chemotherapy in gynecology by dr kiran ashok
DESCRIPTION
Chemotherapy in gynecological malignanciesTRANSCRIPT
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Chemotherapy in Chemotherapy in GynecologyGynecology
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Brief HistoryBrief History
Exposure of military seamen to mustardExposure of military seamen to mustard
gas in WW 2 resulted in marrow andgas in WW 2 resulted in marrow and
lymphoid hypoplasialymphoid hypoplasia
1943 – Yale Cancer Center 1st used1943 – Yale Cancer Center 1st used
Nitrogen Mustard to cure hematological Nitrogen Mustard to cure hematological neoplasmsneoplasms
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Brief HistoryBrief History
1946 – Sidney Farber observed folic acid1946 – Sidney Farber observed folic acid
had proliferative effect on leukemic cellhad proliferative effect on leukemic cell
growthgrowth
development of folic acid analogs to development of folic acid analogs to
inhibit folate metabolisminhibit folate metabolism
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Goals of chemotherapyGoals of chemotherapy
cure of cancercure of cancer
control of cancercontrol of cancer
palliation of symptoms of cancerpalliation of symptoms of cancer
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Synth DNA precursors,proteins, etc.
Premitotic synth ofstructures, mol’s
Cell Cycle Phases
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Cell cycle non specific drugsCell cycle non specific drugs
Can kill either dividing cells at any pointCan kill either dividing cells at any point
in the cell cycle. Examples:in the cell cycle. Examples:
Alkylating agentsAlkylating agents
Platinum compoundsPlatinum compounds
Cell-signaling inhibitorsCell-signaling inhibitors
Can kill non-dividing cells. Examples:Can kill non-dividing cells. Examples:
SteroidsSteroids
Antitumor antibioticAntitumor antibiotic
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Basic Concepts ofBasic Concepts ofChemotherapyChemotherapy
FRACTIONAL CELL KILL HYPOTHESIS -FRACTIONAL CELL KILL HYPOTHESIS - each time the chemotherapy dose is repeated, each time the chemotherapy dose is repeated,
thethe same proportion of cells not the same absolutesame proportion of cells not the same absolute number, is killed.number, is killed.
3 LOG KILL, 1 LOG REGROWTH PRINCIPLE -3 LOG KILL, 1 LOG REGROWTH PRINCIPLE - in a tumor w/ 10in a tumor w/ 101010 cells, a cycle of chemotx will cells, a cycle of chemotx will result in 10result in 1033 (3 log kill) cells dying & 10 (3 log kill) cells dying & 1077 cells cells remaining. Hence remaining. Hence repeated cyclesrepeated cycles are are
required torequired to eradicate remaining and re-growing cells.eradicate remaining and re-growing cells.
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Combination chemotherapy - indicationsCombination chemotherapy - indications
Prevention of resistant clonesPrevention of resistant clones
Cytotoxicity to resting & dividing cellsCytotoxicity to resting & dividing cells
Biochemical enhancement or effectBiochemical enhancement or effect
Sanctuary accessSanctuary access
RescueRescue
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Prevention of drug resistancePrevention of drug resistance
Reduce tumor bulk with surgery/ Reduce tumor bulk with surgery/ radiotherapyradiotherapy
Use combinations including drugs thatUse combinations including drugs that
affect resting populationaffect resting population
Schedule drugs to prevent phase escape Schedule drugs to prevent phase escape or to synchronize cell populations and or to synchronize cell populations and increase cell killincrease cell kill
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Contraindications for CTContraindications for CT
• • InfectionInfection• • NeutropeniaNeutropenia• • ThrombocytopeniaThrombocytopenia• • Severe debilitationSevere debilitation• • Pregnancy (1st trimester)Pregnancy (1st trimester)• • Major surgery <2 wks priorMajor surgery <2 wks prior• • Poor patient follow-upPoor patient follow-up• • Psychological problemPsychological problem• • Terminal illnessTerminal illness
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Classification Classification
Alkylating agentsAlkylating agents
• • Antibiotic agentsAntibiotic agents
• • Antimetabolic agentsAntimetabolic agents
• • Biologic agentsBiologic agents
• • Hormonal agentsHormonal agents
• • Plant-derived agentsPlant-derived agents
• • Novel therapiesNovel therapies
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Rang 50.4
