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Pharmacotherapeutics of capecitabine and trastuzumab in the treatment of metastatic breast cancer

13 February 2020
Volume 29 · Issue 3

Abstract

Metastatic HER2-positive breast cancer is an incurable disease with a poor prognosis. This article presents a critical appraisal of two treatments commonly used in the treatment of metastatic HER2-positive breast cancer: the oral chemotherapy drug, capecitabine, and the monoclonal antibody, trastuzumab. What follows is a critical discussion of the pharmacotherapeutics of capecitabine and trastuzumab, which considers their use both as single agents and as a combination regimen in the treatment of metastatic breast cancer. The implications of side effects of these drugs are discussed, both individually and in combination, as are the challenges these bring to the prescriber. The article evaluates the use of these agents and concludes that the combination of capecitabine and trastuzumab is an attractive treatment option for patients and for the prescriber.

The human breast develops as a result of genetic and hormonal stimulus from skin precursor cells, known as ectoderm, occurring during the fourth week of embryonic development (Sadler, 2009). Unlike most other organs, which develop to maturity at the embryonic stage, the female breast only reaches a matured functioning state in adulthood during the pregnancy-lactation cycle (Hassiotou and Geddes, 2013). It is comprised of adipose and glandular tissue supported by connective tissue called ‘Cooper's ligaments’ (Gefen and Dilmoney, 2007). The glandular tissue drains via the ductal system (Hassiotou and Geddes, 2013) where each duct wall consists of two layers of epithelial cells all fixed within a fibrous stroma (Visvader, 2009). The innermost layer contains cuboidal epithelial cells, some of which can transform into milk-secretory cells during lactation. It is these epithelial cells where the majority of breast malignancies begin (Li et al, 2003). The exterior layer consists of contractile myoepithelial cells, which encapsulate the inner layer and have attributes of smooth muscle cells (Tezer et al, 2011).

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