MONDAY, May 19 (HealthDay News) -- Lung cancer patients may be one step closer to the day when the disease can be detected early with a simple blood test.

Scientists slated to report their findings Tuesday at the American Thoracic Society's conference in Toronto say the test -- which tracks gene activity in immune-system cells -- was very good at distinguishing patients with lung cancer from those without the disease.

MONDAY, May 19 (HealthDay News) -- Two new studies give greater incentive for people with obstructive sleep apnea to seek treatment for this disorder.

In one study, Swedish researchers found that stroke victims with obstructive sleep apnea (OSA) die sooner than stroke victims who don't have the sleep disorder or another less common type of it.

The other study, done by Spanish researchers, reports that people with obstructive sleep apnea and hypertension may be able to lower their blood pressure if the breathing condition is treated with continuous positive airway pressure.

SUNDAY, May 18 (HealthDay News) -- Caregivers of deceased lung transplant patients are four to five times more likely to suffer symptoms of depression and post-traumatic stress disorder (PTSD) than the average person, researchers report.

The findings, to be presented at the American Thoracic Society's 2008 International Conference in Toronto on May 19, come from assessing caregivers of all University of Washington lung transplant recipients who had died within the past five years.