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Science News for February 5, 2002


Spiral waves break hearts: Importance of communication between cardiac cells is demonstrated

Researchers investigate how electrical impulses travel through cardiac tissue and how impaired cell communication affects heart health. They develop a computer model that shows how electrical activity spreads like a fire in a forest, and find that spiral waves breaking up into multiple spirals may be similar to the patterns that cause ...

SourceAmerican Institute of Physics·JournalPhysical Review Letters·DateFeb 5, 2002

Misclassification of death may influence perceived value of cancer screening

A study found that two forms of bias in cause-of-death classification affect the results of randomized trials on cancer screening. Sticky-diagnosis bias biases against screening, while slippery-linkage bias biases in favor of screening. The authors suggest using all-cause mortality to accurately assess the value of screening.

SourceJournal of the National Cancer Institute·JournalJNCI Journal of the National Cancer Institute·DateFeb 5, 2002

Other highlights in the Feb. 6 issue of JNCI

Researchers found that response rates, survival rates, and quality-of-life outcomes are similar between elderly patients (ages 70+) and younger patients with non-small-cell lung cancer. Additionally, studies report an increased risk of lung cancer after Hodgkin's disease treatment, especially in smokers, and analyzed cost-effectiveness...

SourceJournal of the National Cancer Institute·JournalJNCI Journal of the National Cancer Institute·DateFeb 5, 2002

Tanning devices may contribute to incidence of common skin cancers

A new study found that individuals who used tanning devices were 2.5 times more likely to develop squamous cell carcinoma and 1.5 times more likely to develop basal cell carcinoma compared to those who did not use them. The risk of these cancers increased with the age at which participants started using tanning devices.

SourceJournal of the National Cancer Institute·JournalJNCI Journal of the National Cancer Institute·DateFeb 5, 2002

Elderly lung cancer patients tolerate aggressive chemotherapy as well as younger patients

A retrospective analysis of 574 patients with non-small cell lung cancer found that older patients tolerated chemotherapy regimens comparable to younger patients. However, psychological distress and neutropenia were more prevalent in the elderly population. The study suggests that functional status is a key factor in determining treatm...

SourceFox Chase Cancer Center·JournalJNCI Journal of the National Cancer Institute·DateFeb 5, 2002

HIV/AIDS impact on education intensifies economic downfall

The HIV/AIDS epidemic in Mozambique is taking a toll on education, leading to reduced school enrollments, graduation rates, and quality of education. The report predicts that the country's economy will be smaller than expected by 2010 due to reduced productivity growth, population growth, human capital accumulation, and physical capita...