Soravar 200

Sorafenib tosilate.

Tablet (film coated).
Red, round, biconvex, bevel-edged, film coated tablets debossed with "H1" on one side and plain on other side.
Each film coated tablet contains: Sorafenib Tosilate Ph. Eur. 274 mg eq. to Sorafenib 200 mg.
Excipients/Inactive Ingredients: Microcrystalline cellulose, Croscarmellose sodium, Hypromellose E5, Sodium lauryl sulfate, Magnesium stearate.
Tablet film-coating: Hypromellose Macrogol (3350), Titanium dioxide (E 171), Iron oxide red (E 172).

Pharmacotherapeutic group: Antineoplastic agents, protein kinase inhibitors. ATC code: L01XE05.
Pharmacology: Pharmacodynamics: Sorafenib is a multikinase inhibitor which has demonstrated both anti-proliferative and anti-angiogenic properties in vitro and in vivo.
Mechanism of action and pharmacodynamic effects: Sorafenib is a multikinase inhibitor that decreases tumour cell proliferation in vitro. Sorafenib inhibits tumour growth of abroad spectrum of human tumour xenografts in athymic mice accompanied by a reduction of tumour angiogenesis.
Sorafenib inhibits the activity of targets present in the tumour cell (CRAF, BRAF, V600E BRAF, c-KIT, and FLT-3) and in the tumour vasculature (CRAF, VEGFR-2, VEGFR-3, and PDGFR-β). RAF kinases areserine/threonine kinases, whereas c-KIT, FLT-3, VEGFR-2, VEGFR-3, and PDGFR-β are receptor tyrosine kinases.
Clinical efficacy: The clinical safety and efficacy of sorafenib have been studied in patients with hepatocellular carcinoma (HCC), in patients with advanced renal cell carcinoma (RCC) and in patients with differentiated thyroid carcinoma (DTC).
Hepatocellular carcinoma: Study 3 (study 100554) was a Phase III, international, multi-centre, randomised, double blind, placebo-controlled study in 602 patients with hepatocellular carcinoma. Demographics and baseline disease characteristics were comparable between the sorafenib and the placebo group with regard to ECOG status (status 0: 54% vs. 54%; status 1: 38% vs. 39%; status 2: 8% vs. 7%), TNM stage (stage I: <1% vs. <1%; stage II: 10.4% vs. 8.3%; stage III: 37.8% vs. 43.6%; stage IV: 50.8% vs. 46.9%), and BCLC stage (stage B: 18.1% vs. 16.8%; stage C: 81.6% vs. 83.2%; stage D: <1% vs. 0%).
The study was stopped after a planned interim analysis of OS had crossed the pre-specified efficacy boundary. This OS analysis showed a statistically significant advantage for sorafenib over placebo for OS (HR: 0.69, p=0.00058, see table 1).
There are limited data from this study in patients with Child Pugh B liver impairment and only one patient with Child Pugh C had been included. (See Table 1.)

