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<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
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  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract_label_en" xlink:label="lab_ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Supplemental disclosure of non-cash investment and financing activities [Abstract]</link:label>
    <link:label id="lab_ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract_documentation_en" xlink:label="lab_ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Supplemental disclosure of non-cash investment and financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract" xlink:to="lab_ptv_SupplementalDisclosureOfNonCashInvestmentAndFinancingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfFinancialPositionAbstract_038dc175-fe9c-4e98-9dcd-28b40ea6530e_terseLabel_en" xlink:label="lab_ifrs-full_StatementOfFinancialPositionAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en">Consolidated Statements of Financial Position</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfFinancialPositionAbstract" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfFinancialPositionAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract" xlink:to="lab_ifrs-full_StatementOfFinancialPositionAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PaymentToAcquireShortTermNotesReceivableFromAssociate_label_en" xlink:label="lab_ptv_PaymentToAcquireShortTermNotesReceivableFromAssociate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Payment to acquire short-term notes receivable from associate</link:label>
    <link:label id="lab_ptv_PaymentToAcquireShortTermNotesReceivableFromAssociate_documentation_en" xlink:label="lab_ptv_PaymentToAcquireShortTermNotesReceivableFromAssociate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Payment to acquire short-term notes receivable from associate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PaymentToAcquireShortTermNotesReceivableFromAssociate" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_PaymentToAcquireShortTermNotesReceivableFromAssociate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PaymentToAcquireShortTermNotesReceivableFromAssociate" xlink:to="lab_ptv_PaymentToAcquireShortTermNotesReceivableFromAssociate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ProceedsFromIssueOfSharesToNonControllingInterests_label_en" xlink:label="lab_ptv_ProceedsFromIssueOfSharesToNonControllingInterests" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Proceeds from issue of shares to non-controlling interests</link:label>
    <link:label id="lab_ptv_ProceedsFromIssueOfSharesToNonControllingInterests_documentation_en" xlink:label="lab_ptv_ProceedsFromIssueOfSharesToNonControllingInterests" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Proceeds from issue of shares to non-controlling interests</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ProceedsFromIssueOfSharesToNonControllingInterests" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_ProceedsFromIssueOfSharesToNonControllingInterests"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ProceedsFromIssueOfSharesToNonControllingInterests" xlink:to="lab_ptv_ProceedsFromIssueOfSharesToNonControllingInterests" xlink:type="arc" order="1"/>
    <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" 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" xml:lang="en">Short-term Investments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ShortTermInvestments" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_ShortTermInvestments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ShortTermInvestments" xlink:to="lab_ptv_ShortTermInvestments" xlink:type="arc" order="1"/>
    <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" 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" xml:lang="en">Receipt of payment of sublease</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ReceiptOfPaymentOfSublease" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.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_ifrs-full_FinanceIncomeCost_1c40a20b-e625-410c-b9ef-3c30ef36dcaf_totalLabel_en" xlink:label="lab_ifrs-full_FinanceIncomeCost" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Finance income (cost)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncomeCost" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinanceIncomeCost" xlink:to="lab_ifrs-full_FinanceIncomeCost" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PurchaseOfIntangibleAssetsButNotYetPaid_label_en" xlink:label="lab_ptv_PurchaseOfIntangibleAssetsButNotYetPaid" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Purchase Of Intangible Assets But Not Yet Paid</link:label>
    <link:label id="lab_ptv_PurchaseOfIntangibleAssetsButNotYetPaid_documentation_en" xlink:label="lab_ptv_PurchaseOfIntangibleAssetsButNotYetPaid" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Purchase Of Intangible Assets But Not Yet Paid</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PurchaseOfIntangibleAssetsButNotYetPaid" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_PurchaseOfIntangibleAssetsButNotYetPaid"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PurchaseOfIntangibleAssetsButNotYetPaid" xlink:to="lab_ptv_PurchaseOfIntangibleAssetsButNotYetPaid" 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" 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" 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="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:to="lab_ptv_IncreaseDecreaseInReclassificationOfEquitySettledAwardsIntoLiabilityAwards" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NoncurrentLiabilitiesFromShareBasedPaymentTransactions_label_en" xlink:label="lab_ptv_NoncurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Noncurrent Liabilities From Share Based Payment Transactions</link:label>
