“…Patient and tumour characteristics examined were: sex (male or female), age (continuous), preoperative stenting (yes or no), NAC (yes or no), surgery type (TTO versus THO), resection outcome (R0 or R1), lymphovascular invasion (yes or no), pathological stage (pT0 N0, pT1–2 N0, pT1–2 N1, pT1–2 N2–3, pT3–4 N0, pT3–4 N1, pT3–4 N2–3), pathological grade (poorly differentiated, moderately differentiated, well differentiated or complete pathological response), Mandard tumour regression score (1, 2–3, 4–5, or not applicable) and adjuvant treatment (none, chemotherapy or chemoradiotherapy). Time to recurrence was considered to be less relevant, particularly as most recurrences after oesophagectomy occur within 2 years4, 5, 6. It was therefore decided to treat the outcome ‘recurrence’ as a categorical variable using logistic regression.…”