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    <element id="PMCB_EmployeeOptionsMember" name="EmployeeOptionsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price1Member" name="Price1Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price2Member" name="Price2Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price3Member" name="Price3Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price4Member" name="Price4Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price5Member" name="Price5Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price6Member" name="Price6Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price7Member" name="Price7Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price8Member" name="Price8Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price9Member" name="Price9Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price10Member" name="Price10Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price11Member" name="Price11Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price12Member" name="Price12Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price13Member" name="Price13Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price14Member" name="Price14Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price15Member" name="Price15Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price16Member" name="Price16Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price17Member" name="Price17Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price18Member" name="Price18Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Price19Member" name="Price19Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Warrant1Member" name="Warrant1Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Warrant2Member" name="Warrant2Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Warrant3Member" name="Warrant3Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Warrant4Member" name="Warrant4Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_Warrant5Member" name="Warrant5Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_VinDeBonaMember" name="VinDeBonaMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_FederalMember" name="FederalMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_StateMember" name="StateMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_FairValueOfEmbeddedDerivativeMember" name="FairValueOfEmbeddedDerivativeMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_StockIssuanceCostsMember" name="StockIssuanceCostsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_FairValueOfWarrantsMember" name="FairValueOfWarrantsMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantLiabilityMember" name="WarrantLiabilityMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_BifurcatedEmbeddedDerivativeMember" name="BifurcatedEmbeddedDerivativeMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantLiabilitiesNoncurrent" name="WarrantLiabilitiesNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ConvertiblePreferredStockAbstract" name="ConvertiblePreferredStockAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_TemporaryEquityLiquidationDividendPercentage" name="TemporaryEquityLiquidationDividendPercentage" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_TemporaryEquityLiquidationDividendValue" name="TemporaryEquityLiquidationDividendValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ChangeInFairValueOfWarrantLiability" name="ChangeInFairValueOfWarrantLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ChangeInFairValueOfDerivativeLiability" name="ChangeInFairValueOfDerivativeLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ShareBasedCompensationOptions" name="ShareBasedCompensationOptions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantIssuanceCosts" name="WarrantIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_IncreaseDecreaseInWarrantLiability" name="IncreaseDecreaseInWarrantLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_NoncashDerivativeLiabilityAtInitialFairValue" name="NoncashDerivativeLiabilityAtInitialFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_NoncashWarrantLiabilityAtInitialFairValue" name="NoncashWarrantLiabilityAtInitialFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_AccrualOfSeriesBConvertiblePreferredStockDividends" name="AccrualOfSeriesBConvertiblePreferredStockDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_ScheduleOfWarrantsOutstandingAndExercisableTableTextBlock" name="ScheduleOfWarrantsOutstandingAndExercisableTableTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageGrantDateFairValuePerShare" name="WeightedAverageGrantDateFairValuePerShare" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageGrantDateFairValuePerShareIssued" name="WeightedAverageGrantDateFairValuePerShareIssued" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageGrantDateFairValuePerShareForfeited" name="WeightedAverageGrantDateFairValuePerShareForfeited" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageGrantDateFairValueExercisable" name="WeightedAverageGrantDateFairValueExercisable" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageGrantDateFairValueVestedAndExpectedToVest" name="WeightedAverageGrantDateFairValueVestedAndExpectedToVest" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantsIssuedShares" name="WarrantsIssuedShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantExercised" name="WarrantExercised" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageExercisePriceWarrantsExercised" name="WeightedAverageExercisePriceWarrantsExercised" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantsExpired" name="WarrantsExpired" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageExercisePriceWarrantsExpired" name="WeightedAverageExercisePriceWarrantsExpired" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WarrantsExercisable" name="WarrantsExercisable" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_WeightedAverageExercisePriceWarrantsExercisable" name="WeightedAverageExercisePriceWarrantsExercisable" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_FairValueOfWarrantsIssued" name="FairValueOfWarrantsIssued" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PMCB_PreferredStockSharesDesignated" name="PreferredStockSharesDesignated" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
</schema>
