GAS6 and neoplasm: Other CNVs of tumor-associated genes were detected in five patients (six positive CSF ctDNA samples) with decreased AR copy numbers, five patients had decreased CD274 copy numbers, three patients each has a decreased PDCD1LG2 copy number, two patients each has an increase in FGFR2, CCNE1, or NKX2–1 copy numbers, respectively, and one patient had increased TIAF1, GAS6, or IL6 copy numbers, or reduced CSNK2A1, JAK2, MED12, or SMAD4 copy numbers.