Recurrence of primary spontaneous pneumothorax: Associated factors.

INTRODUCTION: Determining the risk of recurrence of primary spontaneous pneumothorax is challenging. The objective of this study was to develop a risk assessment model to predict the probability of recurrence in patients with spontaneous pneumothorax. METHODS: A retrospective study was performed of all episodes of pneumothorax diagnosed in the last 12 years in a hospital, in patients not initially submitted to surgery. Logistic regression was used to estimate the probability of recurrence. Based on a set of variables, a predictive model was built with its corresponding ROC curve to determine its discrimination power and diagnostic precision. RESULTS: Of the 253 patients included, 128 (50.6%) experienced recurrence (37% within the first year). Recurrence was detected within 110 days in 25% of patients. The median of time to recurrence for the whole population was 1120 days. The presence of blebs/bullae was found to be a risk factor of recurrence (OR: 5.34; 95% CI: 2.81-10.23; p=0.000), whereas chest drainage exerted protective effect (OR: 0.19; 95% CI: 0.08-0.40; p=0.000). The variables included in the regression model constructed were hemoglobin and leukocyte count in blood, treatment received, and presence of blebs/bullae, with a fair discriminative power to predict recurrence [AUC=0.778 (95% CI: 0.721-0.835)]. CONCLUSION: The overall recurrence rate was high and was associated with the presence of blebs/bullae, failure to perform an active intervention (chest drainage) and low levels of hemoglobin and leukocytes in blood. Recurrence rarely occurs later than three years after the first episode. Once validated, this precision model could be useful to guide therapeutic decisions.

Interference of Dermatophagoides pteronyssinus sensitization in grass pollen allergy.

Summary: Background. Climate conditions in the northwest of Spain are from the rest of the country, and the pollen sensitisation rates and allergens involved are different. The present study aimed to investigate the sensitisation profile of patients with grass pollen allergy and the interference of other sensitisations in respiratory symptoms. Methods. A total of 959 Spanish patients with seasonal respiratory symptoms and a positive skin prick test (SPT) to Phleum pratense pollen were studied. Patients were classified as having rhinitis and/or bronchial asthma. A battery of SPTs, including common weeds and tree pollens, profilin, polcalcin, moulds, Dermatophagoides pteronyssinus, Lepidoglyphus destructor, and cat and dog dander were performed. Serum specific IgE (sIgE) to Phl p 1 and Phl p 5, adding sIgE to Phl p 7, Phl p 12 and house dust mites (HDMs) or other pollens in selected cases were measured. Results.The majority (89.8%) of the patients were polysensitised according to SPT. HDM co-sensitisation was the most prevalent (62.3%). Profilin and polcalcin rendered a positive result in 25.9% and 18.7% of the patients, respectively. A higher proportion of patients recognized sIgE to Phl p 1 (88.7%) with respect to Phl p 5 (59%). Phl p 1-sIgE levels were higher than Phl p 5-sIgE levels, and no differences were found in patients with rhinitis and/or asthma. However, total serum IgE was higher in patients with asthma. Multivariate regression analyses revealed that only sIgE to Dermatophagoides pteronyssinus (after adjusting by sIgE to Phl p 1, Phl p 5 and Lepidoglyphus destructor) was associated with a greater risk of asthma. Conclusions. Phl p 1 is the most relevant allergen in patients with grass pollen allergy in the northwest of Spain. Sensitisation rates against panallergens are low. Even in patients with grass pollen allergy, HDM sensitisation plays a relevant role in asthma.

Serum Concentrations of Interleukin 6 in the General Adult Population: Possible Implications for Anti-IL-6 Therapy in SARS-Cov-2 Infection and IL-6-Related Diseases

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Assessing the relationship between markers of glycemic control through flexible copula regression models.

