A new wave of prescription drugs that offer hope for improved treatment of chronic, debilitating diseases could become a health care tsunami as more of the drugs hit the market and drive up costs. Known as specialty pharmaceuticals, or biologics, the new drugs are targeting such diseases as cancer, multiple sclerosis, rheumatoid arthritis and psoriasis. They\'re credited with providing such benefits as giving some rheumatoid arthritis sufferers the ability to work and dress themselves. James Leisen, head of rheumatology at Henry Ford Hospital and program director for division of rheumatology at Wayne State University , said the biologics he uses to help treat rheumatoid arthritis sufferers get significantly better results than other therapies. \"Twenty years ago, we used gold shots,\" Leisen said. They helped about one-third of patients, he said. \"Then Methotrexate came along in the \'80s. It was a great advance. With Methotrexate, over 50 percent would get better.\"