Инлита

Инлита is indicated for the treatment of adult patients with advanced renal cell carcinoma (RCC) after failure of prior treatment with sunitinib or a cytokine.

Treatment with Инлита should be conducted by a physician experienced in the use of anticancer therapies.

Posology

The recommended dose of axitinib is 5 mg twice daily.

Treatment should continue as long as clinical benefit is observed or until unacceptable toxicity occurs that cannot be managed by concomitant medicinal products or dose adjustments.

If the patient vomits or misses a dose, an additional dose should not be taken. The next prescribed dose should be taken at the usual time.

Dose adjustments

Dose increase or reduction is recommended based on individual safety and tolerability.

Patients who tolerate the axitinib starting dose of 5 mg twice daily with no adverse reactions > Grade 2 (i.e. without severe adverse reactions according to the Common Terminology Criteria for Adverse Events [CTCAE] version 3.0) for two consecutive weeks may have their dose increased to 7 mg twice daily unless the patient's blood pressure is > 150/90 mmHg or the patient is receiving antihypertensive treatment. Subsequently, using the same criteria, patients who tolerate an axitinib dose of 7 mg twice daily may have their dose increased to a maximum of 10 mg twice daily.

Management of some adverse reactions may require temporary or permanent discontinuation and/or dose reduction of axitinib therapy. When dose reduction is necessary, the axitinib dose may be reduced to 3 mg twice daily and further to 2 mg twice daily.

Dose adjustment is not required on the basis of patient age, race, gender, or body weight.

Concomitant strong CYP3A4/5 inhibitors

Co-administration of axitinib with strong CYP3A4/5 inhibitors may increase axitinib plasma concentrations. Selection of an alternate concomitant medicinal product with no or minimal CYP3A4/5 inhibition potential is recommended.

Although axitinib dose adjustment has not been studied in patients receiving strong CYP3A4/5 inhibitors, if a strong CYP3A4/5 inhibitor must be co-administered, a dose decrease of axitinib to approximately half the dose (e.g. the starting dose should be reduced from 5 mg twice daily to 2 mg twice daily) is recommended. Management of some adverse reactions may require temporary or permanent discontinuation of axitinib therapy. If co-administration of the strong inhibitor is discontinued, a return to the axitinib dose used prior to initiation of the strong CYP3A4/5 inhibitor should be considered.

Concomitant strong CYP3A4/5 inducers

Co-administration of axitinib with strong CYP3A4/5 inducers may decrease axitinib plasma concentrations. Selection of an alternate concomitant medicinal product with no or minimal CYP3A4/5 induction potential is recommended.

Although axitinib dose adjustment has not been studied in patients receiving strong CYP3A4/5 inducers, if a strong CYP3A4/5 inducer must be co-administered, a gradual dose increase of axitinib is recommended. Maximal induction with high-dose strong CYP3A4/5 inducers has been reported to occur within one week of treatment with the inducer. If the dose of axitinib is increased, the patient should be monitored carefully for toxicity. Management of some adverse reactions may require temporary or permanent discontinuation and/or dose reduction of axitinib therapy. If co-administration of the strong inducer is discontinued, the axitinib dose should be immediately returned to the dose used prior to initiation of the strong CYP3A4/5 inducer.

Special populations

Elderly (> 65 years)

No dose adjustment is required.

Renal impairment

No dose adjustment is required. Virtually no data are available regarding axitinib treatment in patients with a creatinine clearance of < 15 mL/min.

Hepatic impairment

No dose adjustment is required when administering axitinib to patients with mild hepatic impairment (Child-Pugh class A). A dose decrease is recommended when administering axitinib to patients with moderate hepatic impairment (Child-Pugh class B) (e.g. the starting dose should be reduced from 5 mg twice daily to 2 mg twice daily). Axitinib has not been studied in patients with severe hepatic impairment (Child-Pugh class C) and should not be used in this population.

