Vyxeos

Vyxeos liposomal is indicated for the treatment of adults with newly diagnosed, therapy-related acute myeloid leukaemia (t-AML) or AML with myelodysplasia-related changes (AML-MRC).

Vyxeos liposomal treatment should be initiated and monitored under the supervision of a physician experienced in the use of chemotherapeutic medicinal products.

Vyxeos liposomal has a different posology than daunorubicin injection and cytarabine injection and it must not be interchanged with other daunorubicin and/or cytarabine containing products (see section 4.4).

Posology

Vyxeos liposomal dosing is based on the patient's body surface area (BSA) according to the following schedule:

Table 1: Dose and schedule for Vyxeos liposomal

Recommended dosing schedule for induction of remission

The recommended dosing schedule of Vyxeos liposomal 44 mg/100 mg/m², administered intravenously over 90 minutes:

• on days 1, 3, and 5 as the first course of induction therapy.

• on days 1 and 3 as subsequent course of induction therapy, if needed.

A subsequent course of induction may be administered in patients who do not show disease progression or unacceptable toxicity. The attainment of a normal-appearing bone marrow may require more than one induction course. Evaluation of the bone marrow following recovery from the previous course of induction therapy determines whether a further course of induction is required. Treatment should be continued as long as the patient continues to benefit or until disease progression up to maximum of 2 induction courses.

Recommended dosing schedule for consolidation

The first consolidation cycle should be administered 5 to 8 weeks after the start of the last induction.

The recommended dosing schedule of Vyxeos liposomal is 29 mg/65 mg/m², administered intravenously over 90 minutes:

• on days 1 and 3 as subsequent courses of consolidation therapy, if needed.

Consolidation therapy is recommended for patients achieving remission who have recovered to absolute neutrophil count (ANC) > 500/µ L and the platelet count has recovered to greater than 50,000/µ L in the absence of unacceptable toxicity. A subsequent course of consolidation may be administered in patients who do not show disease progression or unacceptable toxicity within the range of 5 to 8 weeks after the start of the first consolidation. Treatment should be continued as long as the patient continues to benefit or until disease progression, up to maximum of 2 consolidation courses.

Recommended dose adjustments during treatment

Patients should be monitored for haematologic response and toxicities.

Dosing should be delayed or permanently discontinued, if necessary, as described below.

Patients may be pre-medicated for nausea and vomiting. An anti-hyperuricemic therapy should be considered (e.g., allopurinol) prior to initiating Vyxeos liposomal.

Hypersensitivity

For mild hypersensitivity symptoms (e.g., mild flushing, rash, pruritus), the treatment should be stopped, and the patient should be supervised, including monitoring of vital signs. The treatment should be restarted slowly once the symptoms have resolved, by halving the rate of infusion and intravenous diphenhydramine (20-25 mg) and intravenous dexamethasone (10 mg) should be given.

For moderate hypersensitivity symptoms (e.g., moderate rash, flushing, mild dyspnoea, chest discomfort) the treatment should be stopped. Intravenous diphenhydramine (20-25 mg or equivalent) and intravenous dexamethasone (10 mg) should be given. The infusion should not be restarted. When the patient is retreated, Vyxeos liposomal should be given at the same dose and rate and with premedication.

For severe/life-threatening hypersensitivity symptoms (e.g., hypotension requiring vasopressor therapy, angioedema, respiratory distress requiring bronchodilation therapy, generalised urticaria), the treatment should be stopped. Intravenous diphenhydramine (20-25 mg) and dexamethasone (10 mg) should be given, and an epinephrine (adrenaline) or bronchodilators should be added if indicated. Do not reinitiate infusion, and do not retreat. Treatment with Vyxeos liposomal should be permanently discontinued. Patients should be monitored until symptoms resolve (see sections 4.4 and 4.8).

Missed dose

If a planned dose of Vyxeos liposomal is missed, the dose should be administered as soon as possible and the dosing schedule adjusted accordingly, maintaining the treatment interval.

Cardiotoxicity

Assessment of cardiac function prior to start of treatment is recommended, especially in patients with a high risk of cardiac toxicity. Vyxeos liposomal treatment should be discontinued in patients who develop signs or symptoms of cardiomyopathy, unless the benefits outweigh the risks (see section 4.4).

Special populations

Renal impairment

Dose adjustment is not required for patients with mild (creatinine clearance [CrCL] 60 mL/min to 89 mL/min by Cockcroft Gault equation [C-G]), moderate (CrCL 30 mL/min to 59 mL/min) or severe (CrCL<30 mL/min) renal impairment. There is no experience with Vyxeos liposomal in patients with end-stage renal disease managed with dialysis. (see sections 5.2).

Hepatic impairment

Dose adjustment is not required for patients with a bilirubin level less than or equal to 50 µ mol/L. There is no experience with Vyxeos liposomal in patients with hepatic impairment resulting in a bilirubin level greater than 50 µ mol/L. Vyxeos liposomal should only be used in patients with severe hepatic impairment if the benefits outweigh the risks (see section 4.4).

Elderly population

No dose adjustment is required in elderly patients (≥ 65 years) (see section 5.2).

