Kengrexal 50 mg powder for concentrate for solution for injection / infusion

Kengrexal, co-administered with acetylsalicylic acid (ASA), is indicated for the reduction of thrombotic cardiovascular events in adult patients with coronary artery disease undergoing percutaneous coronary intervention (PCI) who have not received an oral P2Y12 inhibitor prior to the PCI procedure and in whom oral therapy with P2Y12 inhibitors is not feasible or desirable.

Kengrexal should be administered by a physician experienced in either acute coronary care or in coronary intervention procedures and is intended for specialised use in an acute and hospital setting.

Posology

The recommended dose of Kengrexal for patients undergoing PCI is a 30 micrograms/kg intravenous bolus followed immediately by 4 micrograms/kg/min intravenous infusion. The bolus and infusion should be initiated prior to the procedure and continued for at least two hours or for the duration of the procedure, whichever is longer. At the discretion of the physician, the infusion may be continued for a total duration of four hours, see section 5.1.

Patients should be transitioned to oral P2Y12 therapy for chronic treatment. For transition, a loading dose of oral P2Y12 therapy (clopidogrel, prasugrel or ticagrelor) should be administered. as described below, see also section 4.5:

• Clopidogrel: immediately following discontinuation of cangrelor infusion.

• Prasugrel: immediately following discontinuation of cangrelor infusion. Alternatively, a loading dose of prasugrel may be administered up to 30 minutes before the end of the infusion.

• Ticagrelor: at any time during cangrelor infusion or immediately after discontinuation.

Use with other anticoagulant agents

In patients undergoing PCI, standard procedural adjunctive therapy should be implemented (see section 5.1).

Elderly

No dose adjustment is needed in elderly (≥75 years) patients.

Renal impairment

No dose adjustment is needed in patients with mild, moderate or severe renal insufficiency (see sections 4.4 and 5.2).

Hepatic impairment

No dose adjustment is needed (see section 5.2).

Paediatric population

The safety and efficacy of cangrelor in children aged less than 18 years has not yet been established. Currently available data are described in section 5.1 and 5.2 but no recommendation on a posology can be made.

Method of administration

Kengrexal is intended for intravenous use, only after reconstitution and dilution.

Kengrexal should be administered via an intravenous line. The bolus volume should be administered rapidly (<1 minute), from the diluted bag via manual intravenous push or pump. Ensure the bolus is completely administered before the start of PCI. Start the infusion immediately after administration of the bolus.

For instructions on reconstitution and dilution of the medicinal product before administration see section 6.6.

• Active bleeding or increased risk of bleeding, because of impaired haemostasis and/or irreversible coagulation disorders or due to recent major surgery/trauma or uncontrolled severe hypertension.

• Any history of stroke or transient ischaemic attack (TIA).

• Hypersensitivity to the active substance or to any of the excipients listed in section 6.1.

Risk of bleeding

Treatment with Kengrexal may increase the risk of bleeding.

In pivotal studies conducted in patients undergoing PCI, GUSTO (Global Use of Strategies to Open Occluded Arteries), moderate and mild bleeding events were more common in patients treated with cangrelor than in patients treated with clopidogrel, see section 4.8.

Although most bleeding associated with the use of cangrelor occurs at the site of arterial puncture, haemorrhage can occur at any site. Any unexplained fall in blood pressure or haematocrit should lead to the serious consideration of a haemorrhagic event and the cessation of cangrelor administration. Cangrelor should be used with caution in patients with disease states associated with an increased bleeding risk. Cangrelor should be used with caution in patients taking medicines that may increase the risk of bleeding.

Cangrelor has a half-life of three to six minutes. Platelet function is restored within 60 minutes of stopping infusion.

Intracranial haemorrhage

Treatment with Kengrexal may increase the risk of intracranial haemorrhage. In pivotal studies conducted in patients undergoing PCI, there were more intracranial bleeds at 30 days with cangrelor (0.07%) than with clopidogrel (0.02%), of which 4 bleeds with cangrelor and 1 bleed with clopidogrel were fatal. Cangrelor is contraindicated in patients with any history of stroke/TIA, (see sections 4.3 and 4.8).

Cardiac tamponade

Treatment with Kengrexal may increase the risk of cardiac tamponade. In pivotal studies conducted in patients undergoing PCI, there were more cardiac tamponades at 30 days with cangrelor (0.12%) than with clopidogrel (0.02%), (see section 4.8).

