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MIAMI –– When the eye cancer retinoblastoma is diagnosed in racial and ethnic minority children whose families don't have private health insurance, it often takes a more invasive, potentially life-threatening course than in other children, probably because of delays in diagnosis, Dana-Farber/Children's Hospital Cancer Center (DF/CHCC) researchers will report at the 26th annual meeting of the American Society of Pediatric Hematology Oncology being held in Miami, April 24-27.

MIAMI--The stem cell transplant regimen that was commonly used in the United States to treat advanced neuroblastoma in children appears to be more toxic than the equally effective regimen employed in Europe and Egypt, according to a new study being presented at the 26th annual meeting of the American Society of Pediatric Hematology Oncology in Miami April 24-27. The U.S. regimen was associated with more acute toxicity to the kidneys and liver.

CHICAGO --- With the help of genetics, prostate specific antigen (PSA) screenings may become more accurate and reduce the number of unnecessary prostate biopsies, according to a new study from Northwestern Medicine®.

Personalized PSA testing using genetic variants could account for an 18 percent reduction in the number of men who likely would have undergone unnecessary biopsies, according to the study. It will be published in the May 2013 issue of The Journal of Urology.

Chevy Chase, MD—More than a quarter of a century after the Chernobyl nuclear disaster, many children and teenagers who developed thyroid cancer due to radiation are in complete or near remission, according to a recent study accepted for publication in The Endocrine Society's Journal of Clinical Endocrinology & Metabolism (JCEM).

PHILADELPHIA — A mutation in a protein called menin causes a hereditary cancer syndrome called MEN1 (multiple endocrine neoplasia type 1). Individuals with MEN1 are at a substantially increased risk of developing neuroendocrine tumors, including cancer of the pancreatic islet cells that secrete insulin.

Peripartum cardiomyopathy (PPCM) is a deterioration in cardiac function that occurs in pregnant women during the last month or in the months following their pregnancy. This disorder can occur in women with no prior history of heart disease and the causes are not well understood.

Peripartum cardiomyopathy (PPCM) is a deterioration in cardiac function that occurs in pregnant women during the last month or in the months following their pregnancy. This disorder can occur in women with no prior history of heart disease and the causes are not well understood. In this issue of the Journal of Clinical Investigation, Ingrid Struman and colleagues at the University of Liege in Liege, Belgium, identified a molecule, miR-146a, that can serve as a biomarker for peripartum cardiomyopathy.

Pancreatic beta cells store and release insulin, the hormone responsible for stimulating cells to convert glucose to energy. The number of beta cells in the pancreas increases in response to greater demand for insulin or injury, but it is not clear if the new beta cells are the result of cell division or the differentiation of a precursor cell, a process known as neogenesis. Knowledge of how beta cells are created and maintained is critical to understanding diseases in which these cells are lost, such as diabetes.

STANFORD, Calif. — Stanford University School of Medicine scientists have created a mouse model of muscular dystrophy in which degenerating muscle tissue gives off visible light.

The observed luminescence occurs only in damaged muscle tissue and in direct proportion to cumulative damage sustained in that tissue, permitting precise monitoring of the disease's progress in the mice, the researchers say.

New, low-tech teaching techniques used by novice instructors may improve training for healthcare providers in performing cardiopulmonary resuscitation (CPR) on children who suffer cardiac arrest. Researchers in a large multicenter study say their findings hold the potential to standardize and upgrade life support training by hundreds of thousands of instructors around the world.

URBANA – Although U.S. cattle genetics are exported all over the world in the form of frozen semen, the same is not true for pigs because boar semen does not freeze well. In an attempt to improve semen storage and pig reproduction, animal scientists at the University of Illinois are looking at how sperm survives in the sow oviduct.

A team of Virginia Tech researchers has discovered that humans are passing antibiotic resistance to wildlife, especially in protected areas where numbers of humans are limited.

In the case of banded mongoose in a Botswana study, multidrug resistance among study social groups, or troops, was higher in the protected area than in troops living in village areas.

The study also reveals that humans and mongoose appear to be readily exchanging fecal microorganisms, increasing the potential for disease transmission.

CINCINNATI – Researchers report in Nature Genetics they have increased the number of confirmed genes linked to juvenile idiopathic arthritis (JIA) from three to 17 – a finding that will clarify how JIA fits into the spectrum of autoimmune disorders and help identify potential treatment targets.

CINCINNATI—Researchers at the University of Cincinnati have found that targeted screening for populations with a higher estimated prevalence for hepatitis C may be cost-effective.

These findings, published in the April 24, 2013, online edition of the journal Clinical Infectious Diseases, indicate that targeted screening for chronic hepatitis C virus infection is cost-effective when the prevalence of hepatitis C in a population exceeds 0.84 percent (84/10,000).

University of Nebraska-Lincoln materials engineers have developed a structural nanofiber that is both strong and tough, a discovery that could transform everything from airplanes and bridges to body armor and bicycles.

Their findings are featured on the cover of this week's April issue of the American Chemical Society's journal, ACS Nano.

"Whatever is made of composites can benefit from our nanofibers," said the team's leader, Yuris Dzenis, McBroom Professor of Mechanical and Materials Engineering and a member of UNL's Nebraska Center for Materials and Nanoscience.