The purpose of this study is to evaluate different drug doses of an experimental drug called SNV4818 and identify safe levels in patients with an advanced cancer that has a mutation (change) in their PIK3CA gene and who have not responded well to other treatments. Once a dose is deemed safe, SNV4818 will be given to participants in combination with another drug called fulvestrant (a treatment approved by the U.S. Food and Drug Administration for a certain type of advanced breast cancer) to assess safety and evaluate whether the medications have the potential to shrink or slow the growth of cancer when given together. The PIK3CA gene helps to make a protein that assists in carrying signals in the cells to control its growth. When the protein is mutated, it becomes more active than in normal cells. SNV4818 has been designed to specifically interrupt this signaling in cancer cells and leave the cells without the mutations (normal cells) alone.
SNV4818-101: A Phase 1, Open-Label Dose Escalation and Expansion Study of SNV4818 as Monotherapy or in Combination with other Anticancer Agents in Participants with Advanced Solid Tumors