Paediatric population

The safety and efficacy of Инлита in children and adolescents < 18 years have not been established. No data are available.

Method of administration

Axitinib is for oral use. The tablets should be taken orally twice daily approximately 12 hours apart with or without food. They should be swallowed whole with a glass of water.

Specific safety events should be monitored before initiation of, and periodically throughout, treatment with axitinib as described below.

Cardiac failure events

In clinical studies with axitinib for the treatment of patients with RCC, cardiac failure events (including cardiac failure, cardiac failure congestive, cardiopulmonary failure, left ventricular dysfunction, ejection fraction decreased, and right ventricular failure) were reported.

Signs or symptoms of cardiac failure should periodically be monitored throughout treatment with axitinib. Management of cardiac failure events may require temporary interruption or permanent discontinuation and/or dose reduction of axitinib therapy.

Hypertension

In clinical studies with axitinib for the treatment of patients with RCC, hypertension was very commonly reported.

In a controlled clinical study, the median onset time for hypertension (systolic blood pressure > 150 mmHg or diastolic blood pressure > 100 mmHg) was within the first month of the start of axitinib treatment and blood pressure increases have been observed as early as 4 days after starting axitinib.

Blood pressure should be well-controlled prior to initiating axitinib. Patients should be monitored for hypertension and treated as needed with standard antihypertensive therapy. In the case of persistent hypertension, despite use of antihypertensive medicinal products, the axitinib dose should be reduced. For patients who develop severe hypertension, temporarily interrupt axitinib and restart at a lower dose once the patient is normotensive. If axitinib is interrupted, patients receiving antihypertensive medicinal products should be monitored for hypotension.

In case of severe or persistent arterial hypertension and symptoms suggestive of posterior reversible encephalopathy syndrome (PRES) (see below), a diagnostic brain magnetic resonance image (MRI) should be considered.

Thyroid dysfunction

In clinical studies with axitinib for the treatment of patients with RCC, events of hypothyroidism and, to a lesser extent, hyperthyroidism, were reported.

Thyroid function should be monitored before initiation of, and periodically throughout, treatment with axitinib. Hypothyroidism or hyperthyroidism should be treated according to standard medical practice to maintain euthyroid state.

Arterial embolic and thrombotic events

In clinical studies with axitinib, arterial embolic and thrombotic events (including transient ischemic attack, myocardial infarction, cerebrovascular accident and retinal artery occlusion) were reported.

Axitinib should be used with caution in patients who are at risk for, or who have a history of, these events. Axitinib has not been studied in patients who had an arterial embolic or thrombotic event within the previous 12 months.

Venous embolic and thrombotic events

In clinical studies with axitinib, venous embolic and thrombotic events (including pulmonary embolism, deep vein thrombosis, and retinal vein occlusion/thrombosis) were reported.

Axitinib should be used with caution in patients who are at risk for, or who have a history of, these events. Axitinib has not been studied in patients who had a venous embolic or thrombotic event within the previous 6 months.

Elevation of haemoglobin or haematocrit

Increases in haemoglobin or haematocrit, reflective of increases in red blood cell mass, may occur during treatment with axitinib. An increase in red blood cell mass may increase the risk of embolic and thrombotic events.

Haemoglobin or haematocrit should be monitored before initiation of, and periodically throughout, treatment with axitinib. If haemoglobin or haematocrit becomes elevated above the normal level, patients should be treated according to standard medical practice to decrease haemoglobin or haematocrit to an acceptable level.

Haemorrhage

In clinical studies with axitinib, haemorrhagic events were reported.

Axitinib has not been studied in patients who have evidence of untreated brain metastasis or recent active gastrointestinal bleeding, and should not be used in those patients. If any bleeding requires medical intervention, temporarily interrupt the axitinib dose.

Gastrointestinal perforation and fistula formation

In clinical studies with axitinib, events of gastrointestinal perforation and fistulas were reported.

Symptoms of gastrointestinal perforation or fistula should be periodically monitored for throughout treatment with axitinib.

