Clinical trial NCT02301910: Single Bolus Recombinant Nonimmunogenic Staphylokinase Versus Single Bolus Tenecteplase (Metalyse) in STEMI
Official title: Multicenter Open Lable Randomized Comparative Study of Efficacy and Safety of Single Bolus Injection of Recombinant Nonimmunogenic Staphylokinase (Fortelyzin) and Tenecteplase (Metalyse) in STEMI Patients
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE3
Conditions: Myocardial Infarction
Keywords: Myocardial Infarction
Fibrinolysis
Fortelyzin
Lead sponsor: Supergene, LLC
Sponsor class: INDUSTRY
First posted: 2014-11-26
Enrollment: 382
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: The aim of the study is to determine if single-bolus recombinant nonimmunogenic staphylokinase is effective and save thrombolytic agent in patients presenting ST-segment elevation myocardial infarction in comparison to tenecteplase.

Detailed description: Experimental Drug Profile. The active substance of Fortelyzin is Forteplase. It's recombinant protein which contains aminoacid sequence of staphylokinase. It is single chain molecula, consists of 138 aminoacids, weight 15.5 kDa. When staphylokinase is added to human plasma containing a fibrin clot, it preferentially reacts with plasmin at the clot surface, forming a plasmin-staphylokinase complex. This complex activates plasminogen trapped in the thrombus. The plasmin-staphylokinase complex and plasmin bound to fibrin are protected from inhibition by alpha2-antiplasmin. Once liberated from the clot (or generated in plasma), however, they are rapidly inhibited by alpha2-antiplasmin. This selectivity of action confines the process of plasminogen activation to the thrombus, preventing excessive plasmin generation, alpha2-antiplasmin depletion, and fibrinogen degradation in plasma. In rabbits anti forteplase antibodies are not produced. It was achieved by replacement of amino acids in immunogenic epitop of molecule staphylokinase. Blood fibrinogen decrease after i.v. injection of Fortelyzin less 10% within first 24 hours. Angiographic data suggests that restoration of coronary blood flow appears in up to 80% of patients with STEMI after i.v. injection of Fortelyzin.

Risk/benifit for trail participants. Expected benefit is normalisation of blood supply of ischemic myocardium. It will allow to preserve normal heart function and avoid heart failure development. The most frequent advers reactions of Fortelyzin are possibilty of bleeding. It is possible occurence of internal bleeding due to peptic ulcer, erosion of the esophagus, haemorrhoid, veins of esophagus and so on. Thorough collection of patients data and following the drug instruction allows to dicrease risk of bleeding. The benefit of using fibrinolytics for patients with STEMI is supposed to be higher then risk of bleeding. The reperfusion arrhythmias may occur so the careful ECG monitiring is required.

Main goals of the study

* to prove an efficacy of the single-bolus intravenous injection of recombinant nonimmunogenic staphylokinase (Fortelyzin) in comparison with single-bolus tenecteplase (Metalyse) in patients with ST-segment elevation myocardial infarction
* to prove a safety and to assess possible adverse events in the single-bolus intravenous injection of recombinant nonimmunogenic staphylokinase (Fortelyzin) in comparison with single-bolus tenecteplase (Metalyse) in patients with ST-segment elevation myocardial infarction

Study Design. All eligible patients will be randomized in two equal groups for administration recombinant nonimmunogenic staphylokinase (Fortelyzin) or tenecteplase (Metalyse) by using "envelope method" of randomization. It is an open-lable study. Each of agents will be administered no longer then 12 hours from symptoms onset. Experimental and comparative agent will be administered as prescribed in its instructions.

All randomized patients will receive double anti-platelet therapy and anticoagulant therapy:

Enoxaparin \< 75 years:

* 30 mg intravenous bolus
* Subcutaneous injections of 1.0 mg/kg every 12 hours until hospital discharge or for a maximum of 4 days; the first injection should be given within 15 min of the bolus
* For the first two subcutaneous injections, a maximum of 100 mg per injection should not be exceeded

  ≥ 75 years:
* No bolus; Subcutaneous injections of 0.75 mg/kg every 12 hours until hospital discharge or for a maximum of 4 days; the first injection should be given immediately.
* For the first two subcutaneous injections, a maximum of 75 mg per injection should not be exceeded.

For patients of any age with a creatinine clearance \< 30 ml/min, subcutaneous injections of 1.0 mg/kg will be given in intervals of 24 hours.

