Paradoxical Response to Neoadjuvant Therapy in Undifferentiated Pleomorphic Sarcoma: Increased Tumor Size on MRI Associated with Favorable Pathology.

In contrast, in the chemoradiation group, pR showed a slight increase, while pNR generally shrank, although these differences did not reach statistical significance.

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Kendall’s W concordance coefficient exceeded 0.85 for all measures, with corresponding p -values below 1 × 10 −12 , indicating highly significant agreement.

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