FDA approves Itovebi, a new breast cancer drug for hormone-sensitive, HER2-negative, PIK3CA-mutated cases, doubling progression-free survival to 15 months. Itovebi, inavolisib, is taken with palbociclib and fulvestrant. Common side effects include lab abnormalities, mouth inflammation, diarrhea, fatigue, nausea, rash, decreased appetite, COVID-19 infection, and headache, with a hyperglycemia risk.