Recombinant Hemopoietic Growth Factors: Comparative Hemopoietic Response in Younger and Older Subjects

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Abstract
Objective: To study the effectiveness of hemopoietic growth factors in older patients.Design: Literature review. All articles published in English language between 1987 and 1990 were reviewed. Those reporting studies without age limits as entry criteria and describing the effects of growth factors in individual patients were suitable for analysis. Bone marrow transplantation related articles were excluded.Main Outcome Measures: The meanfold increase of granulocytes for Granulocyte‐Colony Stimulating Factor, Granulocyte Macrophage‐Colony Stimulating Factor, and Interleukin 3 and of hemoglobin for erythropoietin were compared in subjects younger and older than 65, by Mann‐Whitney U test.Results: Of 68 studies, 23 were suitable for analysis. These included patients with myelodysplastic syndromes, aplastic anemia, chemotherapy‐induced myelosuppression, chronic granulocytopenia, anemia, and myelosuppression of malignancies and of chronic disease. Of 204 patients, 67 were 65 years of age or older and 42 were over 70. No difference was seen in meanfold increase of granulocyte and hemoglobin in time of response to growth factors or in response in presence of an absolute neutrophil count lower than 1000/μL between younger and older patients.Conclusion: Early response to hemopoietic growth factors appears well maintained with advanced age. Prospective studies of the prolonged effects of these factors in older and younger patients are needed.