    <link:label id="lab_ptv_NoncurrentLiabilitiesFromShareBasedPaymentTransactions_documentation_en" xlink:label="lab_ptv_NoncurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Noncurrent Liabilities From Share Based Payment Transactions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NoncurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_NoncurrentLiabilitiesFromShareBasedPaymentTransactions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NoncurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:to="lab_ptv_NoncurrentLiabilitiesFromShareBasedPaymentTransactions" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_AdjustmentsForGainsLossesOnChangeInFairValueOfNoteReceivableDueFromAssociates_label_en" xlink:label="lab_ptv_AdjustmentsForGainsLossesOnChangeInFairValueOfNoteReceivableDueFromAssociates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Adjustments For Gains (Losses) On Change In Fair Value Of Note Receivable Due From Associates</link:label>
    <link:label id="lab_ptv_AdjustmentsForGainsLossesOnChangeInFairValueOfNoteReceivableDueFromAssociates_documentation_en" xlink:label="lab_ptv_AdjustmentsForGainsLossesOnChangeInFairValueOfNoteReceivableDueFromAssociates" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Adjustments For Gains (Losses) On Change In Fair Value Of Note Receivable Due From Associates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_AdjustmentsForGainsLossesOnChangeInFairValueOfNoteReceivableDueFromAssociates" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_AdjustmentsForGainsLossesOnChangeInFairValueOfNoteReceivableDueFromAssociates"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_AdjustmentsForGainsLossesOnChangeInFairValueOfNoteReceivableDueFromAssociates" xlink:to="lab_ptv_AdjustmentsForGainsLossesOnChangeInFairValueOfNoteReceivableDueFromAssociates" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_GainLossOnInvestmentsInNotesFromAssociates_label_en" xlink:label="lab_ptv_GainLossOnInvestmentsInNotesFromAssociates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Gain (Loss) On Investments In Notes From Associates</link:label>
    <link:label id="lab_ptv_GainLossOnInvestmentsInNotesFromAssociates_documentation_en" xlink:label="lab_ptv_GainLossOnInvestmentsInNotesFromAssociates" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Gain (Loss) On Investments In Notes From Associates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_GainLossOnInvestmentsInNotesFromAssociates" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_GainLossOnInvestmentsInNotesFromAssociates"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_GainLossOnInvestmentsInNotesFromAssociates" xlink:to="lab_ptv_GainLossOnInvestmentsInNotesFromAssociates" xlink:type="arc" order="1"/>
    <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" 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" xml:lang="en">Deconsolidated former subsidiary operating companies</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DeconsolidatedFormerSubsidiaryOperatingCompaniesMember" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.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" 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" 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="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_CashReceiptsFromRepaymentOfCurrentReceivablesDueFromAssociatesClassifiedAsInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_CashReceiptsFromRepaymentOfCurrentReceivablesDueFromAssociatesClassifiedAsInvestingActivities" xlink:to="lab_ptv_CashReceiptsFromRepaymentOfCurrentReceivablesDueFromAssociatesClassifiedAsInvestingActivities" 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" 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" xml:lang="en">Cash in deconsolidated subsidiary</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_CashInDeconsolidatedSubsidiary" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.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_NoncashInterestExpenseRoyaltyLiability_label_en" xlink:label="lab_ptv_NoncashInterestExpenseRoyaltyLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Noncash Interest Expense, Royalty Liability</link:label>
    <link:label id="lab_ptv_NoncashInterestExpenseRoyaltyLiability_documentation_en" xlink:label="lab_ptv_NoncashInterestExpenseRoyaltyLiability" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Noncash Interest Expense, Royalty Liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NoncashInterestExpenseRoyaltyLiability" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_NoncashInterestExpenseRoyaltyLiability"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NoncashInterestExpenseRoyaltyLiability" xlink:to="lab_ptv_NoncashInterestExpenseRoyaltyLiability" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NonCashItemsAbstract_label_en" xlink:label="lab_ptv_NonCashItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Non-cash items [Abstract]</link:label>