Glycated haemoglobin (HbA1c) is a sensitive marker of blood glucose in patients with diabetes. However, levels can vary considerably, even amongst individuals with similar mean blood glucose concentrations. Other glycated proteins, such as fructosamine, can also act as blood sugar markers, but estimating HbA1c and fructosamine via independent models may lead to errors of interpretation regarding disease severity. From a clinical standpoint, it would be of great interest to know the factors that affect the mean concentration of both HbA1c and fructosamine, which influence the variability in the concentrations of these glycated markers and cause HbA1c/fructosamine discordance. Flexible models are required to illustrate the behaviour of these variables as well as the association between them. This work reviews existing models that might serve in this regard. Flexible copula regression models using splines were used to provide a better understanding of the behaviour of both glycated proteins and the relationship between them under the possible influence of different covariates. This work shows the usefulness of this type of models in practise and provides a basis for their clinical interpretation by means of an understandable case study. Ultimately, to better understand the effects of each continuous covariate, they are represented at the true scale of the response variables.

Factors Influencing Serum Concentrations of Immunoglobulin D in the Adult Population: An Observational Study in Spain.

Immunoglobulin D (IgD) is the least studied of immunoglobulin classes. This study sought to investigate the potential relationship between demographic, metabolic, lifestyle and immunological factors, and serum IgD concentrations in a general adult population. We measured serum IgD concentrations by means of a commercial turbidimetric assay in 413 individuals (median age, 55 years; 45% males), randomly selected from the adult population of a Spanish municipality. Serum IgD concentrations displayed considerable variation in the population, ranging from undetectable (<6.7 mg/l) to 878 mg/l. Serum IgD concentrations were undetectable in 78 cases (18.9%) and >100 mg/l in 39 cases (9.4%). Median IgD was 21.9 mg/l. Serum IgD concentrations were negatively associated with age and positively associated with smoking, after adjustment for potential confounders. Overweight individuals showed lower concentrations of IgD than did normal-weight individuals. Atopy (positivity of skin tests to aeroallergens) was not significantly associated with IgD concentrations, although non-symptomatic atopics showed higher IgD concentrations. No consistent association was observed between serum IgD concentrations and gender, metabolic syndrome, or alcohol consumption. No significant association was found between baseline IgD concentrations and development of either allergic or immune disease after a median 11.4 years of follow-up. In conclusion, serum IgD concentrations in adults show a wide variation in the population and may be influenced by common factors, particularly age and smoking habit. These factors should be taken into account when defining reference ranges for serum IgD concentrations.

Efectos del tratamiento con presión positiva continua en la vía aérea sobre las funciones cognitivas en pacientes con apnea del sueño grave / Effects of continuous positive airway pressure treatment on cognitive functions in patients with severe obstructive sleep apnoea

Introducción: El síndrome de apnea-hipopnea del sueño (SAHS) tiene numerosas repercusiones sobre la salud y puede afectar a las funciones neurocognitivas de los pacientes. Objetivo: Investigar las funciones neuropsicológicas que resultan más afectadas por el SAHS, los factores asociados a la gravedad del SAHS relacionados con tales limitaciones y el efecto de la terapia con presión positiva continua en la vía aérea. Pacientes y método: La muestra estuvo compuesta por 60 participantes: 30 pacientes con diagnóstico de SAHS (grupo clínico) y 30 personas sin él (grupo control). La memoria, los procesos intelectuales y la atención fueron analizados por los subtests de la batería neuropsicológica de Luria-DNA (subtest de memoria inmediata, memoria lógica, dibujos temáticos y textos, actividad conceptual y discursiva y control atencional). Resultados: Los pacientes mostraron puntuaciones significativamente inferiores a los controles en la mayoría de las áreas evaluadas. Se encontraron asociaciones de la calidad de sueño subjetiva con la actividad conceptual (r = -0,279; p < 0,05) y con el control atencional (r = -0,392; p < 0,01); de la saturación media de oxígeno con la memoria inmediata (r = 0,296; p < 0,05) y con los dibujos temáticos (r = 0,318; p < 0,05); del índice de apnea-hipopnea con la memoria inmediata (r = -0,303; p < 0,05), con la memoria lógica (r = -0,359; p < 0,01) y con los dibujos temáticos (r = -0,302; p < 0,05) de la muestra total. La presión positiva continua en la vía aérea resultó eficaz solamente en la mejora de la memoria inmediata (p = 0,03) de los pacientes con SAHS. Conclusiones: Los pacientes con SAHS grave mostraron alteraciones atencionales y mnésicas relacionadas con un empeoramiento de la calidad del sueño, con unos peores índices de apnea-hipopnea y saturación media de oxígeno. El tratamiento con presión positiva continua en la vía aérea mejoró el rendimiento en la memoria de los pacientes