Wound healing complications

No formal studies of the effect of axitinib on wound healing have been conducted.

Treatment with axitinib should be stopped at least 24 hours prior to scheduled surgery. The decision to resume axitinib therapy after surgery should be based on clinical judgment of adequate wound healing.

Posterior reversible encephalopathy syndrome (PRES)

In clinical studies with axitinib, events of PRES were reported.

PRES is a neurological disorder which can present with headache, seizure, lethargy, confusion, blindness and other visual and neurologic disturbances. Mild to severe hypertension may be present. Magnetic resonance imaging is necessary to confirm the diagnosis of PRES. In patients with signs or symptoms of PRES, temporarily interrupt or permanently discontinue axitinib treatment. The safety of reinitiating axitinib therapy in patients previously experiencing PRES is not known.

Proteinuria

In clinical studies with axitinib, proteinuria, including that of Grade 3 and 4 severity, was reported.

Monitoring for proteinuria before initiation of, and periodically throughout, treatment with axitinib is recommended. For patients who develop moderate to severe proteinuria, reduce the dose or temporarily interrupt axitinib treatment. Axitinib should be discontinued if the patient develops nephrotic syndrome.

Liver-related adverse reactions

In a controlled clinical study with axitinib for the treatment of patients with RCC, liver-related adverse reactions were reported. The most commonly reported liver-related adverse reactions included increases in alanine aminotransferase (ALT), aspartate aminotransferase (AST), and blood bilirubin. No concurrent elevations of ALT (> 3 times the upper limit of normal [ULN]) and bilirubin (> 2 times the ULN) were observed.

In a clinical dose-finding study, concurrent elevations of ALT (12 times the ULN) and bilirubin (2.3 times the ULN), considered to be drug-related hepatotoxicity, were observed in 1 patient who received axitinib at a starting dose of 20 mg twice daily (4 times the recommended starting dose).

Liver function tests should be monitored before initiation of, and periodically throughout, treatment with axitinib.

Hepatic impairment

In clinical studies with axitinib, the systemic exposure to axitinib was approximately two-fold higher in subjects with moderate hepatic impairment (Child-Pugh class B) compared to subjects with normal hepatic function. A dose decrease is recommended when administering axitinib to patients with moderate hepatic impairment (Child-Pugh class B).

Axitinib has not been studied in patients with severe hepatic impairment (Child-Pugh class C) and should not be used in this population.

Elderly (> 65 years) and race

In a controlled clinical study with axitinib for the treatment of patients with RCC, 34% of patients treated with axitinib were > 65 years of age. The majority of patients were White (77%) or Asian (21%). Although greater sensitivity to develop adverse reactions in some older patients and Asian patients cannot be ruled out, overall, no major differences were observed in the safety and effectiveness of axitinib between patients who were > 65 years of age and non-elderly, and between White patients and patients of other races.

No dosage adjustment is required on the basis of patient age or race.

Lactose

This medicinal product contains lactose. Patients with rare hereditary problems of galactose intolerance, Lapp lactase deficiency or glucose-galactose malabsorption should not take this medicinal product.

Axitinib has minor influence on the ability to drive and use machines. Patients should be advised that they may experience events such as dizziness and/or fatigue during treatment with axitinib.

Summary of the safety profile

The most common (> 20%) adverse reactions observed following treatment with axitinib were diarrhoea, hypertension, fatigue, decreased appetite, nausea, weight decreased, dysphonia, palmar-plantar erythrodysaesthesia (hand-foot) syndrome, haemorrhage, hypothyroidism, vomiting, proteinuria, cough, and constipation.

Tabulated list of adverse reactions

Table 1 presents adverse reactions reported in a pooled dataset of 672 patients who received axitinib in clinical studies for the treatment of patients with RCC.

The adverse reactions are listed by system organ class, frequency category and grade of severity. Frequency categories 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), very rare (< 1/10,000), and not known (cannot be estimated from the available data). The current safety database for axitinib is too small to detect rare and very rare adverse reactions.

