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    <link:label id="lab_ptv_ShortTermInvestments_label_en" xlink:label="lab_ptv_ShortTermInvestments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Short-term Investments</link:label>
    <link:label id="lab_ptv_ShortTermInvestments_documentation_en" xlink:label="lab_ptv_ShortTermInvestments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Short-term Investments</link:label>
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    <link:label id="lab_ptv_ReceiptOfPaymentOfSublease_label_en" xlink:label="lab_ptv_ReceiptOfPaymentOfSublease" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Receipt of payment of sublease</link:label>
    <link:label id="lab_ptv_ReceiptOfPaymentOfSublease_documentation_en" xlink:label="lab_ptv_ReceiptOfPaymentOfSublease" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Receipt of payment of sublease</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ReceiptOfPaymentOfSublease" xlink:href="213800LVPDNO2Z9T9I39-2022-12-31.xsd#ptv_ReceiptOfPaymentOfSublease"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ReceiptOfPaymentOfSublease" xlink:to="lab_ptv_ReceiptOfPaymentOfSublease" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards_label_en" xlink:label="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Increase Decrease in reclassification of equity settled awards into liability awards</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards_documentation_en" xlink:label="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Increase Decrease in reclassification of equity settled awards into liability awards</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:href="213800LVPDNO2Z9T9I39-2022-12-31.xsd#ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards"/>
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    <link:label id="lab_ifrs-full_NumberOfSharesIssued_4109109a-5c6d-47b3-80df-c1a854a7ba0b_periodStartLabel_en" xlink:label="lab_ifrs-full_NumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Balance Share Capital (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesIssued_a007d8d2-aa13-4b93-907d-5723ccb40e8a_periodEndLabel_en" xlink:label="lab_ifrs-full_NumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Balance Share Capital (in shares)</link:label>
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    <link:label id="lab_ptv_DeconsolidatedFormerSubsidiaryOperatingCompaniesMember_label_en" xlink:label="lab_ptv_DeconsolidatedFormerSubsidiaryOperatingCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Deconsolidated former Subsidiary Operating Companies [Member]</link:label>
    <link:label id="lab_ptv_DeconsolidatedFormerSubsidiaryOperatingCompaniesMember_documentation_en" xlink:label="lab_ptv_DeconsolidatedFormerSubsidiaryOperatingCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Deconsolidated former Subsidiary Operating Companies</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DeconsolidatedFormerSubsidiaryOperatingCompaniesMember" xlink:href="213800LVPDNO2Z9T9I39-2022-12-31.xsd#ptv_DeconsolidatedFormerSubsidiaryOperatingCompaniesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DeconsolidatedFormerSubsidiaryOperatingCompaniesMember" xlink:to="lab_ptv_DeconsolidatedFormerSubsidiaryOperatingCompaniesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CashReceiptsFromRepaymentOfCurrentReceivablesDueFromAssociatesClassifiedAsInvestingActivities_label_en" xlink:label="lab_ptv_CashReceiptsFromRepaymentOfCurrentReceivablesDueFromAssociatesClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Cash Receipts From Repayment Of Current Receivables Due From Associates, Classified As Investing Activities</link:label>
    <link:label id="lab_ptv_CashReceiptsFromRepaymentOfCurrentReceivablesDueFromAssociatesClassifiedAsInvestingActivities_documentation_en" xlink:label="lab_ptv_CashReceiptsFromRepaymentOfCurrentReceivablesDueFromAssociatesClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Cash Receipts From Repayment Of Current Receivables Due From Associates, Classified As Investing Activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CashReceiptsFromRepaymentOfCurrentReceivablesDueFromAssociatesClassifiedAsInvestingActivities" xlink:href="213800LVPDNO2Z9T9I39-2022-12-31.xsd#ptv_CashReceiptsFromRepaymentOfCurrentReceivablesDueFromAssociatesClassifiedAsInvestingActivities"/>
