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Advances in pediatric asthma in 2010: Addressing the major issues

Last year’s “Advances in pediatric asthma” concluded with the following statement: “If we can close these [remaining] gaps through better communication, improvements in the health care system and new insights into treatment, we will move closer to better methods to intervene early in the course of the disease and induce clinical remission as quickly as possible in most children.”

This year’s summary will focus on recent advances in pediatric asthma that take steps moving forward as reported in Journal of Allergy and Clinical Immunology publications in 2010. Some of these recent reports show us how to improve asthma management through steps to better understand the natural history of asthma, individualize asthma care, reduce asthma exacerbations, and manage inner-city asthma and some potential new ways to use available medications to improve asthma control. It is clear that we have made many significant gains in managing asthma in children, but we have a ways to go to prevent asthma exacerbations, alter the natural history of the disease, and reduce health disparities in asthma care.

Perhaps new directions in personalized medicine and improved health care access and communication will help maintain steady progress in alleviating the burden of this disease in children, especially young children.

Three years of specific immunotherapy may be sufficient in house dust mite respiratory allergy

Specific immunotherapy (SIT) duration for respiratory allergy is currently based on individual decisions.Objective: To evaluate the differences in clinical efficacy of SIT as a result of the duration between the current recommended limits (3-5 years).

Methods: A 5-year prospective, controlled clinical trial of SIT blind until the first year and randomization to a 3-year (IT3) or 5-year (IT5) course was conducted. Of the 239 patients with respiratory allergy caused by D pteronyssinus initially included, 142 completed 3 years of SIT with good compliance. Twenty-seven controls were included at the third year. Efficacy of SIT after 3 (T3) and 5 (T5) years was assessed by using clinical scores, visual analog scales (VASs), rhinitis (RQLQ) and asthma (AQLQ) quality of life questionnaires, skin tests, and serum immunoglobulins.

Results: At T3, significant reductions were observed in rhinitis (44% in IT3 and 50% in IT5; P < .001), asthma (80.9 % in IT3 and 70.9% in IT5; P < .001) scores, VAS (P < .001 in both), RQLQ (P < .001 in both) and AQLQ (P < .001 in both). At T5, the clinical benefit was maintained in both groups, and IT5 patients presented additional decreases (19%; P = .019) in rhinitis scores. At Tf, specific IgG4 measurements were lower in IT3 (P = .03) without detecting differences in IT5. An increase in asthma score of 133% was the only difference observed in controls.

Conclusion: Clinical improvement is obtained with 3 years of D pteronyssinus SIT. Two additional years of SIT add clinical benefit in rhinitis only.

Mechanisms of allergen-specific immunotherapy

Allergen-specific immunotherapy has been used for 100 years as a desensitizing therapy for allergic diseases and represents the potentially curative and specific method of treatment.

The mechanisms of action of allergen-specific immunotherapy include the very early desensitization effects, modulation of T-and B-cell responses and related antibody isotypes, and migration of eosinophils, basophils, and mast cells to tissues, as well as release of their mediators. Regulatory T (Treg) cells have been identified as key regulators of immunologic processes in peripheral tolerance to allergens. Skewing of allergen-specific effector T cells to a regulatory phenotype appears as a key event in the development of healthy immune response to allergens and successful outcome in patients undergoing allergen-specific immunotherapy. Naturally occurring forkhead box protein 3–positive CD4+CD25+ Treg cells and inducible TR1 cells contribute to the control of allergen-specific immune responses in several major ways, which can be summarized as suppression of dendritic cells that support the generation of effector T cells; suppression of effector TH1, TH2, and TH17 cells; suppression of allergen-specific IgE and induction of IgG4; suppression of mast cells, basophils, and eosinophils; and suppression of effector T-cell migration to tissues.

New strategies for immune intervention will likely include targeting of the molecular mechanisms of allergen tolerance and reciprocal regulation of effector and Treg cell subsets.