Categories have been assigned based on absolute frequencies in the pooled clinical studies data. Within each system organ class, adverse reactions with the same frequency are presented in order of decreasing seriousness.

Table 1. Adverse reactions reported in RCC studies in patients who received axitinib (N = 672)

^a Adverse reactions are according to treatment-emergent, all causality frequency.

^b National Cancer Institute Common Terminology Criteria for Adverse Events, Version 3.0

^c See Description of selected adverse reactions section.

^d Fatal (Grade 5) cases were reported.

^e Including Leukoencephalopathy.

^f Including cardiac failure, cardiac failure congestive, cardiopulmonary failure, ejection fraction decreased, left ventricular dysfunction and right ventricular failure.

^g Including accelerated hypertension, blood pressure increased, hypertension and hypertensive crisis.

^h Including activated partial thromboplastin time prolonged, anal haemorrhage, arterial haemorrhage, blood urine present, central nervous system haemorrhage, cerebral haemorrhage, coagulation time prolonged, conjunctival haemorrhage, contusion, diarrhea haemorrhagic, dysfunctional uterine bleeding, epistaxis, gastric haemorrhage, gastrointestinal haemorrhage, gingival bleeding, haematemesis, haematochezia, haematocrit decreased, haematoma, haematuria, haemoglobin decreased, haemoptysis, haemorrhage, haemorrhage coronary artery, haemorrhage urinary tract, haemorrhoidal haemorrhage, haemostasis, increased tendency to bruise, international normalized ratio increased, lower gastrointestinal haemorrhage, melaena, petechiae, pharyngeal haemorrhage, prothrombin time prolonged, pulmonary haemorrhage, purpura, rectal haemorrhage, red blood cell count decreased, renal haemorrhage, scleral haemorrhage, scrotal haematocoele, splenic haemotoma, splinter haemorrhage, subarachnoid haemorrhage, tongue haemorrhage, upper gastrointestinal haemorrhage and vaginal haemorrhage.

ⁱ Including Budd-Chiari syndrome, deep vein thrombosis, jugular vein thrombosis, pelvic venous thrombosis, pulmonary embolism, retinal vein occlusion, retinal vein thrombosis, subclavian vein thrombosis, venous thrombosis, and venous thrombosis limb.

^j Including acute myocardial infarction, embolism, myocardial infarction, retinal artery occlusion and transient ischaemic attack.

^k Gastrointestinal perforation and fistula includes the following preferred terms: abdominal abscess, anal abscess, anal fistula, fistula, gastrointestinal anastomotic leak, gastrointestinal perforation, large intestine perforation, oesophagobronchial fistula and peritonitis.

^l Proteinuria includes the following preferred terms: protein urine, protein urine present and proteinuria.

^m Including acute renal failure

Description of selected adverse reactions

Cardiac failure events

In a controlled clinical study with axitinib (N = 359) for the treatment of patients with RCC, cardiac failure events were reported in 1.7 % patients receiving axitinib, including cardiac failure (0.6%), cardiopulmonary failure (0.6%), left ventricular dysfunction (0.3%), and right ventricular failure (0.3%). Grade 4 cardiac failure adverse reactions were reported in 0.6 % of patients receiving axitinib. Fatal cardiac failure was reported in 0.6 % of patients receiving axitinib.

In monotherapy studies with axitinib (N = 672) for the treatment of patients with RCC, cardiac failure events (including cardiac failure, cardiac failure congestive, cardiopulmonary failure, left ventricular dysfunction, ejection fraction decreased, and right ventricular failure) were reported in 1.8% patients receiving axitinib. Grade 3/4 cardiac failure events were reported in 1.0% patients and fatal cardiac failure events were reported in 0.3% patients receiving axitinib.

