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  <element id="bpmc_OperatingLeasesBaseAnnualRentInitial" name="OperatingLeasesBaseAnnualRentInitial" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_OperatingLeasesBaseAnnualRentMaximum" name="OperatingLeasesBaseAnnualRentMaximum" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_OperatingLeasesAllowanceForLeaseholdImprovements" name="OperatingLeasesAllowanceForLeaseholdImprovements" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRate" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRate" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_DeferredIncomeTaxLiabilitiesExceptDebtDiscount" name="DeferredIncomeTaxLiabilitiesExceptDebtDiscount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_StockIssuedDuringPeriodValueWarrantsExercised" name="StockIssuedDuringPeriodValueWarrantsExercised" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_StockIssuedDuringPeriodSharesWarrantsExercised" name="StockIssuedDuringPeriodSharesWarrantsExercised" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_WarrantsPolicyPolicyTextBlock" name="WarrantsPolicyPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_DeferredTaxLiabilityDebtDiscount" name="DeferredTaxLiabilityDebtDiscount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_PreferredStockNumberOfSeries" name="PreferredStockNumberOfSeries" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_DeferredTaxAssetsDeferredLeaseIncentive" name="DeferredTaxAssetsDeferredLeaseIncentive" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_NetOperatingLossCarryforwardStockCompensation" name="NetOperatingLossCarryforwardStockCompensation" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_AccruedPropertyAndEquipmentCostsCurrent" name="AccruedPropertyAndEquipmentCostsCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_DebtInstrumentNumberOfTranches" name="DebtInstrumentNumberOfTranches" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_UnbilledReceivablesIncludingReimbursableCostsCurrent" name="UnbilledReceivablesIncludingReimbursableCostsCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_AnnualCumulativeIncreasePercentageOfNumberOfShareOfCommonStockIssuedAndOutstanding" name="AnnualCumulativeIncreasePercentageOfNumberOfShareOfCommonStockIssuedAndOutstanding" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_CommonStockIncreaseCapitalSharesReservedForFutureIssuance" name="CommonStockIncreaseCapitalSharesReservedForFutureIssuance" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_MilestoneAchievementPaymentsReceivable" name="MilestoneAchievementPaymentsReceivable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_LicensedProductRoyaltyTermFromFirstCommercialSaleOption1" name="LicensedProductRoyaltyTermFromFirstCommercialSaleOption1" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_LicensedProductRoyaltyTermFromFirstCommercialSaleOption2" name="LicensedProductRoyaltyTermFromFirstCommercialSaleOption2" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" name="TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_TemporaryEquityStockValueConverted" name="TemporaryEquityStockValueConverted" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_TemporaryEquityStockSharesConverted" name="TemporaryEquityStockSharesConverted" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityReclassificationToEquity" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityReclassificationToEquity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_ExtensionPeriodExpiredOnPriorLease" name="ExtensionPeriodExpiredOnPriorLease" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_AccretionOfPremiumsAndDiscountsOnInvestments" name="AccretionOfPremiumsAndDiscountsOnInvestments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_CashEquivalentAndAvailableForSaleDebtSecuritiesAmortizedCostBasis" name="CashEquivalentAndAvailableForSaleDebtSecuritiesAmortizedCostBasis" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_CashEquivalentsAndAvailableForSaleSecuritiesDebtSecuritiesFairValue" name="CashEquivalentsAndAvailableForSaleSecuritiesDebtSecuritiesFairValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_AverageMaturityOfAvailableForSaleSecurity" name="AverageMaturityOfAvailableForSaleSecurity" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_RocheCollaborationAndLicenseArrangementMember" name="RocheCollaborationAndLicenseArrangementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_AlexionCollaborativeArrangementMember" name="AlexionCollaborativeArrangementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_NumberOfCollaborationPrograms" name="NumberOfCollaborationPrograms" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_NumberOfCollaborationProgramsWithSelectedTargets" name="NumberOfCollaborationProgramsWithSelectedTargets" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_NumberOfAdditionalCollaborationProgramsToSelectTargets" name="NumberOfAdditionalCollaborationProgramsToSelectTargets" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_PriorToExerciseLicenseRightOptionMember" name="PriorToExerciseLicenseRightOptionMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_ExerciseOfLicenseOptionProductNotCommerciallySoldMember" name="ExerciseOfLicenseOptionProductNotCommerciallySoldMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_NumberOfLicenseOptionRights" name="NumberOfLicenseOptionRights" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_ExerciseOfLicenseRightOptionMember" name="ExerciseOfLicenseRightOptionMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_RocheMember" name="RocheMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_NumberOfCollaborationProgramsWithExclusiveCommercializationRights" name="NumberOfCollaborationProgramsWithExclusiveCommercializationRights" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_CollaborativeArrangementEligibleContingentOptionFeesAndMilestonePayments" name="CollaborativeArrangementEligibleContingentOptionFeesAndMilestonePayments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_CollaborativeArrangementEligibleOptionFeesAndMilestonePaymentsPriorToLicensingAcrossAllPrograms" name="CollaborativeArrangementEligibleOptionFeesAndMilestonePaymentsPriorToLicensingAcrossAllPrograms" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_ExerciseOfLicenseOptionProductCommerciallySoldMember" name="ExerciseOfLicenseOptionProductCommerciallySoldMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_StockIssuanceCostsIncurredButNotYetPaidNoncashOrPartialNoncashTransaction" name="StockIssuanceCostsIncurredButNotYetPaidNoncashOrPartialNoncashTransaction" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_AchievedMilestonePaymentReceivedToBeRecognizedOverPerformancePeriod" name="AchievedMilestonePaymentReceivedToBeRecognizedOverPerformancePeriod" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_RefundProvisionsWithinCollaborationAgreement" name="RefundProvisionsWithinCollaborationAgreement" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_NumberOfCollaborationProgramsStartedInFirstHalfOfYear" name="NumberOfCollaborationProgramsStartedInFirstHalfOfYear" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_IncreaseDecreaseInDeferredRent" name="IncreaseDecreaseInDeferredRent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_LineOfCreditFacilityContingentIncreaseAggregateMaximumBorrowingCapacity" name="LineOfCreditFacilityContingentIncreaseAggregateMaximumBorrowingCapacity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_ReimbursableResearchAndDevelopmentCostsRecognized" name="ReimbursableResearchAndDevelopmentCostsRecognized" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_NumberOfHeldSecuritiesUnrealizedLossPosition" name="NumberOfHeldSecuritiesUnrealizedLossPosition" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_NonSubstantiveMilestonePaymentPreviouslyReceived" name="NonSubstantiveMilestonePaymentPreviouslyReceived" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="bpmc_EffectiveIncomeTaxRateReconciliationTaxCreditGeneralBusinessPercent" name="EffectiveIncomeTaxRateReconciliationTaxCreditGeneralBusinessPercent" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
