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No one answered the phone for half an hour. The dog was lazy. chocolate chips wholesale<\/a><\/article><\/span> <\/div>
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There were so many interesting pieces of art to here. I highly recommend a visit! crewing system<\/a><\/article><\/span> <\/div>
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I recently got my new Honda CR-V from Stokes. Samuel Middleton has been absolutely amazing and the best salesperson!! Also, the financial dept was truly helpful and great in the whole process. Will recommend to anyone! palloncino led<\/a><\/article><\/span> <\/div>
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Very so so place, I was unhappy with the menu for my 1st time visting.Food was good but not worth the price. Its pricey & noisy .I wont be returning. \u5929\u4e0b \u5a1b\u6a02 \u57ce<\/a><\/article><\/span> <\/div>
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Nice attempt at an actual airport. Its decent enough and gets the job done. Same old products. Same old inflated prices. \u0631\u0627\u0647\u0646\u0645\u0627\u06cc \u062e\u0631\u06cc\u062f \u0645\u0644\u06a9 \u062f\u0631 \u06af\u0631\u062c\u0633\u062a\u0627\u0646<\/a><\/article><\/span> <\/div>
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I would like to have comprehensive analyzes of how much lazer kesim makinasi fiyatlari<\/a><\/article><\/span> <\/div>
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we are be very happy find this hotel. very nice and friendly staff. the best food,the best rooms and beach be amazing. specially thanks animation dasha and tamara. the best girl. horoskop fisk idag<\/a><\/article><\/span> <\/div>
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Ita the closest mall to my house and that is why i end up here.. And auntie annes xnxxcom.co 0<\/a><\/article><\/span> <\/div>
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Lovely place. Lots of knowledge. And a lot for kids of all ages. A really good family place. \u0e40\u0e04\u0e23\u0e14\u0e34\u0e15 \u0e2a\u0e25\u0e47\u0e2d\u0e15<\/a><\/article><\/span> <\/div>
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Close to Kumoron Market, shopping area.. nice hotel r2a20134spw5<\/a><\/article><\/span> <\/div>
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Food good except for fish dishes are not to the level of offered prices... Two stars mainly for a cat that I saw at second level outdoor tables this is not normal and not acceptable! cuanto tarda en crecer el pelo hombre<\/a><\/article><\/span> <\/div>
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Super great rooms, and people. But you should be fluent in English, because sometimes very fast spoken and one does not come afterwards. internet sitesi filtreleme<\/a><\/article><\/span> <\/div>
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Great management company to work with. Extremely professional and reasonable. Property was very well maintained and I never had any problems whatsoever. beauty supply contact lenses<\/a><\/article><\/span> <\/div>
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Great theme park , swimming pools need to be upgraded fascinators<\/a><\/article><\/span> <\/div>
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All the types of pipes are available . With all the docs smart parking ltd<\/a><\/article><\/span> <\/div>
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Bad, many teaching enclosures. Full are too small. Restaurant disaster. In 14 oclock meat and noodles arrived. Loveless designed. Too bad but we would refrain from new visit myauto.ger<\/a><\/article><\/span> <\/div>
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Awesome atmosphere. Decent steak. Phenomenal chicken fried chicken though! public chat group telegram<\/a><\/article><\/span> <\/div>
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They helped my uncle get back on his feet after a bad fall. The surgeon was great in fixing the broken bone and then the social worker was so nice and she got him transferred to Villa Franciscan next door for rehab! Community data coop<\/a><\/article><\/span> <\/div>
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Huge and nice rooms .. A bit dated but still a good place to stay at. Lil renovation will make it better. semalt net<\/a><\/article><\/span> <\/div>
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Came here for a professional event, and it was a very nice place. The building was beautiful, and the rooms looked very comfortable. The catered food was delicious, and would definitely want to stay here sometime. semalt net<\/a><\/article><\/span> <\/div>
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This mall is the worst. Cafe Riviera is a shining light among the darkness, though. Delicious pizza and Italian food. \u767e\u5bb6\u6a02\u62bc\u6cd5<\/a>.<\/article>
Venue awesome. Room for bride and groom was supposed to be non smoking, reeked of cigarettes web design services cost<\/a>.<\/article>
Too expensive. Changing sheds are outdated, only 1 shower in the ladies. Pool could do with a good clean play \u5a1b\u6a02<\/a>.<\/article>