Clopidogrel \< 75 years: - 300 mg per os loading dose

* 75 mg per os once daily as maintenance dose

  ≥ 75 years: - No loading dose; 75 mg per os immediately after randomization
* 75 mg per os once daily (maintenance dose)

Acetylsalicylic acid is expected to be administered routinely to all patients at a dose of 250 mg per os before fibrinolysis and then 75 - 325 mg per os once daily.

Patients who received enoxaparin in the pre-hospital setting should not be administered a different type of heparin prior to catheterisation (and vice versa). If heparin was used in the pre-hospital setting or early in-hospital period, subsequent treatment should not be switched to enoxaparin prior to catheterisation. Prior to catheterisation a dose of 0.3 mg/kg intravenous enoxaparin should be given to patients unless the last subcutaneous dose of enoxaparin was given within the previous 8 hrs.

Catheterisation

* If ST-segment resolution is ≥ 50 % in the qualifying lead (that had the maximum initial ST-segment elevation in the baseline ECG) in 90 min, diagnostic coronary angiography (followed by PCI +/- stenting, if indicated) should be performed within 3-24 hours after administration of fibrinolytic agent. This will be considered as planned catheterisation according to protocol
* If ST-segment resolution is \< 50 % relative to the ST-segment elevation in the qualifying lead at baseline, irrespective of the presence or absence of clinical symptoms, rescue coronary intervention should be performed promptly.
* If any of the following indications require coronary intervention (irrespective of previous ST-segment resolution), urgent coronary intervention is indicated at any time:

  * haemodynamic instability (presence of any of the following requiring inotropic support: sustained hypotension, cardiogenic shock, or congestive heart failure)
  * refractory ventricular arrhythmias requiring cardioversion or pharmacological treatment
  * worsening ischaemia
  * progressive or sustained ST-segment elevation which, in the judgement of the investigator, requires immediate coronary intervention.

Duration of follow-up will be 30 days since randomization

Observation plan There are six visits in clinical trail schedule.

First. In admission to the clinical center but no longer then 12 hour of symptoms onset:

* if the patient meet inclusion criteria and does not meet exclusion criteria the patient informed consent will be sign according to the protocol
* evaluation of medical history and physical examination
* 12-lead ECG - confirmation of STEMI
* blood analysis (include troponin, CK-MB, INR, APPT, fibrinogen)
* urine analisis
* correction of therapy (double anti-platelet therapy, enoxaparin)
* randomization
* intravenous injection of Fortelyzin or Metalyse according to instruction
* ECG criteria of reperfusion assessment (90 min)
* PCI within 3-24 hours after fibrinolysis

Second (24 hours), Third (72 hours), Fourth (7 days), Fifth (14 days or discharge)

* physical examination
* 12-lead ECG
* blood analysis (include troponin, CK-MB, INR, APPT, fibrinogen)
* urine analysis
* correction of the therapy if nececcary
* monitoring of adverse events and bleeding

Sixth (30 day)

* monitoring of adverse events and bleeding
* assessment of end points

Adverse events (AE). All serious AEs related to study treatment (recombinant nonimmunogenic staphylokinase, tenecteplase, enoxaparin, acetylsalicylic acid, clopidogrel, catheterisation/PCI) will be reported on the serious adverse events (SAE) page as well as on the AE page of the CRF. All SAE neither related to any study treatment nor on the 'list of STEMI related events' will be reported on the SAE page as well as on the AE page of the CRF. All other SAEs not related to any study treatment, but on the 'list of STEMI-related events' will only be recorded on the AE page of the CRF. Only serious AEs (SAEs) and serious/non-serious bleeds will be recorded in the CRF. Non-serious AEs other than bleeds will not be recorded in the CRF.

Detailed instructions - including a flow chart - on the reporting of adverse events will be provided in the Investigator Site File (ISF). During screening/baseline, the patient's condition is assessed; any relevant changes from baseline will be noted subsequently in the source data. Patients and investigators will be required - according to the procedure described above - to report spontaneously any SAEs and bleeds as well as the time of onset, end and intensity of these events. A carefully written record of all SAEs and bleeds will be kept by the investigator in charge of the trial. Records must include data on the time of onset, end time and intensity of the event as well as any treatment or action required for the event and its outcome. All events, including those persisting after trial completion must be followed up until they have resolved or have been sufficiently characterised.

Worsening of pre-existing conditions

* Expected fluctuations or expected deterioration of the underlying disease will not be recorded as an AE. Worsening of the disease under study will be recorded as an AE if one of the following criteria is met.

