The authors of the article [1] have advised that there is an errors:
In Figure 2, the legend describing the curves representing the results has been changed, which notably alters the meaning of the results and may be misleading.
Fig. 2
Overall survival (A) and progression-free survival (B) in treatment-naive accelerated chronic lymphocytic leukemia patients treated with fludarabine vs. other treatment regimens
OS – overall survival, PFS – progression-free survival

Correct Fig. 2.
Fig. 2
Overall survival (A) and progression-free survival (B) in treatment-naive accelerated chronic lymphocytic leukemia patients treated with fludarabine vs. other treatment regimens
OS – overall survival, PFS – progression-free survival

It was wrongly given as:
The article has since been corrected online.