compendium review - genetics 18&19

8/14/2019 Compendium Review - Genetics 18&19

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Compendium ReviewCompendium ReviewMajor Topic Three: GeneticsMajor Topic Three: Genetics

Part 1Part 1 Chromosomes and Cell CycleChromosomes and Cell Cycle MitosisMitosis MeiosisMeiosis Mitosis and Meiosis ComparisonMitosis and Meiosis Comparison Chromosome InheritanceChromosome Inheritance

Part 2Part 2 Cancer CellsCancer Cells Cancer: Causes and PreventionCancer: Causes and Prevention Cancer DiagnosisCancer Diagnosis

Cancer TreatmentCancer Treatment

Table of Contents


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Part 1Part 1 Chromosomes and Cell CycleChromosomes and Cell Cycle MitosisMitosis MeiosisMeiosis Mitosis and Meiosis ComparisonMitosis and Meiosis Comparison Chromosome InheritanceChromosome Inheritance


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Chromosomes and Cell CycleChromosomes and Cel

l CycleHumans have 46 chromosomes (23 pairs). Twenty-two pairs are identified as

autosomes, meaning they are all chromosomes except the sex

chromosomes. The sex chromosomes are known as XY (male) and XX(female). These chromosomes account for the other pairs.

Any cell with a nucleus can be examined to see a persons chromosomes. Acomputer aids in the arrangement of chromosomes; the display is known as

KARYOTYPE. Every body cell contains all 46 chromosomes. This is because of

a type of cell division known as MITOSIS.

Each pair of chromosomes appears to be pinched, or held together, by aCENTROMERE . In dividing cells, a pair of chromosomes has SISTER CHROMATIDS ,

46 chromosomes of male

Pictures fromHuman Biologyby Sylvia S.Mader page378

Male sexchromosomes XY


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romosomes an e yc eContinuedContinuedCELL CYCLE:CELL CYCLE: Interphase, mi

tosis, and cytokinesis are the three stages of aInterphase, mitosis, and cytokinesis are the three stages of acell cycle.cell cycle.

INTERPHASE:INTERPHASE: DNA synthesisDNA synthesisand cell growth occur. Thisand cell growth occur. Thispart of the cell cycle is thepart of the cell cycle is thelongest and is broken uplongest and is broken upinto three stages.into three stages.

1. G1 Stage:1. G1 Stage: OrganellesOrganelles

double, material collecteddouble, material collectedfor DNA replication andfor DNA replication andchromatin conversion.chromatin conversion.

2. S Stage:2. S Stage: DNA replicatesDNA replicatesproducing duplicatedproducing duplicated

chromosomes.chromosomes.3. G2 Stage:3. G2 Stage: proteins areproteins are

synthesized in preparationsynthesized in preparationfor cell division.for cell division.

CELL DIVISION:CELL DIVISION: After the interphaseAfter the interphasestage is complete, the cell will enterstage is complete, the cell will enterthe division stage which consists of Mthe division stage which consists of M(mitotic) and cytokinesis.(mitotic) and cytokinesis.

MITOSIS:MITOSIS: A type of cell division whereA type of cell division whereall new nucleus contain a duplicatedall new nucleus contain a duplicated

copy as that of its parent cell. It willcopy as that of its parent cell. It willhave the same number and kind of have the same number and kind of chromosomes.chromosomes.

CYTOKINESIS:CYTOKINESIS: Cytoplasm divisionCytoplasm divisionoccurring after mitosis.occurring after mitosis.

