ANTI NEOPLASTIC DRUGS
Department of Pharmacology, JNTU University, Hyderabad, Telangana, India
- Corresponding Author:
- Mamatha M
Department of Pharmacology
Hyderabad, Telangana, India
Received: 16/01/2015; Accepted: 16/02/2015; Published: 21/02/2015
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Tumours, Cell proliferation, Growth, Alkylating agent, parenchyma
Anticancer drugs are the drugs that prevent or inhibit the maturation and proliferation of neoplasms. These are not only used in different types of cancers but also in conjunction with radiotherapy and immunotherapy in the combined modality approach for many solid tumors, especially metastatic. Generally the term cancer is used for all malignant tumors.
Anti- neoplastic drugs is defined as the growth or mass of abnormal tissue formed due to excessive autonomous and uncoordinated cell proliferation.
Origin of cancer
Generally in all the organs and tissues of human beings, a balance is maintained between cell and cell apoptosis (cell death program). There is a particular life span for all the mature old cells which die. And the new cells replace the old cells by proliferation and differenation mechanisms. This entire process is regulated such that the number of specific type of cells remains constant without altering the other process.
Occasionally, due to carcinogens (cancer causing agents) one of the cells gets mutated and does not respond to normal growth control mechanism. This mutated cell undergoes further mutation and transforms into tumor cell which starts proliferating vigorously.This interns results in a mass of abnormal cells called neoplasm or tumor.
Classification of Tumors Based on Origin and Composition
Tumors are classified into many types based on their composition and origin cells. Basically tumor consists of parenchymal cells and stromal cells.
Parenchyma is the function tumors. In which it alkylating agent. It is widely used to treat Hodgkin’s andcontain only parenchymal cells are called medullary carcinomas.
a) Epithelial cells Eg: Squamous epithelial cells, hepatic cells, Glandular cells
b) mesenchymal cells Eg: Adipocytes, Fibrocytes, Bones, Skeletal muscles
It is a connective tissue of a tumour.it functions as the frame work for the parenchyma. It supplies blood
Eg: breast cell carcinoma
They are tumours of more than one germinal layer. They may be benign or malignant.
Eg: Embryonic cells
Causes of cancer
Cancer is caused by changes (mutations) to the DNA within cells.
• Chemical carcinogens
• Lifestyle factors
• Immune system
• Your genetic make-up
Classification of Antineoplastic Agents / Anticancer Drugs
• Nitrogen mustards: Melphalan, Cyclophosphamide, Ifosfamide
• Methyl Hydrazines
• Platinum Coordination complexes: Cisplatin, Carboplatin, Oxaliplatin
Alkylating agents are the covalent DNA binding drugs. These are the class 1 chemotherapy drugs .It help to stop the tumor growth by cross linking guanine nucleobases in DNA double- helix strands directly attacking DNA. It makes the strand unable to coil or separate. Alkylating agents are also mutagenic and Carcinogenic.
Nitrogen Mustard: Cyclophosphamide
Trade names: Cytoxan®, Neosar®
Cyclophosphamide is an Alkylating agent. Cyclophosphamide is used to treat Hodgkin’s and non- Hodgkin’s lymphoma. Because of wide variety of cancer it treats it also has a wide variety of administration options. Route of administration is given orally as well as intravenously with efficacy. The major site of alkylation within DNA is the N7 position of guanine. These interactions can occur on a single strand or on both strands of DNA through cross-linking. High doses of cyclophosphamide given as chemotherapy of cancer or as myeloablative therapy in combination of total body irradiation or busulfan in preparation for hematopoietic cell transplantation can induce sinusoidal obstruction syndrome.
• The side effects of cyclophosphomide depend on how much of the drug is given.
• Low blood counts You’re white and red blood cells and platelets may temporarily decrease. This can put you at increased risk for infection, anemia and bleeding.
Hair loss, nausea, vomiting, Discoloration of the skin or nails
Uses of Alkylating agent
Alkylating agent are used in the treatment of a wide variety of hematologic and solid cancers, generally as part of a combination regimen
• Folate Antagonists: Methotrexate
• Purine antagonists
• Pyrimidine antagonists: 5-Fluorouracil, Cytarabibe
Antimetabolites drugs are the first effective chemotherapeutic agents. They are characterized by low molecular weights. Generally, antimetabolites induce cell death during the S phase of cell growth. Antimetabolites generally inhibit their synthesis or by competing with them in DNA or RNA synthesis.
Bone marrow suppression
GI mucosa Natural Products
a. Plant Products
• Vinca Alkaloids: Vincristine, Vinblastine
• Taxanes: Paclitaxel, Docetaxel
• Epipodophyllotoxins: Etoposide
• Camptothecins: Irinotecan
The vinca alkaloids, vin cristine and vinblastine, disorganize the mitotic spindle to arrest cell division. While these are characteristic effects of the vinca alkaloids, they prob ably act by another mechanism, since vincristine differs from vinblastine pharmacologically and therapeutically. Vincristine is more effective in acute leukemia and vinblastine in Hodgkin's disease than the other plant alkaloids, colchicine and its derivatives and podophyllotoxin, which also produce metaphase arrest.
