Table 3. Overall survival (OS) of groups divided by CTLA-4 expression profiles.

Groups	Tumor CTLA-4 expression	Density of CTLA-4+ TIMCs	Number	Mean OS (month)	95% CI
Group 1	High	High	42	43.822	29.041–46.602
Group 2	High	Low	28	45.702	34.167–55.238
Group 3	Low	High	35	49.712	40.068–59.356
Group 4	Low	Low	49	62.705	54.495–70.915

Abbreviations: HR, hazard ratio; CI, confidence interval; OS, overall survival; TIMCs: tumour-infiltrating mononuclear cells; a: P < 0.05.