Click on icon to see table/diagram/image

A second Phase III, international, multi-centre, randomised, double blind, placebo-controlled study (Study 4, 11849) evaluated the clinical benefit of sorafenib in 226 patients with advanced hepatocellular carcinoma. This study, conducted in China, Korea and Taiwan confirmed the findings of Study 3 with respect to the favourable benefit-risk profile of sorafenib (HR (OS): 0.68, p=0.01414).
In the pre-specified stratification factors (ECOG status, presence or absence of macroscopic vascular invasion and/or extra-hepatic tumour spread) of both Study 3 and 4, the HR consistently favoured sorafenib over placebo. Exploratory subgroup analyses suggested that patients with distant metastases at baseline derived a less pronounced treatment effect.
Renal cell carcinoma: The safety and efficacy of sorafenib in the treatment of advanced renal cell carcinoma (RCC) were investigated in two clinical studies: Study 1 (study 11213) was a Phase III, multi-centre, randomised, double blind, placebo-controlled study in 903 patients.
Only patients with clear cell renal carcinoma and low and intermediate risk MSKCC (Memorial Sloan Kettering Cancer Center) were included. The primary endpoints were overall survival and progression-free survival (PFS).
Approximately half of the patients had an ECOG performance status of 0, and half of the patients were in the low risk MSKCC prognostic group.
PFS was evaluated by blinded independent radiological review using RECIST criteria. The PFS analysis was conducted at 342 events in 769 patients. The median PFS was 167 days for patients randomised to sorafenib compared to 84 days for placebo patients (HR=0.44; 95% CI: 0.35-0.55; p <0.000001). Age, MSKCC prognostic group, ECOG PS and prior therapy did not affect the treatment effect size.
An interim analysis (second interim analysis) for overall survival was conducted at 367 deaths in 903 patients. The nominal alpha value for this analysis was 0.0094. The median survival was 19.3 months for patients randomised to sorafenib compared to 15.9 months for placebo patients (HR=0.77; 95% CI: 0.63-0.95; p=0.015). At the time of this analysis, about 200 patients had crossed-over to sorafenib from the placebo group.
Study 2 was a Phase II, discontinuation study in patients with metastatic malignancies, including RCC. Patients with stable disease on therapy with sorafenib were randomised to placebo or continued sorafenib therapy. Progression-free survival in patients with RCC was significantly longer in the sorafenib group (163 days) than in the placebo group (41 days) (p=0.0001, HR=0.29).
Differentiated thyroid carcinoma (DTC): Study 5 (study 14295) was a Phase III, international, multi-centre, randomised, double blind, placebo-controlled trial in 417 patients with locally advanced or metastatic DTC refractory to radioactive iodine. Progression-free survival (PFS) as evaluated by a blinded independent radiological review using RECIST criteria was the primary endpoint of the study.
Secondary endpoints included overall survival (OS), tumour response rate and duration of response. Following progression, patients were allowed to receive open label sorafenib.
Patients were included in the study if they experienced progression within 14 months of enrollment and had DTC refractory to radioactive iodine (RAI). DTC refractory to RAI was defined as having a lesion without iodine uptake on a RAI scan, or receiving cumulative RAI ≥22.2 GBq, or experiencing a progression after a RAI treatment within 16 months of enrollment or after two RAI treatments within 16 months of each other.
Baseline demographics and patient characteristics were well balanced for both treatment groups. Metastases were present in the lungs in 86%, lymph node in 51% and bone in 27% of the patients. The median delivered cumulative radioactive iodine activity before enrollment was approximately 14.8 GBq. Majority of patients had papillary carcinoma (56.8%), followed by follicular (25.4%) and poorly differentiated carcinoma (9.6%).
Median PFS time was 10.8 months in the sorafenib group compared to 5.8 months in the placebo group (HR=0.587; 95% Confidence Interval (CI): 0.454, 0.758; one-sided p <0.0001).
The effect of sorafenib on PFS was consistent independent of geographic region, age above or below 60 years, gender, histological subtype, and presence or absence of bone metastasis.
In an overall survival analysis conducted 9 months after the data cut-off for the final PFS analysis there was no statically significant difference in overall survival between the treatment groups (HR=0.884; 95% CI: 0.633, 1.236, one-sided p value of 0.236). The median OS was not reached in the sorafenib arm and was 36.5 months in the placebo arm. One hundred fifty seven (75%) patients randomised to placebo and 61 (30%) patients randomised to sorafenib received open-label sorafenib.
The median duration of therapy in the double-blind period was 46 weeks (range 0.3-135) for patients receiving sorafenib and 28 weeks (range 1.7-132) for patients receiving placebo.
No complete response (CR) according to RECIST was observed. The overall response rate (CR + partial response (PR) per independent radiological assessment was higher in the sorafenib group (24 patients, 12.2%) than in the placebo group (1 patient, 0.5%), one-sided p<0.0001. The median duration of response was 309 days (95% CI: 226, 505 days) in sorafenib treated patients who experienced a PR.
