Stratification of patients according to the International Prognostic Index for CLL (CLL-IPI) was performed in 53 patients for whom we possessed the necessary data, namely age at diagnosis, Binet stage, serum β2-microglobulin, IGHV SHM status and TP53 mutations and/or del17p13 (in 15/53 patients CLL-IPI scores were calculated without the information about TP53 mutational status (Table 1). This evidence concerns the gene TP53 and B-cell chronic lymphocytic leukemia.