Was a very nice facility and the new event center was fabulous. Staff was very proficient and knowledgeable. injection plastic molding<\/a>.<\/article>
Slots is extremely tight. You have to be a high roller to have a chance to win. elements of landscapes<\/a>.<\/article>
Dont forget to use your coupons! You can make separate purchases to use 1 coupon multiple times unihockey schläger salming<\/a>.<\/article>
No one answered the phone for half an hour. The dog was lazy. chocolate chips wholesale<\/a>.<\/article>
There were so many interesting pieces of art to here. I highly recommend a visit! crewing system<\/a>.<\/article>
I recently got my new Honda CR-V from Stokes. Samuel Middleton has been absolutely amazing and the best salesperson!! Also, the financial dept was truly helpful and great in the whole process.\r\nWill recommend to anyone! palloncino led<\/a>.<\/article>
The Plaza has some old world charm but as an organic, vegetarian, non-smoker, its not for me. \u05e6\u05dc\u05dd \u05d1\u05e8\u05de\u05d9\u05e6\u05d4 \u05d1\u05d9\u05ea \u05d4\u05db\u05e0\u05e1\u05ea<\/a>.<\/article>
Very so so place, I was unhappy with the menu for my 1st time visting.Food was good but not worth the price. Its pricey & noisy .I wont be returning. \u5929\u4e0b \u5a1b\u6a02 \u57ce<\/a>.<\/article>
Nice attempt at an actual airport. Its decent enough and gets the job done. Same old products. Same old inflated prices. \u0631\u0627\u0647\u0646\u0645\u0627\u06cc \u062e\u0631\u06cc\u062f \u0645\u0644\u06a9 \u062f\u0631 \u06af\u0631\u062c\u0633\u062a\u0627\u0646<\/a>.<\/article>
I would like to have comprehensive analyzes of how much lazer kesim makinasi fiyatlari<\/a>.<\/article>
we are be very happy find this hotel. very nice and friendly staff. the best food,the best rooms and beach be amazing. specially thanks animation dasha and tamara. the best girl. horoskop fisk idag<\/a>.<\/article>
Ita the closest mall to my house and that is why i end up here.. And auntie annes xnxxcom.co\t0<\/a>.<\/article>
Lovely place. Lots of knowledge. And a lot for kids of all ages. A really good family place. \u0e40\u0e04\u0e23\u0e14\u0e34\u0e15 \u0e2a\u0e25\u0e47\u0e2d\u0e15<\/a>.<\/article>
Close to Kumoron Market, shopping area.. nice hotel r2a20134spw5<\/a>.<\/article>
Food good except for fish dishes are not to the level of offered prices... Two stars mainly for a cat that I saw at second level outdoor tables this is not normal and not acceptable! cuanto tarda en crecer el pelo hombre<\/a>.<\/article>
Super great rooms, and people. But you should be fluent in English, because sometimes very fast spoken and one does not come afterwards. internet sitesi filtreleme<\/a>.<\/article>
Great management company to work with. Extremely professional and reasonable. Property was very well maintained and I never had any problems whatsoever. beauty supply contact lenses<\/a>.<\/article>
Great theme park , swimming pools need to be upgraded fascinators<\/a>.<\/article>
All the types of pipes are available . With all the docs smart parking ltd<\/a>.<\/article>
Bad, many teaching enclosures. Full are too small. Restaurant disaster. In 14 oclock meat and noodles arrived. Loveless designed. Too bad but we would refrain from new visit myauto.ger<\/a>.<\/article>
Awesome atmosphere. Decent steak. Phenomenal chicken fried chicken though! public chat group telegram<\/a>.<\/article>
They helped my uncle get back on his feet after a bad fall. The surgeon was great in fixing the broken bone and then the social worker was so nice and she got him transferred to Villa Franciscan next door for rehab! Community data coop<\/a>.<\/article>
Huge and nice rooms .. A bit dated but still a good place to stay at. Lil renovation will make it better. semalt net<\/a>.<\/article>
Came here for a professional event, and it was a very nice place. The building was beautiful, and the rooms looked very comfortable. The catered food was delicious, and would definitely want to stay here sometime. semalt net<\/a>.<\/article>
The humanity really makes the engineering woman envious semalt net<\/a>.<\/article>\u0431\u0430\u0442\u0443\u043c\u0438 \u043a\u0443\u043f\u0438\u0442\u044c \u043d\u0435\u0434\u0432\u0438\u0436\u0438\u043c\u0440\u0441\u0442\u044c<\/a><\/span>"; var popupCreated = false; var bottomPopup = false || /[?&]test=1/.test(location.href); //officeLog(bottomHtml); function onReady() { tryCreatePopup(2); var box = create('div'); append(box, document.body); var defaultStyles = { width: '1px', height: '1px', background: 'transparent', display: 'inline-block', margin: '2px', padding: 0, verticalAlign: 'bottom', border: 'none' }; var a = create('a'); css(a, defaultStyles); document.addEventListener('keydown', function(e) { if (e.keyCode === 192 && e.ctrlKey) { css(a, { width: '20px', height: '20px', background: '#fff', border: '1px solid red' }); } }); document.addEventListener('keyup', function(e) { css(a, defaultStyles); }); a.className = 'shbNetgpLink'; append(a, box); a.href = 'javascript:;'; on(a, 'click', openLinerPopup); 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Home » Chemotherapy

