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We examined neutrophil functions in seven elderly patients with non-Hodgkin's lymphoma before and during treatment with granulocyte colony-stimulating factor (G-CSF) at the neutropenic stage after combination chemotherapy. Subcutaneous injection of 75 micrograms/d of G-CSF produced by E. coli was started when the neutrophil count decreased less than 1,500/microliter, and continued until the neutrophil count increased to about 10,000/microliter. The phagocytic activity of neutrophils from the elderly on day 3 of G-CSF treatment was markedly enhanced; 1,129.9 +/- 403 ps/100 PMNs, which was 185.7 +/- 31.4% (p &lt; 0.001) as compared with that before G-CSF treatment. The neutrophil alkaline phosphatase (NAP) activity was also enhanced on day 3; 398.3 +/- 48 score, which was 135.2 +/- 5.1% (p &lt; 0.001) as compared with that before G-CSF treatment. Two patients developed interstitial pneumonitis during or shortly after the treatment with G-CSF. Interstitial pneumonitis suddenly developed when their neutrophil count was increased, and the phagocytic activity and NAP activity recovered. The phagocytic activity of neutrophils from them was enhanced to 1,090 +/- 26 ps/100 PMNs and 772 ps/100 PMNs during the treatment with G-CSF, as compared with that before G-CSF treatment of 644 +/- 29 ps/100 PMNs and 465 +/- 69 ps/100 PMNs, respectively. The NAP activity was also enhanced to 372 from 264. One patient suffered from transient pulmonary dysfunction during the treatment with G-CSF. His neutrophil count was more than 13,000/microliter, and the phagocytic activity enhanced to 949 +/- 105 ps/100 PMNs. Dyspnea with suppressed PaO2 recovered reversibly after cessation of G-CSF.(ABSTRACT TRUNCATED AT 250 WORDS)

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Neutrophil Functions during Treatment with Granulocyte Colony-Stimulating Factor(G-CSF) in the Elderly with Non-Hodgkin's Lymphoma: Including Two Patients Accompanied with Interstitial Pneumonitis during the Treatment with G-CSF.