11/1/2007 web-based article staff google-sina.com Researchers have found a marker on head and neck tumor cells that indicates which cells are capable of fueling the cancer’s growth. The finding is the first evidence of cancer stem cells in head and neck tumors. Cancer stem cells are the small number of cancer cells that replicate to drive tumor growth. Researchers believe current cancer treatments sometimes fail because they are not attacking the cancer stem cells. By identifying the stem cells, researchers can then develop drugs to target and kill these cells. "Our treatment results for head and neck cancer are not as good as we would?like them to be. A lot of people still die of head and neck cancer. This finding will impact our understanding of head and neck cancer, and we hope it will lead to treatments that will be more effective," says study author Mark Prince, M.D., assistant professor of otolaryngology at the University of Michigan Medical School and section chief of otolaryngology at the VA Ann Arbor Healthcare System. Results of the study appear in the Jan. 16 issue of the Proceedings of the National Academy of Sciences. Researchers at the U-M Comprehensive Cancer Center and Stanford University School of Medicine took tumor samples from patients undergoing surgery for head and neck squamous cell carcinoma, including cancers of the tongue, larynx, throat and sinus. Cells from the samples were separated based on whether they expressed a marker on their surface called CD44. The sorted cells were then [...]

10/31/2007 Rochester, MN staff MayoClinic.com Get the facts about chewing tobacco. It's more harmful and addictive than you might think. You can call it what you want — smokeless tobacco, spit tobacco, snus, chew, snuff, pinch, plug or dip — but don't call it harmless. If you're considering making the switch from cigarettes to chewing tobacco because you think the smokeless version of tobacco won't hurt you, be forewarned — chewing tobacco also causes serious health problems. Find out why chewing tobacco is not a healthy option. Chewing tobacco: Just one form of smokeless tobacco Smokeless tobacco products consist of tobacco or a tobacco blend that's chewed, inhaled or sucked on rather than smoked. It's available in three main forms: - Chewing tobacco. This type of smokeless tobacco comes in loose leaf, plugs or twists. As the name suggests, it's chewed. - Snuff. This product is available dry or moist, in loose leaf or in pouches that look like small tea bags. A pinch of snuff may be placed between the cheek and the gum or inhaled into the nostrils. - Betel quid. A product of India, Africa and Asia, betel quid is produced commercially or made at home. It consists of a dried paste that often includes tobacco, areca nuts, catechu, and scent or flavoring. Catechu is a plant-based product used to treat diarrhea and sometimes used for birth control in some parts of the world. Areca nuts are a plant-based product often used as a recreational drug. Betel [...]

10/31/2007 Orlando, FL Kate McHugh, Ivanhoe Health Correspondent www.ivanhoe.com Head and neck cancers affect more than 40,000 people in the United States every year and more than 500,000 worldwide. When caught early, the prognosis is promising, but survival rates decrease as the disease advances. Now, two treatment therapies are making a big difference in the survival of patients suffering from advanced head and neck cancers. Standard initial treatment for advanced head and neck cancers is chemotherapy. Two new studies show promising results with treatments following chemo. “I think that patients get very scared when they get this diagnosis, frightened and anxious. I think they should recognize that we are now clearly above the 50-percent [survival] level -- quite a bit above it,” Marshall Posner, M.D., medical director of the Head and Neck Oncology Center at the Dana-Farber Cancer Institute in Boston, told Ivanhoe. In a recent study out of Europe, researchers found a combination therapy treatment, known as TPF -- adding docetaxel to the standard PF therapy (cisplatin and fluorouracil) -- improved survival outcomes by 27 percent in patients with an unresectable cancer -- tumors that cannot be removed. “What the European trial demonstrates is that TPF is a reasonable therapy for patients with an unresectable disease and promotes an improvement in survival,” said Dr. Posner, the lead author of another new study, which reveals using the TPF therapy after chemotherapy and following with chemoradiotherapy -- a combination of chemotherapy with radiation therapy -- gives patients a 30-percent reduction in [...]

