32679181]. Simin J, Tamimi RM, Engstrand L, Callens S, Brusselaers N. Antibiotic use and the risk of breast cancer: A systematic review and dose-response meta-analysis. Pharmacological Research;  2020. IF: 7.66. 

[PubMed ID: 31836528]. Simin J, Liu Q, Fornes R, Brusselaers N. Safety of proton pump inhibitors questioned based on a large randomized trial of patients receiving rivaroxaban or aspirin. Gastroenterology; 2019. IF: 22.68.

[PubMed ID: 31584190]. Simin J, Tamimi RM, Callens S, Engstrand L, Brusselaers N. Menopausal hormone therapy treatment options and ovarian cancer risk: A Swedish prospective population-based matched-cohort study. International Journal of Cancer; 2019. IF: 7.40.

[PubMed ID: 28783542]. Simin J, Tamimi R, Lagergren J, Adami HO, Brusselaers N. Menopausal hormone therapy and cancer risk: An overestimated risk? European Journal of Cancer; 2017. IF: 9.16.

Other selected publications:

[PubMed ID: 35130922]. Fornes R, Simin J, Nguyen MH, Cruz G, Crisosto N, Van der Schaaf M, Engstrand L, Brusselaers N. Pregnancy, perinatal and childhood outcomes in women with and without polycystic ovary syndrome and metformin during pregnancy: a nationwide population-based study. Reproductive Biology and Endocrinology; 2022. IF: 4.79.

[PMID: 34291520]. Kamal H, Fornes R, Simin J, Stål P, Duberg A-S, Brusselaers N, Aleman S. Risk of hepatocellular carcinoma in hepatitis B and D virus co-infected patients: A systematic review and meta-analysis of longitudinal studies. Journal of Viral Hepatitis; 2021. IF: 3.73.

[PMID: 33857339]. Liu Q, Simin J, Debelius J, Fall K, Sadr-Azodi O, Engstrand L, Williams C, Brusselaers N. Menopausal hormone therapies and risk of colorectal cancer: a Swedish matched-cohort study. Alimentary Pharmacology and Therapeutics; 2021. IF: 8.17.

Other publications and texts:

Nele Brusslears; Johanna Simin. TRAITEMENT HORMONAL SUBSTITUTIF POUR LA MÉNOPAUSE ET CANCER : QUELS SONT LES RISQUES EN CAS D’UTILISATION CORRECTE ? [Onco Hemato (Vol. 15, n° 5, septembre-octobre 2021; p. 6-12)].

Johanna Simin, Nele Brusselaers, Shoahua Xie. Hormonterapi och lungcancermortalitet hos kvinnor - en systematisk litteraturstudie och metaanalys. BestPractice Lungmedicin; 2017. Svensk sammanfattning av: Hormone therapy and lung cancer mortality in women: Systematic review and meta-analysis.

Teaching portfolio


MSc thesis supervision at Karolinska Institutet and Antwerp University, Belgium.



MSc teaching at Karolinska Institutet: "How to conduct systematic reviews and meta-analyses" (lectures, and supervision).

MSc teaching at Antwerp University, Belgium: Research Methods in Global Health II (lectures, supervision, and examiner).