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Plexxikon Announces PLX4032 Phase 1 Data Showing Objective Responses In Metastatic Melanoma Patients
Plexxikon Inc. today announced preliminary data from a Phase 1 clinical study investigating PLX4032 (R7204). PLX4032 is a novel, oral and highly selective drug that targets the BRAFV600E cancer-causing mutation that occurs in most melanomas and about eight percent of all solid tumors. In patients whose cancer harbors this mutation and who were treated with therapeutic doses of PLX4032, tumor shrinkage and extended progression-free survival have been observed. Currently, two extension studies are being conducted in mutation-positive melanoma and colorectal cancer patients. Following the initial positive findings announced today, larger clinical trials to support a registration program for product approval are targeted to start later in 2009. Plexxikon and Roche are co-developing PLX4032 under their 2006 license and collaboration agreement.
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Vaporized Viral Vector Shows Promise In Anti-Cancer Gene Therapy
A new lung cancer therapy employing a vaporized viral vector to deliver a cancer-inhibiting molecule directly to lung tissue shows early promise in mouse trials, according to researchers at the Ministry of Education, Science and Technology in Korea.
News of the day
The White House Announces H1N1 Flu Preparedness Summit
The White House announced that Health and Human Services Secretary Kathleen Sebelius, Homeland Security Secretary Janet Napolitano, Education Secretary Arne Duncan, and Homeland Security Advisor John Brennan will host an all-day H1N1 Flu Preparedness Summit with states to further prepare this nation for the possibility of a more severe outbreak of H1N1 flu. The Summit will be held on July 9, 2009 at the Natcher Conference Center at the National Institutes of Health in Bethesda, Maryland.
Nutrition

Link Between Successful Weight Loss And Vitamin D Levels

Vitamin D levels in the body at the start of a low-calorie diet predict weight loss success, a new study found. The results, which suggest a possible role for vitamin D in weight loss, were presented at The Endocrine Society"s 91st Annual Meeting in Washington, D.C. "Vitamin D deficiency is associated with obesity, but it is not clear if inadequate vitamin D causes obesity or the other way around," said the study"s lead author, Shalamar Sibley, MD, MPH, an assistant professor of medicine at the University of Minnesota. In this study, the authors attempted to determine whether baseline vitamin D levels before calorie restriction affect subsequent weight loss. They measured circulating blood levels of vitamin D in 38 overweight men and women before and after the subjects followed a diet plan for 11 weeks consisting of 750 calories a day fewer than their estimated total needs. Subjects also had their fat distribution measured with DXA (bone densitometry) scans. On average, subjects had vitamin D levels that many experts would consider to be in the insufficient range, according to Sibley. However, the authors found that baseline, or pre-diet, vitamin D levels predicted weight loss in a linear relationship. For every increase of 1 ng/mL in level of 25-hydroxycholecalciferol - the precursor form of vitamin D and a commonly used indicator of vitamin D status - subjects ended up losing almost a half pound (0.196 kg) more on their calorie-restricted diet. For each 1-ng/mL increase in the active or "hormonal" form of vitamin D (1,25-dihydroxycholecalciferol), subjects lost nearly one-quarter pound (0.107 kg) more. Additionally, higher baseline vitamin D levels (both the precursor and active forms) predicted greater loss of abdominal fat. "Our results suggest the possibility that the addition of vitamin D to a reduced-calorie diet will lead to better weight loss," Sibley said. She cautioned, however, that more research is needed. "Our findings," she said, "need to be followed up by the right kind of controlled clinical trial to determine if there is a role for vitamin D supplementation in helping people lose weight when they attempt to cut back on what they eat." The National Institutes of Health, the University of Minnesota, and the Pennock Family Endowment at the University of Minnesota funded this study. Aaron Lohr The Endocrine Society


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