Picture from Human Biology by Sylvia S. Mader page

Picture showsCell Cycle

Process


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Chromosomes and Cell CycleChromosomes and Cell Cycle MitosisMitosis MeiosisMeiosis Mitosis and Meiosis ComparisonMitosis and Meiosis Comparison Chromosome InheritanceChromosome Inheritance


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Phases of Mitosis:Phases of Mitosis: There are four phases of mitosis There are four phases of mitosis2. Metaphase:2. Metaphase: Breakage of Breakage of

nuclear envelope. Spindle fibersnuclear envelope. Spindle fibersmigrate to area of where nucleusmigrate to area of where nucleuswas and chromosomes center inwas and chromosomes center in

the middle.the middle.3. Anaphase:3. Anaphase:

Centromeres divide, theCentromeres divide, thechromatids splitchromatids split

becoming daughterbecoming daughterchromosomes andchromosomes and

move away from eachmove away from eachother. Theother. The

chromosomes movechromosomes movetowards each pole totowards each pole to

ensure each daughterensure each daughtercell will have the samecell will have the same

number and kind of number and kind of chromosomes as thechromosomes as theparent cell.parent cell.

1. Prophase:1. Prophase: Centrosomes duplicate outsideCentrosomes duplicate outsidenucleus and move to opposite ends. Spindlenucleus and move to opposite ends. Spindle

fibers appear in between the separated area,fibers appear in between the separated area,envelope starts to break and the nucleolusenvelope starts to break and the nucleolus

(responsible for ribosomal subunit production)(responsible for ribosomal subunit production)disappears. Chromosomes are visible;disappears. Chromosomes are visible;

positioned in nucleus.positioned in nucleus.

4. Telophase:4. Telophase: NucleoliNucleoliand nuclear envelopesand nuclear envelopesreappear as daughterreappear as daughtercells are developing.cells are developing.

While theWhile thechromosomes are atchromosomes are at

the poles they start tothe poles they start tobecome indistinctbecome indistinct

chromatin.chromatin.

----> EarlyMetaphase

Early Prophase toProphase

Metaphase

----> Anaphase ----> Telophase

Pictures from Human Biology by Sylvia S. Mader Pages 382-83


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Mitosis ContinuedMitosis ContinuedCYTOKINESIS:CYTOKINESIS: Cytoplasm andCytoplasm andorganelle division.organelle division. CLEAVAGECLEAVAGE

FURROWFURROW , indentation between cell, indentation between cellbefore it splits, occurs y pinchingbefore it splits, occurs y pinchingthe cell into two. Both cells havethe cell into two. Both cells havetheir own plasma membrane.their own plasma membrane.

Cleavage Furrow

Pictures from Human Biologyby Sylvia S. Mader Pages383-84

The cell cycle will The cell cycle willproduce cells to anproduce cells to anextent; however, if theextent; however, if thecell cycle system doescell cycle system doesnot function correctly itnot function correctly it

can create a benign orcan create a benign orcancerous tumor. Thecancerous tumor. Thecell cycle responds tocell cycle responds tohormones, growthhormones, growthfactors, and repairsfactors, and repairswounds. The side picturewounds. The side pictureshows how the cell cycleshows how the cell cycle


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Meiosis:Meiosis: Part of sexual reproductionPart of sexual reproductionChromosomes which look the same and carry the same genes are called

HOMOLOGOUS CHROMOSOMES . During the meiosis process, there are two divisionphases: meiosis I and meiosis II/fertilization. Meiosis is an important function in sexual

reproduction because it ensures diversity in changing environments.

MEIOSIS I:MEIOSIS I: The homologous pairs The homologous pairsarrange together, known asarrange together, known as

SYNAPSIS. After synapsis occursSYNAPSIS. After synapsis occursthey separate into sisterthey separate into sister

chromatids.chromatids.

MEIOSIS II/FERTILIZAYION:Centromeres divide, sister

chromatids separate. Result isdaughter chromosomes. Oncethe daughter cells mature theybecome GAMETES , or sex cells. They then combine during a

process known asFERTILIZATION . The ZYGOTE isthe first cell in a new being and

has all of the number of Picture from Human Biology by Sylvia S. Mader page

INTERKINESIINTERKINESISS is the timeis the timebetween thebetween thetwo periods.two periods.


