[3][4] In the early 2000s, Weiderpass started to work in Sub-Saharan Africa with the International Agency for Research on Cancer.

[2] Her research considers women's health, with a particular focus on identifying risk factors for certain forms of cancer.

[6] Weiderpass found several lifestyle risk factors, such as tobacco use, diet and obesity, can have a marked impact on a person's likelihood to suffer from cancer.

[2] In 2007, Weiderpass was made Head of the Genetic Epidemiology Group at the Folkhälsan Research Center in Helsinki, where she spent over ten years.

[10] She partnered with the European Society for Medical Oncology in 2020, working together to deliver a series of webinars and e-learning modules focussed on the elimination of cancer.