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Advancements in Fertility Preservation Provide Oncology Patients New Options
Many young people who’ve just learned that they have cancer also are told that the therapies that may save their lives could rob them of their ability ever to have children. Infertility caused by chemotherapy and radiation affects a sizable population: Of the 1.5 million people diagnosed with cancer in 2009, nearly 10 percent were still in their reproductive years.
The good news, according to an article in the January issue of Mayo Clinic Proceedings, is that techniques to harvest and store reproductive cells have vastly improved in the last several years. “Fertility preservation is still an emerging discipline,” says Mayo Clinic reproductive endocrinologist Jani Jensen, M.D., lead author of the paper, “but rapid advances in technology in the last several years are now providing new options for patients.”
In the review, a team of Mayo researchers look at both long-standing and emerging fertility preservation technologies. Freezing sperm remains a stable and reliable technique, but one approach that has had considerable success in the last five years involves freezing eggs harvested from women. “Cryopreservation of eggs used to be considered the Holy Grail of therapy, not just for cancer patients, but for any woman who wanted to halt the biological clock,” says Dr. Jensen. Oocytes are particularly fragile cells that rupture easily, and even though research to preserve them dates back to the 1970s, the first successful birth from a stored egg didn’t occur until the mid-1980s. “But in the last five years,” Dr. Jensen says, “there have been considerable improvements in freezing technology. Since 2004, there have been thousands of babies born worldwide from frozen eggs.”
One long-standing and familiar approach available to cancer patients remains the freezing of embryos. “Embryos are hardy, and can survive the freezing and thawing process better than individual eggs, so they actually have a better chance of creating a successful pregnancy,” Dr. Jensen explains. The approach may be a good fit for patients who are married or have a long-term partner, she adds, but it’s not necessarily an answer for the youngest cancer patients.