    <link:label id="lab_ptv_NonCashItemsAbstract_documentation_en" xlink:label="lab_ptv_NonCashItemsAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Non-cash items</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NonCashItemsAbstract" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_NonCashItemsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NonCashItemsAbstract" xlink:to="lab_ptv_NonCashItemsAbstract" 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" 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" xml:lang="en">Number Of Treasury Shares Purchased</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NumberOfTreasurySharesPurchased" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_NumberOfTreasurySharesPurchased"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NumberOfTreasurySharesPurchased" xlink:to="lab_ptv_NumberOfTreasurySharesPurchased" xlink:type="arc" order="1"/>
    <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" 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" xml:lang="en">Purchases of Convertible Note</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PurchasesOfConvertibleNote" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_PurchasesOfConvertibleNote"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PurchasesOfConvertibleNote" xlink:to="lab_ptv_PurchasesOfConvertibleNote" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_NonCurrentLiabilitiesRoyaltyLiabilities_label_en" xlink:label="lab_ptv_NonCurrentLiabilitiesRoyaltyLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Non-current Liabilities, Royalty Liabilities</link:label>
    <link:label id="lab_ptv_NonCurrentLiabilitiesRoyaltyLiabilities_documentation_en" xlink:label="lab_ptv_NonCurrentLiabilitiesRoyaltyLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Non-current Liabilities, Royalty Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_NonCurrentLiabilitiesRoyaltyLiabilities" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_NonCurrentLiabilitiesRoyaltyLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_NonCurrentLiabilitiesRoyaltyLiabilities" xlink:to="lab_ptv_NonCurrentLiabilitiesRoyaltyLiabilities" xlink:type="arc" order="1"/>
    <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" 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" xml:lang="en">Payment to purchase treasury stock</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PaymentToPurchaseTreasuryStock" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.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" 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" xml:lang="en">Statement Of Cash Flows</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_StatementOfCashFlowsLineItems" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.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" 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" xml:lang="en">Leasehold improvements purchased through lease incentives</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:to="lab_ptv_LeaseholdImprovementsPurchasedThroughLeaseIncentives" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IncreaseDecreaseThroughNonControllingInterestExerciseOfShareBasedAwardsInSubsidiaries_label_en" xlink:label="lab_ptv_IncreaseDecreaseThroughNonControllingInterestExerciseOfShareBasedAwardsInSubsidiaries" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Increase (Decrease) Through Non-controlling Interest Exercise Of Share-based Awards In Subsidiaries</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseThroughNonControllingInterestExerciseOfShareBasedAwardsInSubsidiaries_documentation_en" xlink:label="lab_ptv_IncreaseDecreaseThroughNonControllingInterestExerciseOfShareBasedAwardsInSubsidiaries" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Increase (Decrease) Through Non-controlling Interest Exercise Of Share-based Awards In Subsidiaries</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IncreaseDecreaseThroughNonControllingInterestExerciseOfShareBasedAwardsInSubsidiaries" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_IncreaseDecreaseThroughNonControllingInterestExerciseOfShareBasedAwardsInSubsidiaries"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IncreaseDecreaseThroughNonControllingInterestExerciseOfShareBasedAwardsInSubsidiaries" xlink:to="lab_ptv_IncreaseDecreaseThroughNonControllingInterestExerciseOfShareBasedAwardsInSubsidiaries" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_280b7070-a237-4c02-a923-987de6b325e7_totalLabel_en" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Cash flows from (used in) operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_DecreaseInNonControllingFromExpirationOfShareOptionsInSubsidiary_label_en" xlink:label="lab_ptv_DecreaseInNonControllingFromExpirationOfShareOptionsInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Decrease In Non-Controlling From Expiration Of Share Options In Subsidiary</link:label>
