TITLE : Circulating tumor polynucleotide assay in xenograft models ABSTRACT : Provided herein is an assay for detecting circulating tumor polynucleotides (e.g., circulating tumor DNA (ctDNA)) in xenograft models using amplification of multi-copy human-specific genetic sequences.Classify the above INPUT TEXT into ONE OF these CATEGORIES ONLY (NO OTHER CATEGORIZATION SHOULD BE DONE):Brain Disorders, Cancer, Immunology & Inflammation,   Rare Blood Disorders, Rare Diseases,Vaccines,General Wellness,Infection. JUST GIVE CATEGORY NAME NO EXPLANATION IS REQUIRED