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Infections in hairy cell leukemia (leukemic reticuloendotheliosis)
Abstract:
Of 22 patients with hairy cell leukemia, 18 developed life-threatening infections. Susceptibility to infection appeared to be increased nonspecifically, in that a wide range of infecting organisms were noted. Pseudomonas aeruginosa was the organism isolated most frequently. Four patients had disseminated Mycobacterium kansasii, and one had bacillus Calmette-Guerin lymphadenitis. Two patients developed serious fungal infections (Candida albicans in one and Allescheria boydii in the other). One patient had disseminated cytomegalovirus infection and two had toxoplasmosis. Splenectomy did not appear to decrease the infection rate. The infection rate initially increased following chemotherapy (P less than 0.001), then returned to pretreatment levels by two months following treatment. Infections were most frequent during granulocytopenia (P less than 0.01), but granulocytopenia was not a prerequisite for either life-threatening or fatal infections. Monocytopenia may be a more important factor than granulocytopenia in risk of infection in hairy cell leukemia patients.
Insights
Patients with hairy cell leukemia (HCL) frequently develop severe infections from various pathogens. Monocytopenia, not granulocytopenia, may be a key risk factor for these life-threatening infections in HCL patients.
Area of Science:
- Hematology
- Infectious Diseases
- Oncology
Background:
- Hairy cell leukemia (HCL) is a rare B-cell malignancy.
- Patients with HCL are known to be susceptible to infections, but the specific patterns and risk factors require further elucidation.
Purpose of the Study:
- To investigate the incidence, spectrum, and risk factors of life-threatening infections in patients with hairy cell leukemia.
Main Methods:
- Retrospective analysis of 22 patients diagnosed with HCL.
- Detailed review of infection types, causative organisms, and patient characteristics including hematological parameters and treatment history.
Main Results:
- 18 out of 22 HCL patients developed life-threatening infections.
- A broad range of pathogens were identified, with Pseudomonas aeruginosa being the most common; opportunistic infections including disseminated Mycobacterium kansasii, fungal infections, cytomegalovirus, and toxoplasmosis were observed.
- Infections were most frequent during granulocytopenia but monocytopenia was identified as a potentially more significant risk factor.
Conclusions:
- Hairy cell leukemia patients face a high risk of severe, diverse infections.
- Monocytopenia appears to be a critical factor in predicting infection risk, potentially more so than granulocytopenia.
- Splenectomy and chemotherapy timing influence infection rates, highlighting the need for careful management strategies.