Background: FoundationOne CDx is a cancer genome profiling test that has already been approved by the FDA, but its clinical utility in Japanese patients is unknown. In this study, we examined the clinical utility of FoundationOne CDx.
Methods: 46 samples from 43 Japanese pretreated patients with advanced solid tumors were tested with FoundationOne CDx between September 2018-January 2019.
Results: The median age of 43 patients was 63 years(ranged 18 to 82 years), and among them 24 were males and 19 females. Major cancer types were hepato-biliary and pancreatic(8 cases)and other digestive organs(8 cases). All 27 cases in which genome cancer board had been completed by January 17, 2019 were analyzable, and the number of detected gene mutations(except VUS)was an average of 4.3(ranged 0 to 14)per case. Of the 27 cases, one or more mutations were found in 26 cases(96%), and in all such 26 cases actionable mutations with candidates for therapeutic agents were found. In 4(15%)of them, the treatment corresponding to the gene mutation was performed. Among the cases in which target disease matched and clinical trials of the drug were being conducted in Japan, only one case participated in the trial. The most common reason for not participating in the trial was disease deterioration and PS reduction (33%).
Conclusions: The FoundationOne CDx test showed that it can detect gene mutations in various cancer types in Japanese patients.