Paediatric population

Outside its authorised indications Vyxeos liposomal has been studied in paediatric and young adult patients aged 1-21 years with relapsed AML. Due to the limited size of these trials, it is not possible to conclude that the benefits of the use outweigh the risks.

Currently available data are described in sections 5.1 and 5.2, but no recommendation on a posology can be made.

Method of administration

Vyxeos liposomal is for intravenous use only. It must not be administered via an intramuscular, intrathecal, or subcutaneous route.

Vyxeos liposomal is administered by intravenous infusion over a period of 90 minutes. Care should be taken to ensure there is no extravasation to prevent the risk of tissue necrosis.

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

History of serious hypersensitivity to the active substances or to any of the excipients listed in section 6.1

Other daunorubicin and/or cytarabine-containing products

Vyxeos liposomal must not be substituted or interchanged with other daunorubicin and/or cytarabine containing products. Due to substantial differences in the pharmacokinetic parameters, the dose and schedule recommendations for Vyxeos liposomal are different from those for daunorubicin hydrochloride injection, cytarabine injection, daunorubicin citrate liposome injection, and cytarabine liposome injection. The medicinal product name and dose should be verified prior to administration to avoid dosing errors.

Severe myelosuppression

Severe myelosuppression (including fatal infections and haemorrhagic events) has been reported in patients after administration of a therapeutic dose of Vyxeos liposomal. Serious or fatal haemorrhagic events, including fatal central nervous system (CNS) haemorrhages, associated with severe thrombocytopenia, have occurred in patients treated with Vyxeos liposomal. Baseline assessment of blood counts should be obtained, and patients should be carefully monitored during treatment with Vyxeos liposomal for possible clinical complications due to myelosuppression. Due to the long plasma half-life of Vyxeos liposomal, time to recovery of ANC and platelets may be prolonged and require additional monitoring.

Prophylactic anti-infectives (including anti-bacterial, anti-virals, anti-fungals) may be administered during the period of profound neutropenia until ANC returns to 500/μ L or greater. If myelosuppressive complications occur, appropriate supportive measures should be used, e.g., anti-infectives, colony-stimulating factors, transfusions. Blood counts should be regularly monitored until recovery (see section 4.8).

Cardiotoxicity

Cardiotoxicity is a known risk of anthracycline treatment. Prior therapy with anthracyclines (including patients who have previously received the recommended maximum cumulative doses of doxorubicin or daunorubicin hydrochloride), pre-existing cardiac disease (including impaired cardiac function), previous radiotherapy of the mediastinum, or concomitant use of cardiotoxic products may increase the risk of daunorubicin-induced cardiac toxicity.

In two single arm studies of 65 anthracycline pre-treated children with relapsed or refractory AML treated with a single induction cycle (Cycle 1) of Vyxeos liposomal, cardiac disorders (including sinus tachycardia, QT prolongation and ejection fraction decreased) were observed. Several other long-term studies of treatment with anthracycline/ anthracenedione in children suggest that congestive cardiomyopathies with a latency of many years may occur (see section 4.8)

Total cumulative doses of non-liposomal daunorubicin greater than 550 mg/m² have been associated with an increased incidence of treatment-induced congestive heart failure. This limit appears lower (400 mg/m²) in patients who received radiation therapy to the mediastinum. The relationship between cumulative Vyxeos liposomal dose and the risk of cardiac toxicity has not been determined. Total cumulative exposure of daunorubicin has been described in the table below.

Table 2: Cumulative exposure of daunorubicin per course of Vyxeos liposomal

A baseline cardiac evaluation with an electrocardiogram (ECG) and a multi-gated radionuclide angiography (MUGA) scan or an echocardiography (ECHO) is recommended, especially in patients with risk factors for increased cardiac toxicity. Cardiac function should be closely monitored.

Treatment with Vyxeos liposomal should be discontinued in patients with impaired cardiac function unless the benefit of initiating or continuing treatment outweighs the risk (see sections 4.5 and 4.8).

Pregnancy warning/women of childbearing potential

Patients should be advised to avoid becoming pregnant while receiving Vyxeos liposomal. Male patients and women of childbearing potential must use an effective method of contraception during treatment and for 6 months following the last dose of Vyxeos liposomal (see section 4.6).

Hypersensitivity reactions

Serious hypersensitivity reactions, including anaphylactic reactions, have been reported with daunorubicin and cytarabine.

For moderate hypersensitivity symptoms (e.g., moderate rash, flushing, mild dyspnoea, chest discomfort) the treatment should be stopped. Intravenous diphenhydramine (20-25 mg or equivalent) and intravenous dexamethasone (10 mg) should be given. The infusion should not be restarted. When the patient is retreated, Vyxeos liposomal should be given at the same dose and rate and with premedication.

For severe/life-threatening hypersensitivity symptoms (e.g., hypotension requiring vasopressor therapy, angioedema, respiratory distress requiring bronchodilation therapy, generalised urticaria), the treatment should be stopped. Intravenous diphenhydramine (20-25 mg) and dexamethasone (10 mg) should be given, and an epinephrine (adrenaline) or bronchodilators should be added if indicated. Do not reinitiate infusion, and do not retreat. Treatment with Vyxeos liposomal should be permanently discontinued. Patients should be monitored until symptoms resolve (see sections 4.2 and 4.8).

