Fig. 5

Frequencies of intratumoral CD39⁺ Treg and patient outcome. Preliminary data on cumulative cancer-specific survival (A) and cumulative relapse-free survival (B), of group I patients (≥ 75% of CD39-expressing Treg) and group II (< 75% of CD39-expressing Treg). Kaplan–Meier curves are color-coded for patients belonging to group I (n = 31; red) and II (n = 13; blue) and the number at risk in each group at specified time-points is depicted below each graph. Small vertical bars on the Kaplan–Meier curves indicate censoring