A post-hoc subgroup analysis by maximum tumour size showed a treatment effect for PFS in favour of sorafenib over placebo for patients with maximum tumour size of 1.5 cm or larger (HR 0.54 (95% CI: 0.41-0.71)) whereas a numerically lower effect was reported in patients with a maximum tumour size of less than 1.5 cm (HR 0.87 (95% CI: 0.40-1.89).
A post-hoc subgroup analysis by thyroid carcinoma symptoms at baseline showed a treatment effect for PFS in favour of sorafenib over placebo for both symptomatic and asymptomatic patients. The HR of progression free survival was 0.39 (95% CI: 0.21-0.72) for patients with symptoms at baseline and 0.60 (95% CI: 0.45-0.81) for patients without symptoms at baseline.
QT interval prolongation: In a clinical pharmacology study, QT/QTc measurements were recorded in 31 patients at baseline (pre-treatment) and post-treatment. After one 28-day treatment cycle, at the time of maximum concentration of sorafenib, QTcB was prolonged by 4 ±19 msec and QTcF by 9±18 msec, as compared to placebo treatment at baseline. No subject showed aQTcB or QTcF >500 msec during the post-treatment ECG monitoring.
Paediatric population: The European Medicines Agency has waived the obligation to submit the results of studies, in all subsets of the paediatric population, in kidney and renal pelvis carcinoma (excluding nephroblastoma, nephroblastomatosis, clear cell sarcoma, mesoblasticnephroma, renal medullary carcinoma and rhabdoid tumour of the kidney) and liver and intrahepatic bile duct carcinoma (excluding hepatoblastoma) and differentiated thyroid carcinoma.
Pharmacokinetics: Absorption and distribution: After administration of sorafenib tablets the mean relative bioavailability is 38-49% when compared to an oral solution.
The absolute bioavailability is not known. Following oral administration sorafenib reaches peak plasma concentrations in approximately 3 hours. When given with a high-fat meal sorafenib absorption was reduced by 30% compared to administration in the fasted state.
Mean Cmax and AUC increased less than proportionally beyond doses of 400 mg administered twice daily. In vitro binding of sorafenib to human plasma proteins is 99.5%.
Multiple dosing of sorafenib for 7 days resulted in a 2.5- to 7-fold accumulation compared to single dose administration.
Steady state plasma sorafenib concentrations are achieved within 7 days, with a peak to trough ratio of mean concentrations of less than 2.
The steady-state concentrations of sorafenib administered at 400 mg twice daily were evaluated in DTC, RCC and HCC patients. The highest mean concentration was observed in DTC patients (approximately twice that observed in patients with RCC and HCC), though variability was high for all tumour types. The reason for the increased concentration in DTC patients is unknown.
Biotransformation and elimination: The elimination half-life of sorafenib is approximately 25-48 hours. Sorafenib is metabolised primarily in the liver and undergoes oxidative metabolism, mediated by CYP 3A4, as well as glucuronidation mediated by UGT1A9. Sorafenib conjugates may be cleaved in the gastrointestinal tract by bacterial glucuronidase activity, allowing reabsorption of unconjugated active substance. Co-administration of neomycin has been shown to interfere with this process, decreasing the mean bioavailability of sorafenib by 54%.
Sorafenib accounts for approximately 70-85% of the circulating analytes in plasma at steady state. Eight metabolites of sorafenib have been identified, of which five have been detected in plasma. The main circulating metabolite of sorafenib in plasma, the pyridine N-oxide, shows in vitro potency similar to that of sorafenib. This metabolite comprises approximately 9-16% of circulating analytes at steady state.
Following oral administration of a 100 mg dose of a solution formulation of sorafenib, 96% of the dose was recovered within 14 days, with 77% of the dose excreted in faeces, and 19% of the dose excreted in urine as glucuronidated metabolites. Unchanged sorafenib, accounting for 51% of the dose, was found in faeces but not in urine, indicating that biliary excretion of unchanged active substance might contribute to the elimination of sorafenib.
Pharmacokinetics in special populations: Analyses of demographic data suggest that there is no relationship between pharmacokinetics and age (up to 65 years), gender or body weight.
Paediatric population: No studies have been conducted to investigate the pharmacokinetics of sorafenib in paediatric patients.
Race: There are no clinically relevant differences in pharmacokinetics between Caucasian and Asian subjects.
Renal impairment: In four Phase I clinical trials, steady state exposure to sorafenib was similar in patients with mild or moderate renal impairment compared to the exposures in patients with normal renal function. In a clinical pharmacology study (single dose of 400 mg sorafenib), no relationship was observed between sorafenib exposure and renal function in subjects with normal renal function, mild, moderate or severe renal impairment. No data is available in patients requiring dialysis.
Hepatic impairment: In hepatocellular carcinoma (HCC) patients with Child-Pugh A or B (mild to moderate) hepatic impairment, exposure values were comparable and within the range observed in patients without hepatic impairment. The pharmacokinetics (PK) of sorafenib in Child-Pugh A and B non-HCC patients were similar to the PK in healthy volunteers. There are no data for patients with Child-Pugh C (severe) hepatic impairment. Sorafenib is mainly eliminated via the liver, and exposure might be increased in this patient population.