  * Worsening of disease meets the criteria for an SAE.
  * Action is taken with investigational drug, i.e. dose is reduced or treatment discontinued or increased.
  * Treatment is required (concomitant medication is added or changed).
  * The investigator believes a patient has shown a clear, unexpected deterioration from baseline symptoms.
* The same criteria as above apply to recording of AEs resulting from worsening of other pre-existing conditions. Pre-existing conditions are not recorded as AEs if they do not meet the criteria above. Specifically, the following will not be recorded as an AE:

  * Pre-existing conditions present at baseline, which remain unchanged during the trial.
  * Expected fluctuations or expected deterioration of a pre-existing condition.

Vital Signs, ECG and Laboratory test results qualifying as AE Changes in safety tests including blood pressure, pulse rate, ECG and laboratory tests will be recorded as AEs, if:

* they are not associated with an already reported AE, symptom or diagnosis and
* action is taken with the investigational drug, i.e. dose is reduced or treatment discontinued or
* treatment is required (concomitant medication is added or changed) An AE is defined as any untoward medical occurrence, including an exacerbation of a pre-existing condition, in a patient in a clinical investigation who received a pharmaceutical product. The event does not necessarily have to have a causal relationship with this treatment. All adverse events occurring during the course of the clinical trial (i.e., from signing the informed consent onwards through the observational phase) will be collected, documented and reported to the sponsor by the investigator. A SAE is defined as any AE which results in death, is immediately life-threatening, results in persistent or significant disability / incapacity, requires or prolongs patient hospitalisation, is a congenital anomaly / birth defect, or is to be deemed serious for any other reason representing a significant hazard, which is comparable to the aforementioned criteria. All serious adverse events and non-serious bleeds will be fully documented in the appropriate CRFs. For each adverse event, the investigator will provide the onset, end, intensity, treatment required, outcome, seriousness and action taken with the investigational drug. The investigator will determine the relationship of the investigational drug to all AE as defined in the 'Adverse Event Reporting' section of the Investigator Site File. The basis for judging the intensity of the AE as well as the causal relationship between the investigational product and the AE is described below. Intensity of event

  * Mild: Awareness of sign(s) or symptom(s) which is/are easily tolerated
  * Moderate: Enough discomfort to cause interference with usual activity
  * Severe: Incapacitating or causing inability to work or to perform usual activities

Eligibility criteria: Inclusion Criteria:

* both gender patients over 18 years
* 12-lead ECG indicative of an STEMI (ST-segment elevation in acute myocardial infarction, measured at the J point, should be found in two contiguous leads and be ≥0.25 mV in men below the age of 40 years, ≥0.2 mV in men over the age of 40 years, or ≥0.15 mV in women in leads V2-V3 and/or ≥0.1 mV in other leads (in the absence of left ventricular hypertrophy or left bundle branch block
* the possibility of fibrinolysis within 12 hour of symptom onset
* inability of primary PCI within 60 min of first medical contact (FMC)
* informed consent received

Exclusion Criteria:

* expected performance of PCI less 60 min from FMC
* left bundle branch block or ventricular pacing
* cases of sinus bradycardia associated with hypotension, AV block II (Mobitz 2) or AV block III with bradycardia that causes hypotension or heart failure
* active bleeding or known bleeding disorders/diathesis
* uncontrolled hypertension, defined us single blood pressure measurement ≥180/110 mm Hg prior to randomization
* internal bleeding within the past 2 weeks
* conditions with increased risk of bleeding (peptic ulceration)
* prolonged or traumatic resuscitation within the past 2 weeks
* any known history of hemorrhagic stroke, or transitory ischemic attack
* ischemic stroke within the past 3 month
* puncture of unpressable vessels
* aortic aneurism
* intracranial neoplasm
* any head trauma within past 2 weeks
* intracranial vessel malformation
* recent administration of anticoagulant within the past month
* INR \>1.3
* sensibilisation to staphylokinase
* contra-indications to acetylsalicilic acid, clopidogrel, enoxaparin
* any conditions with unfavorable prognosis
* in case of surgical treatment required within 30 days after randomization
* in case of unhallowed medications required
* pregnancy, lactation
* inability to follow the protocol

