Cancer specialists clashed Wednesday over a Medicare proposal to test new ways to pays for drugs given in doctor's offices and hospital outpatient clinics. The proposal by the Center for Medicare and Medicaid Services applies to Part B drugs, a class that covers certain cancer drugs, antibiotics and eye-care medications. Some cancer drugs are among the costliest on the market, ranging from $9,000 to $100,000 a month, according to America's Health Insurance Plans.