Amyloid beta deposits in brain of Alzheimer’s patient.
What’s the News: A drug used to cure skin cancer is also a possible treatment for Alzheimer’s, according to a new study in Science. The drug not only reduced levels of amyloid beta—a protein whose elevated levels are a hallmark of the disease—but also reversed cognitive decline. In mice, dramatic effects were evident after just 72 hours.
Chemotherapy is poison that happens to kill cancer cells faster than it kills healthy cells; that it wreaks havoc on the bodies of patients is unsurprising. But chemo may also affect their unborn children. According to a new study in PNAS, the offspring of mice treated with chemotherapy have higher rates of mutation, even though the offspring themselves were never exposed to the drugs.
The results suggest that these mutations arise from genome destabilization caused by exposure to chemo, rather than just mutated sperm from the treated father. Male mice in the study were exposed to one of three common anticancer drugs—cyclophosphamide, mitomycin C, or procarbazine—and then allowed to mate with untreated females. After sequencing a small piece of DNA from the offspring, the researchers found that mice with treated fathers had mutation rates up to twice that of mice with untreated fathers. Notably, these mutations were present in DNA inherited from both the treated father and untreated mother.
Hugo Chavez, president of Venezuela, has speculated that the fact that he and four other South American leaders have all recently come down with various cancers could be a sign that the US has developed methods to give people cancer. Uh, is that even possible? Slate‘s Explainer does a thorough, interesting walk-through of all the reasons why the answer is, “Not reliably.”
You could…contaminate the victim’s diet with high levels of aflatoxin, which is associated with liver cancer. Or you could infect him with any of a number of cancer-causing biological agents. Helicobacter pylori contributes to the development of gastric cancer, and human papillomaviruses can cause cervical, anal, and a few other forms of cancer. But these tactics probably wouldn’t produce cancer in the short term and aren’t guaranteed to have any effect at all. In countries with high aflatoxin exposure, like China and parts of Africa, fewer than 1 in 1,000 people develop liver cancer.
If we knew how to give people cancer reliably, we might be better at preventing it. As it stands, cancer prevention, except for a few stand outs like quitting smoking, is can be just as hit-or-miss as cancer contraction.
Image courtesy of nicogenin / flickr
The blood oxygen-monitoring chip, which is about 2 cm long and encased in plastic, is still in the
early stages of testing.
What’s the News: Scientists in Germany are developing a chip that keeps track of blood oxygen levels for implanting near tumors, reports Kate Baggot at Technology Review. When blood oxygen levels drop, signalling a burst of tumor growth, doctors would be alerted immediately, jump-starting the treatment process.
Specially trained sniffer dogs can smell something on the breath of lung cancer patients.
Dogs will sniff anything and everything, and can even tell identical twins apart by scent. And tumors, you may be surprised to learn, have their own very faint smells. To figure out how to diagnose internal cancers that are frequently overlooked until too late from just a breath sample, scientists have been working with dogs to see if these smells can be reliably differentiated from, say, the smell of breakfast, that last cigarette, or emphysema.
Modified immune cells decimated chronic lymphocytic leukemia, scientists found.
What’s the News: Striking results in a very small study have got the web a-buzz about a new cancer treatment: With three leukemia patients at the ends of their ropes, scientists modified some of their immune cells with a gene that enabled them to hunt down cancer cells. Remarkably, the treatment wiped out more than two pounds of tumor tissue in each patient, and the three have now been in remission for a year.
But what weight does such a small study carry, what about the side effects, and what do these results mean for people with other cancers?
What’s the News: Due to a vicious disease, the population of the endangered Tasmanian devil has decreased by at least 70 percent since 1996. The cancer, devil facial tumor disease, spreads when an infected devil bites another, typically during feeding or mating. Because Tasmanian devils are so genetically similar, their bodies don’t recognize the intruding cancer cells as foreign.
But now, researchers have sequenced the genome of two devils and created a genetic test that could help breeders select genetically diverse mates. The test will help conservationists breed future generations of Tasmanian devils that are prepared for the cancer, as well as other types of diseases.
What’s the News: Three new drugs have been shown to improve survival and slow disease progress in patients with metastatic melanoma. This advanced form of the disease is the deadliest type of skin cancer, with patients surviving for an average of only 6 to 9 months. Phase III clinical trials of the treatments—a new chemotherapy drug, an immune-system treatment combined with traditional chemotherapy, and a vaccine combined with another immune treatment—were recently published in the New England Journal of Medicine.
Metastatic melanoma cells
What’s the News: Souped-up cells from a patient’s own immune system could one day be used to treat advanced melanoma, according to a preliminary study published in Science Translational Medicine investigating the safety of the technique. The researchers manipulated a patient’s immune system cells to better recognize cancer cells in the lab and then re-introduced those cells into the body—an approach called “adoptive T-cell therapy.”