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    <link:label id="lab_ptv_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughExerciseOfShareBasedAwards_2bb07032-9951-421e-bdfa-c535ac67e19f_verboseLabel_en" xlink:label="lab_ptv_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughExerciseOfShareBasedAwards" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Increase Decrease In Number Of Ordinary Shares Issued Through Exercise Of Share-based Awards</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughExerciseOfShareBasedAwards_label_en" xlink:label="lab_ptv_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughExerciseOfShareBasedAwards" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Increase Decrease In Number Of Ordinary Shares Issued Through Exercise Of Share-based Awards</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughExerciseOfShareBasedAwards_documentation_en" xlink:label="lab_ptv_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughExerciseOfShareBasedAwards" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Increase Decrease In Number Of Ordinary Shares Issued Through Exercise Of Share-based Awards</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughExerciseOfShareBasedAwards" xlink:href="213800LVPDNO2Z9T9I39-2022-12-31.xsd#ptv_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughExerciseOfShareBasedAwards"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughExerciseOfShareBasedAwards" xlink:to="lab_ptv_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughExerciseOfShareBasedAwards" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_CashInDeconsolidatedSubsidiary_label_en" xlink:label="lab_ptv_CashInDeconsolidatedSubsidiary" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Cash In Deconsolidated Subsidiary</link:label>
    <link:label id="lab_ptv_CashInDeconsolidatedSubsidiary_documentation_en" xlink:label="lab_ptv_CashInDeconsolidatedSubsidiary" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Cash In Deconsolidated Subsidiary</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CashInDeconsolidatedSubsidiary" xlink:href="213800LVPDNO2Z9T9I39-2022-12-31.xsd#ptv_CashInDeconsolidatedSubsidiary"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CashInDeconsolidatedSubsidiary" xlink:to="lab_ptv_CashInDeconsolidatedSubsidiary" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NumberOfTreasurySharesPurchased_label_en" xlink:label="lab_ptv_NumberOfTreasurySharesPurchased" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Number Of Treasury Shares Purchased</link:label>
    <link:label id="lab_ptv_NumberOfTreasurySharesPurchased_documentation_en" xlink:label="lab_ptv_NumberOfTreasurySharesPurchased" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Number Of Treasury Shares Purchased</link:label>
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    <link:label id="lab_ptv_PurchasesOfConvertibleNote_label_en" xlink:label="lab_ptv_PurchasesOfConvertibleNote" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Purchases of Convertible Note</link:label>
    <link:label id="lab_ptv_PurchasesOfConvertibleNote_documentation_en" xlink:label="lab_ptv_PurchasesOfConvertibleNote" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Purchases of Convertible Note</link:label>
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    <link:label id="lab_ptv_PaymentToPurchaseTreasuryStock_label_en" xlink:label="lab_ptv_PaymentToPurchaseTreasuryStock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Payment To Purchase Treasury Stock</link:label>
    <link:label id="lab_ptv_PaymentToPurchaseTreasuryStock_documentation_en" xlink:label="lab_ptv_PaymentToPurchaseTreasuryStock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Payment To Purchase Treasury Stock</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PaymentToPurchaseTreasuryStock" xlink:href="213800LVPDNO2Z9T9I39-2022-12-31.xsd#ptv_PaymentToPurchaseTreasuryStock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PaymentToPurchaseTreasuryStock" xlink:to="lab_ptv_PaymentToPurchaseTreasuryStock" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_StatementOfCashFlowsLineItems_label_en" xlink:label="lab_ptv_StatementOfCashFlowsLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Statement Of Cash Flows [Line Items]</link:label>
    <link:label id="lab_ptv_StatementOfCashFlowsLineItems_documentation_en" xlink:label="lab_ptv_StatementOfCashFlowsLineItems" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Statement Of Cash Flows</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_StatementOfCashFlowsLineItems" xlink:href="213800LVPDNO2Z9T9I39-2022-12-31.xsd#ptv_StatementOfCashFlowsLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_StatementOfCashFlowsLineItems" xlink:to="lab_ptv_StatementOfCashFlowsLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives_label_en" xlink:label="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Leasehold improvements purchased through lease incentives</link:label>
    <link:label id="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives_documentation_en" xlink:label="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Leasehold improvements purchased through lease incentives</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:href="213800LVPDNO2Z9T9I39-2022-12-31.xsd#ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives"/>
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    <link:label id="lab_ifrs-full_OtherOperatingIncomeExpense_47d11d8c-b3f5-4b17-90bd-c7c6bcee592f_totalLabel_en" xlink:label="lab_ifrs-full_OtherOperatingIncomeExpense" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Other income</link:label>
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