Cancer and its treatment
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Cancer and its treatment

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  • Negative effects of immune system.quartz
  • E.g familial polyposis coli.
  • Surgical removal of colonRemoval of ovariesRemoval of thyroid gland
  • Chemotherapy is the treatment of cancer with one or more cyto toxic anti-nucleoplastic drugs .
  • Alkylating agent- they are so named because of their ability to alkylate many nucleophile functional groups under conditons present in cellAnit metabolites- they masccarade as pyrines or pyramidines which become the building blocks of DNA. They protect the subtstance from being incorporated into DNA during the s phase of cells.Plant Alkaloids- these alkaloids derived from plants and block cell division by preventing microtubule function.Microtubles are vital for cell to divide and without them cell division cannot occur.Immuno therapy- it is a medical term defined as a treatment of disease by enchancing or suppressing immune response.Immunotheraphy is designed to illicit or amplify an immune response are classified as active immune therapyWhile those suppress are called suppression immunotherapy .
  • Stomatitis- is inflammation of the mucous lining of any of the structures in the mouth. Which may involve the cheeks, gums, tongue, lips, throat, and just afte the mouthAlopecia- means loss of hait from head or body . Causes baldness.

Cancer and its treatment Cancer and its treatment Presentation Transcript

  • CANCER▪ As per cancer research U.K it is a terrifying disease where ‘ Cells growout of control and invade , erode and destroy normal cells.▪ Cancer develops because of a complicated interaction between ourgenes, the environment and chance.
  • CAUSE OF CANCER▪ As genes switch on and off, they determine when and how fast the cell will growand divide, when it will stop dividing, and even when it will die▪ Cancer can result when controls over cell division are lost.▪ It is initiated by :1. Chemicals- like alcohol and tobacco.2. Diet and exercise- excessive diet, obesity and inactivity.3. Infection – Viruses like oncovirus, bacteria and parasites.4. Radiation- Ionizing radiations from medical imaging and radon gases and non-ionizingultraviolet radiation.5. Heredity- Inherited genetic defect6. Physical agents- glass wool, powdered cobalt, nickel and crystallite silica.7. Hormones- growth hormones promote cancer through cell proliferation.
  • CANCER SCENARIO IN INDIA
  • SOME TUMORS ARE CANCER, OTHERSARE NOTCells in a tissue overgrowResulting defined mass: tumorBenign, e.g., molesSlow growthExpands in the same tissue; does not spreadCells look nearly normalMalignantRapid growthInvades surrounding tissue and metastasizesCell differentiation usually poor
  • CANCER CELLS ARE ABNORMAL IN THEIRGROWTH AND APPEARANCE- FALSE FEET ISCOMMON FEATURE
  • ▪ Initiation -important change introduced into cell▪ Probably through DNA alteration▪ More than one event probably needed for tumor production.▪ Reversible unless and until treated.▪ Promotion -biochemical event encourages tumorFormation and growth.▪ Genetically need both initiation and promotion▪ Initiators, promoters may be toxins OR radiation OR viruses)STEPS TO CANCER
  • CANCER IS A GENETIC DISEASE▪ Cancer is a genetic disease that develops in a predictablesequence of steps Carcinogenesis• Transformation of a normal cell into a cancerous cell• Step-by-step transformation
  • SOME MAJOR TYPES OF CANCER▪ In general, a cancer is named according to the type of tissuein which it first forms Sarcomas: cancer of connective tissue Carcinomas: cancer arising from epithelium Lymphomas: cancer of lymphoid tissue Leukemia: cancer of blood Gliomas: cancer of brain glial cells
  • MODALITIES OF TREATMENT:▪ local therapy:▪ -surgery.▪ -radiation therapy.▪ systemic treatment:▪ chemotherapy.▪ Hormonal therapy.▪ Monoclonal antibodies.▪ Radioactive material.
