Background: As cancer is one of the main causes of fatal illnesses in the world, and breast
cancer is responsible for an elevated number of deaths in women, it is important to implement measures
to prevent this disease.
Method: In order to assess the influence of breastfeeding in preventing breast cancer in women,
forteen prospective cohort articles are included in this study, and their methodological quality has been
assessed through the Newcastle Ottawa quality assessment scale cohort studies. After determining the
risk of bias for each case study, those with fewer systematic errors and therefore greater validity, have
been selected to demonstrate the relationship they propose exists between breastfeeding and breast
Results: 50% percent of the research included found that breastfeeding does not reduce the risk of
breast cancer, while the other 50% argue that it is a protective factor. However, with regards to quality,
the case studies that conclude that breastfeeding is not associated with breast cancer have more evidential
Conclusion: It is difficult to establish whether or not breastfeeding prevents breast cancer, given the
diversity of conclusions in the literature. Nevertheless, the findings of this study reinforce the importance
of developing strategies to improve long-term women's health in the field of prevention.