A blood sample drawn from cancer patient Deborah Charles will be tested to monitor whether chemotherapy has caused red and white blood cell counts to drop too low during a weekly test at Georgetown University Hospital's Lombardi Cancer Center in Washington May 23, 2007. Since Charles, a journalist for Reuters, was diagnosed with breast cancer in November 2006, she has had to back away from actively covering the news and has had three operations, four rounds of chemotherapy and has been visiting the hospital at least once a week for appointments and treatment. Photo taken May 23, 2007. To match feature WITNESS-CANCER/DISCOVERY REUTERS/Jim Bourg (UNITED STATES)