THURSDAY, Feb. 18 (HealthDay News) -- Researchers have found a way to analyze the "fingerprint" of a cancer, and then use that fingerprint to track the trajectory of that particular tumor in that particular person.

THURSDAY, Feb. 18 (HealthDay News) -- Researchers report that they've developed an inexpensive way to keep vaccines stable without the use of refrigerators or freezers, even in the high temperatures of the tropics.

THURSDAY, Feb. 18 (HealthDay News) -- Variations in one gene are associated with athletic endurance and may make a difference in a runner's performance, a new study has found.

THURSDAY, Feb. 18 (HealthDay News) - A new label warning will caution users of four widely used asthma drugs to avoid using these medicines as a sole or long-term means of symptom control, the U.S. Food and Drug Administration announced Thursday.

THURSDAY, Feb. 18 (HealthDay News) -- Childhood leukemia rates more than doubled in a southern Iraq province over a 15-year period, although the exact cause for the increase is unclear, researchers say.

THURSDAY, Feb. 18 (HealthDay News) -- Bone-anchored hearing aids provide noticeable hearing improvement for children and teens with single-sided deafness, a new study finds.

THURSDAY, Feb. 18 (HealthDay News) -- Almost all people who illegally use or abuse opioid painkillers such as Oxycontin or Vicodin get the drugs from a friend or relative who had a prescription, a new report shows.

THURSDAY, Feb. 18 (HealthDay News) -- As women age, they receive fewer benefits from frequent screening for human papillomavirus (HPV) and vaccinations to prevent the virus, new research shows.

THURSDAY, Feb. 18 (HealthDay News) -- The U.S. Food and Drug Administration is defending its decision in late January to approve a new diabetes drug, Victoza (liraglutide), even though animal studies suggest it might increase the risk for a rare thyroid cancer.

(HealthDay News) -- Here are the latest clinical trials, courtesy of ClinicalConnection.com:

Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

THURSDAY, Feb. 18 (HealthDay News) -- Too many American seniors who need a new kidney have to wait longer than necessary for a transplant, researchers say.

THURSDAY, Feb. 18 (HealthDay News) -- An amino acid called isoleucine may play an important role in weight loss, a new study suggests.

THURSDAY, Feb. 18 (HealthDay News) -- Hormone replacement therapy does not lower the odds of heart trouble in women who take the regimen to ease hot flashes and other symptoms of menopause, a new study reports.

THURSDAY, Feb. 18 (HealthDay News) -- New research suggests that there's a difference between people who have migraines a lot and those who have them less often: The most frequent sufferers are in worse health overall, poorer and more depressed.

THURSDAY, Feb. 18 (HealthDay News) -- Young drivers who are overtired from lack of sleep or poor quality sleep are twice as likely to have a car crash, Italian researchers report.

THURSDAY, Feb. 18 (HealthDay News) -- For those with the common mental illness known as generalized anxiety disorder, a new study has found that the brain processes emotions in abnormal ways.

(HealthDay News) -- Dyslexia is a reading disability that can affect people of any age. But the initial signs often appear in early childhood, the Nemours Foundation says.

(HealthDay News) -- Some babies are born with a heart murmur, which is a noise that blood makes as it flows through the heart. Most often, heart murmurs are considered harmless, says the American Academy of Family Physicians.