Adverse effects: The main adverse effects that can develop is the syndrome of inappropriate secretion of antidiuretic hormone (SIADH).
•Antibiotics: Doxorubicin, Bleomycin
L-asparaginase acts in a unique manner to hydrolyse asparagine to aspartic acid, and neoplastic cells unable to make this amino acid, die if the supply of L-asparagine inthe circulating blood, on which they are dependent,is destroyed by the enzyme. Normal cells synthesize L-asparagine for their needs, and thus appear to be unaffected by the L-asparagine deficiency in the blood stream.
Adverse effects: The main side effect of this agent is a hypersensitivity reaction manifested by fever, chills, nausea and vomiting. Severe cases can present with bronchospasm, respiratory failure, and hypotension.
Miscellaneous drugs is an analog of urea whose mechanism of action involves the inhibition of DNA synthesis in the S phase by inhibiting the enzyme ribonucleotide reductase, resulting in depletion of deoxynucleoside triphosphate pools. Route of administration is mainly orally. It is mainly used for the treatment of chronic myelogenous leukemia and blast crisis of acute myeloid leukemia.
• Imatinib Mesylate
• Zoledronic Acid
Hormones and Antagonists
The relationship between hormones and hormone-dependent tumors was initially demonstrated in 1896 when Beatson showed that oophorectomy produced improvement in women with advanced breast cancer. Corticosteroids have been useful in the treatment of acute leukemia, lymphoma, multiple myeloma, and other hematologic malignancies as well as in advanced breast cancer.
• Corticosteroids: Prednisone, Dexamethasone
• Estrogens: Ethinyloestradiol
• Antiestrogens: Tamoxifen
• rogesteron derivative: Megestrol Acetate
• Androgen: Testosterone propionate
• Antiandrogen: Flutamide , Bicalutamide
• Aromatase inhibitor: Letrozole , Anastrazole
• 5-alpha reductase inhibitor: Finasteride
• GnRH Analogue: Leuprolide, Buserelin
• Growth Hormone, glucagon and insulin inhibitor: Octreotide
Attempt to Cure or Palliate Cancer Employs 3 Principal Methods
Differing from the radiotherapy and that emphasize on the treatment of local tissues, the chemotherapy is concerned with that of the whole body.
Operation: Cancer surgery or an operation is to repair or remove the part of the body to diagnose or treat cancer Surgery is the oldest type of cancer therapy and remains an effective treatment for many types of cancer today. It is often used to remove all the cancerous tissue. To diagnose cancer a surgeon may remove a small piece of muscle. This is called a biopsy. If the biopsy contains cancer cells, biopsy is a test where they will collect the tissue for the examination it show what type of cancer it is and how slowly or quickly it may grow. Mostly operations are done for the breast cancer, lung cancer, stomach cancer.
Breast cancer surgery is to remove the tumor and some of the surrounding healthy tissue.
Types of breast cancer surgery
• Lumpectomy: This type of cancer surgery removes only a part of the breast. Lumpectomy, also known as breast-conserving surgery, Even though the lumpectomy is the least invasive breast surgery, it can still be very effective.
• Partial or segmental mastectomy or quadrantectomy : Partial or segmental mastectomy or quadrantectomy cancer remove a larger portion of the breast than in the lumpectomy- perhaps a whole segment or quadrant of tissue- in order to eliminate the cancer.
• Simple or total mastectomy: Mastectomy is surgery to remove the entire breast.
• Radical mastectomy: A radical mastectomy removes the entire breast, underarm lymph nodes of the chest muscle.
• Modified radical mastectomy: Modified radical mastectomy is simple mastectomy and removal of axillary lymph nodes.
• Side effects for the breast cancer can cause short-term pain and tenderness in the treated area, surgery involving the lymph node can cause swelling in arm this type of condition is known as lymphedema.
Radiotherapy: Radiotherapy is the use of high energy x-rays to destroy cancer cells while reducing the impact on healthy cells. Radiotherapy is used to treat cancer in many sites of the body. Radiation therapy is synergistic with chemotherapy; it can also be used before or after the chemotherapy.
There are two types of radiation therapy
1. Internal radiation
2. External radiation
Side effects: skin problems, such as dryness, itching, blistering, or peeling.
Fatigue associated with cancer treatment is different from fatigue from lack of sleep
Chemotherapy is a cancer treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. The way the chemotherapy is given depends on the type and stage of the cancer being treated.
The main goal of anti-neoplastic drug is to eliminate the cancer cells without affecting normal tissues. Drug resistance is often associated with loss of p53 function, DNA mismatch repair system, and increased MDR1 gene expression.
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