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Meiosis ContinuedMeiosis Continued Meiosis is broken down into two stages: Prophase I and MetaphaseMeiosis is broken down into two stages: Prophase I and Metaphase

I.I.PROPHASE I:PROPHASE I: Synapsis takes place,Synapsis takes place,spindle emerge, breakage of nuclearspindle emerge, breakage of nuclearenvelope, nucleolus disappears. Aenvelope, nucleolus disappears. Aprocess known asprocess known as CROSSING-OVERCROSSING-OVER takes place where nonsistertakes place where nonsisterchromatids split apart and then fusechromatids split apart and then fusewith the other chromatids to formwith the other chromatids to formchromosomes with mixed genes.chromosomes with mixed genes.

METAPHASE I:METAPHASE I: Pairs align atPairs align atequator and maternal or parentalequator and maternal or parentalmembers can be ordered in amembers can be ordered in anumber of different combinations.number of different combinations.

Picture from Human Biologyby Sylvia S. Mader page 386

Pictures illustrates differentpairings during Metaphase I

Crossing-over of chromatids


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Chromosomes and Cell CycleChromosomes and Cell Cycle MitosisMitosis

MeiosisMeiosis Mitosis and MeiosisMitosis and Meiosis

ComparisonComparison Chromosome InheritanceChromosome Inheritance


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Mitosis and Meiosis ComparisonMitosis and Meiosis Com parisonMITOSISMITOSIS

One nuclear divisionOne nuclear division

Two daughter cells after Two daughter cells aftercytokinesiscytokinesis

Cells are diploid; sameCells are diploid; samechromosome number as parentchromosome number as parentcellcell

Genetically identical daughterGenetically identical daughtercells (of each other and parentcells (of each other and parentcell)cell)

Takes place during growth/repair Takes place during growth/repairof all tissues constantlyof all tissues constantly

During metaphase the individualDuring metaphase the individualchromosomes arrange in a line atchromosomes arrange in a line atequator (contain 2 chromatids)equator (contain 2 chromatids)

Sister chromatids becomeSister chromatids become

chromosomes after breakingchromosomes after breakingaway from centromeres; migrateaway from centromeres; migrate

MEIOSISMEIOSIS

Two nuclear division Two nuclear division

Four daughter cells after cytokinesisFour daughter cells after cytokinesis

Cells are haploid; half theCells are haploid; half thechromosome number of parent cellchromosome number of parent cell

Not genetically identical daughterNot genetically identical daughter

cells (of each other or parent cell)cells (of each other or parent cell) Takes place in reproductive organs Takes place in reproductive organsduring reproducing time periodsduring reproducing time periods

Like kind chromosomes pairLike kind chromosomes pairtogether and undergo crossing-overtogether and undergo crossing-over

During metaphase I homologousDuring metaphase I homologouschromosomes arrange in a line atchromosomes arrange in a line atequator (contain 4 chromatids)equator (contain 4 chromatids)

Homologous chromosomes split andHomologous chromosomes split andmigrate away to opposite polesmigrate away to opposite poles


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Spermatogenesis & OogenesisSpermatogenesis & OogenesisSPERMATOGENESIS:SPERMATOGENESIS: Sperm productionSperm production

400 million sperm produced a day in the400 million sperm produced a day in the

testes.testes. Primary Spermatocytes: Diploid (2n)Primary Spermatocytes: Diploid (2n)

Secondary Spermatocytes: Haploid (n) TwoSecondary Spermatocytes: Haploid (n) Twochromatidschromatids

Spermatids: Two haploids split to four haploidSpermatids: Two haploids split to four haploid

(n) One chromatid each, eventually become(n) One chromatid each, eventually becomesperm with 23 chromosomes eachsperm with 23 chromosomes each

OOGENESIS:OOGENESIS: Egg productionEgg production

Ovaries possess immature follicles; each follicleOvaries possess immature follicles; each folliclepossess primary oocytepossess primary oocyte

Primary Oocyte: Diploid (2n) splits during meiosis I toPrimary Oocyte: Diploid (2n) splits during meiosis I tohaploidhaploid

Secondary Oocyte: Duplicated chromosomes, oneSecondary Oocyte: Duplicated chromosomes, onereceives majority of cytoplasm while the other becomesreceives majority of cytoplasm while the other becomesthe first polar body containing copied chromosomes.the first polar body containing copied chromosomes.

