Anticancer drugs

Anticancer drugs

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  BACKGROUND ells divide andmultiply as the body needs them . when these cells continue multiplying whenC the body doesn't need them, the result is a mass or growth , also called a tumor . These growths are considered either benign or malignant . Each type of cancer is unique with its own causes, symptoms , and methods of treatment . Like with all groups of disease some types of cancer are more common than others . Cancer is one of the most common diseases in the world : 1 in 4 deaths are due to cancer Lung cancer is the most common cancer in men Breast cancer is the most common cancer in women There are over 100 different forms of cancer
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  The Cell Cycleand cancer Neoplasm-abnormal growth of cells not cancerneoplasms areBenign Encapsulated; Do not invade neighboring tissue or spread cancerousneoplasms areMalignant Not encapsulated; Readily invade neighboring tissues May also detach and lodge in distant places - metastasis
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  Characteristics of CancerCells Lack differentiation ( control ) Have abnormal nuclei Form tumors Mitosis controlled by contact with neighboring cells – contact inhibition Cancer cells have lost contact inhibition
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  Anti canser drug Definition: Anticancerdrugs are used to treat cancerous growths. Drug therapy may be used alone or in combination with other treatment such as surgery or radiation therapy. Purpose: Anticancer drugs are used to control the growth of cancerous cells. Cancer is commonly defined as uncontrolled growth of cell, with loss of other tissues and organs. Cancers are malignant growths. In contrast, benign growths remain encapsulated and grow within well defined area. Although benign tumors may be fatal if untreated due o pressure on essential organs, as in the case of benign brain tumor, surgery or radiation are the preferred methods of treating growths which have a well defined location. Drug therapy is used when the tumor has spread ,or may spread ,to all areas of the body.
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  Modalities of treatment: 1-localtherapy: -surgery. -radiation therapy. 2-systemic treatment: chemotherapy. Hormonal therapy. 3-supportive care. 4-non-conventional therapy. :Surgery Surgery was the first modality used successfully in the treatment of cancer. It is the only curative therapy for many common solid tumors. The most important determinant of a successful surgical therapy are the absence of distant metastases and no local infiltration. Microscopic invasion of surrounding normal tissue will necessitate multiple frozen section. Resection or sampling of regional lymph node is usually indicated. Surgery may be used for palliation in patients for whom cure is not possible. Has significant role in cancer prevention.
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  E.g. familial polypus'scoli. Surgery for prevention: Patients with conditions that predispose them to certain cancers or with genetic traits Associated with cancer can have normal life span with prophylactic surgery. -colectomy . -oophorectomy. -thyroidectomy. Radiation therapy Radiation therapy: is a local modality used in the treatment of cancer . Success depend in the difference in the radio sensitivity between the tumor and normal tissue. It involves the administration of ionizing radiation in the form of x-ray or gamma rays to the tumor site. Method of delivery: External beam(teletherapy): energy x-rays beams generated by a machine that are directed at the tumor from outside the body Internal beam therapy (Brachytherapy) : involve placing a radioactive material directly inside or next to the tumor. Radiation therapy is planned and performed by a team of nurses , dosimetrists , physician and radiation oncologist. A course of radiation therapy is preceded by a simulation session in which low-energy beam are used to produce radiograghic images that indicate the exact beam location. Chemotherapy Systemic chemotherapy is the main treatment available for disseminated malignant diseases. Progress in chemotherapy resulted in cure for several tumors. Chemotherapy usually require multiple cycle.
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  lassification of cytotoxicdrug:C Cytotoxic agent can be roughly categorized based on their activity in relation to the cell cycle What is the difference between phase specific & phase non specific?….. Phase non-specific: The drugs generally have a linear dose-response curve( the drug administration ,the  the fraction of cell killed). Phase specific: Above a certain dosage level further increase in drug doesn’t result in more cell killing but you can play with duration of infusion. Complication of Chemotherapy: Every chemotherapeutic will have some deleterious side effect on normal tissue . phase nonspecific. phase specific cytotoxic drug
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  E.G; Myelosuppression,nausea &vomiting,Stomatitis,and alopecia are the most frequently observed side effects. Criteria used to describe response are: (complete remission)is the disappearance of all detectable malignantComplete response disease. :is decrease by more than 50% in the sum of the products of thePartial response perpendicular diameters of all measurable lesions. :no increase in size of any lesion nor the appearance of any new lesions.Stable disease ase by at least 25% in the sum of the products of the:means an increProgressive disease perpendicular diameters of measurable lesion or the appearance of new lesions. Endocrine therapy Many hormonal antitumor agents are functional agonist or antagonist of the steroid hormone family. Adrenocorticoids: Antiandrogen: Estrogen: Antiestrogen: Progestins Aromatase inhibitor: Gonadotropin-releasing hormone agonists: Somatostatin analogues: Adrenocorticosteroid: Are frequently used in combination regimen for the treatment of lymphocytic leukemia and lymphoma. They function by binding to glucocorticoid - specific receptors present in lymphoid cells and initiate programmed cell death They most commonly used agent are prednisone , methylprednisone , dexamethosone.
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  :Antiandrogens Flutamide : Effectively blocksthe binding of androgen to its receptor in the periphral tissue . It is used in the treatment of disseminated prostate ca Biological therapy Immunotherapy .