21.   One important concern was that the two studies involved a small number of patients.

22.   Provan found a medical study involving young sickle cell sufferers who were cured by a bone marrow transplant.

23.   Psychiatric researchers say animal studies involve doses of ketamine much higher than those used in their research.

24.   Rosenzweig noted that the study involves only one variable, rainfall, and applies to only one part of the world.

25.   Some studies involve the use of over-the-counter drugs that give researchers information that can be applied to other drugs.

26.   The new study involved a calcium channel blocker known as isradipine, or DynaCirc.

27.   The other studies involved teams from Johns Hopkins, the Pasteur Institute in Paris, and Helsinki University in Finland.

28.   The new study involved patients whose tumors were diagnosed relatively early, when they were still apparently confined to the walnut-shaped gland.

29.   The studies have involved only animal brains, which may be vastly different from humans, he said.

30.   The studies involved several hundred individuals, some of whom had taken AZT previously, others who were taking it for the first time in the new studies.