Introduction: Obstructive sleep apnoea syndrome (OSAS) has numerous implications for health and can affect neurocognitive functions in patients. Objective: To evaluate the neuropsychological functions most affected by OSAS, the factors associated with OSAS severity that are related to those functional limitations, and the effect of therapy with continuous positive airway pressure. Patients and method; The sample consisted of 60 participants: 30 patients diagnosed with OSAS (clinical group) and 30 people without the disorder (control group). Memory, intellectual processes, and attention were analysed with selected subtests from the Luria-Nebraska neuropsychological battery (immediate memory, logical memory, intellectual processes, and attentional control subtests). Results: Patients obtained significantly lower scores than controls in most of the areas evaluated. Associations were identified between subjective sleep quality and conceptual activity (r = -0.279; P < .05) and attentional control (r = -0.392; P < .01); between oxygen saturation and both immediate memory (r = 0.296; P < .05) and thematic drawings (r = 0.318; P < .05); and between apnoea-hypopnoea index and immediate memory (r = -0.303; P < .05), logical memory (r = -0.359; P < .01), and thematic drawings (r = -0.302; P < .05). Continuous positive airway pressure was shown to be effective (P = .03) only for improving immediate memory in patients with OSAS. Conclusions: Patients with severe OSAS showed memory and attentional limitations, associated with poorer quality of sleep and with worst AHI and SaO2 mean. The CPAP use improved memory of the patients evaluated

Effects of continuous positive airway pressure treatment on cognitive functions in patients with severe obstructive sleep apnoea. / Efectos del tratamiento con presión positiva continua en la vía aérea sobre las funciones cognitivas en pacientes con apnea del sueño grave.

INTRODUCTION: Obstructive sleep apnoea syndrome (OSAS) has numerous implications for health and can affect neurocognitive functions in patients. OBJECTIVE: To evaluate the neuropsychological functions most affected by OSAS, the factors associated with OSAS severity that are related to those functional limitations, and the effect of therapy with continuous positive airway pressure. PATIENTS AND METHOD: The sample consisted of 60 participants: 30 patients diagnosed with OSAS (clinical group) and 30 people without the disorder (control group). Memory, intellectual processes, and attention were analysed with selected subtests from the Luria-Nebraska neuropsychological battery (immediate memory, logical memory, intellectual processes, and attentional control subtests). RESULTS: Patients obtained significantly lower scores than controls in most of the areas evaluated. Associations were identified between subjective sleep quality and conceptual activity (r=-0.279; P<.05) and attentional control (r=-0.392; P<.01); between oxygen saturation and both immediate memory (r=0.296; P<.05) and thematic drawings (r=0.318; P<.05); and between apnoea-hypopnoea index and immediate memory (r=-0.303; P<.05), logical memory (r=-0.359; P<.01), and thematic drawings (r=-0.302; P<.05). Continuous positive airway pressure was shown to be effective (P=.03) only for improving immediate memory in patients with OSAS. CONCLUSIONS: Patients with severe OSAS showed memory and attentional limitations, associated with poorer quality of sleep and with worst AHI and SaO2 mean. The CPAP use improved memory of the patients evaluated.