10/29/2007 Jerusalem, Israel staff The Future of Things (www.tfot.com) An oncologist from Michigan has devised a new approach to clinical medicine. Using DNA micro-array chips, Dr. Eric Lester analyzed gene expression profiles of tumors in patients with advanced incurable cancer. For each patient, he first identified certain genes associated with a favorable response to anti-cancer drugs, and then determined an individualized treatment plan according to these findings. New, targeted cancer therapies focus on specific genetic mutations in the patient's body in order to fight the disease. These therapies usually also have fewer side-effects than conventional chemotherapy. However, cancer is a complex, dynamic and unpredictable disease with a wide array of embodiments at the molecular level. For this reason, no single treatment is effective against every type of tumor. In order to effectively treat cancer we need to understand the biological mechanisms behind it. Since every cancer tumor is unique, doctors struggle to find the most suitable personalized treatment plan for each patient. Currently, they rely mostly on their instincts and personal experience to choose the appropriate treatment methods. Dr. Eric Lester, of the Oncology Care Associates in St. Joseph, Michigan, devised an experiment that illustrates the promise of personalized medicine. He had six patients with advanced, incurable cancer. In order to determine which anti-cancer drugs would benefit each patient, Lester analyzed his patients' tumors, seeking the expression of genes associated with responsiveness to various anti-cancer drugs. He then based his drug treatment plans on the experiment's findings. To analyze gene [...]

10/29/2007 web-based article Jan B. Vermorken et al New England Journal of Medicine (content.newm.org) Background: Phase 2 studies suggest that the standard regimen of cisplatin and fluorouracil (PF) plus docetaxel (TPF) improves outcomes in squamous-cell carcinoma of the head and neck. We compared TPF with PF as induction chemotherapy in patients with locoregionally advanced, unresectable disease. Methods: We randomly assigned eligible patients between the ages of 18 and 70 years who had stage III or stage IV disease and no distant metastases to receive either TPF (docetaxel and cisplatin, day 1; fluorouracil by continuous infusion, days 1 to 5) or PF every 3 weeks for four cycles. Patients without progression of disease received radiotherapy within 4 to 7 weeks after completing chemotherapy. The primary end point was progression-free survival. Results: A total of 358 patients underwent randomization, with 177 assigned to the TPF group and 181 to the PF group. At a median follow-up of 32.5 months, the median progression-free survival was 11.0 months in the TPF group and 8.2 months in the PF group (hazard ratio for disease progression or death in the TPF group, 0.72; P=0.007). Treatment with TPF resulted in a reduction in the risk of death of 27% (P=0.02), with a median overall survival of 18.8 months, as compared with 14.5 months in the PF group. There were more grade 3 or 4 events of leukopenia and neutropenia in the TPF group and more grade 3 or 4 events of thrombocytopenia, nausea, vomiting, stomatitis, and hearing [...]

10/29/2007 West Lafayette, IN staff Biocompare Life Science News (news.biocompare.com) Researchers have shown how tiny "nanorods" of gold can be triggered by a laser beam to blast holes in the membranes of tumor cells, setting in motion a complex biochemical mechanism that leads to a tumor cell's self-destruction. Tumor cell membranes often have an abnormally high number of receptor sites to capture molecules of folic acid, or folate, a form of vitamin B that many tumor cells crave. The Purdue researchers attached folate to the gold nanorods, enabling them to target the receptors and attach to the tumor cell membranes. "The cells are then illuminated with light in the near-infrared range," said Ji-Xin Cheng (pronounced Gee-Shin), an assistant professor in Purdue's Weldon School of Biomedical Engineering. "This light can easily pass through tissue but is absorbed by the nanorods and converted rapidly into heat, leading to miniature explosions on the cell surface." Scientists have recently determined that gold nanorods and other nanostructures can be used to target and destroy tumor cells, but it was generally assumed that cell death was due to the high heat produced by the light-absorbing nanoparticles. The Purdue team discovered, however, that a more complex biochemical scenario is responsible for killing the cells. "We have found that rather than cooking the cells to death, the nanorods first punch holes in the membrane, and cell death is then chemically induced, in this case by an influx of calcium," said Alexander Wei, an associate professor of chemistry at [...]

10/29/2007 Serena Gordon DentalPlans.com The addition of the chemotherapy drug, docetaxel, to the standard two-drug regimen used for head and neck cancers improved the efficacy of the treatment while reducing the toxicity, two new studies report. The triple drug chemotherapy regimen was so effective that it increased survival in both studies and more than doubled the average overall survival in one of the studies. "This is a study that demonstrates that a three-drug regimen is better by a substantial amount in terms of survival for head and neck cancer. There was a 30 percent reduction in mortality with less toxicity," said Dr. Marshall R. Posner, lead author of the first study and medical director of the head and neck oncology program at the Dana-Farber Cancer Institute in Boston. "This is a wonderful step forward for patients." Results from both clinical trials are published in the Oct. 25 issue of the New England Journal of Medicine. Both studies were funded, at least partially, by Sanofi-Aventis, the manufacturer of docetaxel. About 3 percent to 5 percent of all cancers in the United States are head and neck cancers, according to the National Cancer Institute. That means almost 40,000 Americans are diagnosed with these cancers each year. They most commonly occur in people over 50, and the biggest risk factor for head and neck cancers is tobacco use. Treatment for these cancers can be difficult, because surgical removal of tumors can affect the way a person chews, talks and swallows. In some cases, [...]