Hepatocellular carcinoma: Sorafenib is indicated for the treatment of hepatocellular carcinoma.
Renal cell carcinoma: Sorafenib is indicated for the treatment of patients with advanced renal cell carcinoma who have failed prior interferon-alpha or interleukin-2 based therapy or are considered unsuitable for such therapy.
Differentiated thyroid carcinoma: Sorafenib is indicated for the treatment of patients with progressive, locally advanced or metastatic, differentiated (papillary/follicular/Hürthle cell) thyroid carcinoma, refractory to radioactive iodine.

Sorafenib treatment should be supervised by a physician experienced in the use of anticancer therapies.
Posology: The recommended dose of Sorafenib in adults is 400 mg sorafenib (two tablets of 200 mg) twice daily (equivalent to a total daily dose of 800 mg).
Treatment should continue as long as clinical benefit is observed or until unacceptable toxicity occurs.
Posology adjustments: Management of suspected adverse drug reactions may require temporary interruption or dose reduction of Sorafenib therapy.
When dose reduction is necessary during the treatment of hepatocellular carcinoma (HCC) and advanced renal cell carcinoma (RCC), the Sorafenib dose should be reduced to two tablets of 200 mg sorafenib once daily.
When dose reduction is necessary during the treatment of differentiated thyroid carcinoma (DTC), the Sorafenib dose should be reduced to 600 mg sorafenib daily in divided doses (two tablets of 200 mg and one tablet of 200 mg twelve hours apart).
If additional dose reduction is necessary, Sorafenib may be reduced to 400 mg sorafenib daily in divided doses (two tablets of 200 mg twelve hours apart), and if necessary further reduced to one tablet of 200 mg once daily. After improvement of non-haematological adverse reactions, the dose of Sorafenib may be increased.
Paediatric population: The safety and efficacy of Sorafenib in children and adolescents aged <18 years have not yet been established. No data are available.
Elderly population: No dose adjustment is required in the elderly (patients above 65 years of age).
Renal impairment: No dose adjustment is required in patients with mild, moderate or severe renal impairment. No data is available in patients requiring dialysis.
Monitoring of fluid balance and electrolytes in patients at risk of renal dysfunction is advised.
Hepatic impairment: No dose adjustment is required in patients with Child Pugh A or B (mild to moderate) hepatic impairment. No data is available on patients with Child Pugh C (severe) hepatic impairment.
Method of administration: For oral use.
It is recommended that sorafenib should be administered without food or with a low or moderate fat meal. If the patient intends to have a high-fat meal, sorafenib tablets should be taken at least 1 hour before or 2 hours after the meal. The tablets should be swallowed with a glass of water.