Tissue necrosis

Daunorubicin has been associated with local tissue necrosis at the site of medicinal product extravasation. In clinical studies with Vyxeos liposomal, one event of extravasation occurred, but no necrosis was observed. Care should be taken to ensure that there is no extravasation of medicinal product when Vyxeos liposomal is administered. Vyxeos liposomal should be administered intravenously only. Do not administer via an intramuscular, intrathecal, or subcutaneous route (see section 4.2).

Evaluation of hepatic and renal function

Hepatic impairment may increase the risk of toxicity associated with daunorubicin and cytarabine. Evaluation of hepatic function using conventional clinical laboratory tests is recommended prior to administration of Vyxeos liposomal and periodically during treatment. There is no experience with Vyxeos liposomal in patients with baseline serum bilirubin greater than 50 µ mol/L, or end stage renal disease managed with dialysis. Vyxeos liposomal should only be used in patients with severe hepatic impairment if the benefits outweigh the risks (see section 4.2).

Laboratory tests

Vyxeos liposomal may induce hyperuricemia secondary to rapid lysis of leukaemic cells. Blood uric acid levels should be monitored and appropriate therapy initiated in the event that hyperuricemia develops.

History of Wilson's disease or other copper-related disorder

Each vial contains 100 mg of copper gluconate, which corresponds to 14 mg of elemental copper. Vyxeos liposomal should only be used in patients with a history of Wilson's disease or other copper-related disorder if the benefits outweigh the risks (see section 6.1). Discontinue Vyxeos liposomal in patients with signs or symptoms of acute copper toxicity.

Immunosuppressant effects/Increased susceptibility to infections

Administration of live or live-attenuated vaccines in patients that are immunocompromised by chemotherapeutic agents may result in serious or fatal infections. Vaccination with a live vaccine should be avoided in patients receiving Vyxeos liposomal. Killed or inactivated vaccines may be administered; however, the response to such vaccines may be diminished.

Gastrointestinal mucositis and diarrhoea

It should be taken into consideration that the absorption of oral accompanying medicinal products may be considerably influenced by gastrointestinal mucositis and/or diarrhoea frequently occurring in association with intensive chemotherapy.

No interaction studies have been performed with Vyxeos liposomal. The delivery of daunorubicin and cytarabine in the Vyxeos liposomal formulation is anticipated to reduce the possibility of interactions, because systemic free concentrations of daunorubicin and cytarabine are much lower than when administered as the non-liposomal formulation.

Cardiotoxic agents

Concurrent use of cardiotoxic agents may increase the risk of cardiotoxicity. Use of Vyxeos liposomal in patients who have previously received doxorubicin increases the risk of cardiotoxicity (see section 4.4). Do not administer Vyxeos liposomal in combination with other cardiotoxic agents unless the patient's cardiac function is closely monitored.

Hepatotoxic agents

Hepatotoxic medicinal products may impair liver function and increase the toxicity. Since daunorubicin is metabolised by the liver, changes in hepatic function induced by concomitant therapies may affect metabolism, pharmacokinetics, therapeutic efficacy, and/or the toxicity of Vyxeos liposomal (see section 5.2). Hepatic function should be monitored more frequently when Vyxeos liposomal is coadministered with hepatoxic agents.

Women of childbearing potential/Contraception in males and females

Women of childbearing potential should avoid becoming pregnant while receiving Vyxeos liposomal. Women of childbearing potential should use effective contraception while they or their male partner undergo treatment. Women of childbearing potential should not receive treatment until pregnancy is excluded.

Women of childbearing potential should undergo pregnancy testing before initiation of Vyxeos liposomal. Men with sexual partners of reproductive potential and women should use effective contraception during treatment and for 6 months following the last dose of Vyxeos liposomal.

Pregnancy

There are no data on the use of Vyxeos liposomal in pregnant women. Based on results from animal studies and its mechanism of action, Vyxeos liposomal should not be used during pregnancy, unless the clinical condition of the woman requires treatment and justifies the potential risk to the foetus (see section 5.3).

If the medicinal product is used during pregnancy, or if the patient becomes pregnant while receiving Vyxeos liposomal, the woman should be informed of the potential hazard to the foetus. In any case, cardiologic examination and a blood count are recommended in foetuses and newborns born to mothers who received treatment during pregnancy.

Breast-feeding

It is not known whether Vyxeos liposomal is excreted in human milk. Because of the potential for serious adverse reactions in breast-feeding children from Vyxeos liposomal, mothers should be advised not to breast-feed during Vyxeos liposomal therapy.

Fertility

Based on findings in animals, male fertility may be compromised by treatment with Vyxeos liposomal (see section 5.3).

Vyxeos liposomal has minor influence on the ability to drive and use machines. Fatigue and dizziness have been reported with the use of Vyxeos liposomal. Therefore, caution is recommended when driving or operating machines.

