Prognostic significance of CD45 intensity. Kaplan-Meier survival plots of patients classified as shown in Table 2. ——, CD45⁻ or intensity in dimmest quartile; –––, CD45 intensity in second quartile; ---, CD45 intensity in third quartile; ⋅⋅⋅, CD45 intensity in brightest quartile. The curves are significantly different (P < .001).