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Future Oncol. 2019 Nov;15(32):3675-3682. doi: 10.2217/fon-2019-0258. Epub 2019 Sep 12.

The NEOLETEXE trial: a neoadjuvant cross-over study exploring the lack of cross resistance between aromatase inhibitors.

Author information

1
Department of Oncology, Akershus University Hospital (AHUS), Lørenskog, Norway.
2
Department of Breast & Endocrine Surgery (AHUS), Akershus University Hospital, Lørenskog, Norway.
3
Translational Cancer Research Group, Akershus University Hospital, Lørenskog, Norway.
4
Department of Pathology (AHUS), Akershus University Hospital, Lørenskog, Norway.
5
Institute of Clinical Medicine, Campus AHUS, University of Oslo, Norway.
6
Department of Gene Technology (AHUS), Akershus University Hospital, Lørenskog, Norway.
7
Health Services Research Center (AHUS), Akershus University Hospital, Lørenskog, Norway.
8
Department of Clinical Molecular Biology (AHUS/EpiGen), Akershus University Hospital, Lørenskog, Norway.

Abstract

The aromatase inhibitor letrozole (Femar®/Femara®) and the aromatase inactivator exemestane (Aromasin®) differ in their biochemical effect on the aromatase enzyme. Letrozole is a competitive aromatase inhibitor while exemestane binds irreversibly to the aromatase enzyme. This pharmacological difference is of clinical interest since a lack of cross-resistance has been documented. It has been demonstrated in several clinical trials that exemestane may cause a disease regression following resistance to nonsteroidal aromatase inhibitors. The exact mechanism(s) behind this phenomenon is yet unknown. Here, we present the NEOLETEXE trial with the aim of exploring the individual mechanisms involved behind the observed lack of cross resistance. Clinical trial registration: The trial has been approved by the Regional Ethics Committee of South-East Norway (project number 2015/84).

KEYWORDS:

aromatase inhibitor; breast cancer; exemestane; letrozole; neoadjuvant

PMID:
31513453
DOI:
10.2217/fon-2019-0258
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