Patient description: The patient is a 20 year old Caucasian female presents to the clinic with one-sided vision lost and facial weakness, dysarthria and numbness lasting for 1 day. She visited her PCP and underwent brain MRI which revealed a single plaque in the brainstem. After few months, she experienced lower extremities weakness led to balance problem. The second MRI revealed another lesion in the left cerebral hemisphere. The diagnosis of Relapsing Remitting Multiple Sclerosis (RRMS) is confirmed after the second MRI. Her past surgical history is significant for a C-section 2 years ago and she has a one child. She is divorced and is not currently in any sexual relationship. She smokes 10 cigarettes per day and drinks alcohol occasionally. She is working as an editor in a publisher company and she is happy that she can keep working from home most of the time. She is under the treatment of RRMS from 7 months ago.

Clinical trial eligibility criteria: eligible ages (years): 1.0-31.0,  B Acute Lymphoblastic Leukemia Central Nervous System Leukemia Ph-Like Acute Lymphoblastic Leukemia Testicular Leukemia Patients must be enrolled on APEC14B1 and consented to Screening on the Part A consent form prior to enrollment on AALL1131 White Blood Cell Count (WBC) Age 1-9.99 years: WBC >= 50 000/uL Age 10-30.99 years: Any WBC Age 1-30.99 years: Any WBC with Testicular leukemia CNS leukemia (CNS3) Steroid pretreatment Patients must have newly diagnosed B lymphoblastic leukemia (2008 World Health Organization [WHO] classification) (also termed B-precursor acute lymphoblastic leukemia); patients with Down syndrome are also eligible Organ function requirements for patients with Ph-like ALL and a predicted TKI-sensitive mutation: patients identified as Ph-like with a TKI-sensitive kinase mutation must have assessment of organ function performed within 3 days of study entry onto the dasatinib arm of AALL1131  With the exception of steroid pretreatment or the administration of intrathecal cytarabine, patients must not have received any prior cytotoxic chemotherapy for either the current diagnosis of B-ALL or any cancer diagnosed prior to the initiation of protocol therapy on AALL1131; patients cannot have secondary B-ALL that developed after treatment of a prior malignancy with cytotoxic chemotherapy; patients receiving prior steroid therapy may be eligible for AALL1131 Patients with BCR-ABL1 fusion are not eligible for post-induction therapy on this study but may be eligible to enroll in a successor Children's Oncology Group (COG) Philadelphia positive (Ph+) ALL trial by day 15 Induction DS HR B-ALL patients with Induction failure or BCR-ABL1 Female patients who are pregnant are ineligible since fetal toxicities and teratogenic effects have been noted for several of the study drugs Lactating females are not eligible unless they have agreed not to breastfeed their infant Female patients of childbearing potential are not eligible unless a negative pregnancy test result has been obtained Sexually active patients of reproductive potential are not eligible unless they have agreed to use an effective contraceptive method for the duration of their study participation