  • 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 ofdistant metastases and no local infiltration.
  • CONT:▪ Microscopic invasion of surrounding normal tissue willnecessitate multiple frozen section.▪ Resection or sampling of regional lymph node is usuallydone.▪ Surgery may be used for palliation in patients for whomcure is not possible.▪ Has significant role in cancer prevention.
  • SURGERY FOR PREVENTION:▪ Patients with conditions that predispose them to certain cancers or with genetictraits associated with cancer can have normal life span with prophylactic surgery.-colectomy .-oophorectomy.-thyroidectomy.-removal of premalignant skin lesion .
  • RADIATION THERAPY:
  • 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 andnormal tissue.▪ It involves the administration of ionizing radiation in the form of x-ray or gammarays to the tumor site.▪ Method of delivery: External beam Radiotherapy(teletherapy).Internal beam therapy(Brachytherapy).Permanent brachytherapy is often performed for prostate cancer using "seeds" -small radioactive rods implanted directly into the tumor.
  • CONT:▪ 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 beamlocation.
  • CONT:▪ Radiation therapy is usually delivered in fractionated dosessuch as 180 to 300 cGy per day,five times a week for a totalcourse of 5-8 weeks.▪ Radiation therapy with curative intent is the main treatmentin limited stage Hodgkin’s disease. Also can use in palliative&emergency setting.
  • COMPLICATION OF RADIATION:▪ There is two types of toxicity ,acute and long term toxicity.▪ Systemic symptoms such as Fatigue,local skin reaction,GItoxicity.▪ Long-term effect may occur many months or years afterradiation therapy.▪ Radiation therapy is known to be mutagenic,carcinogenic,and teratogen,and having increased risk ofdeveloping both secondary leukemia and solid tumor.
  • NUCLEAR MEDICINE
  • RADIONUCLIDES:▪ For decades have been used systemically to treat malignantdisorders.▪ They are administer by specialists in nuclear medicine orradiation oncologist.▪ Radioactive iodine:in the from of 131I is effective therapy forwell differentiated thyroid ca▪ Strontium-89. Is used for the treatment of bodymetastasis.it is an alkaline earth element in the same familyas calcium
  • CHEMOTHERAPY:
  • CHEMOTHERAPY:▪ Systemic chemotherapy is the main treatment available for disseminated malignantdiseases.▪ Progress in chemotherapy resulted in cure for several tumors.▪ Chemotherapy usually require multiple cycles.
  • CLASSIFICATION OF CYTOTOXIC DRUG:▪ Cytotoxic agent can be roughly categorized based on their activity in relation to thecell cycle.phase nonspecific. phase specificcytotoxic drug
  • CONT :▪ What is the difference between phase specific & phase nonspecific?…..▪ Phase non-specific:▪ The drugs generally have a linear dose-response curvePhase specific:▪ Above a certain dosage level,further increase in drugdoesn’t result in more cell killing.but you can play withduration of infusion.
  • WHAT ARE THECHEMOTHERAPEUTICAGENT?…..
  • CHEMOTHERAPEUTIC AGENTS:▪ Alkylating agents:▪ Antimetabolites:▪ Antitumor antibiotic:▪ Plant alkaloids:▪ Hormonal agent:▪ Immunotherapy:
  • COMPLICATION OF CHEMOTHERAPY:▪ Every chemotherapeutic will have some deleterious side effect on normal tissue .▪ E.G; Myelosuppression,nausea&vomiting,Stomatitis,and alopecia are the most frequently observed side effects.
  • CRITERIA USED TO DESCRIBERESPONSE ARE:▪ Complete response (complete remission)is thedisappearance of all detectable malignant disease.▪ Partial response :is decrease by more than 50% in the sumof the products of the perpendicular diameters of allmeasurable lesions.▪ Stable disease :no increase in size of any lesion nor theappearance of any new lesions.▪ Progressive disease :means an increase by at least 25% inthe sum of the products of the perpendicular diameters ofmeasurable lesion or the appearance of new lesions.