Effects on renal function

In pivotal studies conducted in patients undergoing PCI, events of acute renal failure (0.1%), renal failure (0.1%) and increased serum creatinine (0.2%) were reported to occur after administration of cangrelor in clinical trials (see section 4.8). In patients with severe renal impairment (creatinine clearance 15‑30 mL/min) a higher rate of worsening in renal function (3.2%) was reported in the cangrelor group compared to clopidogrel (1.4%). In addition, a higher rate of GUSTO moderate bleeding was reported in the cangrelor group (6.7%) compared to clopidogrel (1.4%). Cangrelor should be used with caution in these patients.

Hypersensitivity

Hypersensitivity reactions may occur after treatment with Kengrexal. A higher rate of serious cases of hypersensitivity were recorded with cangrelor (0.05%) than with control (0.007%). These included cases of anaphylactic reactions/shock and angioedema (see section 4.8).

Risk of dyspnoea

Treatment with Kengrexal may increase the risk of dyspnoea. In pivotal studies conducted in patients undergoing PCI dyspnoea (including exertional dyspnoea) occurred more commonly in patients treated with cangrelor (1.3%) than clopidogrel (0.4%). Most dyspnoea events were mild or moderate in severity and the median duration of dyspnoea was two hours in patients receiving cangrelor (see section 4.8).

Fructose intolerance

This medicinal product contains 52.2 mg sorbitol in each vial. Patients with hereditary fructose intolerance (HFI) must not be given this medicine unless strictly necessary.

Sodium

This medicinal product contains less than 1 mmol sodium (23 mg) per vial, that is to say essentially 'sodium-free'.

Interaction studies have only been performed in adults.

Oral P2Y12 agents (clopidogrel, prasugrel, ticagrelor)

When clopidogrel is administered during infusion of cangrelor, the expected inhibitory effect of clopidogrel on platelets is not achieved. Administration of 600 mg clopidogrel immediately after the cessation of the cangrelor infusion results in the anticipated full pharmacodynamic effect. No clinically relevant interruption of P2Y12 inhibition was observed in phase III studies when 600 mg clopidogrel was administered immediately after discontinuation of the cangrelor infusion.

A pharmacodynamic interaction study has been conducted with cangrelor and prasugrel, which demonstrated that cangrelor and prasugrel can be administered concomitantly. Patients can be transitioned from cangrelor to prasugrel when prasugrel is administered immediately following discontinuation of the cangrelor infusion or up to one hour before, optimally at 30 minutes before the end of the cangrelor infusion to limit recovery of platelet reactivity.

A pharmacodynamic interaction study has also been conducted with cangrelor and ticagrelor. No interaction on cangrelor was observed. Patients can be transitioned from cangrelor to ticagrelor without interruption of antiplatelet effect, see section 4.2..

Pharmacodynamic effects

Cangrelor exhibits inhibition of activation and aggregation of platelets as shown by aggregometry (light transmission and impedance), point-of care assays, such as the VerifyNow P2Y12 test, VASP-P and flow cytometry.

Following the administration of a 30 micrograms/kg bolus followed by a 4 micrograms/kg/min infusion (the PCI dose), platelet inhibition is observed within two minutes. The pharmacokinetic/pharmacodynamic (PK/PD) effect of cangrelor is maintained consistently for the duration of the infusion.

Irrespective of dose, following cessation of the infusion, cangrelor blood levels decrease rapidly and platelet function returns to normal within one hour.

Acetylsalicylic acid, heparin, nitrogycerin

No pharmacokinetic or pharmacodynamic interaction with cangrelor was observed in an interaction study with aspirin, heparin, or nitroglycerin.

Bivalirudin, low molecular weight heparin, fondaparinux, and GP IIb/IIIa inhibitors

In clinical studies, cangrelor has been co-administered with bivalirudin, low molecular weight heparin, fondaparinux, and GP IIb/IIIa inhibitors (abciximab, eptifibatide, tirofiban) with no apparent effect upon the pharmacokinetics or pharmacodynamics of cangrelor.

Cytochrome P450 (CYP)

Metabolism of cangrelor is not dependent on CYPs and CYP isoenzymes are not inhibited by therapeutic concentrations of cangrelor or its major metabolites.

Breast cancer resistance protein (BCRP)

In vitro inhibition of BCRP by the metabolite ARC-69712XX at clinically relevant concentrations has been observed. Possible implications for the in vivo situation have not been investigated, but caution is advised when cangrelor is to be combined with a BCRP substrate.

Pregnancy

There are no or limited amount of data from the use of Kengrexal in pregnant women. Studies in animals have shown reproductive toxicity (see section 5.3).