Thyroid dysfunction

In a controlled clinical study with axitinib for the treatment of patients with RCC, hypothyroidism was reported in 20.9% of patients and hyperthyroidism was reported in 1.1% of patients. Thyroid stimulating hormone (TSH) increased was reported as an adverse reaction in 5.3% of patients receiving axitinib. During routine laboratory assessments, in patients who had TSH < 5 μU/mL before treatment, elevations of TSH to > 10 μU/mL occurred in 32.2% of patients receiving axitinib.

In pooled clinical studies with axitinib (N = 672) for the treatment of patients with RCC, hypothyroidism was reported in 24.6% of patients receiving axitinib. Hyperthyroidism was reported in 1.6% of patients receiving axitinib.

Venous embolic and thrombotic events

In a controlled clinical study with axitinib for the treatment of patients with RCC, venous embolic and thrombotic adverse reactions were reported in 3.9% of patients receiving axitinib, including pulmonary embolism (2.2%), retinal vein occlusion/thrombosis (0.6%) and deep vein thrombosis (0.6%). Grade 3/4 venous embolic and thrombotic adverse reactions were reported in 3.1% of patients receiving axitinib. Fatal pulmonary embolism was reported in one patient (0.3%) receiving axitinib.

In pooled clinical studies with axitinib (N = 672) for the treatment of patients with RCC, venous embolic and thrombotic events were reported in 2.8% of patients receiving axitinib. Grade 3 venous embolic and thrombotic events were reported in 0.9% of patients. Grade 4 venous embolic and thrombotic events were reported in 1.2% of patients. Fatal venous embolic and thrombotic events were reported 0.1% patients receiving axitinib.

Arterial embolic and thrombotic events

In a controlled clinical study with axitinib for the treatment of patients with RCC, arterial embolic and thrombotic adverse reactions were reported in 4.7% of patients receiving axitinib, including myocardial infarction (1.4%), transient ischemic attack (0.8%) and cerebrovascular accident (0.6%). Grade 3/4 arterial embolic and thrombotic adverse reactions were reported in 3.3% of patients receiving axitinib. A fatal acute myocardial infarction and cerebrovascular accident was reported in one patient each (0.3%). In monotherapy studies with axitinib (N = 850), arterial embolic and thrombotic adverse reactions (including transient ischemic attack, myocardial infarction, and cerebrovascular accident) were reported in 5.3% of patients receiving axitinib.

In pooled clinical studies with axitinib (N = 672) for the treatment of patients with RCC, arterial embolic and thrombotic events were reported in 2.8% of patients receiving axitinib. Grade 3 arterial embolic and thrombotic events were reported in 1.2% of patients. Grade 4 arterial embolic and thrombotic events were reported in 1.3% of patients. Fatal arterial embolic and thrombotic events were reported in 0.3% patients receiving axitinib.

<)

In a controlled clinical study with axitinib for the treatment of patients with RCC, polycythaemia was reported in 1.4% of patients receiving axitinib. Routine laboratory assessments detected elevated haemoglobin above ULN in 9.7% of patients receiving axitinib. In four clinical studies with axitinib for the treatment of patients with RCC (N = 537), elevated haemoglobin above ULN was observed in 13.6% receiving axitinib.

In pooled clinical studies with axitinib (N = 672) for the treatment of patients with RCC, polycythaemia was reported in 1.5% of patients receiving axitinib.

Haemorrhage

In a controlled clinical study with axitinib for the treatment of patients with RCC that excluded patients with untreated brain metastasis, haemorrhagic adverse reactions were reported in 21.4% of patients receiving axitinib. The haemorrhagic adverse reactions in patients treated with axitinib included epistaxis (7.8%), haematuria (3.6%), haemoptysis (2.5%), rectal haemorrhage (2.2%), gingival bleeding (1.1%), gastric haemorrhage (0.6%), cerebral haemorrhage (0.3%) and lower gastrointestinal haemorrhage (0.3%). Grade > 3 haemorrhagic adverse reactions were reported in 3.1% of patients receiving axitinib (including cerebral haemorrhage, gastric haemorrhage, lower gastrointestinal haemorrhage and haemoptysis). Fatal haemorrhage was reported in one patient (0.3%) receiving axitinib (gastric haemorrhage). In monotherapy studies with axitinib (N = 850), haemoptysis was reported in 3.9% of patients; Grade > 3 haemoptysis was reported in 0.5% of patients.