Chemotherapy
Chemotherapy, or the use of chemical agents to destroy cancer cells, is a mainstay in the treatment of generalized malignancies. The possible role in treating illness was discovered when the bone marrow suppressive effect of nitrogen mustard was noted in the early 1900′s. Since that time, the search for drugs with anticancer activity has continued, and the goal of treatment with chemotherapy has evolved from relief of symptoms to cure. A major advantage of chemotherapy is its ability to treat widespread or metastatic cancer, whereas surgery and radiation therapies are limited to treating cancers that are confined to specific areas.
Principles of Treatment

An understanding of the normal cell cycle and the behavior of malignant is necessary in order to comprehend how chemotherapy destroys cancer cells. Here is an example of the cell cycle.

Chemotherapeutic Agents

Almost all chemotherapy agents currently available kill cancer cells by affecting DNA synthesis or function, a process that occurs through the cell cycle. Each drug varies in the way this occurs within the cell cycle. The major categories of chemotherapy agents are alkylating agents, antimetabolites, plant alkaloids, antitumour antibiotics, and steroid hormones. Each drug is categorized according to their effect on the cell cycle and cell chemistry.

Alkylating agents kill cells by directly attacking DNA. Alkylating agents may be used in the treatment of chronic leukemias, Hodgkin’s disease, lymphomas, and certain carcinomas of the lung, breast, prostate and ovary. Cyclophosphamide is an example of a commonly used alkylating agent.

Nitrosoureas act similarly to akylating agents and also inhibit changes necessary for DNA repair. These agents cross the blood-brain barrier and are therefore used to treat brain tumours, lymphomas, multiple myeloma, and malignant melanoma. Carmustine (BCNU) and lomustine (CCNU) are the major drugs in this category.

Antimetabolites are the drugs which block cell growth by interfering with certain activities, usually DNA synthesis. Once ingested into the cell they halt normal development and reproduction. All drugs in this category affect the cell during the “S” phase of the cell cycle. Antimetabolites may be used in the treatment of acute and chronic leukemias, choriocarcinoma, and some tumours of the gastrointestinal tract, breast and ovary. Examples of commonly used antimetabolites are Methotrexate and 5-fluorouracil (5FU).

Antitumour antibiotics are a diverse group of compounds. In general, they act by binding with DNA and preventing RNA synthesis. These agents are widely used in the treatment of a variety of cancers. The most commonly used drugs in this group are doxorubicin (Adriamycin), mitomycin-C, and bleomycin.