Kengrexal is not recommended during pregnancy.

Breast-feeding

It is unknown whether Kengrexal is excreted in human milk. A risk to the newborns/infants cannot be excluded.

Fertility

No effect on female fertility parameters were observed in animal studies of Kengrexal. A reversible effect on fertility was observed in male rats treated with Kengrexal (see section 5.3).

Kengrexal has no or negligible influence on the ability to drive and use machines.

Summary of the safety profile

The most common adverse reactions with cangrelor include mild and moderate bleeding and dyspnoea. Serious adverse reactions associated with cangrelor in patients with coronary artery disease include severe/life threatening bleeding and hypersensitivity.

Tabulated list of adverse reactions

Table 1 depicts adverse reactions that have been identified based upon a pooling of combined data from all CHAMPION studies. Adverse reactions are classified according to frequency and system organ class. Frequency categories are defined according to the following conventions: Very common (≥1/10), common (≥1/100 to <1/10), uncommon (≥1/1,000 to <1/100), rare (≥1/10,000 to <1/1,000), very rare (<1/10,000).

Table 1: Adverse reactions for cangrelor in CHAMPION pooled studies within 48 hours

Multiple related adverse reaction terms have been grouped together in the table and include medical terms as described below:

a. Upper gastrointestinal haemorrhage, mouth haemorrhage, gingival bleeding, oesophageal haemorrhage, duodenal ulcer haemorrhage, haematemesis, lower gastrointestinal haemorrhage, rectal haemorrhage, haemorrhoidal haemorrhage, haematochezia.

b. Application site bleeding, catheter site haemorrhage or haematoma, infusion site haemorrhage or haematoma.

c. Coagulation time abnormal, prothrombin time prolonged.

d. Cerebral haemorrhage, cerebrovascular accident.

e. Haematuria, blood urine present, urethral haemorrhage.

f. Erythema, rash erythematous, rash pruritic.

* Including events with fatal outcome.

** Transfusion was uncommon 101/12,565 (0.8%).

Description of selected adverse reactions

The GUSTO bleeding scale was measured in the CHAMPION (PHOENIX, PLATFORM, and PCI) clinical trials. An analysis of non‑coronary artery bypass grafting (CABG)‑related bleeding is presented in Table 2.

When administered in the PCI setting, cangrelor was associated with a greater incidence of GUSTO mild bleeding compared with clopidogrel. Further analysis of GUSTO mild bleeding revealed that a large proportion of mild bleeding events were ecchymosis, oozing and <5 cm haematoma. Transfusion and GUSTO severe/life-threatening bleeding rates were similar. In the pooled safety population from the CHAMPION trials, the incidence of fatal bleeding within 30 days of dosing was low and similar in patients who received cangrelor compared to clopidogrel (8 [0.1%] vs. 9 [0.1%]).

No baseline demographic factor altered the relative risk of bleeding with cangrelor.

Table 2: Non-CABG-related bleeding

CABG: Coronary Artery Bypass Graft Surgery; GUSTO: Global Use of Strategies to Open Coronary Arteries; w/o: without

^a In the CHAMPION pooled analysis, GUSTO Mild was defined as other bleed not requiring blood transfusion or causing haemodynamic compromise.

^b In CHAMPION PHOENIX, GUSTO Mild was defined as other bleeding requiring intervention but not requiring blood transfusion or causing haemodynamic compromise.

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via: Yellow Card Scheme Website: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.

In clinical studies, healthy volunteers received up to two times the proposed daily dose. In clinical trials, the maximum accidental overdose was 10 times (bolus) or 3.5 times the infusion dose normally administered and bleeding was the most frequently observed adverse event.

Bleeding is the most likely pharmacological effect of overdose. If bleeding occurs appropriate supportive measures should be taken, which may include stopping the medicinal product so platelet function can return.

There is no antidote to Kengrexal, however, the pharmacokinetic half-life of Kengrexal is three to six minutes. Platelet function is restored within 60 minutes of stopping the infusion.

Pharmacotherapeutic group: Platelet aggregation inhibitors excluding heparin, ATC code: B01AC25.

Mechanism of action

Kengrexal contains cangrelor, a direct P2Y12 platelet receptor antagonist that blocks adenosine diphosphate (ADP)-induced platelet activation and aggregation in vitro and ex vivo. Cangrelor binds selectively and reversibly to the P2Y12 receptor to prevent further signalling and platelet activation.

