1.   Dr. Edward A. Stadtmauer of the University of Pennsylvania said that despite the discouraging results thus far, other studies still underway might show the treatment works.

2.   Other studies underway will measure the benefits of combinations or sole usage of drugs versus devices and versus doing nothing at all.

3.   So the only study underway now tracks teen-agers who have left the rolls, and the preliminary results are troubling.

4.   The additional studies underway by Merck will show if Crixivan can slow the disease and prolong life, as expected.

5.   The company already has three other interim studies underway evaluating the drug in different combinations.