Fig. 4From: A prospective study on tumour response assessment methods after neoadjuvant endocrine therapy in early oestrogen receptor-positive breast cancerIdentification of a tumour cellularity size (TCS) cut-off value to discriminate patients according to their response to NET. (A–B) Ki67 levels at surgery (A) and ∆Ki67 (B) in tumours with low (quartile 1, Q1) versus high (Q2, Q3 and Q4) TCS. p values were calculated using Mann Whitney testBack to article page