There is no specific treatment for sorafenib overdose. The highest dose of sorafenib studied clinically is 800 mg twice daily. The adverse events observed at this dose were primarily diarrhoea and dermatological events. In the event of suspected overdose sorafenib should be withheld and supportive care instituted where necessary.

Hypersensitivity to the active substance or to any of the excipients listed in Description.

Dermatological toxicities: Hand foot skin reaction (palmar-plantar erythrodysaesthesia) and rash represent the most common adverse drug reactions with sorafenib. Rash and hand foot skin reaction are usually CTC (Common Toxicity Criteria) Grade 1 and 2 and generally appear during the first six weeks of treatment with sorafenib. Management of dermatological toxicities may include topical therapies for symptomatic relief, temporary treatment interruption and/or dose modification of sorafenib, or in severe or persistent cases, permanent discontinuation of sorafenib.
Hypertension: An increased incidence of arterial hypertension was observed in sorafenib-treated patients. Hypertension was usually mild to moderate, occurred early in the course of treatment, and was amenable to management with standard antihypertensive therapy. Blood pressure should be monitored regularly and treated, if required, in accordance with standard medical practice. In cases of severe or persistent hypertension, or hypertensive crisis despite institution of antihypertensive therapy, permanent discontinuation of sorafenib should be considered.
Aneurysms and artery dissections: The use of VEGF pathway inhibitors in patients with or without hypertension may promote the formation of aneurysms and/or artery dissections. Before initiating Sorafenib, this risk should be carefully considered in patients with risk factors such as hypertension or history of aneurysm.
Hypoglycaemia: Decreases in blood glucose, in some cases clinically symptomatic and requiring hospitalization due to loss of consciousness, have been reported during sorafenib treatment. In case of symptomatic hypoglycaemia, sorafenib should be temporarily interrupted. Blood glucose levels in diabetic patients should be checked regularly in order to assess if anti-diabetic medicinal product's dosage needs to be adjusted.
Haemorrhage: An increased risk of bleeding may occur following sorafenib administration. If any bleeding event necessitates medical intervention it is recommended that permanent discontinuation of sorafenib should be considered.
Cardiac ischaemia and/or infarction: In a randomised, placebo-controlled, double-blind study the incidence of treatment-emergent cardiac ischaemia/infarction events was higher in the sorafenib group (4.9%) compared with the placebo group (0.4%).
In study 3 the incidence of treatment-emergent cardiac ischaemia/infarction events was 2.7% in sorafenib patients compared with 1.3% in the placebo group. Patients with unstable coronary artery disease or recent myocardial infarction were excluded from these studies. Temporary or permanent discontinuation of sorafenib should be considered in patients who develop cardiac ischaemia and/or infarction.
QT interval prolongation: Sorafenib has been shown to prolong the QT/QTc interval, which may lead to an increased risk for ventricular arrhythmias. Use sorafenib with caution in patients who have, or may develop prolongation of QTc, such as patients with a congenital long QT syndrome, patients treated with a high cumulative dose of anthracycline therapy, patients taking certain anti-arrhythmic medicines or other medicinal products that lead to QT prolongation, and those with electrolyte disturbances such as hypokalaemia, hypocalcaemia, or hypomagnesaemia. When using sorafenib in these patients, periodic monitoring with on-treatment electrocardiograms and electrolytes (magnesium, potassium, calcium) should be considered.
Gastrointestinal perforation: Gastrointestinal perforation is an uncommon event and has been reported in less than 1% of patients taking sorafenib. In some cases this was not associated with apparent intra-abdominal tumour. Sorafenib therapy should be discontinued.
Hepatic impairment: No data is available on patients with Child Pugh C (severe) hepatic impairment. Since sorafenib is mainly eliminated via the hepatic route exposure might be increased in patients with severe hepatic impairment.