Evaluación del daño tisular producido por la nefrolitotomía percutánea mediante la determinación sérica de mediadores inflamatorios / Assessment of tissue damage due to percutaneous nephrolithotomy using serum concentrations of inflammatory mediators

Objetivo: Determinar los efectos producidos por la nefrolitotomía percutánea (NLP) sobre los tejidos mediante la cuantificación de mediadores de respuesta inflamatoria, así como la influencia del desarrollo de complicaciones postoperatorias en el daño tisular. Pacientes y métodos: Estudio observacional, prospectivo, no aleatorizado en 40 pacientes intervenidos mediante NLP. Como grupo control se empleó una cohorte de 50 pacientes con litiasis renal tratada con litotricia extracorpórea por ondas de choque. Determinación previa al tratamiento (T0) y a las 2, 6 y 24 h (T1, T2 y T3) de interleuquina-1beta (IL-1β), factor de necrosis tumoral-alfa (TNF-α), interleuquina-6 (IL-6) y proteína C-reactiva (PCR). Resultados: No se observaron cambios en los niveles de IL-1β y TNF-α. IL-6 presentó un pico sérico entre las 2 y 6 h de la NLP (mediana de 17,8 y 15,8 pg/ml, respectivamente), mientras que el valor pico de PCR fue de 3,4 mg/l a las 24 h. En el grupo tratado con litotricia expracorpórea por ondas de choque no se apreciaron variaciones significativas en ninguno de los marcadores. La concentración sérica de IL-6 y PCR a las 24 horas post-NLP es diferente en función de la aparición de complicaciones (p = 0,001 y p = 0,039, respectivamente). IL-6 presentó una buena capacidad predictiva para el desarrollo de complicaciones (AUC de 0,801). Conclusiones: El daño tisular producido por la NLP es de baja intensidad. Este daño aumenta significativamente en aquellos casos que desarrollan complicaciones en el postoperatorio. La determinación de IL-6 a las 24 h post-NLP parece ser un buen marcador predictivo para el desarrollo de complicaciones (AU)

Objectives: To determine the percutaneous nephrolithotomy (PCNL) effects on the tissues using the quantification of inflammatory mediators, and to assess their impact on the development of postoperative complications. Patients and methods: Prospective observational non-randomized study on 40 patients underwent to PCNL. 50 patients with kidney stone who were treated by extracorporeal shock wave lithotripsy (ESWL) were used as control group. Interleukin-1beta (IL-1β), tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6) and C-reactive protein (CRP) were determined at baseline (T0: before treatment), and at 2, 6 and 24 hours after (T1, T2 and T3). Results: No relevant changes on IL-1β and TNF-α were found. IL-6 showed two peaks at 2 and 6hours post-PCNL (median 17.8 and 15.8 pg/mL, respectively). At 24hours CRP had reached its peak value (3.4mg/L). The group treated with ESWL no showed significant changes in any of the markers. The serum concentration of IL-6 and CRP at 24 hours post-NLP is different depending on the occurrence of complications (P = .001 and P = .039, respectively). IL-6 showed a good predictive power for the development of complications (AUC .801). Conclusions: Tissue damage caused by the PCNL is low. This damage increases significantly in those cases showing postoperative complications. IL-6 at 24 hours has been shown to be a good predictive tool for the development of complications

Assessment of tissue damage due to percutaneous nephrolithotomy using serum concentrations of inflammatory mediators.

OBJECTIVES: To determine the percutaneous nephrolithotomy (PCNL) effects on the tissues using the quantification of inflammatory mediators, and to assess their impact on the development of postoperative complications. PATIENTS AND METHODS: Prospective observational non-randomized study on 40 patients underwent to PCNL. 50 patients with kidney stone who were treated by extracorporeal shock wave lithotripsy (ESWL) were used as control group. Interleukin-1beta (IL-1ß), tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6) and C-reactive protein (CRP) were determined at baseline (T0: before treatment), and at 2, 6 and 24hours after (T1, T2 and T3). RESULTS: No relevant changes on IL-1ß and TNF-α were found. IL-6 showed two peaks at 2 and 6hours post-PCNL (median 17.8 and 15.8 pg/mL, respectively). At 24hours CRP had reached its peak value (3.4mg/L). The group treated with ESWL no showed significant changes in any of the markers. The serum concentration of IL-6 and CRP at 24hours post-NLP is different depending on the occurrence of complications (P=.001 and P=.039, respectively). IL-6 showed a good predictive power for the development of complications (AUC .801). CONCLUSIONS: Tissue damage caused by the PCNL is low. This damage increases significantly in those cases showing postoperative complications. IL-6 at 24hours has been shown to be a good predictive tool for the development of complications.

