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(A) Pretreatment CT scans showing the primary tumour (arrow). (B) The patient underwent PBT. (C) CT scans at 3 months after PBT demonstrating shrinkage of the primary tumour (arrow). (D) CT scans at 8 months after PBT demonstrating complete regression of the primary tumour (arrow). (E) The actuarial CR curves of primary tumour after PBT.
