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Long-term outcomes of preventing premature menopause during chemotherapy

24/12/2015

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Compared with receiving chemotherapy alone, women with breast cancer who also received the hormonal drug triptorelin to achieve ovarian suppression had a higher long-term probability of ovarian function recovery, without a statistically significant difference in pregnancy rate or disease-free survival, according to a study published in JAMA.

The majority of young women with invasive breast cancer are candidates to receive both chemotherapy and endocrine therapy. Loss of ovarian function and impaired fertility are possible consequences of anticancer treatments. Fertility concerns can affect treatment decisions of young women with breast cancer. Whether the administration of luteinizing hormone-releasing hormone analogues (LHRHa) during chemotherapy is a reliable strategy to preserve ovarian function is controversial owing to both the lack of data on long-term ovarian function and pregnancies and the safety concerns about the potential negative interactions between endocrine therapy and chemotherapy, according to background information in the article.

Lucia Del Mastro, M.D., of the Istituto Nazionale per la Ricerca sul Cancro, Genova, Italy and colleagues randomly assigned 281 premenopausal women (median age, 39 years) with stage I to III hormone receptor-positive or hormone receptor-negative breast cancer to receive chemotherapy alone (control group) or chemotherapy plus triptorelin (LHRHa group). The trial was conducted at 16 Italian sites. Women were enrolled between October 2003 and January 2008; last annual follow-up was June 2014. Median follow-up was 7.3 years.
The 5-year cumulative incidence estimate of menstrual resumption was 73 percent among the 148 patients in the LHRHa group and 64 percent among the 133 patients in the control group. Eight pregnancies (5-year cumulative incidence estimate of pregnancy, 2.1 percent) occurred in the LHRHa group and 3 (5-year cumulative incidence estimate of pregnancy, 1.6 percent) in the control group. Five-year disease-free survival was 80.5 percent in the LHRHa group and 84 percent in the control group. This increased but statistically nonsignificant risk appeared specific to the patients with hormone receptor-negative tumors.

The authors write that these results, together with the findings of another study (POEMS-SWOG S0230), "indicate that, in addition to fertility preservation strategies such as embryo and oocyte cryopreservation, temporary ovarian suppression with LHRHa is an option to preserve ovarian function in premenopausal women with early stage breast cancer receiving adjuvant chemotherapy."

Lambertini et al. Ovarian Suppression With Triptorelin During Adjuvant Breast Cancer Chemotherapy and Long-term Ovarian Function, Pregnancies, and Disease-Free Survival. A Randomized Clinical Trial. JAMA. 2015;314(24):2632-2640. doi:10.1001/jama.2015.17291 [Abstract]
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