Wednesday, May 31, 2006

Thromboembolism risk reduction in multiple myeloma patients

Thromboembolism risk reduction in multiple myeloma patientstreated with immunomodulatory drug combinations

Hussein MA.

Director, Multiple Myeloma Multidisciplinary Clinical Research Program,
Cleveland Clinic Taussig Cancer Center, 9500 Euclid Ave, Cleveland, Ohio 44195, USA, E-mail: mashussein@runbox.us.

Deep vein thrombosis and its lethal complication pulmonary embolism are manifestations of venous thromboembolism (VTE), which is typically associated with cancer and recent major surgery. Certain solid tumors and hematologic malignancies impose an inherently elevated risk of VTE that is compounded by chemotherapy and other risk factors. Multiple myeloma (MM) and other plasma cell dyscrasias are thrombogenic as a consequence of their multiple hemostatic effects, including elevated interleukin-6 levels, pro-coagulant antibody formation, paraprotein interference with fibrin structure, activated protein C resistance, and endothelial damage. The oral immunomodulatory drugs thalidomide and lenalidomide have produced major therapeutic responses in patients with MM when used in combination with oral steroids and chemotherapy, but a high incidence of VTE has been reported. Various VTE prophylaxis strategies with thalidomide- and lenalidomide-containing combinations have been investigated in clinical studies. This review discusses emerging results on the use of VTE prophylaxis to minimize VTE risks associated with MM treatment regimens containing thalidomide and lenalidomide.

PMID: 16732369 [PubMed - in process]

Tuesday, May 30, 2006

Bortezomib after dose-reduced allo

Bortezomib after dose-reduced allogeneic stem cell transplantation for multiple myeloma to enhance or maintain remission status

Kroger N
, Zabelina T, Ayuk F, Atanackovic D, Schieder H, Renges H, Zander A.

Department of Bone Marrow Transplantation, Transplant Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.

OBJECTIVE: We investigated the effect of at least two cycles of bortezomib (1.3 mg/m(2) intravenously, days 1, 4, 8, and 11) after dose-reduced allogeneic stem cell transplantation (SCT) on toxicity, CD3(+) cells, graft-versus-host disease (GvHD), and response in patients with multiple myeloma. METHODS: Eighteen patients with multiple myeloma without progressive disease were included. The proteasome inhibitor was given at median of 8 months after allografting to enhance or maintain remission status. RESULTS: Fourteen patients (78%) completed the proposed two cycles. Four patients had to discontinue therapy due to neurotoxicity (n = 3) or gastrointestinal toxicity (n = 1). Severe grade III/IV toxicity was seen for thrombocytopenia (50%), leukopenia (17%), or neuropathy (17%), which was more often seen in patients treated concomitantly with cyclosporine (p = 0.06). The median circulating CD3(+) cells decreased during treatment from 550 muL to 438 muL (p = 0.03), resulting in herpes zoster infection in three patients (17%). In three patients, a mild aggravation of existing acute or chronic GvHD of the skin, and in one patient de novo skin grade I acute GvHD was noted. In patients with measurable disease, complete remission, partial remission, and minor response was seen in 3 (30%), 5 (50%), and 2 (20%) patients, respective. CONCLUSION: Bortezomib after allogeneic SCT is effective but further studies are needed to balance the efficacy with potential hazards such as infectious complications, aggravation of GvHD, and neurotoxicity.

Saturday, May 27, 2006

Multiple Myeloma genetic study

Hackensack University Medical Center is sharing patient tissue samples in a nationwide search for genetic triggers of multiple myeloma, a rare but incurable cancer of blood cells in bone marrow.

Hackensack is one of 11 health care centers in the Multiple Myeloma Genomic Initiative, a three-year gene mapping program to study the molecular biology of the disease, develop target drugs and test the treatments in clinical trials.

Hospitals in the group will send untreated samples of bone marrow and blood to a tissue bank in Phoenix, which will provide it to researchers around the country.

