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Overall survival stratified by tumour regression grade (TRG) in patients treated by neoadjuvant therapy or surgery alone. Survival of patients with TRG1, 2 or 3 tumours was similar, and markedly different from patients with TRG4 or 5 tumours. Survival of patients treated with surgery alone was similar to that of patients treated with chemotherapy plus surgery with TRG4 or 5 tumours.
