This study is for patients that have been diagnosed with High Risk B-Lymphoblastic Leukemia (HR B-ALL). The investigational drug in this study is Ruxolitinib. The purpose of this study is to find out if the study drug, ruxolitinib, in combination with standard HR B-ALL treatment is safe and effective in children, adolescents, and young adults with HR B-ALL. Participants can expect to be in this study for the treatment period of approximately 26 months (females) or 38 months (males) plus the post-treatment follow-up. Subjects are considered on study during the post-treatment follow-up period until the subject is deceased, lost to follow-up, or until the study is completed. Subjects in this study will be followed until all enrolled subjects have been followed for 3 years from Day 1 or are deceased or lost to follow-up.

This study is for male and female patients who are 65 years of age or older who have chronic lymphocytic leukemia (CLL) that has never been treated before, and their disease has progressed to the point that therapy has been recommended. The purpose of this study is to compare the effects, good and/or bad, of the drug ibrutinib, either alone or in combination with the drug rituximab, with the standard treatment for this disease. The standard treatment is chemotherapy with the drug bendamustine in combination with the drug rituximab. The effects on the patient and their leukemia will be looked at to find out which treatment is better. Both bendamustine and rituximab are approved by the FDA to treat chronic lymphocytic leukemia (your leukemia type), but ibrutinib is considered investigational. In this study, patients will get either the drug ibrutinib alone, or ibrutinib with rituximab, or bendamustine with rituximab. If the patient is in the group that receives bendamustine with rituximab and their disease returns, they will have the option to receive ibrutinib.

To collect information about the patient's leukemia and to seek the optimal treatment for children with ALL based on the individual level of risk of the cancer coming back after treatment. The risk groups are defined as a result of recent research conducted by the Children's Oncology Group (COG). We would like to learn if the use of an experimental intrathecal therapy (ITT), which has been given to many people with ALL and has been well tolerated, would be better at preventing relapse in the central nervous system and improve disease outcomes in children with High Risk ALL.