Worldwide trends in esophageal cancer survival, by sub‐site, morphology, and sex: an analysis of 696,974 adults diagnosed in 60 countries during 2000‐2014 (CONCORD‐3)

Abstract

AbstractBackgroundEsophageal cancer survival is poor worldwide, though there is some variation. Differences in the distribution of anatomical sub‐site and morphological sub‐type may help explain international differences in survival for all esophageal cancers combined. We estimated survival by anatomic sub‐site and morphological sub‐type to understand further the impact of topography and morphology on international comparisons of esophageal cancer survival.MethodsWe estimated age‐standardized one‐year and five‐year net survival among adults (15‐99 years) diagnosed with esophageal cancer in each of 60 participating countries to monitor survival trends by calendar period of diagnosis (2000‐2004, 2005‐2009, 2010‐2014), sub‐site, morphology, and sex.ResultsFor adults diagnosed during 2010‐2014, tumors in the lower third of the esophagus were the most common, followed by tumors of overlapping sub‐site and sub‐site not otherwise specified. The proportion of squamous cell carcinomas diagnosed during 2010‐2014 was generally higher in Asian countries (50%‐90%), while adenocarcinomas were more common in Europe, North America and Oceania (50%‐60%). From 2000‐2004 to 2010‐2014, the proportion of squamous cell carcinoma generally decreased, and the proportion of adenocarcinoma increased. Over time, there were few improvements in age‐standardized five‐year survival for each sub‐site. Age‐standardized one‐year survival was highest in Japan for both squamous cell carcinoma (67.7%) and adenocarcinoma (69.0%), ranging between 20%‐60% in most other countries. Age‐standardized five‐year survival from squamous cell carcinoma and adenocarcinoma was similar for most countries included, around 15%‐20% for adults diagnosed during 2010‐2014, though international variation was wider for squamous cell carcinoma. In most countries, survival for both squamous cell carcinoma and adenocarcinoma increased by less than 5% between 2000‐2004 and 2010‐2014.ConclusionsEsophageal cancer survival remains poor in many countries. The distributions of sub‐site and morphological sub‐type vary between countries, but these differences do not fully explain international variation in esophageal cancer survival.