Pharmacodynamic effects

Cangrelor exhibits inhibition of activation and aggregation of platelets as shown by aggregometry (light transmission and impedance), point-of care assays, such as the VerifyNow P2Y12test, VASP-P and flow cytometry. Onset of P2Y12 inhibition occurs rapidly upon cangrelor administration.

Following the administration of a 30 microgram/kg bolus followed by a 4 microgram/kg/min infusion, platelet inhibition is observed within two minutes. The pharmacokinetic/pharmacodynamic (PK/PD) effect of cangrelor is maintained consistently for the duration of the infusion.

Irrespective of dose, following cessation of the infusion, blood levels decrease rapidly and platelet function returns to normal within one hour.

Clinical efficacy and safety

The primary clinical evidence for the efficacy of cangrelor is derived from CHAMPION PHOENIX, a randomised, double-blind study comparing cangrelor (n=5,472) to clopidogrel (n=5,470), both given in combination with aspirin and other standard therapy, including unfractionated heparin (78%), bivalirudin (23%), LMWH (14%) or fondaparinux (2.7%). The median duration of cangrelor infusion was 129 minutes. GP IIb/IIIa inhibitors were permitted for bailout use only and were used in 2.9% of patients. Patients with coronary atherosclerosis were included who required PCI for stable angina (58%), non-ST-segment elevation acute coronary syndrome (NSTE-ACS) (26%), or ST-elevation myocardial infraction (STEMI) (16%).

Data from the CHAMPION pooled population of over 25,000 PCI patients provide additional clinical support for safety.

In CHAMPION PHOENIX, cangrelor significantly reduced (relative risk reduction 22%; absolute risk reduction 1.2%) the primary composite endpoint of all-cause mortality, MI, IDR, and ST compared to clopidogrel at 48 hours (Table 3).

Table 3: Thrombotic events at 48 hours in CHAMPION PHOENIX (mITT population)

^a Primary endpoint from logistic regression adjusted for loading dose and patient status. p-values for secondary endpoints based on Chi-squared test.

OR = odds ratio; CI = confidence interval; IDR = ischaemia-driven revascularisation; MI = myocardial infarction; mITT = modified intent-to-treat; ST = stent thrombosis.

Significant reductions in death/MI/IDR/ST and ST observed in the cangrelor group at 48 hours were maintained at 30 days (Table 4).

Table 4: Thrombotic events at 30 days in CHAMPION PHOENIX (mITT population)

^a p-values based on Chi-squared test.

OR = odds ratio; CI = confidence interval; IDR = ischaemia-driven revascularisation; MI = myocardial infarction; mITT = modified intent-to-treat; ST = stent thrombosis.

Paediatric Population

The European Medicines Agency has deferred the obligation to submit the results of studies with Kengrexal in one or more subsets of the paediatric population in the prevention of non-site specific embolism and thrombosis, for the treatment of thrombosis in paediatric patients undergoing diagnostic and / or therapeutic percutaneous vascular procedures (see section 4.2 for information on paediatric use).

In a prospective, open-label, single-arm, multi-center, Phase I study, cangrelor was evaluated at 2 dose levels of 0.5 and 0.25 micrograms/kg/min in 15 neonates ≤28 days of life with congenital heart disease requiring palliation with a systemic-to-pulmonary artery shunt, a right ventricle-to-pulmonary artery shunt, or a ductus arteriosus stent (see section 4.2). Platelet aggregation inhibition was assessed by light transmission aggregometry (LTA) in response to stimulation with 20 and 5 µM ADP. The % inhibition of maximal aggregation 45 minutes into cangrelor infusion and the number of subjects who achieved >90% of maximal platelet aggregation inhibition are summarized in the table below.

Absorption

The bioavailability of cangrelor is complete and immediate. Cangrelor is rapidly distributed reaching C_max within two minutes after administration of an intravenous bolus followed by infusion. The mean steady state concentration of cangrelor during a constant intravenous infusion of 4 micrograms/kg/min is 488 ng/mL.

Distribution

Cangrelor has a volume of distribution of 3.9 L. Cangrelor is 97‑98% plasma-protein bound.

Biotransformation

Cangrelor is deactivated rapidly in the plasma by dephosphorylation to form its primary metabolite, a nucleoside. The metabolism of cangrelor is independent of organ function and does not interfere with other drugs metabolised by hepatic enzymes.