Summary of the safety profile

The most frequently occurring adverse reactions (ADRs) were hypersensitivity including rash (66.9%), febrile neutropenia (63.5%), oedema (52.3%), diarrhoea/colitis (49.9%), mucositis (49.9%), fatigue (46.4%), musculoskeletal pain (44.5%), abdominal pain (36.3%), decreased appetite (33.9%), cough (33.9%), headache (32.3%), chills (31.2%), arrhythmia (30.4%), pyrexia (29.6%), sleep disorders (25.1%), and hypotension (23.7%).

The most serious and frequently occurring ADRs were infection (58.7%), cardiotoxicity (18.7%) and haemorrhage (13.1%).

Tabulated list of adverse reactions

ADRs have been included under the appropriate category in the table below according to the highest frequency observed in any of the main clinical studies.

Frequencies are defined as: 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); not known (cannot be estimated from the available data).

Within each frequency grouping, adverse reactions are presented in order of decreasing seriousness. For classification of ADRs which occur at Grades 3-5, a comprehensive listing is available from the NCI at NCI CTCAE. Toxicity is graded as mild (Grade 1), moderate (Grade 2), severe (Grade 3), or life-threatening (Grade 4), with specific parameters according to the organ system involved. Death (Grade 5) is used for some of the criteria to denote a fatality.

Table 3: ADRs reported in clinical studies in patients treated with Vyxeos liposomal (n=375)

^a Arrhythmia group terms includes atrial fibrillation, bradycardia, and the most commonly reported arrhythmia was tachycardia

Description of selected adverse reactions

Infections

Due to the neutropenia experienced with Vyxeos liposomal, infections of various types were very common ADRs. Pneumonia, sepsis and bacteriaemia were the most frequently seen serious infection ADRs in the clinical studies population. The incidence of infection events was 78.1%; the incidence of non-serious events of infections was 73.1%, the incidence of serious events of infections was 28.5%; the incidence of infections which led to discontinuation is 0.5%. The incidence of fatal infections was 6.9%. The fatal infections experienced were sepsis and pneumonia (see section 4.4).

Haemorrhage

Due to the thrombocytopenia experienced with Vyxeos liposomal a variety of haemorrhagic events were seen in clinical studies. The most common haemorrhagic event was epistaxis, and the majority of these were considered not serious (29.1%). The incidence of haemorrhage events is 69.1%; the incidence of non-serious events of haemorrhage was 67.2 %; the incidence of serious events of haemorrhage is 5.6%; the incidence of haemorrhage which led to discontinuation is 0. The incidence of fatal haemorrhage was 2.1%. Serious or fatal haemorrhagic events, including fatal CNS haemorrhages, associated with severe thrombocytopenia were seen in patients treated with Vyxeos liposomal (see section 4.4).

Cardiotoxicity

Cardiotoxicities were seen in Vyxeos liposomal clinical studies. The most frequently reported serious ADRs were decreased ejection fraction and congestive cardiac failure. Cardiotoxicity is a known risk of anthracycline treatment. The incidence of all cardiotoxicity events was 72.0%; the incidence of non-serious events of cardiotoxicity was 68.5 %; the incidence of serious events of cardiotoxicity was 9.1%; the incidence of cardiotoxicity which led to discontinuation is 0. 5%. Incidence of fatal cardiotoxicity events is 0.5%. Cardiac arrest was reported as a fatal event; the patient experienced thrombocytopenia and neutropenia which contributed to cardiac arrest (see section 4.4).

Hypersensitivity

Hypersensitivity reactions were very common ADRs in Vyxeos liposomal clinical studies. The most frequently reported hypersensitivity ADRs were rash and the majority of these were not serious (38.9%). The incidence of all hypersensitivity events was 66.9%; the incidence of non-serious events of hypersensitivity was 66.4 %, of which 38.9 % were rash; the incidence of serious events of hypersensitivity is 1.1%; the frequency of hypersensitivity which led to discontinuation is 0. The frequency of fatal hypersensitivity events was 0 (see section 4.4).

Paediatric population

The safety profile of Vyxeos liposomal in 38 paediatric patients with relapsed AML in study AAML1421 appeared to be in general similar to that observed in the approved indication in adults with newly treated AML treated with Vyxeos liposomal (see section 4.2). However, adverse events in study AAML 1421 observed in paediatric patients that were different from or more severe than those seen in adults (acknowledging limitations of cross study comparisons) included rash maculo-papular (47.4%), electrocardiogram QT prolongation (28.9%), the early onset of cardiotoxicity (defined as > 10% decrease LVEF to final LVEF < 50% LVEF; 21.0%), severe hypokalaemia (13.2%), hyperglycaemia (7.9%) and ALT increased (7.9%). Hypertension was observed in 18.2% of these paediatric patients.

No paediatric long-term safety data beyond the study duration (26 months) are available. There is, thus, no paediatric safety data to address the long-term cardiotoxicity of Vyxeos liposomal, including long-term cardiotoxicity when used at doses above the maximum life-time cumulative anthracycline dose. There are no data on the effects of Vyxeos liposomal treatment on growth and maturation.