The recent decoding of the human genome, the blueprint that regulates human life, will enable researchers to tailor specific drugs for individual cancer patients, said Dr. David Siegel, an oncologist who heads the initiative at Hackensack.

"We're going to design our therapy based on what their chromosomes, their genes tell us," Siegel said. Finding a cure may take a decade, but the tissue-sharing initiative will make clinical trials of new cancer drugs more efficient, he said.

The initiative is sponsored by the non-profit Multiple Myeloma Research Consortium of Greenwich, Conn., in partnership with Harvard University and the Massachusetts Institute of Technology.

Besides Hackensack, others participating in the program include the Dana-Farber Cancer Institute of Boston, Saint Vincent Catholic Medical Centers of New York, the Roswell Park Cancer Institute of Buffalo and the Mayo Clinic Scottsdale/Phoenix.

Mayo Clinic update on Multiple Myeloma

New treatments are being used by Mayo Clinic doctors in Rochester, Minn. to treat patients with a type of cancer that affects 16,000 people annually.

Multiple Myeloma is a painful cancer originating in the marrow that destroys bone tissue.

The cancer doesn't have a cure yet, but it is treatable.

The Mayo Clinic is one of the premier Multiple Myeloma research centers in the world.

"Technically, it's a blood cancer," said Mayo Hematologist Dr. Angela Dispenzieri. "It's not contagious. It's not inherited."

Dispenzieri believes the cancer's mysteries lie somewhere within the DNA of mutant plasma blood cells.

Her research attempts to figure out why the cells multiply out of control, why they don't die off when they should.

This is well known: The cancerous cells simply don't play by the rules.

"They don't know enough to limit how much they grow and reproduce. They don't know enough to stay in their little place," said Dispenzieri. "They can spread to other parts of the bone marrow and cause difficulties for the patient."

Symptoms can include fatigue, impaired immunity, bone pain, and kidney problems.

One solution is to kill off a patient's bone marrow with toxic chemotherapy, thereby killing as many cancerous cells as possible.

The patient's own marrow seed cells are first harvested from the blood stream, then returned after the chemotherapy to give the bone marrow a fresh start.

It's a temporary benefit, but it may ease symptoms and add years of life to the patient.

Other treatments are also on the horizon. In Mayo's laboratories alone there are currently a dozen research projects underway.

After waiting nearly 30 years for the next drug treatment to become available, three compounds have shown benefit in clinical trials.

Even the measles virus is being harnessed for the fight. The virus naturally targets cancer cells. Dispenzieri showed a visitor high-tech scans of a mouse whose tumors have been shrunk with the modified measles assault.

"It basically infects the cell and then what it does is makes the cancer cells stick together," she explained. "That just basically destroys the cells."

The measles virus can also be attached to radioactive iodine, hopefully sending a killer blast of high-dose radiation straight into the cancer cells.

Dr. Dispenzieri expects to start testing the measles vaccine therapy on cancer patients this summer.

Source: CBS Broadcasting Inc.

Thursday, May 25, 2006

FDA approval of THALOMID® for Myeloma Patients

Once Controversial Drug Transformed into a "Standard of Care"

that Extends and Improves the Quality of Life for Myeloma Patients

May 25, 2006—The International Myeloma Foundation today applauded the Food and Drug Administration's formal approval of thalidomide, marketed under the brand name THALOMID® by the Celgene Corporation, for the treatment of myeloma. Myeloma, also called multiple myeloma, is an incurable but treatable cancer in the bone marrow affecting production of red cells, white cells and stem cells. Thalidomide was associated with an epidemic of birth defects in the 1950's and 60's when it was prescribed as a sedative for pregnant women across Europe, but the drug was later discovered to have powerful anti-cancer properties and has been transformed into the most widely prescribed treatment for myeloma today.

