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Zorluk: OrtaHematology and Oncology

A 38-year-old man presents to the emergency department with a 3-day history of bleeding gums, frequent epistaxis, and a diffuse rash. He has no significant past medical history. His temperature is 37.6∘C37.6^\circ\text{C} (99.7∘F99.7^\circ\text{F}), blood pressure is 112/70112/70 mm Hg, and pulse is 105105/min. Physical examination reveals widespread petechiae and ecchymoses over his trunk and extremities, as well as active mucosal bleeding in the oral cavity. Laboratory studies show:

Laboratory TestResult
Hemoglobin7.87.8 g/dL
Leukocyte count32,000/μL32,000/\mu\text{L}
Platelet count18,000/μL18,000/\mu\text{L}
Prothrombin time (PT)2222 seconds
Activated partial thromboplastin time (aPTT)4848 seconds
Fibrinogen8585 mg/dL (Normal: 150−400150-400 mg/dL)

A peripheral blood smear demonstrates numerous atypical promyelocytes containing multiple needle-like cytoplasmic inclusions (Auer rods).

Based on the suspected diagnosis, arrange the following management and diagnostic steps in the most appropriate chronological order.

  1. 1Initiate therapy with all-trans retinoic acid (ATRA)
  2. 2Perform a bone marrow aspiration and biopsy
  3. 3Confirm the diagnosis via fluorescence in situ hybridization (FISH) for t(15;17)
  4. 4Administer post-remission consolidation therapy

Cevap

The correct chronological sequence for managing suspected acute promyelocytic leukemia is: 1) Initiate therapy with all-trans retinoic acid (ATRA), 2) Perform a bone marrow aspiration and biopsy, 3) Confirm the diagnosis via fluorescence in situ hybridization (FISH) for t(15;17), and 4) Administer post-remission consolidation therapy.
The correct management sequence for acute promyelocytic leukemia prioritizes immediate life-saving therapy over definitive diagnostic confirmation. ATRA is initiated first based on peripheral blood smear findings to reverse DIC. A bone marrow biopsy is then performed to formally diagnose the leukemia and obtain a sample for FISH. FISH is subsequently performed on this sample to identify the t(15;17) translocation. Finally, consolidation therapy is administered weeks later, once the patient has achieved complete remission.

Adım Adım Çözüm

1
Recognize the clinical presentation and laboratory findings suggestive of Acute Promyelocytic Leukemia (APL).
The patient has pancytopenia, coagulopathy consistent with disseminated intravascular coagulation (DIC), and a peripheral smear showing promyelocytes with Auer rods.
Identifying APL is crucial because it is a hematologic emergency that dictates immediate, specific intervention to prevent fatal hemorrhage.
2
Determine the most critical initial intervention before pursuing definitive diagnostic testing.
Initiate all-trans retinoic acid (ATRA) therapy.
ATRA induces differentiation of the leukemic cells and rapidly resolves the DIC, significantly reducing early mortality. It must not be delayed for bone marrow biopsy or molecular confirmation.
3
Establish the sequence for definitive diagnostic confirmation.
Perform a bone marrow aspiration and biopsy, followed by molecular testing (FISH) for the t(15;17) translocation.
A bone marrow sample is required to confirm the diagnosis morphologically and provide the specimen for FISH, which definitively identifies the PML-RARA fusion gene.
4
Identify the long-term management step after initial stabilization and remission induction.
Administer post-remission consolidation therapy.
Consolidation therapy is given after the patient achieves remission to eradicate minimal residual disease and prevent relapse.

Anahtar Kavram

In patients with suspected acute promyelocytic leukemia (APL), all-trans retinoic acid (ATRA) must be administered immediately based on clinical and morphological suspicion to treat life-threatening coagulopathy, prior to definitive confirmation with bone marrow biopsy and genetic testing.
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Hematology and Oncology

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