A 55-year-old male presents with fatigue, weight loss, and pruritus. Laboratory studies reveal leukocytosis, elevated basophils with immature forms on a peripheral smear, >20% basophilic blasts in the bone marrow, and elevated serum histamine levels. What best explains the relationship between hyperhistaminemia and the patient’s condition?

A bone marrow sample is sent to the lab for cytochemical staining. Results as follows: Myeloperoxidase: positive                    Sudan Black B: positive                           Non-specific Esterase: positiveBased on these findings, what lineage(s) is (are) most likely present?

Which of the following patient populations is most commonly afflicted with ALL?

A 35-year-old female presents with fatigue, bleeding gums, and bruising. Laboratory tests reveal: Hemoglobin: 8.5 g/dL (low) Platelets: 25,000/µL (low) WBC: 3,500/µL (low) Peripheral smear: Numerous abnormal promyelocytes with Auer rods. What life-threatening complication is this patient most at risk of developing?

An immunoglobulin (Ig) gene rearrangement can be identified in all of the following acute lymphoblastic leukemias except:

A panel of cytochemical stains is performed to determine a patient’s subtype of AML. Myeloperoxidase and Sudan Black B are positive. Specific esterase is positive and nonspecific esterase is negative. Based on this information, what lineage is implicated as the chosen subtype of AML?

The presence of partial chimerism after a bone marrow transplant indicates:

A 7-year-old child is diagnosed with B-cell Acute Lymphoblastic Leukemia (B-ALL). Cytogenetic analysis reveals the presence of hyperdiploidy. Which of the following best describes the significance of these findings?

Identify the complement activation pathway that is triggered by the binding of an antibody to a pathogen.

On July 1, Acme Company pays the annual premium for an insurance policy that covers the 12-month period that begins on July 1. Acme’s accountant makes the proper journal entry on July 1 to record the cash payment to the insurance company and also makes the proper adjusting journal entry on December 31 with respect to this prepaid expense. What is the effect of the December 31 adjusting journal entry on Acme’s current ratio and acid-test ratio?