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    <link:label id="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_42c74283-6196-4e6e-b3fc-1f87348a9752_totalLabel_en" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Net increase in cash and cash equivalents</link:label>
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    <link:label id="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability_label_en" xlink:label="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Purchase of intangible asset and investment in consideration for issuance of warrant and other liability</link:label>
    <link:label id="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability_documentation_en" xlink:label="lab_ptv_PurchaseOfIntangibleAssetAndInvestmentInConsiderationForIssuanceOfWarrantAndOtherLiability" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Purchase of intangible asset and investment in consideration for issuance of warrant and other liability</link:label>
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    <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>
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    <link:label id="lab_ifrs-full_NumberOfSharesIssued_b659b7e0-dbb3-4101-86e5-3eabb8864e89_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_ce2fae74-be45-466a-a7a8-d9c5cb78aaeb_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_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives_fb0185e7-dfb7-44b6-969b-9d4d908e5564_negatedLabel_en" xlink:label="lab_ifrs-full_AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Adjustments for gains (losses) on change in fair value of derivatives</link:label>
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    <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>
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    <link:label id="lab_ptv_FinanceIncomeCostsSubsidiaryPreferredShares_label_en" xlink:label="lab_ptv_FinanceIncomeCostsSubsidiaryPreferredShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Finance income (costs) subsidiary preferred shares</link:label>
    <link:label id="lab_ptv_FinanceIncomeCostsSubsidiaryPreferredShares_documentation_en" xlink:label="lab_ptv_FinanceIncomeCostsSubsidiaryPreferredShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Finance income/(costs) - subsidiary preferred shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ptv_FinanceIncomeCostsSubsidiaryPreferredShares" xlink:href="213800LVPDNO2Z9T9I39-2021-12-31.xsd#ptv_FinanceIncomeCostsSubsidiaryPreferredShares"/>
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    <link:label id="lab_ptv_GainLossOnLossOfSignificantInfluence_label_en" xlink:label="lab_ptv_GainLossOnLossOfSignificantInfluence" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Gain/(Loss) on loss of significant influence</link:label>
    <link:label id="lab_ptv_GainLossOnLossOfSignificantInfluence_documentation_en" xlink:label="lab_ptv_GainLossOnLossOfSignificantInfluence" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Gain/(Loss) on loss of significant influence</link:label>
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    <link:label id="lab_ptv_AdjustmentOfImpairmentOfInvestmentInAssociate_documentation_en" xlink:label="lab_ptv_AdjustmentOfImpairmentOfInvestmentInAssociate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Adjustment of Impairment of investment in associate</link:label>
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    <link:label id="lab_ifrs-full_EquityAbstract_4d2423a1-9bfb-412d-aeef-aa2855e5fbc1_terseLabel_en" xlink:label="lab_ifrs-full_EquityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Equity</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAbstract" xlink:to="lab_ifrs-full_EquityAbstract" 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" 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_ifrs-full_CashFlowsFromUsedInInvestingActivities_c90ac16f-1e5e-4ff9-9141-7996aaefbff1_totalLabel_en" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Net cash provided by investing activities</link:label>
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    <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>
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    <link:label id="lab_ifrs-full_CurrentFinanceLeaseReceivables_512ffa59-2668-4149-83af-4b3775c347f7_verboseLabel_en" xlink:label="lab_ifrs-full_CurrentFinanceLeaseReceivables" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Current finance lease receivables</link:label>
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    <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" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en">Increase Decrease through vesting of share based awards and net share exercise, equity</link:label>
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