Author/Editor		Ribnikar, Domen; Sousa, Berta; Čufer, Tanja; Cardoso, Fatima
Title		Extended adjuvant endocrine therapy
Type		članek
Vol. and No.		Letnik 32, št. 1
Publication year		2017
Volume		str. 112-118
ISSN		1532-3080 - Breast (Edinburgh, Scotland)
Language		eng
Abstract		Patients with estrogen receptor-positive (ER +) early breast cancer (EBC) are at a continuous risk for distant relapse despite 5 years of standard endocrine therapy, even after 10-15 years after primary diagnosis. Hence, large randomized clinical trials were conducted to evaluate the role of extended endocrine treatment (ET) with the primary goal to prevent or at least delay distant relapse. Two very large trials of extended tamoxifen (TAM), the ATLAS and the aTTom trial, proved the efficacy of prolonged TAM particularly important after 10 years due to the carry-over effect of the five initial years. Additionally, the extended use of AIs after 5 years of tamoxifen, also proved to be efficacious in preventing late distant relapses. For letrozole (LET) it was shown in the MA.17 trial that it also improves overall survival (OS) in node-positive BC patients. There are many options and still unanswered questions related to extended ET, which are discussed in this review. The most important issue in deciding prolonged duration of ET is undoubtfully how to identify ER+ patients who benefit most from this approach. With this purpose, not only classical pathological factors have been studied, but also molecular profiles of individual tumors, which might help us in the near future to better tailor ET. Not only efficacy, but also toxicity of such prolonged treatment is essential for optimal use, particularly maintained compliance in a routine clinical practice. These issues are discussed in this review.
Keywords		zgodnji rak dojke estrogenski receptor tveganje ponovitve endokrino zdravljenje tamoksifen zaviralci aromataze ER-positive early breast cancer risk of relapse extended endocrine therapy tamoxifen aromatase inhibitors