Warfarin co-administration: In frequent bleeding events or elevations in the International Normalised Ratio (INR) have been reported in some patients taking warfarin while on sorafenib therapy. Patients taking concomitant warfarin or phenprocoumon should be monitored regularly for changes in prothrombin time, INR or clinical bleeding episodes.
Wound healing complications: No formal studies of the effect of sorafenib on wound healing have been conducted. Temporary interruption of sorafenib therapy is recommended for precautionary reasons in patients undergoing major surgical procedures. There is limited clinical experience regarding the timing of reinitiation of therapy following major surgical intervention. Therefore, the decision to resume sorafenib therapy following a major surgical intervention should be based on clinical judgement of adequate wound healing.
Drug-drug interactions: Caution is recommended when administering sorafenib with compounds that are metabolised/eliminated predominantly by the UGT1A1 (e.g. irinotecan) or UGT1A9 pathways.
Caution is recommended when sorafenib is co-administered with docetaxel.
Co-administration of neomycin or other antibiotics that cause major ecological disturbances of the gastrointestinal micro-flora may lead to a decrease in sorafenib bioavailability. The risk of reduced plasma concentrations of sorafenib should be considered before starting a treatment course with antibiotics.
Higher mortality has been reported in patients with squamous cell carcinoma of the lung treated with sorafenib in combination with platinum-based chemotherapies. In two randomised trials investigating patients with Non-Small Cell Lung Cancer in the subgroup of patients with squamous cell carcinoma treated with sorafenib as add-on to paclitaxel/carboplatin, the HR for overall survival was found to be 1.81 (95% CI 1.19; 2.74) and as add-on to gemcitabine/cisplatin 1.22 (95% CI 0.82; 1.80). No single cause of death dominated, but higher incidence of respiratory failure, hemorrhages and infectious adverse events were observed in patients treated with sorafenib as add-on to platinum-based chemotherapies.
Disease specific warnings: Differentiated thyroid cancer (DTC): Before initiating treatment, physicians are recommended to carefully evaluate the prognosis in the individual patient considering maximum lesion size, symptoms related to the disease and progression rate.
Management of suspected adverse drug reactions may require temporary interruption or dose reduction of sorafenib therapy. In study 5, 37% of subjects had dose interruption and 35% had dose reduction already in cycle 1 of sorafenib treatment.
Dose reductions were only partially successful in alleviating adverse reactions. Therefore repeat evaluations of benefit and risk is recommended taking anti-tumour activity and tolerability into account.
Haemorrhage in DTC: Due to the potential risk of bleeding, tracheal, bronchial, and oesophageal infiltration should be treated with localized therapy prior to administering sorafenib in patients with DTC.
Hypocalcaemia in DTC: When using sorafenib in patients with DTC, close monitoring of blood calcium level is recommended. In clinical trials, hypocalcaemia was more frequent and more severe in patients with DTC, especially with a history of hypoparathyroidism, compared to patients with renal cell or hepatocellular carcinoma. Hypocalcaemia grade 3 and 4 occurred in 6.8% and 3.4% of sorafenib-treated patients with DTC. Severe hypocalcaemia should be corrected to prevent complications such as QT-prolongation or torsade de pointes (see QT interval prolongation previously).
TSH suppression in DTC: In study 5, increases in TSH levels above 0.5 mU/L were observed in sorafenib treated patients. When using sorafenib in DTC patients, close monitoring of TSH level is recommended.
Renal cell carcinoma: High Risk Patients, according to MSKCC (Memorial Sloan Kettering Cancer Center) prognostic group, were not included in the phase III clinical study in renal cell carcinoma, and benefit-risk in these patients has not been evaluated.
Information about excipients: This medicine contains less than 1 mmol sodium (23 mg) per dose that is to say essentially "sodium free".
Effects on ability to drive and use machines: No studies on the effects on the ability to drive and use machines have been performed. There is no evidence that sorafenib affects the ability to drive or to operate machinery.
Use in the Elderly: Cases of renal failure have been reported. Monitoring of renal function should be considered.

