Tumour response following preoperative chemotherapy is affected by body mass index in patients with colorectal liver metastases

Figure 1 Tumour regression grade for colorectal liver metastases after preoperative chemotherapy. A: Tumour regression grade 1 (TRG1), no residual cancer cells; B and C: TRG2, rare scattered residual cancer cells within fibrosis; D: TRG3, more residual tumour cells but fibrosis remains predominant; E: TRG4, residual tumour cells predominant; F: TRG5, absence of regressive changes.