"THALOMID means that despite having myeloma, I have been able to continue my work as a wildlife filmmaker and to actively continue working to protect wild dolphins," said Hardy Jones, a television journalist-turned-conservationist who has been making documentaries about marine mammals for more than 25 years and co-founded the oceanic conservation group BlueVoice.org. His program about his life's work with dolphins aired on PBS earlier this month. "When I was diagnosed with myeloma, I was afraid I'd have to curtail many activities and stop underwater filming and international travel, but because of my treatment with THALOMID, I'm still producing wildlife documentaries and maintaining my Internet-based advocacy work."

Until the current FDA action, thalidomide was formally approved in the United States only for a side effect of leprosy. However its use in myeloma has been supported by the authoritative National Comprehensive Cancer Network Clinical Practice Guidelines and by numerous clinical trials in newly diagnosed patients as well as those who have relapsed following other treatments. FDA approval means physicians can now prescribe THALOMID for myeloma knowing that it has undergone the FDA's rigorous scientific and safety review process, which will help re-assure patients and facilitate coverage by insurers.

Susie Novis, president of the International Myeloma Foundation, commented: "While we are encouraged by several promising new treatments including VELCADE® and REVLIMID®, myeloma patients rely on multiple regimens so that a new treatment will be available when an old one fails. THALOMID is clinically proven and remains an essential component of myeloma treatment."

Because of thalidomide's history with birth defects, it can only be distributed to patients using Celgene's patented, mandatory program called S.T.E.P.S.® to help ensure it will not be used by women during pregnancy.

"I appreciate the full potential of thalidomide as a valuable treatment for multiple myeloma, and prescribe it to my myeloma patients, even though I know personally the costs of misusing the drug since my own mother took it for morning sickness when she was pregnant with me," said Ralph Naumann, M.D. Ph.D., Dresden University Hospital Germany. "Thalidomide is not a bad drug, it's just a drug that was badly used, and for the many myeloma patients today who are benefiting from thalidomide, that's a crucial distinction."

The FDA approved Thalomid for use in newly diagnosed myeloma patients. Although thalidomide was developed as a powerful sedative, in 1994 doctors began looking at its ability to block growth of blood vessels in malignant tumors, and it was first tested in multiple myeloma in 1997. Within a year thalidomide became recognized as the most promising new agent for multiple myeloma at the time, and it remains an essential part of both the treatment regimen and research into the underlying mechanisms of blood and related cancers.

Wednesday, May 24, 2006

Imatinib as a potential antiresorptive therapy for bone disease

Blood, 1 June 2006, Vol. 107, No. 11, pp. 4334-4337.
Prepublished online as a Blood First Edition Paper on
January 31, 2006; DOI 10.1182/blood-2005-09-3568.

Andrea L. Dewar, Amanda N. Farrugia, Mark R. Condina, L. Bik To, Timothy P. Hughes, Barrie Vernon-Roberts, and Andrew C. W. Zannettino

From the Myeloma and Mesenchymal Research Laboratory, the Division of Haematology, Level 2 Hanson Institute, and the Adelaide Centre for Spinal Research, Institute of Medical and Veterinary Science (IMVS), Adelaide, South Australia, Australia.

Osteoclasts (OCs) are large multinucleated cells derived from progenitor cells of the monocyte-macrophage lineage. Signal transduction via the macrophage–colony-stimulating factor (M-CSF) receptor, c-fms, is essential for OC formation. Since we have previously demonstrated inhibition of c-fms by imatinib, we examined the effect of imatinib on OC formation and activity. OC formation was not affected by concentrations of 1.0 µM imatinib and lower, but was reduced by 75% at 3.0 µM imatinib. In contrast, both the area of resorption and the number of resorption lacunae were reduced by 80% at 0.3 µM imatinib, and no resorption was observed at concentrations above 3.0 µM. A dose-dependent decrease in receptor activator of nuclear factor {kappa}B (RANK) expression was observed in OCs when cultured in the presence of imatinib, providing a mechanism for the decrease in OC function. In vivo analysis of the effect of imatinib on OC activity in adult mice following 8 weeks of imatinib treatment also demonstrated a decrease in OC activity. These results suggest that imatinib may have therapeutic value as an antiosteolytic agent in diseases such as osteoporosis, metastatic bone disease, and multiple myeloma.

