PIK3CA and neoplasm: However, unfortunately, the patient’s disease progressed again after six-month of the treatment, and his ctDNA testing showed that all the previous detected tumor specific mutations elevated to an even higher level compared to pretreatment (PIK3CA-Q546K, 19.9%; TP53-DISCIFP1 fusion, 29.1%; 4.1 folds of relative copy number gain of AR), as well as a newly emerged RB1 single copy number loss.