SAN ANTONIO - A new cancer drug that got its start in San Antonio is showing promising results. The drug, called TDM-1, acts like a laser guided missile, zeroing on cancer cells and destroying them. Dr. Murali Beeram with the Start Center of Cancer Care had the first patient who stabilized her cancer in the first clinical trial. "Till then we didn't know if the drug would work well or not," said Beeram. TDM-1 pairs herceptin with a powerful chemotherapy. The chemo drug doesn't affect other cells when targeting the cancer cells. It's different from other cancer drugs, like the ones Kathy Walker takes. "Most of the ones they give now, like the one I get, does cause nausea, keeps you awake at night," said Walker. "I haven't had any of the joint pain, but they tell me it's coming." News of TDM-1, while still not available to her, may take the edge off her pain. "That would be the neatest thing. It kinda blows your mind to think they have a medicine that can go through your body and find a cancer cell and blow it up," said Walker. The Food and Drug Administration is expected to approve TDM-1. Copyright 2012 by KSAT.com All rights reserved. This material may not be published, broadcast, rewritten or redistributed.