New York: Even though success rates in achieving pregnancy with frozen sperm are high, not many men take advantage of sperm preservation before they undergo cancer treatment that can make them sterile, Spanish investigators report.
"Amazingly, the number of males banking sperm under these circumstances is extremely low in comparison with the number of newly diagnosed tumours in men younger than 40-45 years of age," Dr Marcos Meseguer and his team note in an article in the medical journal Fertility and Sterility.
The researchers' report on success rates with frozen sperm might encourage more young male cancer patients to go through the process.
Meseguer, from Instituto Valenciano de Infertilidad, and his team reviewed the outcomes for 186 men who had their sperm frozen before undergoing cancer treatment.
Six months after treatment, analysis of 41 new semen samples showed that 30 per cent had recovered normal sperm production but the other 70 per cent had low or absent sperm counts.
Some patients destroyed their samples once normal sperm production was restored after cancer treatment. However, the researchers caution, "we can not be sure whether the sperm production is not genetically or structurally affected, and consequently until pregnancy is reached, samples should be kept frozen."
Approximately 15 per cent of the men needed the sperm samples several years later.
The researchers compared the outcomes of in vitro fertilisation or other assisted reproductive procedures using the preserved sperm with that of couples being treated because of female infertility.