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AntimetabolitesAntimetabolites
Mimic structures of normal metabolic Mimic structures of normal metabolic mol’smol’s Inhibit enz’s competitively ORInhibit enz’s competitively OR Inc’d into macromol’s Inc’d into macromol’s inappropriate inappropriate
structuresstructures
Kill cells in S phaseKill cells in S phaseThree main groupsThree main groups Folate antagonistsFolate antagonists Pyr analogsPyr analogs Pur analogsPur analogs
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50.8 Rand
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DactinomycinDactinomycinIntercalates in DNA minor groove between adjacent Intercalates in DNA minor groove between adjacent GC pairsGC pairs
Interferes w/ RNA polymerase movement Interferes w/ RNA polymerase movement decr’d decr’d transcr’ntranscr’n
Also may work through topoisomerase IIAlso may work through topoisomerase II BleomycinBleomycin
GlycopeptideGlycopeptide
Chelates Fe, which interacts w/ O2Chelates Fe, which interacts w/ O2
Gen’n superoxide and/or hydroxyl radicalsGen’n superoxide and/or hydroxyl radicals
Radicals degrade DNA Radicals degrade DNA fragmentation, release of fragmentation, release of free basesfree bases
Most effective in G2, also active against cells in G0Most effective in G2, also active against cells in G0
Little myelosuppression BUT pulmonary fibrosisLittle myelosuppression BUT pulmonary fibrosis
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Plant AlkaloidsPlant Alkaloids
Work at mitosisWork at mitosis
Effect tubulin, therefore microtubule Effect tubulin, therefore microtubule activityactivity Prevention spindle form’n ORPrevention spindle form’n OR Stabilize (“freeze”) polymerized microtubulesStabilize (“freeze”) polymerized microtubules
Arrest of mitosisArrest of mitosis
Other effects due to tubulin defectsOther effects due to tubulin defects Phagocytosis/chemotaxisPhagocytosis/chemotaxis Axonal transport in neuronsAxonal transport in neurons
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Investigations to be done before and Investigations to be done before and during CTduring CT
Complete haemogram including platelet Complete haemogram including platelet
count.count.
Liver function testsLiver function tests
Blood Urea & S. CreatinineBlood Urea & S. Creatinine
Chest X-RayChest X-Ray
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Chemotherapy preparationChemotherapy preparation
Hydration – 1l RLHydration – 1l RL
Antiemetics – Inj Ondonsetron 8mg i.v 8Antiemetics – Inj Ondonsetron 8mg i.v 8thth hrlyhrly
Inj. Ranitidiine 150mg 12Inj. Ranitidiine 150mg 12thth hrly hrly
Inj Dexamethasone 5mg 12Inj Dexamethasone 5mg 12thth hrly hrly
After chemotherapyAfter chemotherapy
Hydration – 1l NS with 40mg Frusemide i.vHydration – 1l NS with 40mg Frusemide i.v
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Gestational trophoblastic Gestational trophoblastic neoplasianeoplasia
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Clinical stage in GTNClinical stage in GTNAnatomic stage of trophoblastic cell Anatomic stage of trophoblastic cell tumortumorstageI tumor is located in uterusstageI tumor is located in uterus
stageII tumor spread to adnex,vagina,broad stageII tumor spread to adnex,vagina,broad ligamentligament
stageIIIstageIII tumor spread to lung,there is no tumor in tumor spread to lung,there is no tumor in reproductive systemreproductive system
stageIV metastasis to other organs stageIV metastasis to other organs
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Protocol In GTNProtocol In GTN
Stage 1 – Single agent chemotherapy or Stage 1 – Single agent chemotherapy or
hysterectomy with adjunctive chemotherapyhysterectomy with adjunctive chemotherapy
Stage 2 & 3- Stage 2 & 3- low risk- single agent CTlow risk- single agent CT
--High risk –Combination CTHigh risk –Combination CT
Stage 4 – Combination CT & resection of lung or Stage 4 – Combination CT & resection of lung or
brain metastasisbrain metastasis
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Single agent CT in GTNSingle agent CT in GTN
Inj Inj MethotrexateMethotrexate 20-40mg/m 20-40mg/m2 2 i.m twice weekly + i.m twice weekly + Folinic Folinic
AcidAcid alternate days alternate days
weekly serum Beta-hCG monitoring.weekly serum Beta-hCG monitoring.
Continue MTX until Serum Beta hCG is negative and the Continue MTX until Serum Beta hCG is negative and the
give for 3 more weeks and stop.give for 3 more weeks and stop.
