4 | CONCLUSIONS
We reported a case of G-CSF-producing UCC that showed rapid disease progression after definitive chemoradiotherapy leading to an overall survival period of 5 months. The aggressive behavior of this tumor against conventional treatment was in line with the findings described in previous reports on G-CSF-producing UCCs. This study is the first report describing the somatic mutation profile of G-CSF-producing UCC. The data presented will expand our biological understanding of this cancer subset, which warrants further investigation.