• E R C Hagens, M L Feenstra, W J Eshuis, Hulshof M C C M MCCM Department of Radiotherapy, Amsterdam University Medical Centres, Location AMC, University of Amsterdam, Cancer Centre Amsterdam, Amsterdam, the Neth, van Laarhoven H W M HWM Department of Medical Oncology, Amsterdam University Medical Centres, Location AMC, University of Amsterdam, Cancer Centre Amsterdam, Amsterdam, t, M I van Berge Henegouwen, and S S Gisbertz.
• Department of Surgery, Amsterdam University Medical Centres, Location AMC, University of Amsterdam, Cancer Centre Amsterdam, Amsterdam, the Netherlands.
• Br J Surg. 2020 Jul 1; 107 (8): 1053-1061.

BackgroundConditional survival accounts for the time already survived after surgery and may be of additional informative value. The aim was to assess conditional survival in patients with oesophageal cancer and to create a nomogram predicting the conditional probability of survival after oesophagectomy.MethodsThis retrospective study included consecutive patients with oesophageal cancer who received neoadjuvant chemoradiation followed by oesophagectomy between January 2004 and 2019. Conditional survival was defined as the probability of surviving y years after already surviving for x years. The formula used for conditional survival (CS) was: CS(x|y)  = S(x + y) /S(x) , where S(x) represents overall survival at x years. Cox proportional hazards models were used to evaluate predictors of overall survival. A nomogram was constructed to predict 5-year survival directly after surgery and given survival for 1, 2, 3 and 4 years after surgery.ResultsSome 660 patients were included. Median overall survival was 44·4 (95 per cent c.i. 37·0 to 51·8) months. The probability of achieving 5-year overall survival after resection increased from 45 per cent directly after surgery to 54, 65, 79 and 88 per cent given 1, 2, 3 and 4 years already survived respectively. Cardiac co-morbidity, cN category, ypT category, ypN category, chyle leakage and pulmonary complications were independent predictors of survival. The nomogram predicted 5-year survival using these predictors and number of years already survived.ConclusionThe probability of achieving 5-year overall survival after oesophagectomy for cancer increases with each additional year survived. The proposed nomogram predicts survival in patients after oesophagectomy, taking the years already survived into account.© 2020 The Authors. BJS published by John Wiley & Sons Ltd on behalf of BJS Society Ltd.

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