Meta-Analysis Links Breast Cancer to Prostate Cancer Risk
Introduction
A recent meta-analysis has examined the relationship between breast cancer and prostate cancer risk, focusing on whether a history of breast cancer in first-degree relatives increases prostate cancer risk in men. Prostate cancer ranks as the second most frequently diagnosed cancer among men in many Western countries and is a significant cause of morbidity and mortality, being the fifth leading cause of cancer-related deaths.
Understanding Prostate Cancer Risk Factors
While the exact causes of prostate cancer remain elusive, several risk factors have been identified, including age, ethnicity, geographic location, genetic predispositions, and family history. Unlike modifiable risks such as smoking, many of these factors are beyond an individual’s control.
The Impact of Genetic Mutations
Prostate cancer can arise from alterations in the DNA of prostate cells, which can be inherited from parents. Some genetic mutations associated with prostate cancer can be passed down through generations. Several inherited mutations have been linked to hereditary prostate cancer, although some mutations may also develop during a person’s lifetime.
Link Between Breast Cancer and Prostate Cancer
Research has indicated that an elevated risk of breast cancer may correlate with an increased risk of prostate cancer in men. Mutations in the BRCA1 and BRCA2 genes are well-established as risk factors for breast cancer and have recently been associated with a heightened risk of prostate cancer in men. However, the precise relationship between a first-degree family history of breast cancer and prostate cancer risk remains unclear.
New Study Evaluates the Connection
Recent analyses have sought to clarify the correlation between first-degree family history of breast cancer and prostate cancer risk, though results have been mixed. A team of researchers from Sichuan University in China conducted a systematic review and meta-analysis encompassing studies published from 1928 to December 18, 2018. This analysis, featured in BMC Cancer, included 18 studies from America, Europe, and Asia. Among these, 13 studies focused on breast cancer in first-degree relatives, with 11 studies examining mothers and 10 studies examining sisters.
Significant Findings from the Meta-Analysis
The meta-analysis revealed a noteworthy association between a history of breast cancer in first-degree relatives and an increased risk of prostate cancer. This connection was consistent across regions including America, Europe, and Asia. Specifically, a family history of breast cancer in mothers was associated with prostate cancer incidence in America, while this association was not observed in Europe and Asia. Additionally, a family history of breast cancer in sisters was found to correlate with prostate cancer risk, but a history of breast cancer in daughters did not show a similar association. The study also noted an increased risk of lethal prostate cancer among men with a family history of female breast cancer.
Implications for Prostate Cancer Risk Prediction
The presence of breast cancer in the family significantly predicts prostate cancer risk in men. Previous studies have indicated that men with a family history of prostate cancer may face double the risk of developing the disease. This meta-analysis further supports the notion that a family history of female breast cancer elevates prostate cancer risk. While the mechanisms linking these cancers remain unclear, genetic alterations may contribute to this association. Therefore, understanding family history regarding breast cancer is crucial for assessing prostate cancer risk in men.
Conclusion
This meta-analysis establishes a connection between breast cancer and prostate cancer risk, highlighting the importance of family history in understanding prostate cancer susceptibility. The findings underscore the need for further investigation into the underlying mechanisms that contribute to this relationship.
Written by Preeti Paul, M.Sc.
Reference: Zheng-Ju Ren et al., First-degree family history of breast cancer is associated with prostate cancer risk: a systematic review and meta-analysis. BMC Cancer 19, Article number: 871 (2019)