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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-08-12T20:56:07.4820282+00:00 -->
<!-- Version            : 5.0.1.648 -->
<!-- Package ID         : c09dd1cf86274daabd513ab930995ad3 -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="pmvp_OtherNonoperatingIncomeExpenseOther" name="OtherNonoperatingIncomeExpenseOther" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="pmvp_OtherNonCashLeaseExpense" name="OtherNonCashLeaseExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
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  <xsd:element id="pmvp_ReverseStockSplitPolicyTextBlock" name="ReverseStockSplitPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_CashCashEquivalentsAndMarketableSecuritiesPolicyTextBlock" name="CashCashEquivalentsAndMarketableSecuritiesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_ConcentrationOfCreditRiskAndOtherRisksAndUncertaintiesPolicyTextBlock" name="ConcentrationOfCreditRiskAndOtherRisksAndUncertaintiesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
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  <xsd:element id="pmvp_AllowanceOnBehalfOfLessorForConstructionOfOfficeSpace" name="AllowanceOnBehalfOfLessorForConstructionOfOfficeSpace" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
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  <xsd:element id="pmvp_OperatingLeasesExtendedMonthAndYear" name="OperatingLeasesExtendedMonthAndYear" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_ReimbursementsReceivedFromLessee" name="ReimbursementsReceivedFromLessee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="pmvp_LesseeOperatingLeaseLiabilityPaymentsNetOfRepaymentsDue" name="LesseeOperatingLeaseLiabilityPaymentsNetOfRepaymentsDue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
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  <xsd:element id="pmvp_SubleaseWithTenantOfficeSpaceStartingPeriod" name="SubleaseWithTenantOfficeSpaceStartingPeriod" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
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  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseOfAuthorizedSharesPercentOfCommonStockOutstanding" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseOfAuthorizedSharesPercentOfCommonStockOutstanding" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="pmvp_CommonStockCapitalSharesReservedForFutureIssuanceAdditionalSharesReservedMinimum" name="CommonStockCapitalSharesReservedForFutureIssuanceAdditionalSharesReservedMinimum" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="pmvp_CommonStockCapitalSharesReservedForFutureIssuanceAdditionalSharesReservedMaximum" name="CommonStockCapitalSharesReservedForFutureIssuanceAdditionalSharesReservedMaximum" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="pmvp_TwoThousandTwentyEquityIncentivePlanMember" name="TwoThousandTwentyEquityIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeesExercisedTheirRightToPurchaseShares" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeesExercisedTheirRightToPurchaseShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesOutstandingNumber" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesOutstandingNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantRetiredInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantRetiredInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantGrantsInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantGrantsInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantForfeituresInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantForfeituresInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExercisedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantExercisedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSharesAvailableForGrantRollForward" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSharesAvailableForGrantRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
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  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsRetiredInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsRetiredInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingLifeAbstract" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingLifeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
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  <xsd:element id="pmvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAbstract" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pmvp_NumberOfConsultingAgreementsMembers" name="NumberOfConsultingAgreementsMembers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pmvp_BoardOfDirectorsMember" name="BoardOfDirectorsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
