RB1 and neoplasm: Regarding specificity, the numbers for the phospho-Rb S249 and the p39 scores were 67.65% and 100%, respectively, meaning that 67.65% of the tumor samples with low scores for phospho-Rb S249 score were also of low grade, while none of the tumor samples negative for p39 were of a higher stage or had metastasis to lymph nodes or distant sites.