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A Case Study 7 Mrs Mei Li Huong

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Applied Pathophysiology – Case Study 7 Mrs Mei-Li Huong 1. The Cell cycle consists of various phases, G 1 (growth& preparation of DNA), S (DNA synthesis), G 2 (cell preparation to divide), Mitosis (where chromosomes separate & the cell divides) and G0 (where non-dividing cells exit from the cycle). Cytotoxic therapy is the use of chemotherapy to disturb cellular growth by causing damage to the DNA and impairing cell function (Dougherty & Lister, 2011 p. 870). By affecting the growth and replication of these cells, treatments for patients diagnosed with cancer may be controlled and possibly cured. Chemotherapy agents are classified as cell cycle specific such as Taxotere & cell cycle non- specific (Adriamycin & Cyclophosphamide). These agents are often administered in combination as they act on different parts of the cell cycle to maximise disease control. The three chemotherapy agents Mrs Huong received are Taxotere, Adriamycin and Cyclophosphamide, a chemotherapy protocol known as TAC. Taxotere is an antimicrotubule agent which promotes microtubule assembly and stability, therefore blocking the cell cycle in mitosis (Sanofi, 2013 retrieved 4/2/2015). Adriamycin is an anthracycline and works by forming free radicals that break DNA strands and inhibit DNA synthesis. Furthermore, anthracyclines inhibit the enzyme topoisomerase as this enzyme assists DNA repair and replication (Caponigro F 2005). Cyclophosphamide is an alkylating agent and works by attacking

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