Good prognosis in ALL is associated with all except?
**Core Concept**
Good prognosis in Acute Lymphoblastic Leukemia (ALL) is associated with several clinical and biological factors. The treatment outcomes in ALL have significantly improved with the identification of these favorable prognostic factors.
**Why the Correct Answer is Right**
One of the key factors determining the prognosis in ALL is the presence of specific genetic abnormalities. Patients with **t(12;21)(p13;q22) translocation**, resulting in the ETV6-RUNX1 fusion, have a favorable prognosis. This genetic abnormality is associated with a higher response rate to therapy and improved overall survival. Additionally, patients with **low white blood cell count at diagnosis** (less than 50,000/ΞΌL) also have a better prognosis.
**Why Each Wrong Option is Incorrect**
* **Option A:** While high levels of **CD10 expression** are often associated with a favorable prognosis in ALL, it is not the only factor determining the prognosis. Other factors, such as genetic abnormalities and white blood cell count, are also crucial.
* **Option B:** **T-cell ALL** is generally associated with a poorer prognosis compared to B-cell ALL, especially in adults. However, some subtypes of T-cell ALL may have a more favorable prognosis.
* **Option C:** **Age less than 1 year at diagnosis** is actually associated with a poorer prognosis in ALL, likely due to the presence of more aggressive disease and higher rates of relapse.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that the prognosis in ALL is determined by a combination of clinical, biological, and genetic factors. A thorough understanding of these factors is crucial for making informed treatment decisions and predicting patient outcomes.
**Correct Answer:** B. T-cell ALL