Nanotechnology and cancer therapy

Antisense drugs are a new generation of medicine which can block the action of genes which produce harmful proteins.

To date, scientists have struggled to stop the drugs from breaking down as they zone in on the target genes.

But the Northwestern University team found in lab tests combining the drugs with small particles of gold offered them protection, Science reported.

When mutations in the body's genetic material cause too many copies of certain proteins, cancer and other diseases can result.

Typical drugs target the proteins, but antisense drugs target the genetic material itself before it is ever made into copies of harmful proteins.

The drug therapy is still in its infancy, but has the potential to be much more effective than conventional drug treatment.

However, the major challenge has been ensuring the drug remains intact while it finds its way through the body.

Researchers showed that by attaching multiple strands of antisense DNA to the surface of gold nanoparticles - pieces of gold a small fraction of the width of a human hair - the antisense drug could be delivered to its target in a more stable form.

When compared to other methods of delivering antisense drugs using commercial agents, the researchers found they were less toxic and more readily absorbed by cells.

Lead researcher Chad Mirkin said: "In the future, this exciting new class of antisense material could be used for the treatment of cancer and other diseases that have a genetic basis.

"Once inside cells, the DNA modified nanoparticles act as sponges that bind to their targets and prevent them from being converted to proteins."

Source: BBC News

Monday, May 15, 2006

NPI-0052 update

Nereus Pharmaceuticals, Inc., a pioneer in drug discovery and development from marine microbial sources, has initiated a Phase I clinical trial of NPI-0052, a novel, small molecule proteasome inhibitor, to treat patients with solid tumors and lymphomas. The single-agent study is designed to evaluate the safety and tolerability of the anti-cancer compound.

The open label trial is expected to enroll approximately 50 patients with advanced solid tumors or refractory lymphomas at two trial sites, M.D. Anderson Cancer Center and Memorial Sloan-Kettering Cancer Center. Participants will receive once-weekly, intravenous doses of NPI-0052, which will be escalated to determine a maximum tolerated dose. Other objectives include tumor response, pharmacokinetic and pharmacodynamic analyses.

"We are enthused to have given this exciting new compound to the first patient, and look forward to continuing to assess its effects as the trial progresses. The preclinical data for NPI-0052 in various cancers such as colon, pancreas, lung, and multiple myeloma have been very encouraging, and my colleagues and I have been eager to evaluate it in cancer patients," said Razelle Kurzrock, M.D., Director, Division of Cancer Medicine, Phase I Program, and Professor of Medicine, M.D. Anderson Cancer Center, one of the principal investigators.

NPI-0052 was discovered during the fermentation of Salinispora sp., a new class of marine Gram-positive bacteria identified in sediment from the ocean floor. The compound is a potent inhibitor of human proteasomes, a high interest drug target for pharmaceutical companies after bortezomib (Velcade(R)) was approved to treat multiple myeloma in 2003. Nereus and its collaborators' in vitro and in vivo studies showed NPI-0052 inhibited growth and shrank tumors in various animal models. This activity was enhanced when NPI-0052 was combined with biologics and chemotherapeutics. Nereus expects to begin a clinical trial for NPI-0052 in patients with multiple myeloma in upcoming months.

"The activity of NPI-0052 in preclinical models of lymphomas, myeloma and solid tumors has demonstrated it to be a potent and selective second generation proteasome inhibitor with comparatively durable biological effects that may provide significant advances in the treatment of many cancers," said Kobi M. Sethna, President and CEO of Nereus Pharmaceuticals, Inc. "This trial is the first clinical program to open at Nereus and we're excited to begin the important process of determining whether our novel compound can successfully treat solid tumors and lymphomas."

About Nereus Pharmaceuticals, Inc.

