This would effectively prevent the ability of the man to be reproducing with little chance of reversing the process. This process is being undertaken by 1 in 6 American men and therefore any side effects that it might bring about by this procedure would have to be taken in seriously as well as looked in to in detail before a final conclusion can be made.
Prostate cancer is one of the commonest cancers among American men and is second only to lung cancers in the number of deaths that it causes in the same group. Testicular cancer on the other hand, only accounts for about 1% of all cancers in men and is usually detected between the ages of 35 to 50 years with better prognostic outcomes than most of the other cancers, if detected early.
In recent times, there had been much debate in health forums worldwide regarding the possible risk of elevated incidence of prostate and testicular cancers among those who undergo vasectomy. Few studies have brought evidence related to this which stirred up much controversy as to formulate large scale studies to assess the real situation and come out with recommendations regarding possible associations.
But, In March 1993, the National Institute of Child Health and Human Development (NICHD) under the patronage of National cancer institute and the national institute of diabetes and digestive and kidney disease called on for a conference to gather evidence and arrive at a conclusion regarding this problem.
According to expert groups, the analysis of past evidence from various studies and research is not conclusive or substantial in stating that vasectomy increased the risk of developing prostate cancer. At the same time, the panel is of the view that, even if vasectomy increases the likelihood of developing prostate cancer in men, the risk would be so small and would be statistically negligible. These conclusions were also being strengthened by the fact that, there wasn’t a biological explanation for vasectomy to increase the likelihood of prostate cancers that can be found through the research that has been done so far.
But, with relation to testicular cancer, the conclusion was that, vasectomy may increase the likelihood of progression or worsening of existing testicular cancer but do not show direct or indirect evidence of increasing the risk of developing testicular cancer at all.
Thus, accordingly, undergoing vasectomy can be pronounced safe and effective as a contraceptive method for males.
Ref: http://www.cancer.gov/cancerto pics/factsheet/Risk/vasectomy