An Arkansas doctor has been chosen to study genetic factors that may be responsible for a cancer cluster in Fallon, Nevada. The cluster has sickened 16 children with leukemia since 2000, killing three. The cause of the cluster is unknown despite exhaustive studies, including one by the Centers for Disease Control and Prevention that found higher-than-normal concentrations of arsenic, antimony, tungsten, cobalt and uranium in the western Nevada town of 75 hundred people. But the Centers for Disease Control found no single cause for the leukemias. With 224 thousand dollars from the U-S Environmental Protection Agency, Doctor Jill James of the Arkansas Children`s Hospital Research Institute hopes to build on the C-D-C study and focus her work on any genetic causes for the cluster.