Nereus Pharmaceuticals pursues untapped sources of chemical diversity to discover and develop novel therapeutics. With unmatched expertise in marine microbiology and integrated technologies to identify and synthesize novel biologically active compounds, the Company is developing two oncology drug candidates. The proteasome inhibitor NPI-0052 is in a Phase I clinical trial for solid tumors and lymphomas, and will be evaluated in multiple myeloma in the near future. NPI-2358, a vascular disrupting agent, will be evaluated for solid tumors. The Company's discovery portfolio includes additional drug candidates for oncology, as well as infectious diseases and inflammation. Nereus is privately held and based in San Diego, California. For more information, visit www.nereuspharm.com.

Friday, May 12, 2006

Drug companies weigh price limits

As high prices of cancer drugs spark the kind of patient outrage that high AIDS-drug prices unleashed more than a decade ago, a few pharmaceutical and biotech companies are weighing caps and other cost-containment measures, before the outcry turns into a public-relations crisis for the industry.

ImClone Systems Inc. and Bristol-Myers Squibb Co., co-marketers of Erbitux, one of the most expensive cancer drugs on the market, are "well down the road" toward establishing an annual patient price cap for the drug if its market expands, says Ronald Martell, senior vice president of commercial operations at ImClone. Such a program would set an annual ceiling on individual patients' drug-treatment costs, beyond which companies would provide the drug free of charge or at a steep discount. Genentech Corp., of South San Francisco, Calif., is considering cost-containing alternatives for Avastin, which is currently approved for treatment of early-stage colorectal cancer.

While the backlash against cancer-drug prices is nowhere near as big as the one against AIDS-drug prices, ImClone's Mr. Martell says the industry should make changes in its policies now. "Otherwise, at some point there will be a confluence of events -- social pressure, volume of dollars -- and something will have to give," he warns.

Erbitux, priced at $10,000 a month, is currently approved only for patients with metastatic colorectal cancer who have failed a certain kind of chemotherapy. Their average total cost of treatment is currently about $40,000: In most of these patients, the illness has advanced to the point where they are only a few months from death.

But later this year, ImClone and Bristol-Myers, both based in New York, hope to win Food and Drug Administration approval to market Erbitux for patients in earlier stages of colorectal cancer, who have longer life expectancies. Approval for these patients would result in a sharp rise in the average cost of treatment with Erbitux -- and a sharp rise in profits.

In the case of Genentech's Avastin, the current cost of treatment -- $4,400 a month, or $52,000 a year -- could rise sharply if the FDA approves the drug as a treatment -- at double the dose -- to treat lung cancer and breast cancer. Such approvals, expected over the next year, could result in thousands of new patients paying, at current prices, more than $100,000 a year to take Avastin.

The Medicare Modernization Act of 2003, which extended prescription-drug benefits to the elderly, has put financial pressure on elderly cancer patients, the age group with the highest rates of the disease. Under the old system, cancer patients receiving drugs intravenously at a hospital in practice often weren't forced to make their 20 percent co-payment: The hospital would bill Medicare directly, and the Medicare reimbursement price -- as much as 25 percent above the drugs' market price -- provided a sufficient profit cushion so that hospitals often didn't collect co-payments.

But now, Medicare reimbursements are in line with drugs' actual selling prices, and physicians and hospitals can no longer afford to forgive co-payments. As a result, many elderly cancer patients without supplemental prescription-drug insurance end up on the hook for thousands of dollars.

"There's a groundswell of patients who are outraged," says Jerry Flanagan, health-care policy director for the Foundation for Taxpayer & Consumer Rights, a Los Angeles watchdog group.

The Medicare overhaul has made a drug-price cap difficult to design. Medicare drug reimbursement rates are now set at a drug's average wholesale price plus 6 percent. Every time ImClone gives Erbitux free to patients, the government formula would count a sale at a price of zero dollars -- driving down the drug's average price. "It would send the drug into a downward spiral," ImClone's Mr. Martell says. The more free Erbitux dispensed, the lower the price would go.

As a result, ImClone instead is considering directing patients who exceed the cap and meet income guidelines to an independent charitable program that would provide the drug free or at a fraction of the price. Mr. Martell says ImClone and Bristol-Myers haven't agreed on the dollar value of the cap yet, and pricing decisions ultimately rest with Bristol-Myers. Bristol-Myers declined to comment for this story.

