B Acute Lymphoblastic Leukemia, Philadelphia Chromosome Negative

**Semantic type:** Neoplastic Process

**Definition:** A B acute lymphoblastic leukemia (B-ALL) that does not have the cytogenetic abnormality t(9;22)(q34;q11.2). Most cases of B-ALL do not have this translocation.

**Synonyms:** - Acute Lymphoblastic Leukemia, Philadelphia Chromosome Negative - B-Cell Acute Lymphoblastic Leukemia, Philadelphia Chromosome Negative - Ph1-Negative ALL - Ph1-Negative Acute Lymphoblastic Leukemia - Philadelphia Chromosome Negative ALL - Philadelphia Chromosome Negative Acute Lymphoblastic Leukemia - Philadelphia-Negative ALL - Philadelphia-Negative Acute Lymphoblastic Leukemia - Precursor B Lymphoblastic Leukemia, Philadelphia Chromosome Negative - Precursor B-Lymphoblastic Leukemia, Philadelphia Chromosome Negative