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The retention time (RT) values measured in the metastasis between responders and nonresponders on contrast enhanced ultrasound d0, d3, d7, d14, and d42 (responders with complete response [CR] and partial response [PR] [n = 29] vs nonresponder with stable disease [SD] and progressive disease [PD] [n = 21]). CR = complete response, PD = progressive disease, PR = partial response, RT = retention time, SD = stable disease.