The two-incision approach for video-assisted thoracoscopic lobectomy: an initial experience [Original articles]

The video-assisted thoracoscopic approach (video-assisted thoracic surgery (VATS)) to lobectomy for non-small-cell lung cancer (NSCLC) is not standardised. Although three to four incisions are usually made, with the right surgical technique, the operation can be successfully carried out using only two incisions. We have analysed retrospectively, the characteristics and postoperative evolution of patients undergoing VATS lobectomies using two ports.

Methods: From June 2007 to November 2009, we carried out 131 major pulmonary resections by VATS, of which 40 (February 2009 to November 2009) were realised using only two incisions: one 1-cm incision through the 7th/8th intercostal space in the mid-axillary line, and a 3–5-cm anterior utility incision in the 5th intercostal space. The patients’ mean age was 60.8 ± 11.4 years (75% male, 25% female).

Results: The conversion rate was 10% (four patients). Of the remaining 36 cases, the diagnosis in six patients was benign, and in four was metastatic disease. Of the 26 cases with NSCLC, the most frequent stage was that of interactive application (IA) (58%) and histology mostly revealed adenocarcinoma (33%). Mean duration of surgery in the 36 resections completed by VATS was 168.6 ± 54.0 min (range 80–300 min). The median chest tube duration was 2.5 days and the median length of stay in hospital was 3 days. There was no perioperative mortality in completed VATS cases, and no patient needed to be re-operated. Those patients with chronic obstructive pulmonary disease (COPD) needed longer hospital stays (p = 0.046). Similarly, extreme cases of adhesion during surgery needed more days of thoracic drainage (p = 0.040) and longer hospital stays (p = 0.011), as well as displaying a higher percentage of postoperative complications (p = 0.008). If the group of patients is divided in two periods (February to July 2009 and August to November 2009), more extended lymphadenectomies are observed among those performed during the latter period.

Conclusions: VATS lobectomy with two incisions is a safe and reliable procedure producing good postoperative results. As we obtain more experience over time, results improve, especially in the performance of more extended lymphadenectomies.

Long-term survival of 42 patients with resected N2 non-small-cell lung cancer: the impact of 2-18F-fluoro-2-deoxy-D-glucose positron emission tomogram mediastinal staging [Original articles]

Prognostic information known preoperatively allows stratification of patients to surgery; induction therapy and surgery; or definitive chemoradiotherapy and may prevent a futile thoracotomy. Attention has focussed on the standard uptake value (SUV) of the primary tumour but less has been described regarding the 18F-fluoro-2-deoxy-d-glucose (18F-FDG) avidity of mediastinal nodes. We aimed, in a group of surgically resected cN0-1 but pN2 tumours, to compare the survival of patients with and without 18F-FDG avid mediastinal nodes.

Methods: Retrospective review of a surgical database identified cN0-1 non-small-cell lung cancer (NSCLC) patients with pN2 disease after resection. Survival of non-FDG avid N2 versus FDG avid N2 groups was compared after stratification according to variables found on univariate analysis to affect survival.

Results: From January 1993 to December 2006, 42 patients were identified; 27 (64%) had non-FDG avid N2 disease. Five-year and median survival were better in the non-FDG avid N2 disease group, 25% versus 0% and 30 (16–44) versus 13 (10–16) months, respectively (p = 0.02). After 1998, the difference in survival was 41% versus 0% and 35 (14–56) versus 12 (16–18) months, respectively (p = 0.02).

Conclusions: After resection, patients with non-FDG avid N2 disease have better survival than patients with FDG avid N2 disease. Exploratory thoracotomy alone (after frozen section analysis) cannot be advocated in patients with non-FDG avid N2 disease as survival after resection appears at least equivalent to alternate therapeutic approaches in this group. This assertion may be tempered if right pneumonectomy is required or R0 resection is unachievable. Mediastinal nodal avidity may improve stratification in future studies of long-term survival in NSCLC.

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