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

There is no specific experience in the management of overdose in patients. If overdose occurs, exacerbation of adverse reactions associated with Vyxeos liposomal are expected and supportive treatment (incuding anti-infectives, blood and platelet transfusions, colony-stimulating factors, and intensive care as needed) should be provided until the patient recovers. Observe the patient carefully over time for signs of cardiotoxicity and provide appropriate supportive therapy as clinically indicated.

Pharmacotherapeutic group: other antineoplastic agents, combinations of antineoplastic agents, cytarabine and daunorubicin, ATC code: L01XY01.

Mechanism of action

Vyxeos liposomal is a liposomal formulation of a fixed combination of daunorubicin and cytarabine in a 1:5 molar ratio. The 1:5 molar ratio has been shown in vitro and in vivo to maximise synergistic antitumour activity in AML.

Daunorubicin has antimitotic and cytotoxic activity, which is achieved by forming complexes with DNA, inhibiting topoisomerase II activity, inhibiting DNA polymerase activity, affecting regulation of gene expression, and producing DNA-damaging free radicals.

Cytarabine is a cell cycle phase-specific antineoplastic agent, affecting cells only during the S-phase of cell division. Intracellularly, cytarabine is converted into cytarabine-5-triphosphate (ara-CTP), which is the active metabolite. The mechanism of action is not completely understood, but it appears that ara-CTP acts primarily through inhibition of DNA synthesis. Incorporation into DNA and RNA may also contribute to cytarabine cytotoxicity. Cytarabine is cytotoxic to proliferating mammalian cells in culture.

Vyxeos liposomal liposomes exhibit a prolonged plasma half-life following intravenous infusion, with greater than 99% of the daunorubicin and cytarabine in the plasma remaining encapsulated within the liposomes. Vyxeos liposomal delivers a synergistic combination of daunorubicin and cytarabine to leukaemia cells for a prolonged period of time. Based on data in animals, Vyxeos liposomal liposomes accumulate and persist in high concentration in the bone marrow, where they are preferentially taken up intact by leukaemia cells in an active engulfment process. In leukaemia-bearing mice, the liposomes are taken up by leukaemia cells to a greater extent than by normal bone marrow cells. After internalisation, Vyxeos liposomal liposomes undergo degradation, releasing daunorubicin and cytarabine within the intracellular environment, enabling the medicinal products to exert their synergistic antineoplastic activity.

Clinical efficacy and safety

The efficacy of Vyxeos liposomal in adults for the treatment of newly diagnosed AML was evaluated in a single controlled clinical study (Study 301) and the efficacy of Vyxeos liposomal in paediatric patients for the treatment of relapsed AML was evaluated in a single clinical study AAML 1421.

Study 301 in patients with untreated high-risk AML

Study 301 was a Phase 3 randomised, multicentre, open-label, parallel-arm, superiority study which evaluated Vyxeos liposomal vs. a standard combination of cytarabine and daunorubicin (7+3) in 309 patients between 60 to 75 years of age with untreated high-risk AML. Patients with the following AML sub-types were included in the study: therapy-related AML (t-AML), myelodysplastic syndrome AML (MDS AML) and chronic myelomonocytic leukaemia AML (CMMoL AML) with documented history of MDS or CMMoL prior to transformation to AML, and de novo AML with karyotype changes characteristic of myelodysplasia, (per 2008 WHO criteria).

The study included 2 phases, 1) Treatment Phase during which patients received up to 2 induction and 2 consolidation courses, and 2) a Follow-up Phase, which began 30 days after the last induction or consolidation course and continued for up to 5 years from randomisation. The number of inductions and consolidations a patient received depended upon Complete Response (CR) or Complete Response with incomplete recovery (CRi), which was confirmed by bone marrow assessment. In clinical studies only, Vyxeos liposomal 100 units/m²/day (equivalent to 44 mg/100 mg/m²) was administered intravenously over 90 minutes on days 1, 3, and 5 for the first induction and on days 1 and 3 for patients requiring a second induction. A second induction was highly recommended for patients who did not achieve a CR or CRi in the first induction course and was mandatory for patients achieving greater than 50% reduction in percent blasts. Post-remission therapy with haematopoietic stem cell transplantation (HSCT) was permitted either in place of or after consolidation chemotherapy. For consolidation courses, in clinical studies only, the Vyxeos liposomal dose was reduced to 65 units/m²/day (equivalent to 29mg/65 mg/m²) on days 1 and 3. In the 7+3 arm, first induction consisted of cytarabine 100 mg/m²/day on days 1 to 7 by continuous infusion, and daunorubicin 60 mg/m²/day on days 1, 2, and 3 whereas second induction and consolidation cytarabine was dosed on days 1 to 5 and daunorubicin on days 1 and 2.

There were 153 patients randomised to Vyxeos liposomal and 156 patients randomised to the 7+3 control arm. The randomised patients had a median age of 68 (range 60-75 years), 61% were male, and 88% had an ECOG performance status of 0-1. At baseline 20% had t-AML, 54% had AML with an antecedent haematological disorder and 25% had de novo AML with myelodysplasia-related cytogenetic abnormalities; 34% had been treated previously with a hypomethylating agent for MDS;54% had an adverse karyotype.