Begins meiosis II. Leaves ovary, enters oviduct, fertilizedBegins meiosis II. Leaves ovary, enters oviduct, fertilizedand completes Meiosis II. Egg has 23 chromosomes.and completes Meiosis II. Egg has 23 chromosomes.

Picture fromHumanBiology bySylvia S.

Mader Page392

Spermatogenesis

Oogenesis


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Chromosomes and Cell CycleChromosomes and Cell Cycle MitosisMitosis

MeiosisMeiosis Mitosis and Meiosis ComparisonMitosis and Meiosis Comparison Chromosome InheritanceChromosome Inheritance


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Chromosome InheritanceChromosome InheritanceChanges in Chromosome NumbersChanges in Chromosome Numbers

If both homologous chromosome pair enterIf both homologous chromosome pair enterthe same daughter cell during meiosis I, or if the same daughter cell during meiosis I, or if sister chromatids dont separate duringsister chromatids dont separate duringmeiosis II, this is known asmeiosis II, this is known as NONDISJUNCTIONNONDISJUNCTION which results in too many or too fewwhich results in too many or too fewchromosomes.chromosomes. TRISOMY: 24 chromosome fertilized egg

MONOSOMY: 22 chromosome fertilized egg

BARR BODY: One X chromosome in femalebecomes darkly stained and inactive (TurnerSyndrome XO; do not undergo puberty,menstruation, or breast development)

During meiosis II, Jacobs syndrome occurs due tonondisjunction of spermatogenesis

Trisomy 21, known as down syndrome, is caused byan egg having two copies of chromosome 21,leading to a total of three copies

Klinefelter Syndrome (XXY) occurs in males and canproduce speech/language problems. May require

Picture from Human Biology by Sylvia S. Mader Page

Ch i Ch N b

N


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Changes in Chromosome Numbersa nges n romosome Num ersContinuedContinued

PLOY-X FEMALES:PLOY-X FEMALES: Three/four X chromosomes, extra Barr bodies. May produce Three/four X chromosomes, extra Barr bodies. May producemotor/language problems. Usually have normal menstruation and fertility.motor/language problems. Usually have normal menstruation and fertility.

Chromosome mutations can be attributedChromosome mutations can be attributedto many environmental causes (radiation,to many environmental causes (radiation,viruses, some chemicals).viruses, some chemicals).

Chromosome structure changes canChromosome structure changes caninclude: deletion, duplication, inversion,include: deletion, duplication, inversion,and translation.and translation.

A. DELETION:A. DELETION: Chromosome ends severs orChromosome ends severs orwhen two severed parts result in segmentwhen two severed parts result in segmentloss.loss.

B. DUPLICATION:B. DUPLICATION: duplicated segment in oneduplicated segment in onechromosome.chromosome.

C. INVERSION:C. INVERSION: chromosome segmentchromosome segmentturned 180 degrees.turned 180 degrees.

D. TRANSLOCATION:D. TRANSLOCATION: A chromosomeA chromosomesegment switch occurs betweensegment switch occurs betweenPicture from Human Biology by Sylvia S. Mader Page

397


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Chromosome Changes ContinuedChromosome Changes ContinuedDELETION SYNDROMES:DELETION SYNDROMES: Williams Syndrome occursWilliams Syndrome occurs

when chromosome 7s end piece breaks off. Proteinwhen chromosome 7s end piece breaks off. Proteinelastin is not produced to missing gene, affecting skinelastin is not produced to missing gene, affecting skinand cardiovascular system. Cri du chat Syndrome occursand cardiovascular system. Cri du chat Syndrome occurs

when chromosome 5s end piece breaks off. Produceswhen chromosome 5s end piece breaks off. Producesfacial and head size abnormalities as well as mentalfacial and head size abnormalities as well as mental

retardation.retardation.

