Final answer:
The continent with the lowest prevalence of prostate cancer is not provided, but patterns of overall cancer rates suggest lower prevalence in less developed regions. Prostate cancer is common in men in Western countries and is a slow-growing cancer, with PSA and PCA3 used for screening.
Step-by-step explanation:
The continent with the lowest prevalence rate of prostate cancer is not explicitly mentioned in the provided statistics. However, considering the overall pattern of cancer prevalence, areas like Southern Asia, Australia and the Pacific are mentioned to have a low prevalence of HIV, which might correlate to better health outcomes in general but does not directly indicate the prevalence of prostate cancer. On the other hand, the United States is known to have a higher overall cancer rate, potentially suggesting a higher prevalence of prostate cancer as well, which is consistent with this being a common type of cancer in Western countries. Prostate cancer typically affects older men and is a slow-growing cancer that is the most common type of cancer in men. Decisions regarding screening, such as with the PSA or PCA3 tests, depend on a variety of factors including age, family history, and the potential benefits and risks of treatment.