Elimination

The half-life of Kengrexal is three to six minutes, independent of dose. Following the intravenous administration of a 2 micrograms/kg/min infusion of [³H] cangrelor to healthy male volunteers, 93% of total radioactivity was recovered. Of the recovered material, 58% was found in urine and the remaining 35% was found in faeces, presumably following biliary excretion. Initial excretion was rapid, such that approximately 50% of the administered radioactivity was recovered in the first 24 hours, and 75% was recovered by 48 hours. Mean clearance was approximately 43.2 L/kg.

Linearity/non-linearity

The pharmacokinetic properties of cangrelor have been evaluated and found to be linear in patients and healthy volunteers.

Pharmacokinetic/pharmacodynamic relationship(s)

Special populations

The pharmacokinetics of cangrelor are not affected by gender, age, or renal or hepatic status. No dose adjustment is needed for these populations.

Paediatric population

Cangrelor infusion has been evaluated in neonatal patients (age from birth to 28 days) at a dose level of 0.25 and 0.5 micrograms/kg/min. The maximum concentrations were 19 ng/mL and 60 ng/mL, respectively, and were observed approximately 45 minutes following start of infusion. In neonates, cangrelor is rapidly metabolised into its primary metabolite AR-C69712XX. Very low or non-detectable levels of cangrelor were found 5-10 minutes post-infusion and relatively high levels of the primary metabolite were detected.

Non-clinical data reveal no special safety risk for humans based on studies of safety pharmacology, mutagenicity and clastogenic potential.

Carcinogenicity studies have not been performed.

The primary adverse effects of cangrelor in rats and dogs occurred in the upper urinary tract and consisted of injury to renal tubules, renal pelvis, and ureter. Anatomical changes correlated with increased plasma creatinine and urea, and increased albumin and blood cells in urine. Injury to the urinary tract was reversible following cessation of dosing in an investigative study in rats.

Reproductive toxicity

Cangrelor produced dose-related foetal growth retardation characterised by increased incidences of incomplete ossification and unossified hind limb metatarsals in rats. In rabbits, cangrelor was associated with increased incidences of abortion and intrauterine losses, as well as foetal growth retardation at higher doses which may have been secondary to maternal toxicity. Cangrelor did not produce malformations in either the rat or rabbit reproductive studies.

Impairment of fertility

Effects on fertility, ability to produce a pregnancy with female partner(s), sperm morphology and sperm motility were observed in the male rat fertility study when cangrelor was administered at human equivalent doses equal to 1.8 fold the recommended PCI dose. These effects were not apparent at lower doses and were reversible following cessation of dosing. In this study, semen analysis was conducted after 8 weeks of continuous treatment.

Female fertility was not affected at any dose.

Mannitol

Sorbitol

Sodium hydroxide (for pH-adjustment)

In the absence of compatibility studies, this medicinal product must not be mixed with other medicinal products.

3 years.

The powder should be reconstituted immediately prior to dilution and use. Do not refrigerate.

From a microbiological point of view, unless the method of reconstitution/dilution precludes the risk of microbiological contamination, the product should be used immediately. If not used immediately, in-use storage times and conditions prior to use are the responsibility of the user.

This medicinal product does not require any special storage conditions. For storage conditions after reconstitution and dilution of the medicinal product, see section 6.3.

Powder in 10 mL glass vials (Type 1) closed with a Flurotec coated butyl rubber stopper and sealed with crimped aluminium seal.

Kengrexal is available in packs of 10 vials.

Instructions for preparation

Aseptic procedures should be used for the preparation of Kengrexal.

The vial should be reconsituted immediately prior to dilution and use. Reconstitute each 50 mg/vial by adding 5 mL of sterile water for injection. Swirl gently until all material is dissolved. Avoid vigorous mixing. Allow any foam to settle. Ensure that the contents of the vial are fully dissolved and the reconstituted material is a clear, colourless to pale yellow solution.

Do not use without dilution. Before administration, 5 mL reconstituted solution has to be withdrawn from each vial and must be diluted further with 250 mL sodium chloride 9 mg/mL (0.9%) solution for injection or glucose (5%) solution for injection. Mix the bag thoroughly.

The medicinal product should be inspected visually for particulate matter after reconstitution.

Kengrexal is administered as a weight-based regimen consisting of an initial intravenous bolus followed by an intravenous infusion. The bolus and infusion should be administered from the infusion solution.

This dilution will generate a concentration of 200 micrograms/mL and should be sufficient for at least two hours of dosing as required. Patients 100 kg and over will require a minimum of two bags.

Disposal

Any unused medicinal product or waste material should be disposed of in accordance with local requirements.