Sorafenib (co-developed and co-marketed by Bayer and Onyx Pharmaceuticals as Nexavar), is a kinase inhibitor drug approved for the treatment of primary kidney cancer (advanced renal cell carcinoma), advanced primary liver cancer (hepatocellular carcinoma), and radioactive iodine resistant advanced thyroid carcinoma.
Video Sorafenib
Mechanism of action
Sorafenib is a small inhibitor of several tyrosine protein kinases, such as VEGFR, PDGFR and Raf family kinases (more avidly C-Raf than B-Raf).
(See BRAF (gene)#Sorafenib for details of drug structure interaction with B-Raf.)
Sorafenib treatment induces autophagy, which may suppress tumor growth. However, autophagy can also cause drug resistance.
Maps Sorafenib
Medical uses
At the current time sorafenib is indicated as a treatment for advanced renal cell carcinoma (RCC), unresectable hepatocellular carcinomas (HCC) and thyroid cancer.
Kidney cancer
Clinical trial results, published January 2007, showed that, compared with placebo, treatment with sorafenib prolongs progression-free survival in patients with advanced clear cell renal cell carcinoma in whom previous therapy has failed. The median progression-free survival was 5.5 months in the sorafenib group and 2.8 months in the placebo group (hazard ratio for disease progression in the sorafenib group, 0.44; 95% confidence interval [CI], 0.35 to 0.55; P<0.01).
In Australia this is one of two TGA-labelled indications for sorafenib, although it is not listed on the Pharmaceutical Benefits Scheme for this indication.
Liver cancer
At ASCO 2007, results from the SHARP trial were presented, which showed efficacy of sorafenib in hepatocellular carcinoma. The primary endpoint was median overall survival, which showed a 44% improvement in patients who received sorafenib compared to placebo (hazard ratio 0.69; 95% CI, 0.55 to 0.87; p=0.0001). Both median survival and time to progression showed 3-month improvements; however, there was no significant difference in median time to symptomatic progression (p=0.77). There was no difference in quality of life measures, possibly attributable to toxicity of sorafenib or symptoms related to underlying progression of liver disease. Of note, this trial only included patients with Child-Pugh Class A (i.e. mildest) cirrhosis. Because of this trial Sorafenib obtained FDA approval for the treatment of advanced hepatocellular carcinoma in November 2007.
In a randomized, double-blind, phase II trial combining sorafenib with doxorubicin, the median time to progression was not significantly delayed compared with doxorubicin alone in patients with advanced hepatocellular carcinoma. Median durations of overall survival and progression-free survival were significantly longer in patients receiving sorafenib plus doxorubicin than in those receiving doxorubicin alone.
A prospective single-centre phase II study which included the patients with unresectable hepatocellular carcinoma (HCC)concluding that the combination of sorafenib and DEB-TACE in patients with unresectable HCC is well tolerated and safe, with most toxicities related to sorafenib.
In Australia this is the only indication for which sorafenib is listed on the PBS and hence the only Government-subsidised indication for sorafenib. Along with renal cell carcinoma, hepatocellular carcinoma is one of the TGA-labelled indications for sorafenib.
Thyroid cancer
On November 22, 2013, sorafenib was approved by the FDA for the treatment of locally recurrent or metastatic, progressive differentiated thyroid carcinoma (DTC) refractory to radioactive iodine treatment.
The Phase 3 DECISION trial showed significant improvement in progression-free survival but not in overall survival. However, as is known, the side effects were very frequent, specially hand and foot skin reaction.
Desmoid tumors
A phase 3 clinical trial is under way testing the effectiveness of Sorafenib to treat desmoid tumors (also known as aggressive fibromatosis), after positive results in the first two trial stages. Dosage is typically half of that applied for malignant cancers (400 mg vs 800 mg). NCI are sponsoring this trial.
Adverse effects
Adverse effects by frequency
Note: Potentially serious side effects are in bold.
Very common (>10% frequency)
Common (1-10% frequency)
- Transient increase in transaminase
Uncommon (0.1-1% frequency)
Rare (0.01-0.1% frequency)
History
Renal cancer
Sorafenib was approved by the U.S. Food and Drug Administration (FDA) in December 2005, and received European Commission marketing authorization in July 2006, both for use in the treatment of advanced renal cancer.
Liver cancer
The European Commission granted marketing authorization to the drug for the treatment of patients with hepatocellular carcinoma(HCC), the most common form of liver cancer, in October 2007, and FDA approval for this indication followed in November 2007.
In November 2009, the UK's National Institute of Clinical Excellence declined to approve the drug for use within the NHS in England, Wales and Northern Ireland, stating that its effectiveness (increasing survival in primary liver cancer by 6 months) did not justify its high price, at up to £3000 per patient per month. In Scotland the drug had already been refused authorization by the Scottish Medicines Consortium for use within NHS Scotland, for the same reason.
In March 2012, the Indian Patent Office granted a domestic company, Natco Pharma, a license to manufacture generic Sorafenib, bringing its price down by 97%. Bayer sells a month's supply, 120 tablets, of Nexavar forINR280,000 (US$4,400). Natco Pharma will sell 120 tablets for INR8,800 (US$140), while still paying a 6% royalty to Bayer. The royalty was later raised to 7% on appeal by Bayer. Under Indian Patents Act, 2005 and the World Trade Organisation TRIPS Agreement, the government can issue a compulsory license when a drug is not available at an affordable price.
Thyroid cancer
On November 22, 2013, sorafenib was approved by the FDA for the treatment of locally recurrent or metastatic, progressive differentiated thyroid carcinoma (DTC) refractory to radioactive iodine treatment.
Research
Lung
In some kinds of lung cancer (with squamous-cell histology) sorafenib administered in addition to paclitaxel and carboplatin may be detrimental to patients.
Brain (recurrent glioblastoma)
There is a phase I/II study at the Mayo Clinic of sorafenib and CCI-779 (temsirolimus) for recurrent glioblastoma.
Desmoid tumor (aggressive fibromatosis)
A study performed in 2011 showed that Sorafenib is active against aggressive fibromatosis. This study is being used as justification for using Sorafenib as an initial course of treatment in some patients with aggressive fibromatosis.
Nexavar controversy
In January 2014, Bayer's CEO stated that Nexavar was developed for "western patients who [could] afford it". At the prevailing prices, a kidney cancer patient would pay $96,000 (£58,000) for a year's course of the Bayer-made drug. However, the cost of the Indian version of the generic drug would be around $2,800 (£1,700).
Notes
References
External links
- Nexavar.com - Manufacturer's website
- Prescribing Information - includes data from the key studies justifying the use of sorafenib for the treatment of kidney cancer (particularly clear cell renal cell carcinoma, which is associated with the von Hippel-Lindau gene)
- Patient Information from FDA
- Sorafenib in Treating Patients With Soft Tissue Sarcomas
- Sorafenib Sunitinib differences - diagram
- Clinical trial number NCT00217399 at ClinicalTrials.gov - Sorafenib and Anastrozole in Treating Postmenopausal Women With Metastatic Breast Cancer
- Cipla launches Nexavar generic at 1/10 of Bayer's price
Source of the article : Wikipedia
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