RESUMO
<p><b>OBJECTIVE</b>To investigate the influence of bone marrow blasts ratio after induction chemotherapy for 2 weeks in patients with PhALL, and it's influence on complete remission (CR) and overall prognosis.</p><p><b>METHODS</b>A total of 172 patients with PhALL in our hospital from March 2012 to February 2016 were selected. The bone marrow blast ratio was analyzed by the receiver-operating characteristic curve (ROC) in patients after induction chemotherapy for 2 weeks, at same time its influence on CR and overall prognosis of PhALL patients was evaluated.</p><p><b>RESULTS</b>The cutoff value of CR was 0.075, its area under ROC was 0.763; the comparison of area under ROC with A=0.5 showed statistically significant difference, therefore 172 patients with PhALL were grouped according to bone marrow blast ratio after induction chemotherapy for 2 weeks: 104 cases (60.5%) with bone marrow blast ratio <0.075, 68 cases (39.5%) with bone marrow blast ratio ≥0.075. The PhALL patinets with bone marrow blast ratio <0.075 who achieved CR and finally achieved CR after induction chemotherapy for 4 weeks acconnted for 89 (85.6%) and 99(95.2%) respectively, which were significantly higher than those in PhALL patients with bone marrow blast ratio≥0.075, [29(42.6%) and 52 (76.5%)](P<0.05). In addition, the influencing factor clinically reducing the OS and DFS rate of patients and enhancing the ralapse rate of patients were mainly chemotherapy, the failure of induction chemotherapy (patients did not achieve CR after induction therapy for 4 weeks), the bone marrow blast ratio≥0.075 after induction treatment for 2 weeks, and CNSL at diagnosis and so on, while the enhaced WBC count at diagnosis was poor factor affecting the DFS rate of patients.</p><p><b>CONCLUSION</b>After induction chemotherapy for 2 weeks, the elevated bone marrow blast ratio in PhALL patients will be infavourable to CR, and the overall prognosis is poor.</p>