IgE antibodies to alpha-gal in the general adult population: relationship with tick bites, atopy, and cat ownership.

BACKGROUND: The carbohydrate alpha-gal epitope is present in many animal proteins, including those of red meat and animal immunoglobulins, such as cat IgA. Systemic anaphylaxis to the alpha-gal epitope has recently been described. OBJECTIVE: To investigate and compare the prevalence of alpha-gal-specific (s)IgE and its associated factors in the general adult population from two separated (Northern and Southern) European regions (Denmark and Spain, respectively). METHODS: Cross-sectional study of 2297 and 444 randomly selected adults from 11 municipalities in Denmark and one in Spain. Alpha-gal sIgE was assessed by ImmunoCAP to bovine thyroglobulin. Additional assessments included a panel of skin prick test (SPT) to common aeroallergens and epidemiological factors, including the history of tick bites in the Danish series. RESULTS: The prevalence of positive (≥ 0.1 kUA /L) sIgE to alpha-gal was 5.5% and 8.1% in the Danish and Spanish series, respectively. The prevalence of sIgE ≥ 0.35 kUA /L was 1.8% and 2.2% in Denmark and Spain, respectively. Alpha-gal sIgE positivity was associated with pet ownership in both series and, particularly, cat ownership (data available in the Danish series). Alpha-gal sIgE positivity was associated with atopy (SPT positivity) in both series, although it was not associated with SPT positivity to cat or dog dander. Alpha-gal sIgE positivity was strongly associated with a history of tick bites. CONCLUSIONS AND CLINICAL RELEVANCE: The prevalence of alpha-gal sIgE antibodies in these general adult European populations is similarly low. The presence of alpha-gal sIgE antibodies is associated with a history of tick bites, atopy, and cat ownership.

Influence of experimental alcohol administration on serum immunoglobulin levels: contrasting effects on IgE and other immunoglobulin classes.

In humans, alcoholic liver disease is associated with hypergammaglobulinemia, particularly with high serum concentrations of IgA. Furthermore, alcohol consumption is associated with high concentrations of IgE and low concentrations of IgG. However, there is little experimental evidence to corroborate these observational findings. The objective of the present study was to investigate the potential short-term effects of alcohol administration on serum immunoglobulin concentrations in mice, and the potential influence of sex and strain on these effects. Eight mouse groups were defined by strain (Swiss vs C57BL/6), sex (male vs female), and experimental procedure (alcohol administration vs control diet). Alcohol was administered in a semi-liquid diet (6.5%v/v); control animals received an isocaloric semi-liquid diet. Immunoglobulin concentrations (IgE, IgA, IgM, IgG1, IgG2a, IgG2b, and IgG3) were measured at baseline and weekly thereafter for 4 weeks. Serum Th1 (interferon-gamma) and Th2 (IL-4 and IL-13) cytokines were measured at week 4. We found significant variations in baseline immunoglobulin concentrations depending upon mouse sex and strain. Alcohol administration was quickly followed by an increase in serum IgE concentrations in all experimental groups. IgE increase was correlated with serum IL-13 increase. In contrast, alcohol administration was not associated with significant changes in serum IgA and IgM concentration, and appeared to decrease IgG subclass concentrations. Alcohol effects on immunoglobulin concentrations were independent of mouse strain and sex. In conclusion, alcohol administration in mice had contrasting effects on IgE and other immunoglobulin classes. This experimental evidence confirms observational results in humans.

Exploring the obesity-asthma link: do all types of adiposity increase the risk of asthma?

