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  <xsd:element id="iova_TwoThousandFourteenEquityIncentivePlanMember" name="TwoThousandFourteenEquityIncentivePlanMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="iova_IncreaseDecreaseInRightOfUseAssetsFromLeaseModifications" name="IncreaseDecreaseInRightOfUseAssetsFromLeaseModifications" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="iova_EquityClaim" name="EquityClaim" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="iova_TwoThousandTwentyEsppMember" name="TwoThousandTwentyEsppMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="iova_SanCarlosCaliforniaMember" name="SanCarlosCaliforniaMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="iova_PhiladelphiaPennsylvaniaMember" name="PhiladelphiaPennsylvaniaMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="iova_NewHeadquartersLeaseMember" name="NewHeadquartersLeaseMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="iova_JobCreationLoanMember" name="JobCreationLoanMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="iova_EmployeeStockPurchasePlanMember" name="EmployeeStockPurchasePlanMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="iova_AtMarketOfferingProgramMember" name="AtMarketOfferingProgramMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="iova_SalesAgreementAuthorizedSharesToBeIssuedAmount" name="SalesAgreementAuthorizedSharesToBeIssuedAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="iova_SalesAgreementCommissionMaximumPercentageOfGrossSalesProceeds" name="SalesAgreementCommissionMaximumPercentageOfGrossSalesProceeds" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="iova_DebtInstrumentAmountThatWillBeForgivenByLenderPerFullTimeOrFullTimeEquivalentEmployee" name="DebtInstrumentAmountThatWillBeForgivenByLenderPerFullTimeOrFullTimeEquivalentEmployee" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="iova_ThresholdAverageSalaryOfFullTimeEmployeesForLoanForgiveness" name="ThresholdAverageSalaryOfFullTimeEmployeesForLoanForgiveness" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="iova_DebtInstrumentTermOverWhichAverageNumberOfFTEmployeesEmployedAreCalculated" name="DebtInstrumentTermOverWhichAverageNumberOfFTEmployeesEmployedAreCalculated" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="iova_WeightedAveragePricePerShare" name="WeightedAveragePricePerShare" nillable="true" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="iova_MoffittLicenseAgreementTwoAmendedAndRestatedMember" name="MoffittLicenseAgreementTwoAmendedAndRestatedMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="iova_TwoThousandTwentyOneInducementPlanMember" name="TwoThousandTwentyOneInducementPlanMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="iova_CashCashEquivalentsAndShortTermInvestmentsAndRestrictedCashTotal" name="CashCashEquivalentsAndShortTermInvestmentsAndRestrictedCashTotal" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <xsd:element id="iova_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiabilityFromLeaseModifications" name="RightOfUseAssetObtainedInExchangeForOperatingLeaseLiabilityFromLeaseModifications" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element id="iova_Rightofuseassetobtainedinexchangeforoperatingleaseliabilityfromnewleases" name="Rightofuseassetobtainedinexchangeforoperatingleaseliabilityfromnewleases" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element name="UtilityEquipmentMember" id="iova_UtilityEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TenantImprovementAllowanceReimbursementReceived" id="iova_TenantImprovementAllowanceReimbursementReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="CashCashEquivalentsInvestmentsAndFairValueMeasurementsAbstract" id="iova_CashCashEquivalentsInvestmentsAndFairValueMeasurementsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RestrictedStockUnitsRsusAndPerformanceBasedRestrictedStockUnitsPrsusMember" id="iova_RestrictedStockUnitsRsusAndPerformanceBasedRestrictedStockUnitsPrsusMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LetterOfCreditForCommercialManufacturingFacilityMember" id="iova_LetterOfCreditForCommercialManufacturingFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LetterOfCreditForBenefitOfLandlordForHeadquartersLeaseMember" id="iova_LetterOfCreditForBenefitOfLandlordForHeadquartersLeaseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DecreaseInLettersOfCreditOnLeaseExpiration" id="iova_DecreaseInLettersOfCreditOnLeaseExpiration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="MinimumRestrictedSecurityDeposit" id="iova_MinimumRestrictedSecurityDeposit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="SponsoredResearchAgreementMember" id="iova_SponsoredResearchAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CollaborationArrangementTerminationNoticePeriodBeforeRegulatoryApproval" id="iova_CollaborationArrangementTerminationNoticePeriodBeforeRegulatoryApproval" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="FirstWuxiManufacturingAndServicesAgreementMember" id="iova_FirstWuxiManufacturingAndServicesAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SecondWuxiManufacturingAndServicesAgreementMember" id="iova_SecondWuxiManufacturingAndServicesAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationsNet" id="iova_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="SecondSalesAgreementMember" id="iova_SecondSalesAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedAndExpectedToVestOutstandingNumber" id="iova_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedAndExpectedToVestOutstandingNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedAndExpectedToVestOutstandingWeightedAverageGrantDateFairValue" id="iova_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedAndExpectedToVestOutstandingWeightedAverageGrantDateFairValue" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="CollaborationArrangementPeriodToAddressIssuesWithinReceiptOfResponseLetter" id="iova_CollaborationArrangementPeriodToAddressIssuesWithinReceiptOfResponseLetter" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DeferredTaxAssetsCapitalizedResearchAndDevelopment" id="iova_DeferredTaxAssetsCapitalizedResearchAndDevelopment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="NumberOfStatementsOfWorkUnderAgreement" id="iova_NumberOfStatementsOfWorkUnderAgreement" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="SalesAgreement2023Member" id="iova_SalesAgreement2023Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ProleukinMember" id="iova_ProleukinMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AssetAcquisitionPaymentForCertainInventory" id="iova_AssetAcquisitionPaymentForCertainInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="AssembledWorkforceMember" id="iova_AssembledWorkforceMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCash" id="iova_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCash" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" id="iova_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" id="iova_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiability" id="iova_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="AssetAcquisitionDeferredConsiderationTerm" id="iova_AssetAcquisitionDeferredConsiderationTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NetProceedsFromPublicOffering" id="iova_NetProceedsFromPublicOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="SecurityDepositForFutureMilestonePaymentInAssetAcquisition" id="iova_SecurityDepositForFutureMilestonePaymentInAssetAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="SupplyAgreementAutomaticRenewalTerm" id="iova_SupplyAgreementAutomaticRenewalTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="InventoriesAndCostOfSalesPolicyTextBlock" id="iova_InventoriesAndCostOfSalesPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="AdjustmentsToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNetShares" id="iova_AdjustmentsToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNetShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NumberOfHistoricalMasterCellBankLicenseAndWorkingCellBankTransferAgreement" id="iova_NumberOfHistoricalMasterCellBankLicenseAndWorkingCellBankTransferAgreement" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="NumberOfHistoricalLicenseAgreement" id="iova_NumberOfHistoricalLicenseAgreement" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="LicenseAgreementMilestonePaymentsPayable" id="iova_LicenseAgreementMilestonePaymentsPayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LicenseAgreementMilestonePayment" id="iova_LicenseAgreementMilestonePayment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ManufacturingAndSupplyAgreementWithBoehringerIngelheimBiopharmaceuticalsGmbhMember" id="iova_ManufacturingAndSupplyAgreementWithBoehringerIngelheimBiopharmaceuticalsGmbhMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LicenseAgreementPercentOfMilestonePaymentsReimbursable" id="iova_LicenseAgreementPercentOfMilestonePaymentsReimbursable" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NovartisPharmaAgAndRelatedEntitiesLicenseAgreementMember" id="iova_NovartisPharmaAgAndRelatedEntitiesLicenseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PatentLicenseAgreementRelatedToDevelopmentAndManufactureOfTilTherapiesMember" id="iova_PatentLicenseAgreementRelatedToDevelopmentAndManufactureOfTilTherapiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AccruedInventoryCurrent" id="iova_AccruedInventoryCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="CollaborativeArrangementAmountRequiredToBeRemitted" id="iova_CollaborativeArrangementAmountRequiredToBeRemitted" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="CollaborativeArrangementPeriodToRemitRequiredAmount" id="iova_CollaborativeArrangementPeriodToRemitRequiredAmount" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DeferredTaxLiabilitiesRightOfUseAssets" id="iova_DeferredTaxLiabilitiesRightOfUseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="PublicOfferingMember" id="iova_PublicOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
</xsd:schema>
