**Question:** t (2;8) is characteristically seen with -

A. Acute promyelocytic leukemia (APL)
B. Chronic myeloid leukemia (CML)
C. Acute lymphoblastic leukemia (ALL)
D. Chronic myeloid leukemia (CML)

**Correct Answer:** .

**Core Concept:**
t (2;8) is a specific chromosomal abnormality involving chromosomes 2 and 8. In medical genetics, translocations occur when portions of two different chromosomes fuse together, leading to abnormal gene expression and dysfunction. This chromosomal rearrangement is associated with specific types of leukemia.

**Why the Correct Answer is Right:**
t (2;8) is typically found in acute promyelocytic leukemia (APL). This chromosomal abnormality results in the fusion of the PML (Promyelocytic Leukemia) gene on chromosome 15 and the RARA (Retinoic Acid Receptor Alpha) gene on chromosome 17. This fusion protein alters the differentiation of promyelocytes, leading to the characteristic features of APL.

**Why Each Wrong Option is Incorrect:**

A) Chronic myeloid leukemia (CML) is associated with the Philadelphia chromosome (Ph), resulting from the fusion of chromosomes 9 and 22 (bcr-abl fusion gene). t (2;8) is different from the Ph chromosome seen in CML.

B) Chronic myeloid leukemia (CML) is a myeloproliferative disorder with a specific genetic abnormality (Ph chromosome) and is not related to t (2;8).

C) Acute lymphoblastic leukemia (ALL) is characterized by a different set of genetic abnormalities and is distinct from t (2;8) and APL.

D) Chronic myeloid leukemia (CML) is associated with the Ph chromosome (bcr-abl fusion gene) and is not related to t (2;8) and APL.

**Clinical Pearls:**
APL is a subtype of acute myeloid leukemia (AML) with distinct clinical features. It is often associated with a high risk of bleeding due to impaired platelet function and infections due to neutropenia. Treatment typically involves all-trans retinoic acid (ATRA) and anthracycline chemotherapy (e.g., daunorubicin).

**Why Each Wrong Option is Incorrect:**

A) Chronic myeloid leukemia (CML) is a myeloproliferative disorder with a specific genetic abnormality (Ph chromosome) and is not related to t (2;8) and APL.

B) Chronic lymphoblastic leukemia (CLL) is a lymphoproliferative disorder characterized by different genetic abnormalities and is distinct from t (2;8) and APL.

C) Acute lymphoblastic leukemia (ALL) is another subtype of acute leukemia with different genetic changes and distinct clinical features, not related to t (2;8) and APL.

D) Chronic myeloid leukemia (CML) is a myeloproliferative