Fig. 8

Elevated SPI1 expression is associated with poor prognosis in laryngeal and hypopharyngeal cancer patients. a Validation of SPI1 expression in a local cohort of laryngeal cancer patients. b Kaplan‒Meier survival curve and c multivariate Cox forest plot for laryngeal cancer patients. d Validation of SPI1 expression in a local cohort of hypopharyngeal cancer patients. e Kaplan‒Meier survival curve and f multivariate Cox forest plot for hypopharyngeal cancer patients. For Kaplan‒Meier analyses (b, e), follow-up was truncated at 1000 days to ensure stable risk set sizes and avoid overinterpretation of sparse late follow-up