    <link:label id="lab_ptv_DecreaseInNonControllingFromExpirationOfShareOptionsInSubsidiary_documentation_en" xlink:label="lab_ptv_DecreaseInNonControllingFromExpirationOfShareOptionsInSubsidiary" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Decrease In Non-Controlling From Expiration Of Share Options In Subsidiary</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_DecreaseInNonControllingFromExpirationOfShareOptionsInSubsidiary" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_DecreaseInNonControllingFromExpirationOfShareOptionsInSubsidiary"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_DecreaseInNonControllingFromExpirationOfShareOptionsInSubsidiary" xlink:to="lab_ptv_DecreaseInNonControllingFromExpirationOfShareOptionsInSubsidiary" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IncreaseDecreaseThroughSettlementOfRestrictedStockUnits_label_en" xlink:label="lab_ptv_IncreaseDecreaseThroughSettlementOfRestrictedStockUnits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Increase Decrease Through Settlement Of Restricted Stock Units</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseThroughSettlementOfRestrictedStockUnits_documentation_en" xlink:label="lab_ptv_IncreaseDecreaseThroughSettlementOfRestrictedStockUnits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Increase Decrease Through Settlement Of Restricted Stock Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IncreaseDecreaseThroughSettlementOfRestrictedStockUnits" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_IncreaseDecreaseThroughSettlementOfRestrictedStockUnits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IncreaseDecreaseThroughSettlementOfRestrictedStockUnits" xlink:to="lab_ptv_IncreaseDecreaseThroughSettlementOfRestrictedStockUnits" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_StatementOfCashFlowsTable_label_en" xlink:label="lab_ptv_StatementOfCashFlowsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Statement Of Cash Flows [Table]</link:label>
    <link:label id="lab_ptv_StatementOfCashFlowsTable_documentation_en" xlink:label="lab_ptv_StatementOfCashFlowsTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Statement Of Cash Flows</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_StatementOfCashFlowsTable" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_StatementOfCashFlowsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_StatementOfCashFlowsTable" xlink:to="lab_ptv_StatementOfCashFlowsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IncreaseDecreaseThroughRevaluationOfDeferredTaxAssetsRelatedToShareBasedPaymentTransactionsEquity_label_en" xlink:label="lab_ptv_IncreaseDecreaseThroughRevaluationOfDeferredTaxAssetsRelatedToShareBasedPaymentTransactionsEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Increase (Decrease) Through Revaluation Of Deferred Tax Assets Related To Share-based Payment Transactions, Equity</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseThroughRevaluationOfDeferredTaxAssetsRelatedToShareBasedPaymentTransactionsEquity_documentation_en" xlink:label="lab_ptv_IncreaseDecreaseThroughRevaluationOfDeferredTaxAssetsRelatedToShareBasedPaymentTransactionsEquity" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Increase (Decrease) Through Revaluation Of Deferred Tax Assets Related To Share-based Payment Transactions, Equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IncreaseDecreaseThroughRevaluationOfDeferredTaxAssetsRelatedToShareBasedPaymentTransactionsEquity" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_IncreaseDecreaseThroughRevaluationOfDeferredTaxAssetsRelatedToShareBasedPaymentTransactionsEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IncreaseDecreaseThroughRevaluationOfDeferredTaxAssetsRelatedToShareBasedPaymentTransactionsEquity" xlink:to="lab_ptv_IncreaseDecreaseThroughRevaluationOfDeferredTaxAssetsRelatedToShareBasedPaymentTransactionsEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_f6200a5b-2e59-4448-a747-e1eb2d32ac71_totalLabel_en" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Cash flows from (used in) financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables_label_en" xlink:label="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Purchase of property, plant and equipment against trade and other payables</link:label>
    <link:label id="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables_documentation_en" xlink:label="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Purchase of property, plant and equipment against trade and other payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables" xlink:to="lab_ptv_PurchaseOfPropertyPlantAndEquipmentAgainstTradeAndOtherPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_67bb071a-4d54-4571-8159-6a9117889f84_totalLabel_en" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Cash flows from (used in) investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_IncreaseDecreaseThroughVestingOfShareBasedAwardsAndNetShareExerciseEquity_label_en" xlink:label="lab_ptv_IncreaseDecreaseThroughVestingOfShareBasedAwardsAndNetShareExerciseEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Increase (Decrease) Through Vesting Of Share Based Awards And Net Share Exercise, Equity</link:label>
    <link:label id="lab_ptv_IncreaseDecreaseThroughVestingOfShareBasedAwardsAndNetShareExerciseEquity_documentation_en" xlink:label="lab_ptv_IncreaseDecreaseThroughVestingOfShareBasedAwardsAndNetShareExerciseEquity" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Increase (Decrease) Through Vesting Of Share Based Awards And Net Share Exercise, Equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_IncreaseDecreaseThroughVestingOfShareBasedAwardsAndNetShareExerciseEquity" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_IncreaseDecreaseThroughVestingOfShareBasedAwardsAndNetShareExerciseEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_IncreaseDecreaseThroughVestingOfShareBasedAwardsAndNetShareExerciseEquity" xlink:to="lab_ptv_IncreaseDecreaseThroughVestingOfShareBasedAwardsAndNetShareExerciseEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities_label_en" xlink:label="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Conversion of subsidiary convertible note into preferred share liabilities</link:label>
