Research Review on Physical Activity and Testicular Cancer

Introduction

A systematic review conducted by researchers in New Zealand aims to clarify the relationship between physical activity and testicular cancer. Positive news for fitness enthusiasts: the study found no evidence linking the two.

Testicular Cancer Overview

Testicular cancer primarily affects men aged 15 to 40 years. With an increase in global cases, researchers are investigating various risk factors associated with this condition. One area of focus is the role of physical activity in either increasing or decreasing the risk of developing testicular cancer.

Study Methodology

The New Zealand researchers performed a systematic review of existing literature to assess whether physical activity is related to an increased or decreased risk of testicular cancer. They examined potential associations, including the dose-response relationship and critical periods in life when physical activity might influence cancer risk. Their review encompassed studies available in databases such as Ovid Medline, Embase, Scopus, and Web of Science, up until November 11, 2016. The findings were published in the journal BMC Cancer.

Results of the Review

The initial database search returned 650 papers from various countries, covering research from 1970 to 2006. Ultimately, 13 studies were included in the final analysis, which evaluated the connection between physical activity and testicular cancer, ensuring a calculable 95% margin of scientific confidence.

Challenges and Conflicting Results

The researchers encountered several challenges that affected the clarity of their findings. The type and intensity of physical activity varied significantly among studies. Additionally, many studies relied on self-reported assessments, which could introduce personal bias. Notably, the cause-effect relationships presented conflicting results: while some studies indicated that physical activity increased the risk of testicular cancer, others suggested that it reduced that risk.

Conclusion

The research team concluded that there is no definitive evidence to support an association between physical activity and an increased risk of testicular cancer. They emphasized the necessity for further in-depth studies that utilize a standardized method or classification of physical activity. The researchers noted that the current lack of evidence does not imply that a relationship does not exist.

Reference

Huang, S., Signal, V., Sarfati, D., Shaw, C., Stanley, J., McGlynn, K., Gurney, J. (2018). Physical activity and risk of testicular cancer: a systematic review. BMC Cancer, 18(189). DOI https://doi.org/10.1186/s12885-018-4093-3