"If we do a program like a cap," ImClone's Mr. Martell says, "it would not only help patients but it would help the system as a whole" by limiting the burden on government and private insurers.

Because most cancer drugs don't have competition, an increase in demand usually drives prices up. A surge in patients taking a drug at higher doses would substantially raise costs for private insurers and government.

Genentech says it is also weighing the use of an independent charity, among other options, for giving away Avastin to patients who exceed a certain annual spending limit. "We're trying to balance the interests of patients, the interests of society and the company's interest -- and our desire to innovate for the best drugs," says David Ebersman, Genentech's chief financial officer.

A spokeswoman for the Centers for Medicare and Medicaid Services says companies can provide free drugs to charities without affecting the average sales price. But Walter Moore, vice president of government affairs at Genentech, says hurdles remain, including Medicare reimbursement, which pays oncologists for infusing a drug only in conjunction with paying for the drug.

Cancer drug prices, always considered high, have skyrocketed in recent years. Patient outcry was muted when few patients shouldered the cost of drugs directly. But now, some private insurers and employers are requiring patients to pay 10 percent to 50 percent of the cost of expensive pills and infused drugs, such as Erbitux, adding up to annual drug bills in the tens of thousands of dollars.

Fears about the price of the cancer drug Revlimid prompted the International Myeloma Foundation, an advocacy group, earlier this year to seek a meeting with the manufacturer, Celgene Corp., of Summit, N.J. Celgene had priced the drug at around $4,600 a month, or $55,000 a year, after the FDA approved it in December for a rare blood disorder called myelodysplastic syndrome. Early this year, patients with a different disorder, multiple myeloma, began to worry they wouldn't be able to afford the drug if it were approved for their disease, which investors expect in June. The dose for treating multiple myeloma is 2 1/2 times the dose required for treating the approved disorder. Patients did the math and envisioned drug costs of $135,000 a year.

Susie Novis, the myeloma foundation's president, says Celgene executives in February assured her the price increase would be limited but declined to be specific. A spokesman for Celgene says the company will price the higher dose at less than 2 1/2 times the price of the lower dose.

Protests over AIDS-drug prices peaked in the U.S. in the late 1980s. Activists in 1989 staged demonstrations against Wellcome PLC, now part of GlaxoSmithKline PLC, which makes the AIDS drug AZT. In one protest, five activists chained themselves to a balcony inside the New York Stock Exchange holding a banner that read, "Sell Wellcome." Wellcome lowered the price of AZT several times from $10,000 a year in 1987 to $4,000 by 1998.

Today, AIDS drugs remain much cheaper on average than cancer drugs. To avoid antagonizing AIDS activists, Celgene priced the drug thalidomide at $6 a 50-milligram pill in 1998. But when doctors stopped prescribing the drug as an AIDS-wasting treatment and started prescribing it primarily for cancer, Celgene gradually raised its price to $63.50 a pill. Celgene says it raised prices because the value of the drug increased.

Cancer-drug prices raise eyebrows even on Wall Street. Steven Harr, a Morgan Stanley biotech analyst, estimates oncology drugs will make up 22 percent of U.S. drug spending in 2007, compared with 16 percent in 2004. He expects government and private health insurers to push back.

Fred Hassan, chief executive of Schering-Plough Corp., maker of Temodar, a drug for brain tumors, says the controversy over escalating cancer-drug prices is creating "a healthy debate." "These prices are high, $100,000 a year is high," he says. Still, he adds, high prices are partly justified by the high cost of cancer research and the high rate of product failure.

