[Procedures for fertility preservation in female cancer patients]

Improving survival rates and quality of life following modern combined cancer treatments have resulted a growing number of patients requesting maintenance of reproductive functions. Several methods are currently available to maintain fertility during oncotherapy. Even though most of them are still experimental and their efficacy and safety have not been determined, the future for fertility preservation in women with cancer is promising. In vitro fertilization with embryo cryopreservation offers an established method, but time to delay cancer treatment could be risky regarding the progression of several cancer types. Moreover, exposure to a high oestrogen milieu during ovarian stimulation is undesirable when patients have estrogen-sensitive malignant tumours. Cryopreservation of mature oocytes following in vitro fertilization and intracytoplasmatic sperm injection offers advantages, but it is still limited due to its low success rate. Emerging techniques of ovarian tissue cryopreservation followed by autotransplantation have been clinically explored. Novel technologies of tissue freezing and thawing promise improving results. However, only one live birth following autotransplanted frozen-thawed ovarian tissue has been established. This procedure can be offered in the future for prepubertal girls before cancer treatment to maintain future fertility. Gonadal tissue cryopreservation and transplantation should be considered experimental in humans for the present time until greater evidence regarding efficacy and safety is accrued.