If no response to MTX – Switch over to If no response to MTX – Switch over to Actinomycin DActinomycin D
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Adverse effects of MTXAdverse effects of MTX
VomitingVomiting
DiarrheaDiarrhea
Bone marrow suppression- Megaloblastic Bone marrow suppression- Megaloblastic
anemia, Pancytopeniaanemia, Pancytopenia
Desquamation & Bleeding from GITDesquamation & Bleeding from GIT
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Combination Chemotherapy in Combination Chemotherapy in GTNGTN
EMA- COEMA- CO
EtoposideEtoposide
MethotrexateMethotrexate
Actinomycin-DActinomycin-D
CyclophosphamideCyclophosphamide
VincristineVincristine
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Epithelial ovarian cancerEpithelial ovarian cancer
Treatment of epithelial ovarian cancers:Treatment of epithelial ovarian cancers:
Stage 1low grade – Staging laparotomyStage 1low grade – Staging laparotomy
Stage 1 high grade – Staging laparotomy with Stage 1 high grade – Staging laparotomy with
Chemotherapy.Chemotherapy.
Stage 2, 3 & 4 – Cytoreductive surgery with Stage 2, 3 & 4 – Cytoreductive surgery with
ChemotherapyChemotherapy
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CT in epithelial ovarian cancersCT in epithelial ovarian cancers
Combination CT with Combination CT with Carboplatin & PaclitaxelCarboplatin & Paclitaxel every 21 days for 6 cyclesevery 21 days for 6 cycles
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Adverse effectsAdverse effects
Carboplatin – Carboplatin – Bone marrow suppressionBone marrow suppression
Paclitaxel – Paclitaxel – Peripheral neuropathyPeripheral neuropathy
- Bone marrow suppression- Bone marrow suppression
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Neoadjuvant CTNeoadjuvant CT
3 cycles of CT 3 cycles of CT prior to cytoreductive surgeryprior to cytoreductive surgery in: in:
Advanced ovarian cancers where surgery is Advanced ovarian cancers where surgery is
difficult initiallydifficult initially
Massive ascitisMassive ascitis
Large pleural effusions Large pleural effusions
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Immunotherapy in ovarian cancerImmunotherapy in ovarian cancer
As second line therapyAs second line therapy
Cytokines – Interferon-alfa, Interleukin-2Cytokines – Interferon-alfa, Interleukin-2
Monoclonal antibodies directed towardsCA-125.Monoclonal antibodies directed towardsCA-125.
Antibodies against mutated p53 tumor Antibodies against mutated p53 tumor
suppressor genesuppressor gene
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Hormone therapyHormone therapy
ProgesteronesProgesterones in recurrent well in recurrent well
differentiated endometroid carcinomasdifferentiated endometroid carcinomas
Tamoxifen & Leuprolide Tamoxifen & Leuprolide in estrogen in estrogen
receptor positive tumorsreceptor positive tumors
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CT in Germ cell tumorsCT in Germ cell tumors
4 cycles of 4 cycles of BEPBEP regimen regimen
BleomycinBleomycin
EtoposideEtoposide
CisplatinCisplatin
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Adverse effectsAdverse effects
Bleomycin – Bleomycin – Pulmonary fibrosisPulmonary fibrosis
Etoposide – Etoposide – AlopeciaAlopecia,Gonadal toxicity ,Gonadal toxicity
leading to infertilityleading to infertility
Cisplatin – Severe vomiting, Cisplatin – Severe vomiting, Renal toxicityRenal toxicity, ,
ototoxicityototoxicity
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Endometrial Carcinoma- CTEndometrial Carcinoma- CT
ProgesteronesProgesterones are recommended as initial are recommended as initial
treatment for treatment for Recurrent endometrial CancerRecurrent endometrial Cancer
Medroxyprogesterone acetate 100mg 3 times a Medroxyprogesterone acetate 100mg 3 times a
day for at least 3 months.day for at least 3 months.
If progesterones are contraindicated If progesterones are contraindicated
TamoxifeneTamoxifene can be used. can be used.
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Endometrial CaEndometrial Ca
If no response to progesteronesIf no response to progesterones
CAP regimen givenCAP regimen given
CyclophosphamideCyclophosphamide
DoxorubicinDoxorubicin
CisplatinCisplatin
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Uterine sarcomasUterine sarcomas
Treatment is Exploratory laparotomy Treatment is Exploratory laparotomy followed by Chemotherapyfollowed by Chemotherapy
Doxorubicin + IfosfamideDoxorubicin + Ifosfamide
Doxorubicin – Doxorubicin – Cardiac toxicityCardiac toxicity
Ifosfamide – Hemorrhagic cystitis ( hence Ifosfamide – Hemorrhagic cystitis ( hence given with given with mesna )mesna )
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Advanced Ca CervixAdvanced Ca Cervix
Concurrent ChemoradiationConcurrent Chemoradiation with with
CisplatinCisplatin is the treatment of choice for is the treatment of choice for
advanced stageadvanced stage Ca Cx Ca Cx
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Thank you Thank you