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Cycle threshold (Ct) values of PCR fragments of Alu element and cfDNA integrity of plasma samples obtained before (Pre) and after (Post) the first cycle of vaccination. (A) Ct values of total cfDNA (Alu-115), (B) tumor cell-derived cfDNA (Alu-247), (C) the cfDNA integrity (Alu-247/115). ns, not significant; cfDNA, circulating cell-free DNA.