In pooled clinical studies with axitinib (N = 672) for the treatment of patients with RCC, haemorrhagic events were reported in 25.7% of patients receiving axitinib. Grade 3 haemorrhagic adverse reactions were reported in 3% of patients. Grade 4 haemorrhagic adverse reactions were reported in 1% of patients and fatal haemorrhage were reported in 0.4% of patients receiving axitinib.

Gastrointestinal perforation and fistula formation

In a controlled clinical study with axitinib for the treatment of patients with RCC, gastrointestinal perforation-type events were reported in 1.7% of patients receiving axitinib, including anal fistula (0.6%), fistula (0.3%) and gastrointestinal perforation (0.3%). In monotherapy studies with axitinib (N = 850), gastrointestinal perforation-type events were reported in 1.9% of patients and fatal gastrointestinal perforation was reported in one patient (0.1%).

In pooled clinical studies with axitinib (N = 672) for the treatment of patients with RCC, gastrointestinal perforation and fistula were reported in 1.9% of patients receiving axitinib.

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 the Yellow Card Scheme at www.mhra.gov.uk/yellowcard.

There is no specific treatment for axitinib overdose.

In a controlled clinical study with axitinib for the treatment of patients with RCC, one patient inadvertently received a dose of 20 mg twice daily for 4 days and experienced dizziness (Grade 1).

In a clinical dose finding study with axitinib, subjects who received starting doses of 10 mg twice daily or 20 mg twice daily experienced adverse reactions which included hypertension, seizures associated with hypertension, and fatal haemoptysis.

In cases of suspected overdose, axitinib should be withheld and supportive care instituted.

Pharmacotherapeutic group: Antineoplastic agents, protein kinase inhibitors, ATC code: L01XE17

Mechanism of action

Axitinib is a potent and selective tyrosine kinase inhibitor of vascular endothelial growth factor receptors (VEGFR)-1, VEGFR-2 and VEGFR-3. These receptors are implicated in pathologic angiogenesis, tumour growth, and metastatic progression of cancer. Axitinib has been shown to potently inhibit VEGF-mediated endothelial cell proliferation and survival. Axitinib inhibited the phosphorylation of VEGFR-2 in xenograft tumour vasculature that expressed the target in vivo and produced tumour growth delay, regression, and inhibition of metastases in many experimental models of cancer.

Effect on QTc interval

In a randomised, 2-way crossover study, 35 healthy subjects were administered a single oral dose of axitinib (5 mg) in the absence and presence of 400 mg ketoconazole for 7 days. Results of this study indicated that axitinib plasma exposures up to two-fold greater than therapeutic levels expected following a 5 mg dose, did not produce clinically-significant QT interval prolongation.

Clinical efficacy and safety

The safety and efficacy of axitinib were evaluated in a randomised, open-label, multicenter Phase 3 study. Patients (N = 723) with advanced RCC whose disease had progressed on or after treatment with one prior systemic therapy, including sunitinib-, bevacizumab-, temsirolimus-, or cytokine-containing regimens were randomised (1:1) to receive axitinib (N = 361) or sorafenib (N = 362). The primary endpoint, progression-free survival (PFS), was assessed using a blinded independent central review. Secondary endpoints included objective response rate (ORR) and overall survival (OS).

Of the patients enrolled in this study, 389 patients (53.8%) had received one prior sunitinib-based therapy, 251 patients (34.7%) had received one prior cytokine-based therapy (interleukin-2 or interferon-alpha), 59 patients (8.2%) had received one prior bevacizumab-based therapy, and 24 patients (3.3%) had received one prior temsirolimus-based therapy. The baseline demographic and disease characteristics were similar between the axitinib and sorafenib groups with regard to age, gender, race, Eastern Cooperative Oncology Group (ECOG) performance status, geographic region, and prior treatment.

