Fertilitätserhalt bei Patientinnen mit Mammakarzinom – eine aktuelle Übersicht

Zusammenfassung

Bei vielen prämenopausalen Patientinnen, die an einem Mammakarzinom erkranken, ist die Familienplanung noch nicht abgeschlossen, sodass für den Erhalt des fertilen Potenzials Maßnahmen der Fertilitätsprotektion sinnvoll sind. Durch eine Polychemotherapie – unabhängig ob im neoadjuvanten oder adjuvanten Setting – kommt es zu einer irreversiblen Schädigung der Follikel, was unter Umständen zu einer permanenten Infertilität führen kann. Abhängig von den verwendeten Zytostatika und der altersabhängigen Ovarialreserve der Frau, muss das gonadotoxische Risiko als niedrig, mittel oder hoch eingeschätzt werden. Möglichkeiten des Fertilitätserhalts sind: a) die Kryokonservierung von fertilisierten oder unfertilisierten Oozyten. Hierbei werden nach ovarieller Hyperstimulation reife Oozyten mittels transvaginaler Follikelaspiration gewonnen und im Anschluss entweder unfertilisiert oder nach erfolgter IVF- oder ICSI-Behandlung kryokonserviert. Bei b) der Kryokonservierung von Ovarialgewebe wird mithilfe eines laparoskopischen Eingriffs etwa 50 % des Ovarkortex eines Ovars reseziert und kryokonserviert. Die Verwendung von c) GnRH-Agonisten als medikamentöse Therapieoption unternimmt den Versuch einer endokrinen Ovarialsuppression, um Oozyten, Granulosa- und Thekazellen vor dem zytotoxischen Einfluss der Chemotherapie zu schützen.

Abstract

Many premenopausal patients who develop breast cancer have not yet completed their family planning, so measures of fertility protection to preserve their fertile potential would be beneficial. Polychemotherapy causes irreversible damage to the ovarian follicles – irrespective of whether in a neoadjuvant or adjuvant setting – and this can sometimes result in permanent infertility. Depending on which cytostatic agents are used and on the age-related ovarian reserve of the woman, gonadotoxic risk must be classified as low, moderate or high. Options of fertility preservation include: a) cryopreservation of fertilised or unfertilised oocytes. After ovarian hyperstimulation, mature oocytes are retrieved by transvaginal follicle aspiration, after which they are cryopreserved, either unfertilised or on completion of IVF or ICSI treatment. During b) cryopreservation of ovarian tissue, about 50 % of the ovarian cortex of one ovary is resected with the aid of a laparoscopic procedure and cryopreserved. The application of c) GnRH agonists as a medicinal therapy option is an attempt at endocrine ovarian suppression in order to protect oocytes, granulosa cells and theca cells from the cytotoxic effect of chemotherapy.

Schlüsselwörter

Mammakarzinom - Fertilitätserhalt - Kryokonservierung - Oozyten - Ovargewebe - GnRH-Agonisten

Key words

breast cancer - fertility preservation - cryopreservation - oocytes - ovarian tissue - GnRH agonist

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