Displaying 7 results of Alpelisib Stable Isotopes Alpelisib is a selective inhibitor of the PI3K alpha isoform used in the treatment of breast cancer. Stable isotopes are non-radioactive forms of elements that can be used in research and medicine. Alpelisib stable isotopes are labeled versions of the drug used in studies to track its distribution and metabolism in the body. They can aid in drug development and provide insight into the drug's pharmacokinetics and pharmacodynamics.