1.   Federal authorities are investigating whether a urologist gave prostate cancer patients diluted doses of an expensive drug prescribed for the disease.

2.   He proposes to wean criminals off their drug habits by giving them increasingly diluted doses.

3.   Others get diluted doses.

4.   She contends that Courtney gave her diluted doses of Taxol and that the disease spread to other parts of her body.

5.   The diluted doses will be as potent as new ones or they will not be used, health officials said.

6.   Researchers are now inoculating volunteers with diluted doses to see if a weaker vaccine will still provide protection.