10/29/2007 Los Angeles, CA press release EurekAlert! (www.eurekalert.org) Results from a University of Pittsburgh study demonstrate that intensity-modulated radiation therapy (IMRT) for head and neck cancer can be uniformly delivered in a large health care system of academic and community cancer centers through a centralized planning and treatment process. The findings were presented today at the 49th annual meeting of the American Society for Therapeutic Radiology and Oncology (ASTRO) in Los Angeles. “Our study demonstrates that it is feasible for head and neck cancer patients to receive IMRT in their own communities without sacrificing high-quality care,” said Dwight Heron, M.D., associate professor of radiation oncology, University of Pittsburgh School of Medicine and director of radiation oncology, University of Pittsburgh Medical Center (UPMC). “This is possible through an integrated network in which treatment is standardized across all cancer centers.” According to study results, there were no significant differences in toxicity profiles and treatment outcomes in 604 head and neck cancer patients treated with IMRT at 12 community cancer centers and one academic flagship facility. Two hundred and forty-eight patients (41 percent) were treated at the flagship facility, and 356 patients (59 percent) received IMRT at one of the community centers. All 13 centers, connected through a telemedicine network, followed the same clinical pathway guidelines for the radiotherapy management of head and neck cancer, which included specific details on volumes for radiation treatment planning and recommended doses of IMRT. When the investigators compared outcomes between the academic center and the community centers, [...]

10/29/2007 Edmonton, Alberta, Canada press release CNNMoney.com Biomira Inc. announced today that preclinical data for its targeted anti-cancer drug candidates PX-478 and PX-866 were presented in a poster session yesterday at the AACR-NCI-EORTC International Conference on Molecular Targets and Cancer Therapeutics, which is being held October 22-26 in San Francisco. The data may help to guide future clinical studies of these innovative small molecule compounds. A Phase 1 trial of PX-478 in patients with advanced metastatic cancers is in progress. Biomira expects to file an Investigational New Drug application for PX-866 early in 2008. The PX-478 data (Abstract #284) provide insight into how and under what conditions the compound inhibits the activity of its target, the transcription factor hypoxia-inducible factor-1alpha (HIF-1 alpha). PX-478 works by a unique mechanism, decreasing both HIF-1 alpha gene expression and protein synthesis. This leads to a significant reduction in the amount and activity of HIF-1 alpha in the tumor. The results show that PX-478 is highly specific for HIF-1 alpha and does not inhibit the levels of any of the other proteins tested. Additionally, this inhibitory effect is independent of the tumor suppressor genes VHL and p53, genes that may significantly impact how cancer cells respond to a variety of therapeutic interventions. "Hypoxia is a feature of many solid tumors and HIF-1 alpha is the tumor's primary survival response to this stress," said Dr. Garth Powis, Director, Center for Targeted Therapy, MD Anderson Cancer Center, Houston, Texas, and senior author of the abstract. "Inhibiting both [...]

10/26/2007 New York, NY staff CBS News (www.cbsnews.com) Colleen Zenk Pinter, Of "As the World Turns," Had Oral Cancer On Her Tongue Doctors tell us to wear sunscreen and hats to prevent skin cancer, and get tested for prostate cancer and cervical cancer. But did you know oral cancer kills more people than any of those others? And it's been occurring in more and more women, and has now been linked to the same HPV virus associated with cervical cancer. Colleen Zenk Pinter, who's played Barbara Ryan on the CBS soap opera "As the World Turns" for almost 30 years, has been involved in a real-life drama, fighting oral cancer, a potential killer few people have even heard of, for the past seven months. She discussed the medical and professional challenges it posed with co-anchor Hannah Storm on The Early Show Thursday. Pinter, 54, who doesn't smoke or drink, told Storm that, at first, she thought she had a common canker sore, which went away. But when it came back and persisted, she saw her doctor, who had her go to a specialist the next day. Three surgeries later, including removal and reconstruction of part of, and the insertion of radioactive beads in her tongue, she's been declared cancer-free. The only noticeable lingering effect is a slight lisp, and she's been back at work. Pinter says fans thought she'd had a stroke, or dental work done. She stressed to Storm that everyone should be screened for oral cancer on a [...]