By John Carreyrou and Geeta Anand, The Wall Street Journal

Thursday, May 11, 2006

Double autologous transplant survival benefit

Prolonged overall survival with second on-demand autologous transplant in multiple myeloma

Between August 1993 and March 2003, 130 consecutive multiple myeloma (MM) patients eligible for high-dose treatment were offered a program including up-front autologous stem cell transplantation (ASCT) after conditioning with 200 mg/m(2) melphalan followed by a second ASCT in case of relapse or progression. A total of 107 (82%) patients completed the first ASCT. The best response obtained after ASCT was complete response (CR) 23%, very good partial response (VGPR) 28%, partial response (PR) 42%, and minimal response (MR) 7%. Median overall survival (OS) and event-free survival (EFS) were 65.4 and 27.7 months, respectively. Relapse or progression occurred in 70 patients; 26 received a second ASCT (with a median time of 20.4 months from first ASCT). A major response (>/=PR) was obtained in 69% of these patients. Median OS and EFS after the second ASCT were 38.1 and 14.8 months. Treatment-related mortality was 1.9% after the first ASCT but no deaths occurred after the second. Our experience suggests that elective up-front single ASCT followed by second ASCT after relapse or progression is a safe and effective global strategy to treat MM patients. Am. J. Hematol. 81:426-431, 2006. (c) 2006 Wiley-Liss, Inc.

Elice F, Raimondi R, Tosetto A, D'Emilio A, Di Bona E, Piccin A, Rodeghiero F.

Department of Hematology, San Bortolo Hospital, Vicenza, Italy.

PMID: 16680735 [PubMed - as supplied by publisher]

Wednesday, May 10, 2006

Health Canada approves Velcade for second-line use

VELCADE* (bortezomib) for Injection has received Health Canada approval under a Notice of Compliance with Conditions for the treatment of progressive multiple myeloma in patients who have received at least one prior therapy.

The second-line approval for VELCADE is based on the results of the APEX (Assessment of Proteasome Inhibition on EXtending Remission Results) study comparing the medication to high-dose dexamethasone, a commonly used chemotherapy, in patients with relapsed multiple myeloma. The study demonstrated a significant survival advantage with VELCADE in patients who had received one to three prior therapies. At one-year of follow-up, VELCADE patients had a significantly higher rate of overall survival (80 per cent) versus patients who received dexamethasone (66 per cent). Overall survival was significantly longer among patients who received VELCADE, both for those who had received one previous treatment and for those who had received more than one previous treatment.

“This approval allows patients to use VELCADE at an earlier stage, providing them with a chance at living longer,” comments Dr. Donna Reece, Associate Professor, Department of Medicine at University of Toronto and APEX trial investigator. “I am very pleased about this approval. As a physician, I am always looking for better ways to care for my patients and provide them with additional treatment options. Being able to use VELCADE second-line will have a greater impact on my patients earlier in the treatment process.”

An estimated 6,200 Canadians have multiple myeloma. In 2005, new cases of multiple myeloma were estimated to reach 1,850 and the number of deaths from this disease was estimated at 1,250. Without VELCADE treatment, survival for relapsed, refractory (unresponsive) multiple myeloma patients ranges from six to nine months (the median survival being eight months).

“Multiple myeloma is a difficult cancer to treat, especially when patients fail at least two lines of therapy,” says Dr. Bernard Lemieux, hematologist-oncologist at NotreDame Hospital (CHUM) in
Montreal. “Being able to treat patients with VELCADE second-line is significant because it means patients may see a greater benefit earlier in the course of their disease.”

About VELCADE (bortezomib) for Injection

VELCADE offers a completely novel approach to treating multiple myeloma by acting on a unique target in cells called the proteasome. The proteasome is a structure that exists in all cells and plays an important role in breaking down proteins that control how the cell lives and grows.

VELCADE was first approved in
Canada under a Notice of Compliance with Conditions in January 2005 for the treatment of patients with multiple myeloma who have relapsed following front-line therapy and are refractory to their most recent therapy. It remains the only treatment in more than a decade to be approved for this group of patients.

VELCADE is reimbursed on a case-by-case basis in
British Columbia, Alberta, Saskatchewan, Manitoba, Quebec and the Atlantic provinces. Newfoundland is the most recent province to approve funding for VELCADE. Ortho Biotech continues to pursue coverage for VELCADE in Ontario.

