IL-33 Expression Is Lower in Current Smokers at both Transcriptomic and Protein Levels.

Rationale: IL-33 is a proinflammatory cytokine thought to play a role in the pathogenesis of asthma and chronic obstructive pulmonary disease (COPD). A recent clinical trial using an anti-IL-33 antibody showed a reduction in exacerbation and improved lung function in ex-smokers but not current smokers with COPD. Objectives: This study aimed to understand the effects of smoking status on IL-33. Methods: We investigated the association of smoking status with the level of gene expression of IL-33 in the airways in eight independent transcriptomic studies of lung airways. Additionally, we performed Western blot analysis and immunohistochemistry for IL-33 in lung tissue to assess protein levels. Measurements and Main Results: Across the bulk RNA-sequencing datasets, IL-33 gene expression and its signaling pathway were significantly lower in current versus former or never-smokers and increased upon smoking cessation (P < 0.05). Single-cell sequencing showed that IL-33 is predominantly expressed in resting basal epithelial cells and decreases during the differentiation process triggered by smoke exposure. We also found a higher transitioning of this cellular subpopulation into a more differentiated cell type during chronic smoking, potentially driving the reduction of IL-33. Protein analysis demonstrated lower IL-33 levels in lung tissue from current versus former smokers with COPD and a lower proportion of IL-33-positive basal cells in current versus ex-smoking controls. Conclusions: We provide strong evidence that cigarette smoke leads to an overall reduction in IL-33 expression in transcriptomic and protein level, and this may be due to the decrease in resting basal cells. Together, these findings may explain the clinical observation that a recent antibody-based anti-IL-33 treatment is more effective in former than current smokers with COPD.

Point mutations of the BCL-6 gene: clinical and prognostic correlation in B-diffuse large cell lymphoma.

Although point mutations of the 5' noncoding regions of the BCL-6 proto-oncogene are frequently detected in B-diffuse large cell lymphoma (B-DLCL), a thorough analysis of the clinical correlation of these mutations has not been performed to date. In this study, BCL-6 mutations were examined by DNA direct sequencing in 103 patients with B-DLCL. BCL-6 mutations were found in 53/103 patients, including 38/76 treated with standard chemotherapy and 15/27 treated with autologous stem cell transplantation (ASCT) up front. The presence of BCL-6 mutations was correlated with clinical features at diagnosis and outcome. Mutated patients had a significantly higher LDH level (66% vs 38%, P < 0.05), and bulky disease (51% vs 32%, P = 0.05). In the whole series of patients BCL-6 mutations did not affect CR and OS. Patients with BCL-6 mutations tended to have a prolonged 5-years DFS and FFS compared to those without mutations (DFS 82% vs 63%, FFS 63% vs 49%). Among B-DLCL treated with standard chemotherapy, mutated patients showed a significantly improved 5-year DFS (85% vs 61%, P < 0.05) and, notably, the only four relapses observed among mutated patients occurred in less than 8 months. The multivariate regression analysis (P < 0.01) with DFS as endpoint confirmed the independent prognostic value of BCL-6 mutations. There was a trend for 5-year failure-free survival to be better for patients with BCL-6 mutations (63% vs 43%, P = 0.09). In the 27 patients treated with ASCT, BCL-6 mutations did not correlate with outcome. These results suggest that BCL-6 mutations may predict a higher chance of being free of disease in B-DLCL treated with standard chemotherapy. Larger series of patients need to be analyzed to evaluate the clinical relevance of BCL-6 mutations properly.

Human immunodeficiency virus-related non-Hodgkin lymphoma: activity of infusional cyclophosphamide, doxorubicin, and etoposide as second-line chemotherapy in 40 patients.

BACKGROUND: The prognosis of patients with human immunodeficiency virus (HIV)-related non-Hodgkin lymphoma (NHL) is poor. In fact, despite a high complete response (CR) rate, approximately 50% of these patients die from progressive lymphoma. METHODS: From November 1994 to April 2000, the authors treated 40 patients with resistant or recurrent HIV-related NHL with a 96-hour continuous intravenous infusion of cyclophosphamide (187.5 mg/m(2) per day), doxorubicin (12.5 mg/m(2) per day), and etoposide (60 mg/m(2) per day). RESULTS: The median number of cycles administered was two (range, one to six cycles). A CR was documented in 4 of 40 patients (10%), and a partial remission (PR) was documented in 7 of 40 patients (18%). The CR median duration was 6 months (range, 4--30+ months), whereas PRs lasted for 5 months (range, 2--8 months). The overall median survival was 4 months (range, < 1--33 months), and the median survival for responding patients was 10 months. CONCLUSIONS: The current data confirm that infusional cyclophosphamide, doxorubicin, and etoposide is active in patients with refractory or recurrent HIV-related NHL. However, the median survival of these patients remains poor, and the other innovative approaches should be used.

Intensified CHOP regimen in aggressive lymphomas: maximal dose intensity and dose density of doxorubicin and cyclophosphamide.

BACKGROUND: Following our previous study of CHOP (cyclophosphamide, doxorubicin, vincristine and prednisone) intensification in non-Hodgkin's lymphoma (NHL), in the present report we attempted to further increase dose intensity by shortening the between-course intervals with the support of growth factors. PATIENTS AND METHODS: A total of 67 patients were enrolled. With a fixed dose of doxorubicin 75 mg/m(2), cyclophosphamide (CTX) was started at a dose of 1750 mg/m(2) and increased by 250 mg/m(2) in consecutive cohorts of patients provided that no dose-limiting toxicity occurred. After the maximal tolerated dose (MTD) had been identified, this was used to treat more patients in order to confirm the feasibility of the regimen on a large scale, with the number of cycles being varied on the basis of disease extension. RESULTS: Twenty-three cases were enrolled in the CTX dose finding phase. Dose-limiting non-hematological toxicity occurred at 2250 mg/m(2). As the intermediate level of 2000 mg/m(2) had a borderline toxicity profile, a CTX dose of 1750 mg/m(2) was defined as the MTD. A total of 53 patients then received the MTD during the course of the study as a whole. At the MTD, toxicity was acceptable. Only 10 of 189 cycles (4%) required hospitalization due to infection or febrile neutropenia. Seventy-four percent of the patients achieved complete remission. Freedom from progression and overall survival at 12 months were 71% and 86% in the whole series, and 58% and 71% for high-risk cases, respectively. CONCLUSIONS: This intensified CHOP regimen is feasible on an outpatient basis. It can be safely considered a definitive treatment in patients at low and intermediate risk, and as induction before high-dose consolidation in high-risk cases.