FRIDAY, March 12 (HealthDay News) -- MRI scans are more likely to turn up undiagnosed tumors in the breasts of postmenopausal women who already had cancer in their other breast, researchers report.

FRIDAY, March 12 (HealthDay News) -- Poor, minority adults with moderate to severe chronic kidney disease are far more likely to progress to kidney failure than are whites with the disease, a new U.S. study has found.

FRIDAY, March 12 (HealthDay News) -- Acts of kindness spread rapidly, and it takes only a few people acting cooperatively to influence dozens of others, U.S. researchers report.

FRIDAY, March 12 (HealthDay News) -- The anti-clotting drug Plavix must now carry a "black box" warning on its label, alerting patients and doctors that some people don't metabolize the medication properly, U.S. health officials said Friday.

FRIDAY, March 12 (HealthDay News) -- Boston Scientific's Express LD Iliac Stent has been approved by the U.S. Food and Drug Administration to treat iliac artery disease, the company said in a news release.

FRIDAY, March 12 (HealthDay News) -- No matter how cheerful you felt as you wiggled your toes in the sand on that secluded beach, no matter how thrilled you were to finally lay eyes on that Renaissance masterpiece, your vacation bliss won't last long.

FRIDAY, March 12 (HealthDay News) -- Doctors and patients often have different expectations for knee and hip replacement surgery, and steps should be taken to close that gap, a new study shows.

FRIDAY, March 12 (HealthDay News) -- If diabetics start the drug metformin early -- within three months of diagnosis -- it appears the drug will remain effective longer, a new study finds.

FRIDAY, March 12 (HealthDay News) -- Children with behavioral problems are at increased risk for chronic pain when they reach adulthood, new Scottish research has found.

FRIDAY, March 12 (HealthDay News) -- A new type of urine test shows that eating plenty of garlic may lower levels of a cancer-causing process within the body.

FRIDAY, March 12 (HealthDay News) -- Pro football players are more likely to suffer certain types of knee and ankle injuries on an artificial turf called FieldTurf than on natural grass, a new study contends.

FRIDAY, March 12 (HealthDay News) -- Most people will welcome the start of daylight savings time this Sunday because it starts to stay light longer, even if that means the early mornings will be dark once again.

(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:

FRIDAY, March 10 (HealthDay News) -- An extract from dried papaya slows the growth of cancer cells in the laboratory, researchers report.

(HealthDay News) -- An epidural is an injected anesthetic often used during labor and delivery to ease the pain of childbirth.

FRIDAY, March 12 (HealthDay News) -- Good news for women who have used birth control pills: A long-term study finds that those who took oral contraceptives at some point in their lives have a lower risk of death than women who never took the "Pill".

(HealthDay News) -- Ketoacidosis occurs when diabetic people develop dangerously high levels of ketones, which are produced when stored fat is burned for energy.