Primary outcomes:
measure: The Number of Participants With Reperfusion
timeFrame: 90 min after fibrinolysis
Secondary outcomes:
measure: Composite Endpoint
timeFrame: within 30 days after fibrinolysis
measure: Cardiovascular Death
timeFrame: within 30 days after fibrinolysis
measure: Repeated Target Vessel Revascularization
timeFrame: within 30 days after fibrinolysis
measure: Development of Heart Failure
timeFrame: within 30 days after fibrinolysis
measure: Rehospitalization Due to Cardiovascular Reasons
timeFrame: within 30 days after fibrinolysis
measure: Overall Bleeding
timeFrame: within 30 gays after fibrinolysis
measure: Intracranial Haemorrhages
timeFrame: within 30 days after fibrinolysis
Other outcomes:
Locations:
city: Tomsk
country: Russian Federation
facility: Institute of Cardiology
state: Siberia
city: Belgorod
country: Russian Federation
facility: St. Iosaf's Belgorod Regional Clinical Hospital
city: Kemerovo
country: Russian Federation
facility: Kemerovo cardiological dispensary
city: Kemerovo
country: Russian Federation
facility: Research Institute of Complex Problems of Cardiovascular diseases
city: Kemerovo
country: Russian Federation
facility: City Clinical Hospital #11
city: Moscow
country: Russian Federation
facility: Russian national research medical University named after Pirogov
city: Moscow
country: Russian Federation
facility: City Clinical Hospital #81
city: Moscow
country: Russian Federation
facility: The Sklifosovsky Research institute of Emergency
city: Murmansk
country: Russian Federation
facility: Murmansk Regional Clinical Hospital
city: Nizhniy Novgorod
country: Russian Federation
facility: City Clinical Hospital #5
city: Ryazan
country: Russian Federation
facility: Regional Clinical Hospital
city: Samara
country: Russian Federation
facility: Samara Regional Clinical Cardiological Dispansery
city: St.-Petersburg
country: Russian Federation
facility: Mariinsk City Hospital
city: St.-Petersburg
country: Russian Federation
facility: Leningrad Regional Clinical Hospital
city: Tver
country: Russian Federation
facility: Regional Clinical Hospital
city: Vladimir
country: Russian Federation
facility: Citi Clinical Hospital # 4
city: Volgograd
country: Russian Federation
facility: City Clinical Hospital of Emergency #25
Study officials:
affiliation: Institute of Cardiology, Tomsk, Russia
name: Valentin A. Markov, MD, Prof.
role: PRINCIPAL_INVESTIGATOR
affiliation: Supergene LCC
name: Segey S Markin, MD, Prof.
role: STUDY_DIRECTOR
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citation: Assessment of the Safety and Efficacy of a New Thrombolytic Regimen (ASSENT)-3 Investigators. Efficacy and safety of tenecteplase in combination with enoxaparin, abciximab, or unfractionated heparin: the ASSENT-3 randomised trial in acute myocardial infarction. Lancet. 2001 Aug 25;358(9282):605-13. doi: 10.1016/S0140-6736(01)05775-0.
citation: Wallentin L, Goldstein P, Armstrong PW, Granger CB, Adgey AA, Arntz HR, Bogaerts K, Danays T, Lindahl B, Makijarvi M, Verheugt F, Van de Werf F. Efficacy and safety of tenecteplase in combination with the low-molecular-weight heparin enoxaparin or unfractionated heparin in the prehospital setting: the Assessment of the Safety and Efficacy of a New Thrombolytic Regimen (ASSENT)-3 PLUS randomized trial in acute myocardial infarction. Circulation. 2003 Jul 15;108(2):135-42. doi: 10.1161/01.CIR.0000081659.72985.A8. Epub 2003 Jul 7.
citation: Vanderschueren S, Dens J, Kerdsinchai P, Desmet W, Vrolix M, De Man F, Van den Heuvel P, Hermans L, Collen D, Van de Werf F. Randomized coronary patency trial of double-bolus recombinant staphylokinase versus front-loaded alteplase in acute myocardial infarction. Am Heart J. 1997 Aug;134(2 Pt 1):213-9. doi: 10.1016/s0002-8703(97)70127-3.
citation: Verstraete M. Third-generation thrombolytic drugs. Am J Med. 2000 Jul;109(1):52-8. doi: 10.1016/s0002-9343(00)00380-6.
citation: Collaborative Research Group of Reperfusion Therapy in Acute Myocardial Infarction. [A randomized multicenter trial comparing recombinant staphylokinase with recombinant tissue-type plasminogen activator in patients with acute myocardial infarction]. Zhonghua Xin Xue Guan Bing Za Zhi. 2007 Aug;35(8):691-6. Chinese.
citation: Collen D. Staphylokinase: a potent, uniquely fibrin-selective thrombolytic agent. Nat Med. 1998 Mar;4(3):279-84. doi: 10.1038/nm0398-279. No abstract available.