TRANSLOCATION SYNDROMES: TRANSLOCATION SYNDROMES: Allele breakage in twoAllele breakage in twoplaces. Translocation between chromosomes can beplaces. Translocation between chromosomes can be

responsible for physical abnormalities as well asresponsible for physical abnormalities as well ascancers.cancers.


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Cancer CellsCancer Cells Cancer: Causes and PreventionCancer: Causes and Prevention Cancer DiagnosisCancer Diagnosis Cancer TreatmentCancer Treatment

Part 2Part 2


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Cancer Cells:Cancer Cells: CharacteristicsCharacteristicsLack Differentiation:Lack Differentiation: Cancer cells do not look like tissue cells nor do they have aCancer cells do not look like tissue cells nor do they have aspecific duty in body functions.specific duty in body functions.

Abnormal Nuclei:Abnormal Nuclei: Enlarged nuclei which may possess irregular chromosome numbersEnlarged nuclei which may possess irregular chromosome numbersand abnormal chromosomes.and abnormal chromosomes.Replicative Potential:Replicative Potential: Cancer cells are unlimited in replication and have the ability toCancer cells are unlimited in replication and have the ability torebuild telomerase.rebuild telomerase.

Form Tumors:Form Tumors: Tumors are formed because the cancer cells layer themselves while Tumors are formed because the cancer cells layer themselves whilecontinuing to grow.continuing to grow.

Growth Factors:Growth Factors: Cancer cells do not respond to growth factors, therefore they do notCancer cells do not respond to growth factors, therefore they do notstop duplicating.stop duplicating.

Cells Become Abnormal:Cells Become Abnormal: Cancer development has three stages, initiation, promotion,Cancer development has three stages, initiation, promotion,and progression; the development is known asand progression; the development is known as CARCINOGENESISCARCINOGENESIS ..

Angiogenesis:Angiogenesis: Formation of new blood vessels to aid in distribution of oxygen andFormation of new blood vessels to aid in distribution of oxygen andnutrients to cancer cells.nutrients to cancer cells.

Metastasis: Cancer cells have the ability to invade and spread to other portions of theMetastasis: Cancer cells have the ability to invade and spread to other portions of thebody away from its initial place of development. Tissue becomes invaded after cancerbody away from its initial place of development. Tissue becomes invaded after cancercells produce proteinase enzymes which cause membrane degradation.cells produce proteinase enzymes which cause membrane degradation.

Cancer cells do not undergoCancer cells do not undergo APOPTOSISAPOPTOSIS , or cell death. TELOMERES is a repetitive DNA, or cell death. TELOMERES is a repetitive DNAsequence at the ends of chromosomes which aids in helping cells reproduce bysequence at the ends of chromosomes which aids in helping cells reproduce by

protecting chromosomes. Eventually telomeres get shortened, leading to apoptosis.protecting chromosomes. Eventually telomeres get shortened, leading to apoptosis.BENIGN TUMORSBENIGN TUMORS are usually encircled by a capsule, butare usually encircled by a capsule, but CANCER IN SITUCANCER IN SITU is not alwaysis not always


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Cancer Cells:Cancer Cells: Caused by Genetic DiseaseCaused by Genetic Disease

PROTO-ONCO GENES:PROTO-ONCO GENES: Promote cell reproduction, stops apoptosis, producePromote cell reproduction, stops apoptosis, produceacceleration of cell division. When these genes mutate they becomeacceleration of cell division. When these genes mutate they becomeONCOGENESONCOGENES , or cancer initiating. When a signal activates a cell to divide, it, or cancer initiating. When a signal activates a cell to divide, itis known as ais known as a GROWTH FACTORGROWTH FACTOR . Proto-oncogenes have the ability to code for. Proto-oncogenes have the ability to code forgrowth factors. They can also turn ongrowth factors. They can also turn on CYCLINCYCLIN, a cell cycle protein, which, a cell cycle protein, whichencourages mitosis. A proto-oncogene also has the ability to code for aencourages mitosis. A proto-oncogene also has the ability to code for a