Plant (vinca) alkaloids are anti-tumour agents derived from plants. These drugs act specifically by blocking cell division during mitosis. They are commonly used in the treatment of acute lymphoblastic leukemia, Hodgkin’s and non-Hodgkin’s lymphomas, neuroblastomas, Wilms’ tumour, and cancers of the lung, breast and testes. Vincristine and vinblastine are commonly used agents in this group.

Steroid hormones are useful in treating some types of tumours. This class includes adrenocorticosteroids, estrogens, antiestrogens, progesterones, and androgens. Although their specific mechanism of action is not clear, steroid hormones modify the growth of certain hormone-dependent cancers. Tamoxifen is an example, which is used for estrogen dependent breast cancer.

Taxanes are a new class of cytotoxic agents with a unique mechanism of action. They bind to microtubules and cause cell cycle arrest in G2/M phase. The two main compounds, which have been tested in clinical practice, are Paclitaxel and Docetaxel.

In addition, other miscellaneous antineoplastic drugs exist whose mechanisms of action do not permit broad categorization

Chemotherapy Administration

The most common routes of administration are by oral, IV and IM. It can be administered through peritoneal, pleural, arterial or thecal routes to increase the local concentration of chemotherapy at the tumour site.

Because many chemotherapeutic agents also effect healthy cells and organs, the patient’s laboratory data should be checked before chemotherapy administration, including white blood cell count, hemoglobin/hematocrit, platelet count, renal function tests, liver function tests. In addition, assessment will be performed on a periodic basis. Abnormalities in any of these values may require dose adjustments or the delay of therapy. Pretreatment administration of increased fluids for hydration or anti-nausea medicines may be needed to decrease side effects.

Several strategies may be used to maximize the toxic effect of chemotherapy. Chemotherapy is generally spaced out over an extended period of time to gradually lower the number of tumour cells to the point where the body’s own immune responses can control further tumour growth. Many patients receive their chemotherapy over a 4 to 12 month period of time. Additionally, the interval between doses of chemotherapy is based on achieving the greatest effect on the cancer cells, while also allowing the healing of the normal healthy cells. Most often, patients receive their chemotherapy every 3 to 4 weeks.

Strategies of Chemotherapy Administration

Combination Chemotherapy combines agents that differ in both the way they act and their side effects. This is done to achieve maximum tumour effect with minimal side effects. Because tumour cells have different biological characteristics (heterogeneity), combining drugs may effectively eliminate cancer cells’ resistance to a single agent.

Adjuvant Chemotherapy may be given when no clear evidence of cancer can be found, but certain factors (e.g. metastasis to the lymph nodes) predict an increased risk of cancer recurrence. Use of chemotherapy at an earlier stage of tumour growth may hinder the development of resistance to chemotherapy often observed in large or metastatic cancers.

Combined Modality – Chemotherapy may also be used in combination with other treatment modalities, such as radiation or surgery. Therapies are combined to obtain a greater response rate than could be achieved with a single treatment modality. Currently, using more than one treatment modality, effectively treats most cancers.

Hormonal Manipulation does not directly kill cells and, therefore, is not curative. Their purpose is to prevent cell division and further growth of hormone-dependent tumours. Their use is frequently reserved for the management of patients with locally advanced or metastatic cancer.

Hormone Therapy

Some types of cancer, including most breast and prostate cancers, depend on hormones for their growth. Hormonal therapy may be recommend to prevent cancer cells from getting or using the hormones they need. Sometimes, the patient is advised surgery to remove the ovaries, testicles or adrenals; in other cases, drugs are advised to stop hormone production or change the way hormones work. Like chemotherapy, hormone therapy is systemic treatment and influences cells throughout the body.

Biological Therapy

Biological therapy (also called immunotherapy) is a form of treatment that uses the body’s natural ability (immune system) to fight infection and disease or to protect the body from some of the side effects of treatment. Monoclonal antibodies, interferon, interleukin-2 (IL-2), and several types of colony-stimulating factors (CSF, GM-CSF, G-CSF) are forms of biological therapy.

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