In our previous study (CCCG-NHL-2010), two-year EFS was 100% for Stage I, 91.3% ± 6.1% for Stage II, 75.8% ± 4.4% for Stage III, 56.3% ± 13.5% for Stage IV, and 36.4% ± 14.5% for B-AL, respectively. To improve survival for pediatric patients with B-NHL/B-AL, the investigators launched a new study in China. Compared with our previous treatment regimens (CCCG-2009), patients with stage III and LDH>4 times NL, any stage IV or B-AL were stratified into R4. The dose of methotrexate was increased to 5000mg/m2 for patients in R3 or R4 (previously 3000mg/m2). Four injections of rituximab was added to the chemotherapy for patients in R4. Our aim is to test whether adding rituximab or high dose of methotrexate (5000mg/m2) would improving 2-year EFS for patients in advanced groups.