The demographic and baseline disease characteristics were generally balanced between the study arms. FLT3 mutation was identified in 15% (43/279) of patients tested and NPM1 mutation was identified in 9% (25/283) patients tested.

The primary endpoint was overall survival measured from the date of randomisation to death from any cause. Vyxeos liposomal demonstrated superiority in overall survival in the ITT population compared with the comparator 7+3 treatment regimen (Figure 1). The median survival for the Vyxeos liposomal treatment group was 9.56 months compared with 5.95 months for the 7+3 treatment group (Hazard Ratio = 0.69, 95% CI = 0.52, 0.90, two-sided log-rank test p = 0.005).

The overall rate of HSCT was 34% (52/153) in the Vyxeos liposomal arm and 25% (39/156) on the control arm.

Figure 1: Kaplan-Meier curve for overall survival, ITT population

Table 4: Efficacy results for study 301

Abbreviations: CI = Confidence interval; CR= Complete response; CRi= Complete response with incomplete recovery

^a p-value from stratified log rank test stratifying by age and AML sub-type

^b p-value from stratified Cochran-Mantel-Haenszel test stratified by age and AML sub-type 60 Month Follow-up

The 60 month overall survival rate was higher for the Vyxeos liposomal treatment arm (18%) versus the 7+3 treatment arm (8%); the hazard ratio was 0.70, 95% CI= 0.55, 0.91.

Paediatric population

Relapsed AML

The efficacy of Vyxeos liposomal as a single agent was evaluated in a phase 1/2, single-arm study (AAML 1421) conducted to evaluate safety and efficacy of Vyxeos liposomal in 38 paediatric and young adult patients aged 1-21 years with AML in first relapse. Study treatment consisted of one induction cycle of Vyxeos liposomal 59 mg/135 mg/m² administered intravenously over 90 minutes on Days 1, 3, and 5 followed by Fludarabine, Cytarabine, and G-CSF (FLAG) for cycle 2. The median age of patients was 11 years (range, 1-21 years). Eight (21%) of the patients were between 18 and 21 years; patients who received > 450 mg/m² daunorubicin equivalents were excluded from the study.

The primary endpoint was overall response rate (defined as CR or CRp) after Vyxeos liposomal (Cycle 1) followed by FLAG (Cycle 2). The overall response rate was 68 (90% Clopper-Pearson CI 53% to 80%). After cycle 1, 16 (43%) patients had a treatment response of CR + CRp, including 14 (38%) patients who achieved CR, and based on the 7 subjects with relapse data available the median duration of CR was 284 days.

The Medicines and Healthcare products Regulatory Agency has deferred the obligation to submit the results of studies with Vyxeos liposomal in one or more subsets of the paediatric population in AML (see section 4.2 for information on paediatric use).

The pharmacokinetics of daunorubicin and cytarabine administered as Vyxeos liposomal were investigated in adult patients who received a dose of daunorubicin 44 mg/m² and cytarabine 100 mg/m² administered as a 90-minute intravenous infusion on days 1, 3, and 5. The pharmacokinetics of each medicinal product was based on total plasma concentrations (i.e., encapsulated plus unencapsulated medicinal product). Following the dose administered on day 5, the mean (% coefficient of variation [CV]) maximum plasma concentrations (C_max) for daunorubicin was 26.0 (32.7%) mcg/mL and cytarabine was 62.2 (33.7%) mcg/mL. The mean (%CV) area under the curve (AUC) during one dosing interval for daunorubicin was 637 (38.4%) mcg.h/mL and cytarabine was 1900 (44.3%) mcg.h/mL.

When daunorubicin and cytarabine are administered as components of Vyxeos liposomal, the liposomes appear to govern their tissue distribution and rates of elimination; therefore, while the non-liposomal medicinal products have markedly different clearance (CL), volume of distribution (V), and terminal half-life (t_1/2) Vyxeos liposomal causes these pharmacokinetic parameters to converge.

The accumulation ratio was 1.3 for daunorubicin and 1.4 for cytarabine. There was no evidence of time-dependent kinetics or major departures from dose proportionality over the range of 1.3 mg/3 mg per m² to 59 mg/134 mg per m² (0.03 to 1.3 times the approved recommended dosage).

Distribution

The volume of distribution (%CV) for daunorubicin is 6.6 L (36.8%) and cytarabine is 7.1 L (49.2%). Plasma protein binding was not evaluated.