    <link:label id="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities_documentation_en" xlink:label="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Conversion of subsidiary convertible note into preferred share liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:to="lab_ptv_ConversionOfSubsidiaryConvertibleNoteIntoPreferredShareLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_GainLossRecognizedOnDilutionOfOwnershipInterestInAssociate_label_en" xlink:label="lab_ptv_GainLossRecognizedOnDilutionOfOwnershipInterestInAssociate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Gain (Loss) Recognized On Dilution Of Ownership Interest In Associate</link:label>
    <link:label id="lab_ptv_GainLossRecognizedOnDilutionOfOwnershipInterestInAssociate_documentation_en" xlink:label="lab_ptv_GainLossRecognizedOnDilutionOfOwnershipInterestInAssociate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Gain (Loss) Recognized On Dilution Of Ownership Interest In Associate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_GainLossRecognizedOnDilutionOfOwnershipInterestInAssociate" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_GainLossRecognizedOnDilutionOfOwnershipInterestInAssociate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_GainLossRecognizedOnDilutionOfOwnershipInterestInAssociate" xlink:to="lab_ptv_GainLossRecognizedOnDilutionOfOwnershipInterestInAssociate" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ProceedsFromSaleOfFutureRoyalties_label_en" xlink:label="lab_ptv_ProceedsFromSaleOfFutureRoyalties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Proceeds From Sale Of Future Royalties</link:label>
    <link:label id="lab_ptv_ProceedsFromSaleOfFutureRoyalties_documentation_en" xlink:label="lab_ptv_ProceedsFromSaleOfFutureRoyalties" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Proceeds From Sale Of Future Royalties</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_ProceedsFromSaleOfFutureRoyalties" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_ProceedsFromSaleOfFutureRoyalties"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_ProceedsFromSaleOfFutureRoyalties" xlink:to="lab_ptv_ProceedsFromSaleOfFutureRoyalties" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_VestingOfRestrictedStockUnits_label_en" xlink:label="lab_ptv_VestingOfRestrictedStockUnits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Vesting of restricted stock units</link:label>
    <link:label id="lab_ptv_VestingOfRestrictedStockUnits_documentation_en" xlink:label="lab_ptv_VestingOfRestrictedStockUnits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Vesting of restricted stock units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_VestingOfRestrictedStockUnits" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_VestingOfRestrictedStockUnits"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_VestingOfRestrictedStockUnits" xlink:to="lab_ptv_VestingOfRestrictedStockUnits" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NumberOfSharesIssued_d4058ed0-6b71-4356-87bf-fbf05ec85380_periodStartLabel_en" xlink:label="lab_ifrs-full_NumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en">Beginning balance (in shares)</link:label>
    <link:label id="lab_ifrs-full_NumberOfSharesIssued_a3dc0fe9-1e5b-4715-b249-8a1caf252e68_periodEndLabel_en" xlink:label="lab_ifrs-full_NumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en">Ending balance (in shares)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesIssued" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NumberOfSharesIssued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NumberOfSharesIssued" xlink:to="lab_ifrs-full_NumberOfSharesIssued" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherOperatingIncomeExpense_acdeb369-386d-4fbc-9bc5-808823b1791e_totalLabel_en" xlink:label="lab_ifrs-full_OtherOperatingIncomeExpense" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Other income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherOperatingIncomeExpense" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherOperatingIncomeExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherOperatingIncomeExpense" xlink:to="lab_ifrs-full_OtherOperatingIncomeExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_SettlementOfRestrictedStockUnitsThroughIssuanceOfEquity_label_en" xlink:label="lab_ptv_SettlementOfRestrictedStockUnitsThroughIssuanceOfEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Settlement of restricted stock units through issuance of equity</link:label>
    <link:label id="lab_ptv_SettlementOfRestrictedStockUnitsThroughIssuanceOfEquity_documentation_en" xlink:label="lab_ptv_SettlementOfRestrictedStockUnitsThroughIssuanceOfEquity" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Settlement of restricted stock units through issuance of equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_SettlementOfRestrictedStockUnitsThroughIssuanceOfEquity" xlink:href="213800LVPDNO2Z9T9I39-2023-12-31.xsd#ptv_SettlementOfRestrictedStockUnitsThroughIssuanceOfEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptv_SettlementOfRestrictedStockUnitsThroughIssuanceOfEquity" xlink:to="lab_ptv_SettlementOfRestrictedStockUnitsThroughIssuanceOfEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_ptv_ChangesInOperatingAssetsAndLiabilitiesAbstract_label_en" xlink:label="lab_ptv_ChangesInOperatingAssetsAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Changes in operating assets and liabilities [Abstract]</link:label>
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