protein which makes P53, a protein which encourages apoptosis, unavailable.protein which makes P53, a protein which encourages apoptosis, unavailable. TUMOR-SUPPRESSOR GENES: TUMOR-SUPPRESSOR GENES: Slows cell reproduction and encouragesSlows cell reproduction and encouragesapoptosis. The mutated gene generations lack certain proteins that haveapoptosis. The mutated gene generations lack certain proteins that havefunctions related to apoptosis and cell cycle.functions related to apoptosis and cell cycle.

Gene MutationsGene Mutations

Picture fromHuman Biology

by Sylvia S.Normal Precancerou Cancerous


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Cancer: Causes and PreventionCancer: Causes and PreventionHEREDITY:HEREDITY: Children inherit two copies of every gene, one copy being fromChildren inherit two copies of every gene, one copy being fromeach of their parents. The chance of getting cancer is increased if both copieseach of their parents. The chance of getting cancer is increased if both copiesare mutated. If only one copy is mutated, cancer will only develop where andare mutated. If only one copy is mutated, cancer will only develop where andwhen the second copy mutates (tumor-suppressing genes). Some proto-when the second copy mutates (tumor-suppressing genes). Some proto-oncogene mutations can cause cancer with only one mutated gene, such as aoncogene mutations can cause cancer with only one mutated gene, such as aRET gene.RET gene.

ENVIRONMENTAL CARCINOGENS:ENVIRONMENTAL CARCINOGENS: Mutations can be caused by substancesMutations can be caused by substancesknown asknown as MUTAGENMUTAGEN . A carcinogen is a mutagen because it is known to cause. A carcinogen is a mutagen because it is known to cause

mutations. Different types of radiation, from UV light to radon gas can disturbmutations. Different types of radiation, from UV light to radon gas can disturbDNA and lead to mutations. The radiation from the atomic bomb left toDNA and lead to mutations. The radiation from the atomic bomb left togeneration after generation of mutations for the people who were in thegeneration after generation of mutations for the people who were in thevicinity of the radiation. Organic chemicals found in tobacco are responsiblevicinity of the radiation. Organic chemicals found in tobacco are responsiblefor mutations and protein suppressing (p53). Also, pollutants found in thefor mutations and protein suppressing (p53). Also, pollutants found in theenvironment such as pesticides and asbestos have been linked to mutation of environment such as pesticides and asbestos have been linked to mutation of genes and cancers. Lastly, the following viruses have been linked as possiblygenes and cancers. Lastly, the following viruses have been linked as possiblycancer causing: hepatitis B and C, Epstein-Barr, and HPV.cancer causing: hepatitis B and C, Epstein-Barr, and HPV.

DIETARY CHOICES:DIETARY CHOICES: Evidence has shown that high-fat diets, especially onesEvidence has shown that high-fat diets, especially oneswith a plethora of refined foods, lead to obesity and may contribute towith a plethora of refined foods, lead to obesity and may contribute tonegative effects on human systems. Proper nutrition and exercise may helpnegative effects on human systems. Proper nutrition and exercise may help

to decrease ones chance of developing certain cancers; consuming high-fiberto decrease ones chance of developing certain cancers; consuming high-fiberfoods, taking vitamins, avoiding tobacco, alcohol, unprotected sun exposure,foods, taking vitamins, avoiding tobacco, alcohol, unprotected sun exposure,


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Cancer CellsCancer Cells Cancer: Causes and PreventionCancer: Causes and Prevention

Cancer DiagnosisCancer Diagnosis Cancer TreatmentCancer Treatment


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Picture from http://www.cancer.org/downloads/COM/05AprilPresentation.pdf

Cancer Diagnosis ContinuedCance r Diagnosis Continued The American Cancer Society hasalso come out with the ABCD Rule

regarding Melanoma (skin tumors).

