Figure 2

Probability of recurrence-free survival of different histologic prognostic groups. (A) In grouping scheme 1, the papillary predominant subtype was designated in the low-grade group, along with lepidic- and acinar predominant subtypes. The low-grade group had significantly lower probability of recurrence (P = 0.005). (B) Grouping scheme 2 combined papillary-, solid- and micropapillary predominant subtypes as the high-grade group. The difference of probability of RFS between the low- and the high-grade groups failed to reach statistical significance (P = 0.181).