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Scientific American - Objets Actus

Fact or Fiction?: Cell Phones Can Cause Brain Cancer
Vendredi 21 Novembre 2008 - 12:30 - 1 mois, 2 semaines depuis - Cancer - Scientific American
This summer, Ronald Herberman, director of the University of Pittsburgh Cancer Institute, sent a memo to staffers warning them to limit their cell phone use and to use hands-free sets in the wake of "growing evidence that we should reduce exposure" to cell phone radiation. Among the possible consequences: an increased risk of brain cancer. [More]

Taming Vessels to Treat Cancer
Lundi 10 Novembre 2008 - 13:50 - 1 mois, 4 semaines depuis - Cancer - Scientific American
Editor's Note: This story, originally printed in the January 2008 issue of Scientific American, is being posted in light of two new studies showing that angiogenesis inhibitors, discussed in this article, may actually make tumors bigger, not smaller. [More]

Is Chronic Inflammation the Key to Unlocking the Mysteries of Cancer?
Dimanche 09 Novembre 2008 - 11:05 - 1 mois, 4 semaines depuis - Cancer - Scientific American
Editor's Note: This story, originally printed in the July 2007 issue of Scientific American, is being posted in light of two new studies showing that angiogenesis inhibitors, discussed in this article, may actually make tumors bigger, not smaller.More than 500 million years ago a set of specialized enzymes and proteins evolved to defend our primitive ancestors against assaults from the outside world. If a microbe breached the shell of some Cambrian-era fauna, the members of this early vintage immune system would stage a savage but coordinated attack on these interlopers--punching holes in cell walls, spitting out chemical toxins or simply swallowing and digesting the enemy whole. Once the invaders were dispatched, the immune battalion would start to heal damaged cells, or if the attacked cells were too badly damaged it would put them to rest. [More]

Cancer Vaccine: Looking Beyond Tumor Size
Mardi 04 Novembre 2008 - 07:00 - 2 mois depuis - Cancer - Scientific American
Stimulating the immune system to destroy tumor cells has long been a hope--but judging from past studies, perhaps a dashed one. Clinical trials testing various cancer vaccines have failed miserably; in one, a melanoma vaccine called Canvaxin did not improve the survival of patients, an outcome that ultimately forced the drugmaker to sell itself to another firm. But rather than writing off cancer immunotherapy, some researchers argue that the agents have been examined in the wrong way, resulting in erroneous conclusions. With the correct study design, proponents say, cancer vaccines should prove to be promising.Such optimism arises from data that have surfaced in the wake of failed tests. After phase III trials, reported in 2006, ended in disappointment for the prostate cancer vaccine Provenge (made by Dendreon in Seattle), subsequent analyses revealed that men whose prostate cancer had spread survived a median of 4.5 months longer than those given a placebo. Patients who took the vaccine and went on to receive chemotherapy survived even longer: a median of 34.5 months, versus 25.4 months for patients who received the placebo followed by chemotherapy. [More]

Growing Prostates from Adult Stem Cells--But Who Would Want One?
Mercredi 22 Octobre 2008 - 16:00 - 2 mois, 2 semaines depuis - Cancer - Scientific American
Researchers report today that they grew prostate glands--important for reproduction in male mammals--in mice using a single stem cell transplanted from the prostates of donor mice. The findings may pave the way to new therapies for prostate cancer, which strikes one in six men in the U.S. [More]

Mapping the Spine, Gene by Gene
Dimanche 12 Octobre 2008 - 22:00 - 2 mois, 3 semaines depuis - Cancer - Scientific American
Spinal cord injuries and disorders afflict millions worldwide, from disabled veterans to people with neurodegenerative disorders such as Lou Gehrig’s disease, yet there is currently no way to repair a damaged spine. Geneticists at the Allen Institute for Brain Science in Seattle are hoping to change that by developing the first genetic encyclopedia of the spinal cord.The Allen Spinal Cord Atlas, which will be available online for free in early 2009, will map out which genes are active in which locations along the spine in mice, which share 90 percent of their genetic material with humans. [More]

How Green Was the Nobel Prize in Chemistry
Mercredi 08 Octobre 2008 - 05:04 - 3 mois depuis - Cancer - Scientific American
[The following is an exact transcript of this podcast.]The Nobel Prize in chemistry goes to three men who revolutionized molecular life science, Japan’s Osamu Shimomura and Americans Martin Chalfie and Roger Tsien. They developing tools to light up and see individual proteins inside living cells. These tiny molecular flashlights make it possible to study numerous events that take place in cells and whole organisms that were previously invisible--such as the development of nerve cells or the spread of cancer cells. [More]

What makes pancreatic cancer so deadly?
Lundi 25 Août 2008 - 15:00 - 4 mois, 2 semaines depuis - Cancer - Scientific American
Gene Upshaw, the executive director of the National Football League Player's Association--the union for NFL players--died late Wednesday evening of pancreatic cancer while vacationing in California's Lake Tahoe. Doctors diagnosed the 63-year-old Hall of Fame offensive lineman with the disease just four days earlier. [More]

Antibody Drug Unleashes Tumor-Killer T Cells
Vendredi 15 Août 2008 - 10:00 - 4 mois, 3 semaines depuis - Cancer - Scientific American
Scientists have developed a two-pronged protein that grabs immune system cells with one arm and introduces them to cancer cells it has snagged with the other. The result: eradicated tumors--at certain doses. [More]

Cancer Drug Costs May Help Doctors Select a Treatment
Lundi 11 Août 2008 - 22:00 - 4 mois, 4 semaines depuis - Cancer - Scientific American
Oncologists will soon be adding “financial counselor” to their job description. With an increasing number of cancer patients suffering economic hardships as a side effect of expensive therapy, most oncologists are finding that cost needs to be considered as part of treatment options. Leading cancer organizations are now working on incorporating cost into treatment guidelines and other materials. The change, which departs from the current American medical ethos, is fraught with thorny questions not only for cancer doctors and patients but also for the health care system at large.The U.S. spends about $200 billion annually on cancer care; many new drugs cost several thousand dollars monthly. For patients, co-payments represent the most severe sappers of bank accounts. Increasingly, insurers are holding patients accountable for up to 20 percent of the prescription price. Covered drugs being used off-label (for an indication not formally approved but still medically appropriate) can carry co-pays of up to 30 percent. [More]

Actus fournies par : Scientific American

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