Metabolism and biotransformation

Similar to non-liposomal daunorubicin and cytarabine, subsequent to release from Vyxeos liposomal liposomes, both daunorubicin and cytarabine are extensively metabolised in the body. Daunorubicin is mostly catalysed by hepatic and non-hepatic aldo-keto reductase and carbonyl reductase to the active metabolite daunorubicinol. Cytarabine is metabolised by cytidine deaminase to the inactive metabolite 1-β (beta)-D-arabinofuranosyluracil (AraU). Unlike non-liposomal daunorubicin and cytarabine, which are quickly metabolised to the respective metabolites, daunorubicin and cytarabine after Vyxeos liposomal administration are free bases encapsulated in liposomes. Plasma concentration-time profiles obtained from 13 to 26 patients who received Vyxeos liposomal 100 units/m² (equivalent to 44 mg/ m² of daunorubicin and 100 mg/m² of cytarabine) on days 1, 3, and 5 show the mean AUC_last metabolite:parent ratio for daunorubicinol and AraU were 1.79% and 3.22% to that for daunorubicin and cytarabine, respectively; which are lower than those typically reported for non-liposomal products, ~40-60% for daunorubicinol:daunorubicin and ~80% for AraU:cytarabine. The lower percentages of metabolite:parent ratios after Vyxeos liposomal administration indicate that most of the total daunorubicin and cytarabine in the circulation is trapped inside the Vyxeos liposomal liposomes, where they are inaccessible to medicinal product-metabolising enzymes.

Elimination

Vyxeos liposomal exhibits a prolonged half-life (%CV) of 31.5 h (28.5%) for daunorubicin and 40.4 h (24.2%) for cytarabine with greater than 99% of the daunorubicin and cytarabine in the plasma remaining encapsulated within the liposomes. The clearance (%CV) is 0.16 L/h (53.3%) for daunorubicin and 0.13 L/h (60.2%) for cytarabine.

Urinary excretion of daunorubicin and daunorubicinol accounts for 9% of the administered dose of daunorubicin, and urinary excretion of cytarabine and AraU accounts for 71% of the administered dose of cytarabine.

Special populations

In a population pharmacokinetic analysis, no clinically meaningful effects on clearance and volume parameters of daunorubicin and cytarabine by age (1 to 81 years), sex, race, body weight, body mass index, and white blood cell count were observed.

Paediatric population

The dose-normalized mean exposures of total daunorubicin and cytarabine observed in paediatric patients after 59 mg/135 mg/m² were comparable to those of daunorubicin and cytarabine after 44 mg/100 mg/m² in adults.

Elderly population

The pharmacokinetics of Vyxeos liposomal in patients aged > 85 years has not yet been evaluated. No data are available.

Renal impairment

Based on a dedicated study to evaluate the impact of moderate to severe renal impairment on the pharmacokinetics of Vyxeos liposomal and a population pharmacokinetic analysis using data from clinical studies in patients with mild to moderate renal impairment, no significant difference in clearance of daunorubicin or cytarabine was observed in patients with pre-existing mild, moderate or severe renal impairment compared to patients with baseline normal renal function. The potential effects of end-stage renal disease managed with dialysis on the pharmacokinetics of daunorubicin and cytarabine administered as Vyxeos liposomal are unknown (see section 4.2).

Hepatic impairment

The pharmacokinetics of total daunorubicin and cytarabine were not altered in patients with bilirubin ≤ 50 µ mol/L. The pharmacokinetics in patients with bilirubin greater than 50 µ mol/L is unknown.

The repeat-dose toxicity of Vyxeos liposomal was tested in two-cycle intravenous infusion toxicity studies with 28-day recovery periods in rats and dogs. Adverse effects of Vyxeos liposomal occurred at all dose levels (low to null safety margins based on systemic exposures) and were generally consistent with those documented for non-liposomal daunorubicin and/or cytarabine, comprising mainly gastrointestinal and hematological findings. Although central nervous system (CNS) and cardiovascular system parameters were included in these studies, given the observed morbidity and mortality, there was insufficient information to conduct an integrated assessment of the safety pharmacology of Vyxeos liposomal.

Genotoxicity, carcinogenicity, and reproductive and developmental toxicity studies have not been conducted with Vyxeos liposomal. However studies are available with the single agents.

Genotoxicity

Cytarabine or its active metabolity Ara-C was mutagenic (bacterial mutagenicity assay) and clastogenic in vitro (chromosome aberrations and sister-chromatid exchanges (SCE) in human leukocytes) and in vivo (chromosome aberrations and SCE assay in rodent). Cytarabine caused the transformation of hamster embryo cells and rat H43 cells in vitro and was clastogenic to meiotic cells. Daunorubicin was mutagenic (bacterial mutagenicity assay, V79 hamster cell assay) and clastogenic in vitro (CCRF CEM human lymphoblasts) and in vivo (SCE assay in mouse bone marrow).

Carcinogenicity

Studies with cytarabine were not identified. Published data with Ara-C, the active metabolite of cytarabine, did not provide evidence of carcinogenicity. Published data with daunorubicin suggest possible tumorigenicity in rats after a single dose of 5 or 10 mg/kg (0.68 to 1.4 times the RHD based on mg/m²). The IARC Working Group (IARC 2000) classified daunorubicin in Group 2B (possibly carcinogenic to humans).

Reproductive and developmental toxicity

Cytarabine was embryotoxic in mice and teratogenic in mice and rats when administered during organogenesis. Cytarabine also caused, sperm-head abnormalities in mice and impaired spermatogenesis in rats. A single dose of cytarabine in rats, administered on day 14 of gestation, reduced prenatal and postnatal brain size and caused permanent impairment of learning ability. Daunorubicin was embryotoxic and caused fetal malformations when given during the period of organogenesis in rats. Daunorubicin caused testicular atrophy and total aplasia of spermatocytes in the seminiferous tubules in dogs.