VELCADE has a generally predictable safety profile. In most cases side effects are manageable with appropriate monitoring and if necessary, dose modification. VELCADE is contraindicated in patients with hypersensitivity to bortezomib, boron, or mannitol. In clinical trials, the most commonly reported adverse events include asthenic conditions (including fatigue, malaise and weakness), diarrhea, nausea, constipation, peripheral neuropathy (numbness of the hands, arms, feet or legs), vomiting, fever and thrombocytopenia (decrease in blood clotting cells).

In
Canada, VELCADE is marketed by Ortho Biotech, a division of Janssen-Ortho Inc.

* Trademark of Millennium Pharmaceuticals, Inc., all trademark rights used under license.

http://www.orthobiotech.ca

Tuesday, May 09, 2006

Cancer resistant mice

Mice that are resistant to cancer have been discovered by researchers in the US.

When white blood cells from the mice are injected into other mice, they eradicate advanced tumours and provide lifetime protection against the disease.

The findings could explain rare cases in which tumours in people spontaneously disappear.

Researchers led by Zheng Cui of Wake Forest University in Winston-Salem, North Carolina, said the natural cancer resistance appeared to be due to a genetic mutation that made white blood cells extremely good at finding and destroying cancer cells.

"Even highly aggressive forms of malignancy with very large tumours were eradicated," Dr Cui said. "The next step is to understand the exact way in which it works, and perhaps eventually design such a therapy for humans."

However, Dr Cui's team has been unable to identify the mutation, and other scientists have cautioned that such surprising findings need to be replicated in other laboratories.

The research, published in the Proceedings of the National Academy of Sciences yesterday, began with a stroke of luck in 1999.

A young researcher transplanting highly virulent cancer cells into mice noticed that one remarkable mouse did not develop cancer, no matter how many lethal doses it got.

The team bred the mouse, and found about half its offspring inherited this natural resistance to a range of cancers including leukemia, lung, liver and connective tissue tumours.

They discovered that injected cancer cells were killed within a day, after white blood cells clustered around them like a "rosette" and ruptured them.

The resistance to cancer was greatest when the mice were adolescent - about six weeks old. If cancer cells were injected at five months of age, the tumours grew like normal but suddenly shrank after a fortnight.

"In some cases this spontaneous regression of cancer was dramatic. A very large tumour mass disappeared overnight," Dr Cui said.

However, mice injected with cancer cells after one year - about half a lifetime - were no longer resistant.

If people had a similar cancer resistance gene, it might be possible to take white blood cells from a patient and introduce a mutated gene so their cells became more effective at fighting cancer, the researchers said.

Such an approach would be "complex and take many years to develop".

Thursday, May 04, 2006

Sea Sponge cancer treatment research

Surfacing new life-saving cancer treatments from the world's oceans is the focus of one of 73 new research grants announced today by the Canadian Cancer Society.

The $685,000, five-year grant is focused on developing new anti-cancer drugs inspired by animals that live in the sea. From Vancouver's coasts to the coral reefs of Papua New Guinea, the research team will be collecting hundreds of sea animals, such as sponges, and examining the powerful chemicals they house inside.

A drug developed by Canadian Cancer Society researcher Dr. Raymond Andersen during a previous grant from the Society is already being tested in phase II clinical trials with lung cancer patients. Another developed to treat blood cancers such as multiple myeloma is looking promising in laboratory tests and with the new funding announced today, Dr. Andersen is optimistic it will move to clinical trials soon.

"The ocean is a rich and diverse source of inspiration for cancer treatment," says Dr. Andersen. "Many common anti-cancer drugs have come from nature, such as the Pacific yew tree and even microorganisms found in soil. We're building on this successful track record by looking to the ocean for new ideas."

Dr. Andersen and his team will screen the marine-based chemicals they find for their cancer fighting abilities. They will then produce synthetic versions of only the most promising ones and test their potential as new treatments on laboratory-grown cancer cells.

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