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Drug shortage linked to greater risk of relapse in young Hodgkin lymphoma patients

National study connects higher rates of relapse in pediatric cancer patients to drug shortage, offering first example of patients hurt by shortages and renewing calls to protect patient access to lifesaving treatments

MEMPHIS, Tenn., Dec. 26, 2012 /PRNewswire-USNewswire/ -- A national drug shortage has been linked to a higher rate of relapse among children, teenagers and young adults with Hodgkin lymphoma enrolled in a national clinical trial, according to research led by St. Jude Children's Research Hospital.

Estimated two-year cancer-free survival for patients enrolled in the study fell from 88 to 75 percent after the drug cyclophosphamide was substituted for mechlorethamine for treatment of patients with intermediate- or high-risk Hodgkin lymphoma. The study was launched before the drug shortages began. The change occurred after a mechlorethamine shortage that began in 2009. No study patients have died, but those who relapsed received additional intensive therapy that is associated with higher odds for infertility and other health problems later.

An analysis comparing how patients in each group were faring two years after their cancer diagnoses appears in the December 27 edition of the New England Journal of Medicine. The report provides the first evidence of a drug shortage adversely impacting treatment outcomes in specific patients. St. Jude led the study for a national group that includes the Stanford University School of Medicine and Lucile Packard Children's Hospital at Stanford; Dana-Farber Cancer Institute and Boston Children's Hospital; Massachusetts General Hospital; and Maine Medical Center.

In recent years, many patients and caregivers have had their medical care complicated by drug shortages, primarily of generic injectable drugs like mechlorethamine. Mechlorethamine, which has been used in cancer treatment since the 1960s, has only recently become available again.

Cyclophosphamide has been widely used in treatment of both adults and children with Hodgkin lymphoma. Based on earlier studies, the drug was considered a safe and effective alternative to mechlorethamine.

"This is a devastating example of how drug shortages affect patients and why these shortages must be prevented," said Monika Metzger, M.D., an associate member of the St. Jude Department of Oncology and the study's principal investigator. "Our results demonstrate that, for many chemotherapy drugs, there are no adequate substitute drugs available."

Past shortages have been resolved in a variety of ways and always before a drug substitution became necessary, said Michael Link, M.D., the senior author of the new report. Link is a professor of pediatrics in hematology-oncology at Stanford and a member of the pediatric hematology-oncology service at Packard Children's Hospital. He is also immediate past president of the American Society of Clinical Oncology. "This puts a face on the problem of drug shortages and shows that the problem is real, not theoretical. This is about a curative therapy that we were unable to administer because the drug we needed was not available," Link said. "Despite heroic efforts by the drug shortage office of the Food and Drug Administration to solve the shortages of a number of medically necessary drugs, it is clear that patients are still suffering from the unavailability of life-saving drugs.  A more systematic solution to the problem is needed."

Amy Billett, M.D., a pediatric oncologist at Dana-Farber/Children's Hospital Cancer Center in Boston is the paper's other author.

Hodgkin lymphoma is a cancer of the lymph system and accounts for about 6 percent of childhood cancers. In the United States, about 90 percent of patients will become long-term survivors.  Working as the Pediatric Hodgkin Consortium, in 2002 the five institutions involved in this study adopted a seven-drug chemotherapy regimen that included mechlorethamine for the treatment of high-risk pediatric patients. The goal was to preserve high cure rates, but to reduce the risk of second cancers, infertility and other problems associated with the earlier treatments. In 2006, a parallel study was opened for patients with intermediate-risk disease. The risk categories reflect the extent to which cancer has spread, particularly the number and location of lymph nodes involved, plus the presence of unfavorable symptoms of fever, night sweats and unexplained weight loss. 

The strategy involved 12 weeks of the seven-drug chemotherapy regimen. Patients also received radiotherapy with the dose based on their response to chemotherapy. When mechlorethamine became unavailable, the protocol was revised to allow the cyclophosphamide substitution.

Outcomes for cancer patients are often measured in terms of cancer-free survival, which is the number of years patients remain free of the disease. When researchers assessed the substitution's impact, they found that estimated disease-free survival was 88 percent for the 181 patients whose treatment included mechlorethamine. It was 75 percent for the 40 patients who received cyclophosphamide instead. The difference led researchers to stop enrolling new patients in the trials.

"We can think of no credible explanation for this dramatic difference in event-free survival other than the drug substitution," the researchers noted. The analysis found that, as a group, patients who received cyclophosphamide had fewer unfavorable symptoms and were more likely to have intermediate-risk, rather than high-risk Hodgkin lymphoma. The patients ranged in age from 3 to 21. Half were age 14 or younger. 

Patients who relapsed received additional therapy. Researchers said it is too soon to know if these patients will have the same long-term survival rates as those whose did not relapse.  The additional treatment included intensive chemotherapy followed by a stem cell transplant using the patient's own blood-producing stem cells.

St. Jude Children's Research Hospital
Since opening 50 years ago, St. Jude Children's Research Hospital has played a pivotal role in pushing overall U.S. pediatric cancer survival rates from 20 to 80 percent. Founded by the late entertainer Danny Thomas, St. Jude is the first and only National Cancer Institute-designated Comprehensive Cancer Center devoted solely to children. St. Jude is also a leader in research and treatment of life-threatening blood disorders and infectious diseases in children. No family ever pays St. Jude for the care their child receives. To learn more, visit www.stjude.org. Follow us on Twitter @StJudeResearch.

The Stanford University School of Medicine
The Stanford University School of Medicine consistently ranks among the nation's top medical schools, integrating research, medical education, patient care and community service. For more news about the school, please visit http://mednews.stanford.edu.

Lucile Packard Children's Hospital
Lucile Packard Children's Hospital at Stanford is an internationally recognized 311-bed hospital, research center and leading regional medical network providing the full complement of services for the health of children and expectant mothers. In partnership with the Stanford University School of Medicine, our world-class doctors and nurses deliver innovative, family-centered care in every pediatric and obstetric specialty, tailored to every patient. Packard Children's is annually ranked as one of the nation's best pediatric hospitals by U.S. News & World Report and is the only Northern California children's hospital with specialty programs ranked in the U.S. News Top 10. Learn more about us at www.lpch.org and about our continuing growth at growing.lpch.org. Like us on Facebook, watch us on YouTube and follow us on Twitter.

Dana-Farber/Children's Hospital Cancer Center
Since 1947, Boston Children's Hospital and Dana-Farber Cancer Institute have provided comprehensive care for children and adolescents with cancer through Dana-Farber/Children's Hospital Cancer Center. The two Harvard Medical School affiliates share a clinical staff that delivers inpatient care at Boston Children's and outpatient therapies at Dana-Farber's Jimmy Fund Clinic. The Boston Children's inpatient pediatric cancer service has 33 beds, including 13 designated for stem cell transplant patients.

SOURCE St. Jude Children's Research Hospital

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