A COG trial ( 74 ) reported the detection of ctDNA in the serum of 41/50 (82%) and urine of 13/50 (26%) patients with stage III/IV disease, and the agreement between serum ctDNA and tumor sequencing results was highly significant.
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The sentences
Although this skewing did not reach statistical significance, it agrees with the conclusion of most recent studies that MYCN mutations have prognostic value, whether anaplastic or not. 4.