The impact of reclassifying cancers of unspecified histology on international differences in survival for small cell and non‐small cell lung cancer (ICBP SurvMark‐2 project)

Survival from lung cancer remains low, yet is the most common cancer diagnosed worldwide. With survival contrasting between the main histological groupings, small‐cell lung cancer (SCLC) and non‐small cell lung cancer (NSCLC), it is important to assess the extent that geographical differences could be from varying proportions of cancers with unspecified histology across countries. Lung cancer cases diagnosed 2010‐2014, followed until 31 December...