d


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Cancer Diagnosis ContinuedCancer Di agnosis ContinuedBlood, urine, and tissue tests known as TUMOR MARKER TESTS can be run toBlood, urine, and tissue tests known as TUMOR MARKER TESTS can be run todetermine if cancer exists. The body produces substances (tumor markers) indetermine if cancer exists. The body produces substances (tumor markers) inresponse to cancer growth. Tumor markers can be used to diagnose cancerresponse to cancer growth. Tumor markers can be used to diagnose cancer

and determine if cancer has returned in a patient.and determine if cancer has returned in a patient.When researchingWhen researching The National Cancer Institutes The National Cancer Institutes website for information onwebsite for information onthe future of tumor marker tests, I found the following:the future of tumor marker tests, I found the following:

Cancer researchers are turning to proteomics (the study of protein shape,Cancer researchers are turning to proteomics (the study of protein shape,function, and patterns of expression) in hopes of developing better cancerfunction, and patterns of expression) in hopes of developing better cancerscreening and treatment options. Proteomics technology is being used toscreening and treatment options. Proteomics technology is being used tosearch for proteins that may serve as markers of disease in its early stages,search for proteins that may serve as markers of disease in its early stages,or predict the effectiveness of treatment or the chance of the diseaseor predict the effectiveness of treatment or the chance of the diseasereturning after treatment has ended.returning after treatment has ended.

Genetic testing for mutations, proto-oncogenes and tumor-suppressor genesGenetic testing for mutations, proto-oncogenes and tumor-suppressor genesare also helping with early detection of cancers.are also helping with early detection of cancers.

Early detection, prevention, and ability to cure cancers is becomingpossible through our advancements in science and technologies.

Quote from http://www.cancer.gov/cancertopics/factsheet/Detection/tumor-


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C T


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Cancer TreatmentCancer Treatment

SurgerySurgery can remove cancer in situ and is usually followed up by alternativecan remove cancer in situ and is usually followed up by alternativemethods to ensure the extinction of the cancer incase any cells were leftmethods to ensure the extinction of the cancer incase any cells were leftbehind.behind.

Radiation therapyRadiation therapy is effective on cancer cells by disrupting their cell cycleis effective on cancer cells by disrupting their cell cycleand chromosomal breakage. Radiation targets specific areas where theand chromosomal breakage. Radiation targets specific areas where the

cancer is known to be growing.cancer is known to be growing.ChemotherapyChemotherapy kills cancer cells by injuring their DNA or obstructing DNAkills cancer cells by injuring their DNA or obstructing DNAsynthesis. Chemotherapy is effective in that it travels throughout the wholesynthesis. Chemotherapy is effective in that it travels throughout the wholebody versus treating localized areas.body versus treating localized areas.

Surgery, radiation, and chemotherapy have all proven toSurgery, radiation, and chemotherapy have all proven tobe helpful in the fight against cancer.be helpful in the fight against cancer.

Chemotherapy can

spread to all parts of the body throughbloodstream

Radiation therapycan help targetlocalized sites

Pictures from Human Biology by Sylvia Mader Page 415 andhttp://www.urologychannel.com/bladdercancer/surgery.shtml

Pictures show A. bladder tumor B. Cutting

tumor

d


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Cancer Treatments ContinuedCancer Treatments Continued

IMMUNOTHERAPY:IMMUNOTHERAPY: Different treatment tactics aiming to adjust ones immuneDifferent treatment tactics aiming to adjust ones immune

system to aid in preventing healing cancer. In cancer, immunotherapy triessystem to aid in preventing healing cancer. In cancer, immunotherapy triesto strengthen ones own immune system in hopes it will strengthen to fightto strengthen ones own immune system in hopes it will strengthen to fightagainst cancer. This is known asagainst cancer. This is known as ACTIVE IMMUNOTHERAPIESACTIVE IMMUNOTHERAPIES . Another. Another

