Good prognosis factors of ALL are all except ?
**Core Concept**
The prognosis of Acute Lymphoblastic Leukemia (ALL) is influenced by various factors, including age, white blood cell count, cytogenetic abnormalities, and response to initial therapy. In pediatric patients, certain characteristics have been associated with a favorable outcome.
**Why the Correct Answer is Right**
The good prognosis factors of ALL include:
* Age: Children under 1 year and between 1 and 10 years have a better prognosis.
* White blood cell count: Lower counts at diagnosis are associated with a better outcome.
* Cytogenetic abnormalities: Presence of the ETV6-RUNX1 fusion gene, t(12;21), is a favorable prognostic marker.
* Response to initial therapy: Early achievement of complete remission is a good prognostic indicator.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because certain types of cytogenetic abnormalities, such as MLL gene rearrangements, are associated with a poor prognosis.
**Option B:** Incorrect because elevated white blood cell count at diagnosis is a negative prognostic factor.
**Option C:** Incorrect because age greater than 10 years is associated with a poorer prognosis, and certain types of cytogenetic abnormalities, such as BCR-ABL fusion gene, are also associated with a poor outcome.
**Clinical Pearl / High-Yield Fact**
In pediatric ALL, the ETV6-RUNX1 fusion gene is present in approximately 25% of cases and is associated with a favorable prognosis. This genetic abnormality is often used as a marker to identify patients with a good response to therapy.
**Correct Answer: A. Certain types of cytogenetic abnormalities are associated with a poor prognosis in ALL.**