B Acute Lymphoblastic Leukemia with t(4;11)(q21;23.3); KMT2A-AFF1

**Semantic type:** Neoplastic Process

**Definition:** A B-cell acute lymphoblastic leukemia associated with t(4;11)(q21;23.3). This translocation leads to the generation of the fusion gene KMT2A-AFF1.

**Synonyms:** - Acute Lymphoblastic Leukemia with t(4;11)(q21;23) - B Acute Lymphoblastic Leukemia with t(4;11)(q21;23.3) - B Acute Lymphoblastic Leukemia with t(4;11)(q21;23.3); KMT2A::AFF1 - B-Cell Acute Lymphoblastic Leukemia with t(4;11)(q21;23.3)