Pregnancy: There are no data on the use of sorafenib in pregnant women. Studies in animals have shown reproductive toxicity including malformations. In rats, sorafenib and its metabolites were demonstrated to cross the placenta and sorafenib is anticipated to cause harmful effects on the foetus. Sorafenib should not be used during pregnancy unless clearly necessary, after careful consideration of the needs of the mother and the risk to the foetus.
Women of childbearing potential must use effective contraception during treatment.
Lactation: It is not known whether sorafenib is excreted in human milk. In animals, sorafenib and/or its metabolites were excreted in milk. Because sorafenib could harm infant growth and development, women must not breast-feed during sorafenib treatment.
Fertility: Results from animal studies further indicate that sorafenib can impair male and female fertility.

The most important serious adverse reactions were myocardial infarction/ischaemia, gastrointestinal perforation, drug induced hepatitis, haemorrhage, and hypertension/hypertensive crisis.
The most common adverse reactions were diarrhoea, fatigue, alopecia, infection, hand foot skin reaction (corresponds to palmar plantar erythrodysaesthesia syndrome in MedDRA) and rash.
Adverse reactions reported in multiple clinical trials or through post-marketing use are listed as follows in table 2, by system organ class (in MedDRA) and frequency. 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, undesirable effects are presented in order of decreasing seriousness. (See Table 2.)

Click on icon to see table/diagram/image

Further information on selected adverse drug reactions: Congestive heart failure: In company sponsored clinical trials congestive heart failure was reported as an adverse event in 1.9% of patients treated with sorafenib (N=2276). In study 11213 (RCC) adverse events consistent with congestive heart failure were reported in 1.7% of patients treated with sorafenib and 0.7% receiving placebo. In study 100554 (HCC), 0.99% of those treated with sorafenib and 1.1% receiving placebo were reported with these events.