Environmental risk assessment (ERA)

Environmental risk assessment has shown that Vyxeos liposomal is not anticipated to have the potential to be persistent, bioaccumulative, or toxic to the environment.

Distearoylphosphatidylcholine

Distearoylphosphatidylglycerol

Cholesterol

Copper gluconate

Trolamine (for pH adjustment)

Sucrose

This medicinal product must not be mixed with other medicinal products except those mentioned in section 6.6.

Unopened vials

48 months

Stability of reconstituted suspension in the vial

Chemical and physical in-use stability has been demonstrated for 4 hours at 2° C to 8° C when kept in an upright position.

From a microbiological point of view, unless the method of opening/reconstitution/dilution precludes the risk of microbial contamination, the product should be used immediately.

If not used immediately, in-use storage times and conditions are the responsibility of the user.

Stability of diluted infusion solution

Chemical and physical in-use stability has been demonstrated for 4 hours at 2° C to 8° C.

From a microbiological point of view, unless the method of opening/reconstitution/dilution precludes the risk of microbial contamination, the product should be used immediately.

If not used immediately, in-use storage times and conditions are the responsibility of the user.

The maximum combined storage time for reconstituted product in the vial and reconstituted product diluted into an infusion bag is up to 4 hours at 2° C to 8° C.

Store in a refrigerator (2° C – 8° C).

Keep the vial in the original carton in order to protect from light. Store in an upright position.

For storage conditions after reconstitution and dilution of the medicinal product, see section 6.3.

50 mL vial (type 1 glass) with a stopper (chlorobutyl rubber), and an overseal (aluminium) containing 44 mg daunorubicin and 100 mg cytarabine.

Each pack contains either 1 vial, 2 vials or 5 vials. Not all pack sizes may be marketed.

Vyxeos liposomal is a cytotoxic medicinal product. Applicable special handling and disposal procedures should be followed. The product is intended for single use only. Any unused product should be disposed of in accordance with local requirements for cytotoxic agents.

Preparation instructions

• Determine the dose and number of vials of Vyxeos liposomal based on the individual patient's BSA as outlined in section 4.2.

• Remove the appropriate number of vials of Vyxeos liposomal from the refrigerator and equilibrate to the room temperature (15° C to 30° C) for 30 minutes.

• Then, reconstitute each vial with 19 mL of sterile water for injections using a 20 mL syringe, and immediately thereafter start a 5-minute timer.

• Carefully swirl the contents of the vial for 5 minutes while gently inverting the vial every 30 seconds.

• Do not heat, vortex, or shake vigorously.

• After reconstitution, let it rest for 15 minutes.

• The reconstituted product should be an opaque, purple, homogeneous dispersion, essentially free from visual particulates.

• If the reconstituted product is not diluted into an infusion bag immediately, store in a refrigerator (2° C to 8° C) for up to 4 hours.

• Following the storage of reconstituted product in the vial for up to 4 hours at 2° C to 8° C in an upright position, the reconstituted product must immediately be diluted into an infusion solution and run for the 90-minute infusion time.

• Calculate the volume of reconstituted Vyxeos liposomal required using the following formula:

[volume required (mL) = dose of daunorubicin (mg/m²) x patient's BSA (m²)/2.2 (mg/mL)]. The concentration of the reconstituted solution is 44 mg/20 mL (2.2 mg/mL) daunorubicin and 100 mg/20 mL (5 mg/mL) cytarabine.

• Gently invert each vial 5 times prior to withdrawing the concentrate for dilution.

• Aseptically withdraw the calculated volume of reconstituted Vyxeos liposomal from the vial(s) with a sterile syringe and transfer it to an infusion bag containing 500 mL of sodium chloride 9 mg/mL (0.9%) solution for injection, or 5% glucose. There may be residual product remaining in the vial. Discard unused portion.

• Gently invert the bag to mix the solution. The dilution of the reconstituted product results in a deep purple, translucent, homogeneous dispersion.

• If the diluted infusion solution is not used immediately, store in a refrigerator (2° C to 8° C) for up to 4 hours.

• Gently invert the bag to mix the solution after refrigeration.

Administration instructions

• Do not mix Vyxeos liposomal with, or administer as an infusion with, other medicinal products.

• Administer Vyxeos liposomal by constant intravenous infusion over 90 minutes via an infusion pump through a central venous catheter or a peripherally inserted central catheter. An in-line membrane filter may be used for the intravenous infusion of Vyxeos liposomal, provided the minimum pore diameter of the filter is greater than or equal to 15 µ m.

• Flush the line after administration with sodium chloride 9 mg/mL (0.9%) solution for injection.

This medicinal product could have potential risk for the environment due to the cytotoxic and antimitotic activities, which could induce possible reproductive effects. All materials used for dilution and administration should be disposed of according to local procedures applicable to the discarding of antineoplastic agents. Any unused medicinal product or waste material should be disposed of in accordance with local requirements for cytotoxic agents.