In recent years, researchers have focused on developing ways to deliver drugs like chemotherapy agents specifically to cancer cells to minimize treatment side effects.  However, this effort is not without challenges — drugs can get diluted in body fluids or not travel deeply enough through tissues to reach the cancer cells. A new study identifies a potential natural, self-propelled carrier to deliver helpful drugs to cancers in the female reproductive tract: sperm.Read the whole story at Bioengineering Today: Using Sperm to Deliver Cancer Drugs.