BOSTON, Massachusetts, Feb. 17 -- Harvard Medical School issued the following news: * * * Research Pinpoints Weakness in Lung Cancer's Defenses Scientists uncover an enzyme that boosts cancer cell metabolism to fuel growth By CATHERINE CARUSO At a glance: * Researchers discovered the importance of an enzyme that promotes growth of certain lung cancers. * The enzyme, GUK1, supports metabolism in cancer cells to help tumors grow. * In the future, GUK1 could become a possible target for lun  more