In the overall patient population and the two main subgroups (prior sunitinib treatment and prior cytokine treatment), there was a statistically significant advantage for axitinib over sorafenib for the primary endpoint of PFS (see Table 2 and Figures 1, 2 and 3). The magnitude of median PFS effect was different in the subgroups by prior therapy. Two of the subgroups were too small to give reliable results (prior temsirolimus treatment or prior bevacizumab treatment). There were no statistically significant differences between the arms in OS in the overall population or in the subgroups by prior therapy.

Table 2. Efficacy results

CI = Confidence interval, HR = Hazard ratio (axitinib/sorafenib); ITT: Intent-to-treat; NE: not estimable; NS: not statistically significant; ORR: Objective response rate; OS: Overall survival; PFS: Progression-free survival.

^a Time from randomisation to progression or death due to any cause, whichever occurs first. Cutoff date: 03 June 2011.

^b Assessed by independent radiology review according to Response Evaluation Criteria in Solid Tumours (RECIST).

^c One-sided p-value from a log-rank test of treatment stratified by ECOG performance status and prior therapy.

^d Cutoff date: 01 November 2011.

^e Cutoff date: 31 August 2010.

^f Risk ratio is used for ORR. A risk ratio > 1 indicated a higher likelihood of responding in the axitinib arm; a risk ratio < 1 indicated a higher likelihood of responding in the sorafenib arm.

^g One-sided p-value from Cochran-Mantel-Haenszel test of treatment stratified by ECOG performance status and prior therapy.

^h One-sided p-value from a log-rank test of treatment stratified by ECOG performance status.

ⁱ One-sided p-value from Cochran-Mantel-Haenszel test of treatment stratified by ECOG performance status.

Figure 1. Kaplan-Meier curve of progression-free survival by independent assessment for the overall population

Figure 2. Kaplan-Meier curve of progression-free survival by independent assessment for the prior sunitinib subgroup

Figure 3. Kaplan-Meier curve of progression-free survival by independent assessment for the prior cytokine subgroup

Paediatric population

After oral administration of axitinib tablets, the mean absolute bioavailability is 58% compared to intravenous administration. The plasma half life of axitinib ranges from 2.5 to 6.1 hours. Dosing of axitinib at 5 mg twice daily resulted in less than two-fold accumulation compared to administration of a single dose. Based on the short half-life of axitinib, steady state is expected within 2 to 3 days of the initial dose.

Absorption and distribution

Peak axitinib concentrations in plasma are generally reached within 4 hours following oral administration of axitinib with median T_max ranging from 2.5 to 4.1 hours. Administration of axitinib with a moderate fat meal resulted in 10% lower exposure compared to overnight fasting. A high fat, high-calorie meal resulted in 19% higher exposure compared to overnight fasting. Axitinib may be administered with or without food.

The average C_max and AUC increased proportionally over an axitinib dosing range of 5 to 10 mg. In vitro binding of axitinib to human plasma proteins is > 99% with preferential binding to albumin and moderate binding to α₁-acid glycoprotein. At the 5 mg twice daily dose in the fed state, the geometric mean peak plasma concentration and 24-hour AUC were 27.8 ng/mL and 265 ng.h/mL, respectively, in patients with advanced RCC. The geometric mean oral clearance and apparent volume of distribution were 38 L/h and 160 L, respectively.

Biotransformation and elimination

Axitinib is metabolised primarily in the liver by CYP3A4/5 and to a lesser extent by CYP1A2, CYP2C19, and UGT1A1.

