[Immunosuppressive therapy and fertility preservation: Indications and methods]

Fertility preservation is routinely performed in cancerology but less systematically used in the field of immune diseases, even though the use of gonadotoxic treatments in young patients may be required and even though the disease itself can alter fertility. This review aimed to clarify the indications and methods of fertility preservation in this context. Cyclophosphamide is the only immunosuppressive drug requiring fertility preservation in women. In men, fertility preservation should be proposed before treatment with cyclophosphamide, methotrexate, mycophenolate mofetil or mTOR inhibitors. Other factors inherent to the disease or the patient may alter fertility. Thus, screening for infertility and fertility preservation have to be implemented as much as possible to increase the chances of successful procreation in patients with immune disease. For women, the choice between the different preservation methods depends on the patient's age, disease activity, the time available before the start of treatment, the possibility of future pregnancy and the woman's and even couple's wishes. Before puberty, the only accepted method is cryopreservation of ovarian tissue. After puberty, the first-line method is the cryopreservation of mature oocytes. If the treatment has to be started in an emergency, if ovarian hyperstimulation/oocyte retrieval is contraindicated or if the patient refuses this option, cryopreservation of ovarian tissue or GnRH agonists could be proposed. For men, the accepted method is sperm cryopreservation. For prepubertal boys, the cryopreservation of spermatogonia after testicular biopsy is still experimental.