Abstract
As a heterogeneous disease, breast cancer can be divided into distinct subtypes. Among the two major subsets of estrogen receptor-negative (ER−) and ER-positive (ER+) tumors, the ER− is a more aggressive subtype, more difficult to treat, has greater ethnic disparity concerns, worse prognosis, and almost twice the risk of mortality. We provide here a fundamental delineation of N w-hydroxy-l-arginine as a sensitive and reliable ethnic specific indicator for ER− breast cancer early-prognosis (United States provisional patent application number 62232816).

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The University of New England Office of Research and Scholarship, and the College of Pharmacy provided funding support to this study.
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As authors of this manuscript, we declare no conflict of interest; either financial or otherwise.
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No human participants were directly involved with this project. All blood samples used in this study came from bio-banks.
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Only de-identified patient samples from bio-banks were used for this study, thus exempting informed consent requirement.
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Mohan, S., Moua, N. & Harding, L. N w-hydroxy-l-arginine as a novel ethnic specific indicator of estrogen-negative breast cancer. Amino Acids 48, 2693–2698 (2016). https://doi.org/10.1007/s00726-016-2301-5
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DOI: https://doi.org/10.1007/s00726-016-2301-5