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Clinical course monitoring in renal cell carcinoma (RCC) patients with circulating tumor DNA (ctDNA). Clinical course was analyzed using mutant allele frequency (MAF) of ctDNA by droplet digital PCR (ddPCR), and cell‐free DNA (cfDNA) fragment size by a microfluidics‐based platform in RCC patients with ctDNA. PD, progressive disease. A, In case 45, MAF of ctDNA was evaluated in TP53 and VHL. B, In case 53, MAF of ctDNA was evaluated in MTOR and TSC1
