Oncology Drug Iressa Better Than Chemotherapy In Some Patients, According To New Report From Cutting Edge Information
Main Category: Cancer / OncologyAlso Included In: Pharma Industry / Biotech Industry
Article Date: 11 Dec 2008 - 5:00 PDT
Iressa's sales are poised to increase on positive clinical results suggesting that AstraZeneca's targeted lung cancer therapy performs better than standard chemotherapy in many patients, according to a new report, "Oncology Market Forecast to 2013", published by pharmaceutical business intelligence leader Cutting Edge Information.
Iressa's positive clinical trial results will shift prescriptions away from current market leader Tarceva and back to Iressa, according to CEI. However, analysts expect that Iressa's annual sales will only increase to $300 million unless the FDA unrestricts access to the drug for new patients.
The recent study led by Dr. Edward Kim of the M. D. Anderson Cancer Center, however, points to new life for Iressa. Though Iressa prolongs life 7.6 months on average compared to chemotherapy's 8 months, Iressa presents fewer -- but also less severe -- side effects.
Even more promising, when researchers focused on only those patients exhibiting an EFGR gene mutation, life expectancy in patients taking EFGR inhibitor Iressa increased to 8.4 months, whereas those taking docetaxel decreased to 7.5 months.
"Not only are patients' quality of life better with Iressa, but the drug also extends life expectancy," says Eric Bolesh, research manager at Cutting Edge Information. "That's a powerful combination for oncology treatments."
Oncologists now have the option to prescribe the convenient pill-based therapy Iressa instead of traditional chemotherapy in patients who have not responded well to initial chemotherapy. Cutting Edge Information expects a gradual increase in Iressa's sales from $258 million to nearly $300 million as physicians slowly respond to recent clinical results.
But Bolesh cautions, "Too many negative results in the past will dampen Iressa's sales growth. Some physicians will be leery of automatically shifting their patients away from traditional therapies on the basis of only one study."
Cutting Edge Information's report examines 130-plus oncology brands and provides the following market analysis:
- Individual Drug Profiles - Drug profiles include information about drugs' competitive, strategic and market growth positions.
- Oncology Indication Market Outlook - Detailed outlooks for the breast, colorectal, lung and prostate cancer, and leukemia markets.
- Drug Manufacturer Profiles - Pipeline and portfolio analyses for companies that either have established oncology franchises or exciting development pipelines for new cancer compounds.
Cutting Edge Information
Visit our cancer / oncology section for the latest news on this subject.
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Iressa Better Than Chemotherapy In Some Patients
posted by Gregory D. Pawelski on 12 Dec 2008 at 9:20 amThe cancer drug Iressa actually does work miracles, in some patients. Cell culture analysis has been able to find the cellular signal for response to the drug and can identify clinical responders - prospectively.
The Iressa situation is a great argument for pre-screening an individual's tumor. Iressa has been shown to benefit those that are benefitting from it. If the drug is working for some people, then obviously there are others out there who would also benefit. Who are those that benefit from its use? All the more reason to test the tumor first.
Assay-directed therapy is an individualized approach to killing cancer. The bio-marker method is used to determine what precise medications would kill the particular cancer. Doctors have assumed that stopping cell division would stop cancer, because most cancer cells divide and grow rapidly. But the approach didn't always kill the malignant cells. Cancer isn't a case of cells growing out of control, but of cells refusing to die on schedule.
By inhibiting anti-apoptosis with Iressa (small molecule inhibitor of tyrosine kinase, a key intermediary in the EGF cascade pathway), the cells undergo apoptosis and die. This can be detected at the whole cell level and reported out prospectively. It is a unique tool for identifying newer, better drugs, testing drug combinations, and serving as a "gold standard" to develop new DNA, RNA, and protein-based tests of drug activity.
The EGF system is a target for a number of newer anti-cancer drugs. However, EGF-targeted drugs like Iressa are poorly-predicted by measuring the ostensible target (EGFR), but can be well-predicted by measuring the effect of the drugs on the "function" of live cells. It is an area of cancer research which has been abandoned by the entire cancer research establishment. A bioengineering problem overcomed by a band of private-lab cell biologists.
More and more physicians and patients are turning to individualized therapies to treat cancers. Under this approach, scientists study how an individual's cancerous cells respond to several drugs. Doctors have learned that even when the disease is the same type, different patients' tumors respond differently to chemotherapeutic drugs. Without individualized testing, it's difficult to determine which drugs are best for patients who don't respond to standard therapies.
There are over numerous different therapeutic drug regimens out there. Any one or combination of them can help cancer patients. The system is overloaded with drugs and under loaded with wisdom and expertise for using them. What's needed is to make extensive use of bio-marker tests in treatment decisions.
Literature Citation: Journal of Clinical Oncology, 2006 ASCO Annual Meeting Proceedings Part I. Vol 24, No. 18S (June 20 Supplement), 2006: 17117
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