strategy is calledstrategy is called PASSIVE IMMUNOTHERAPIESPASSIVE IMMUNOTHERAPIES which manufactures certainwhich manufactures certainantibodies of the immune system outside the body and then injects them intoantibodies of the immune system outside the body and then injects them into

the body to help fight cancer. Some of the antibodies have radioactivethe body to help fight cancer. Some of the antibodies have radioactive

material attached to them or are attached with chemotherapy drugs to helpmaterial attached to them or are attached with chemotherapy drugs to helpfight and poison cancer cells. Other antibodies are consideredfight and poison cancer cells. Other antibodies are considered NAKEDNAKED, not, notpossessing any attached drugs of radioactive materials, and are used bypossessing any attached drugs of radioactive materials, and are used by

attaching to cancer cells and signaling for their destruction.attaching to cancer cells and signaling for their destruction.

P53 Gene Therapy:P53 Gene Therapy: The p53 protein, which acts as a tumor suppressor by The p53 protein, which acts as a tumor suppressor byinitiating apoptosis, changes in the presents of cancer; allowing cancer to runinitiating apoptosis, changes in the presents of cancer; allowing cancer to run

ramped. Scientists are working on a way to repair the damaged protein soramped. Scientists are working on a way to repair the damaged protein sothat it can function correctly in the presence of cancer.that it can function correctly in the presence of cancer.


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American Cancer Society. Immunotherapy. 14 Dec 2006. Accessed 3 Feb 2008.American Cancer Society. Immunotherapy. 14 Dec 2006. Accessed 3 Feb 2008...

American Cancer Society. Reducing The Risk of Skin Cancer. Apr 2005. Accessed 3 Feb 2008.American Cancer Society. Reducing The Risk of Skin Cancer. Apr 2005. Accessed 3 Feb 2008.

.>.

"Breast cancer.""Breast cancer." Wikipedia, The Free EncyclopediaWikipedia, The Free Encyclopedia . 7 Feb 2008, 03:01 UTC. Wikimedia Foundation,. 7 Feb 2008, 03:01 UTC. Wikimedia Foundation,Inc. 3 FebInc. 3 Feb 20082008

.>.

Mader, Sylvia S.Mader, Sylvia S. Human BiologyHuman Biol ogy . New York: The McGraw-Hill Companies, Inc, 2008. Pages. New York: The McGraw-Hill Companies, Inc, 2008. Pages 378-418.

National Cancer Institute. Tumor Markers: Questions and Answers. Accessed 2 Feb 2008.National Cancer Institute. Tumor Markers: Questions and Answers. Accessed 2 Feb 2008.

..

"Ovarian cancer.""Ovarian cancer." Wikipedia, The Free EncyclopediaWikipedia, The Free Encyclopedia . 2 Feb 2008, 00:21 UTC. Wikimedia. 2 Feb 2008, 00:21 UTC. WikimediaFoundation, Inc. 2 FebFoundation, Inc. 2 Feb 20082008

.>.

Urology Channel. Bladder Cancer. Healthcommunities.com, Inc. 27 Nov 2007. 2 Feb 2008.Urology Channel. Bladder Cancer. Healthcommunities.com, Inc. 27 Nov 2007. 2 Feb 2008.

..

Works CitedWorks Cited
http://www.cancer.org/downloads/COM/05AprilPresentation.pdfhttp://www.cancer.org/downloads/COM/05AprilPresentation.pdfhttp://en.wikipedia.org/w/index.php?title=Breast_cancer&oldid=189654770http://en.wikipedia.org/w/index.php?title=Breast_cancer&oldid=189654770http://en.wikipedia.org/w/index.php?title=Ovarian_cancer&oldid=188496524http://en.wikipedia.org/w/index.php?title=Ovarian_cancer&oldid=188496524http://en.wikipedia.org/w/index.php?title=Ovarian_cancer&oldid=188496524http://en.wikipedia.org/w/index.php?title=Breast_cancer&oldid=189654770http://www.cancer.org/downloads/COM/05AprilPresentation.pdf

compendium review - genetics 18&19

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