Inducers of metabolic enzymes: Administration of rifampicin for 5 days before administration of a single dose of sorafenib resulted in an average 37% reduction of sorafenib AUC. Other inducers of CYP3A4 activity and/or glucuronidation (e.g. Hypericum perforatum also known as St. John's wort, phenytoin, carbamazepine, phenobarbital, and dexamethasone) may also increase metabolism of sorafenib and thus decrease sorafenib concentrations.
CYP3A4 inhibitors: Ketoconazole, a potent inhibitor of CYP3A4, administered once daily for 7 days to healthy male volunteers did not alter the mean AUC of a single 50 mg dose of sorafenib. These data suggest that clinical pharmacokinetic interactions of sorafenib with CYP3A4 inhibitors are unlikely.
CYP2B6, CYP2C8 and CYP2C9 substrates: Sorafenib inhibited CYP2B6, CYP2C8 and CYP2C9 in vitro with similar potency. However, in clinical pharmacokinetic studies, concomitant administration of sorafenib 400 mg twice daily with cyclophosphamide, a CYP2B6 substrate, or paclitaxel, a CYP2C8 substrate, did not result in a clinically meaningful inhibition. These data suggest that sorafenib at the recommended dose of400 mg twice daily may not be an in vivo inhibitor of CYP2B6 or CYP2C8.
Additionally, concomitant treatment with sorafenib and warfarin, a CYP2C9 substrate, did not result in changes in mean PT-INR compared to placebo. Thus, also the risk for a clinically relevant in vivo inhibition of CYP2C9 by sorafenib may be expected to be low. However, patients taking warfarin or phenprocoumon should have their INR checked regularly.
CYP3A4, CYP2D6 and CYP2C19 substrates: Concomitant administration of sorafenib and midazolam, dextromethorphan or omeprazole, which are substrates for cytochromes CYP3A4, CYP2D6 and CYP2C19 respectively, did not alter the exposure of these agents. This indicates that sorafenib is neither an inhibitor nor an inducer of these cytochrome P450 isoenzymes. Therefore, clinical pharmacokinetic interactions of sorafenib with substrates of these enzymes are unlikely.
UGT1A1 and UGT1A9 substrates: In vitro, sorafenib inhibited glucuronidation via UGT1A1 and UGT1A9. The clinical relevance of this finding is unknown.
In vitro studies of CYP enzyme induction: CYP1A2 and CYP3A4 activities were not altered after treatment of cultured human hepatocytes with sorafenib, indicating that sorafenib is unlikely to be an inducer of CYP1A2 and CYP3A4.
P-gp-substrates: In vitro, sorafenib has been shown to inhibit the transport protein p-glycoprotein (P-gp). Increased plasma concentrations of P-gp substrates such as digoxin cannot be excluded with concomitant treatment with sorafenib.
Combination with other anti-neoplastic agents: In clinical studies sorafenib has been administered with a variety of other anti-neoplastic agents at their commonly used dosing regimens including gemcitabine, cisplatin, oxaliplatin, paclitaxel, carboplatin, capecitabine, doxorubicin, irinotecan, docetaxel and cyclophosphamide. Sorafenib had no clinically relevant effect on the pharmacokinetics of gemcitabine, cisplatin, carboplatin, oxaliplatin or cyclophosphamide.
Paclitaxel/carboplatin: Administration of paclitaxel (225 mg/m²) and carboplatin (AUC=6) with sorafenib (≤400 mg twice daily), administered with a 3-day break in sorafenib dosing (two days prior to and on the day of paclitaxel/carboplatin administration), resulted in no significant effect on the pharmacokinetics of paclitaxel.
Co-administration of paclitaxel (225 mg/m², once every 3 weeks) and carboplatin (AUC=6) with sorafenib (400 mg twice daily, without a break in sorafenib dosing) resulted in a 47% increase in sorafenib exposure, a 29% increase in paclitaxel exposure and a 50% increase in 6-OH paclitaxel exposure. The pharmacokinetics of carboplatin were unaffected.
These data indicate no need for dose adjustments when paclitaxel and carboplatin are co-administered with sorafenib with a 3-day break in sorafenib dosing (two days prior to and on the day of paclitaxel/carboplatin administration). The clinical significance of the increases in sorafenib and paclitaxel exposure, upon co-administration of sorafenib without a break in dosing, is unknown.
Capecitabine: Co-administration of capecitabine (750-1050 mg/m² twice daily, Days 1-14 every 21 days) and sorafenib (200 or 400 mg twice daily, continuous uninterrupted administration) resulted in no significant change in sorafenib exposure, but a 15-50% increase in capecitabine exposure and a 0-52% increase in 5-FU exposure. The clinical significance of these small to modest increases in capecitabine and 5-FU exposure when co-administered with sorafenib is unknown.
Doxorubicin/Irinotecan: Concomitant treatment with sorafenib resulted in a 21% increase in the AUC of doxorubicin. When administered with irinotecan, whose active metabolite SN-38 is further metabolised by the UGT1A1 pathway, there was a 67-120% increase in the AUC of SN-38 and a 26-42% increase in the AUC of irinotecan. The clinical significance of these findings is unknown.
Docetaxel: Docetaxel (75 or 100 mg/m² administered once every 21 days) when co-administered with sorafenib (200 mg twice daily or 400 mg twice daily administered on Days 2 through 19 of a 21-day cycle with a 3-day break in dosing around administration of docetaxel) resulted in a 36-80% increase in docetaxel AUC and a 16-32% increase in docetaxel Cmax.
Caution is recommended when sorafenib is co-administered with docetaxel.
Combination with other agents: Neomycin: Co-administration of neomycin, a non-systemic antimicrobial agent used to eradicate gastrointestinal flora, interferes with the entero-hepatic recycling of sorafenib, resulting in decreased sorafenib exposure. In healthy volunteers treated with a 5-day regimen of neomycin the average exposure to sorafenib decreased by 54%. Effects of other antibiotics have not been studied, but will likely depend on their ability to interfere with microorganisms with glucuronidase activity.

Store at temperature not exceeding 30°C.

Targeted Cancer Therapy

L01EX02 - sorafenib ; Belongs to the class of other protein kinase inhibitors. Used in the treatment of cancer.

Rx