**Question:** Poor prognostic factor for ALL is

A. High age
B. Severe anemia
C. Severe thrombocytopenia
D. Leukocyte count less than 5,000/mm³

**Core Concept:** Acute Lymphoblastic Leukemia (ALL) is a type of cancer that affects the bone marrow and blood. Prognosis refers to the expected course and outcome of the disease. Multiple factors can help predict the prognosis for patients with ALL.

**Why the Correct Answer is Right:** A high age is considered a poor prognostic factor for ALL because elderly patients often have more comorbidities and a weaker immune system, increasing the risk of complications and treatment failure.

**Why Each Wrong Option is Incorrect:**

B. Severe anemia (hemoglobin < 8g/dL) is a poor prognostic factor in some cases, but severe anemia alone is not the only factor to consider when assessing ALL prognosis. C. Severe thrombocytopenia (platelet count < 20,000/mm³) can worsen the prognosis due to increased risk of bleeding, but it is not as strong a predictor as other factors like age, disease burden, and treatment response. D. A leukocyte count less than 5,000/mm³ is generally not considered a poor prognostic factor in ALL. Instead, the presence of blasts (leukemic cells) is more relevant in assessing the severity of the disease and treatment response. **Clinical Pearl:** In assessing the prognosis of a patient with ALL, it is essential to consider multiple factors, including age, disease burden, response to treatment, and the presence of specific genetic mutations or chromosomal abnormalities. A comprehensive evaluation helps guide treatment decisions and patient management.