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. 2022 Jun 23;149(5):1811–1823. doi: 10.1007/s00432-022-04103-0

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Fig. 2 — Overview of the prevalence of LSPTs in patients with ESCC. CI confidence interval; ESCC, esophageal squamous cell carcinoma; LSPT lung second primary tumor; I² inconsistency index; τ² tau-squared represents the extent of variation among the effects observed in different studies. ^aHu et al. excluded all lung squamous cell carcinoma (n = 11), which occurred within the first 5 years after the diagnosis of ESCC, as potential LSPTs