Following oral administration of a 5 mg radioactive dose of axitinib, 30-60% of the radioactivity was recovered in faeces and 23% of the radioactivity was recovered in urine. Unchanged axitinib, accounting for 12% of the dose, was the major component identified in faeces. Unchanged axitinib was not detected in urine; the carboxylic acid and sulfoxide metabolites accounted for the majority of radioactivity in urine. In plasma, the N-glucuronide metabolite represented the predominant radioactive component (50% of circulating radioactivity) and unchanged axitinib and the sulfoxide metabolite each accounted for approximately 20% of the circulating radioactivity.

The sulfoxide and N-glucuronide metabolites show approximately 400-fold and 8000-fold less in vitro potency, respectively, against VEGFR-2 compared to axitinib.

Special populations

Elderly, gender, and race

Population pharmacokinetic analyses in patients with advanced cancer (including advanced RCC) and healthy volunteers indicate that there are no clinically relevant effects of age, gender, body weight, race, renal function, UGT1A1 genotype, or CYP2C19 genotype.

Paediatric population

Axitinib has not been studied in patients < 18 years of age.

Hepatic impairment

In vitro and in vivo data indicate that axitinib is primarily metabolised by the liver.

Compared to subjects with normal hepatic function, systemic exposure following a single dose of axitinib was similar in subjects with mild hepatic impairment (Child-Pugh class A) and higher (approximately two-fold) in subjects with moderate hepatic impairment (Child-Pugh class B).).

Renal impairment

Unchanged axitinib is not detected in the urine.

Axitinib has not been studied in subjects with renal impairment. In clinical studies with axitinib for the treatment of patients with RCC, patients with serum creatinine > 1.5 times the ULN or calculated creatinine clearance < 60 mL/min were excluded. Population pharmacokinetic analyses have shown that axitinib clearance was not altered in subjects with renal impairment and no dose adjustment of axitinib is required.

Repeat dose toxicity

Major toxicity findings in mice and dogs following repeated dosing for up to 9 months were the gastrointestinal, haematopoietic, reproductive, skeletal and dental systems, with No Observed Adverse Effect Levels (NOAEL) approximately equivalent to or below expected human exposure at the recommended clinical starting dose (based on AUC levels).

Carcinogenicity

Carcinogenicity studies have not been performed with axitinib.

Genotoxicity

Axitinib was not mutagenic or clastogenic in conventional genotoxicity assays in vitro. A significant increase in polyploidy was observed in vitro at concentrations > 0.22 µg/mL, and an elevation in micronucleated polychromatic erythrocytes was observed in vivo with No Observed Effect Level (NOEL) 69-fold the expected human exposure. Genotoxicity findings are not considered clinically relevant at exposure levels observed in humans.

Reproduction toxicity

Axitinib-related findings in the testes and epididymis included decreased organ weight, atrophy or degeneration, decreased numbers of germinal cells, hypospermia or abnormal sperm forms, and reduced sperm density and count. These findings were observed in mice at exposure levels approximately 12-fold the expected human exposure, and in dogs at exposure levels below the expected human exposure. There was no effect on mating or fertility in male mice at exposure levels approximately 57-fold the expected human exposure. Findings in females included signs of delayed sexual maturity, reduced or absent corpora lutea, decreased uterine weights and uterine atrophy at exposures approximately equivalent to the expected human exposure. Reduced fertility and embryonic viability were observed in female mice at all doses tested, with exposure levels at the lowest dose approximately 10-fold the expected human exposure.

Pregnant mice exposed to axitinib showed an increased occurrence of cleft palate malformations and skeletal variations, including delayed ossification, at exposure levels below the expected human exposure. Perinatal and postnatal developmental toxicity studies have not been conducted.

Toxicity findings in immature animals

Reversible physeal dysplasia was observed in mice and dogs given axitinib for at least 1 month at exposure levels approximately six-fold higher than the expected human exposure. Partially reversible dental caries were observed in mice treated for more than 1 month at exposure levels similar to the expected human exposure. Other toxicities of potential concern to paediatric patients have not been evaluated in juvenile animals.

Not applicable.

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