BACKGROUND: Obesity and risk of asthma are linked. Different distributions of adiposity, such as visceral, subcutaneous or ectopic adiposity, may affect asthma risk differently. OBJECTIVE: To explore the association of different adiposity types with self-reported asthma, bronchial inflammation and lung function, accounting for possible effect modifiers, such as atopy and gender. METHODS: In a general population sample of 3471 persons aged 19-72, visceral adipose tissue (VAT) and subcutaneous adipose tissue (SAT) were measured by ultrasound, and fat percentage by bio-impedance. Body mass index, waist circumference, waist-to-hip ratio (WHR), bronchial inflammation as fractional expiratory nitric oxide (FeNO), lung function [FEV(1) and forced vital capacity (FVC)], and atopy (specific IgE) were measured. RESULTS: All adiposity measures were associated with a higher risk of asthma. The risk estimates (odds ratios, OR, with 95% confidence interval, CI) of current asthma were of similar magnitude for all six adiposity measures ranging between 1.17, CI = 0.98-1.40 (SAT) and 1.51, CI = 1.17-1.95 (WHR). The adiposity-asthma associations were significantly stronger in non-atopics than in atopics. In non-atopics the risk estimates of current asthma ranged between 1.35 CI = 1.08-1.72 and 1.82 CI = 1.34-2.46 for SAT and WHR respectively. Consistent results were obtained using dichothomized adiposity measures (obese vs. non-obsese). The FVC and FEV(1) decreased significantly with increasing adiposity in both atopics and non-atopics, e.g. FVC decreased between 36 mL (CI = 10, 62 mL) and 155 mL (CI = 124, 186 mL) for one unit (standard error) increase of SAT and VAT respectively. Adiposity measures were not associated with atopy and not consistently associated with FeNO levels. CONCLUSIONS AND CLINICAL RELEVANCE: The effect of adiposity on asthma was mainly seen in non-atopics and did not appear to depend on the distribution of adiposity as reflected by the adiposity measures used in the present study. Increasing adiposity was associated with lower lung function independent of atopic status.

Prevalence of pinguecula and pterygium in a general population in Spain.

PURPOSE: To determine the prevalence of pinguecula and pterygium and to investigate their associations in a general adult population in North-Western Spain. METHODS: An age-stratified random sample of 1155 subjects ≥ 40 years was selected in O Salnés (Spain). From 937 eligible subjects, 619 (66.1%) participated (mean age (SD): 63.4 (14.5) years, range: 40-96 years, 37.0% males). An interview to collect history of systemic diseases and lifestyle details and a comprehensive ophthalmic evaluation in which pinguecula and pterygium were recorded was carried out. The prevalence of pinguecula and pterygium and their relationship with lifestyle factors and ocular and systemic diseases was investigated. RESULTS: The prevalence of pinguecula was 47.9% (95% confidence interval (CI): 43.9-51.9). This prevalence increased significantly with aging (P = 0.002) and was higher in men (56.4%; 95% CI: 50.0-62.7) than in women (42.7%; 95% CI: 37.8-47.8) (P=0.001). The prevalence of pterygium was 5.9% (95% CI: 4.3-7.9). This prevalence also increased significantly with aging (P = 0.005) and was 4.8% (95% CI: 2.6-8.4) in men and 6.5% (95% CI: 4.5-9.3) in women (P = 0.346). After controlling for age and sex, pinguecula was associated with alcohol intake (adjusted odds ratio (OR(a)): 3.08; 95% CI: 1.60-5.95), pterygium with fluorescein staining (OR(a): 2.64; 95% CI: 1.08-6.46) and both disorders with outer activity (OR(a): 2.07; 95% CI: 1.36-3.15 and 2.28; 95% CI: 1.04-4.98, respectively). CONCLUSIONS: Pinguecula is far more common than pterygium. Alcohol consumption is strongly associated with pinguecula. Fluorescein staining is highly prevalent in subjects with pterygium. Both disorders increase with age and are associated with outer activity.

[The immunohistochemical expression of cyclin B1 is associated with higher SUV in 18F-FDG-PET in non-small cell lung cancer patients. Initial results]. / La expresión inmunohistoquímica de ciclina B1 conlleva mayores valores de SUV en la 18F-FDG-PET de pacientes con carcinomas no microcíticos de pulmón. Primeros resultados.

AIM: to study the expression of cyclin B1 and its possible relationship with the maximum SUV in FDG-PET and MIB1 expression in patients with NSCLC. MATERIALS AND METHODS: 49 patients (15 adenocarcinomas, 27 squamous cell carcinomas and 7 bronchoalveolar carcinomas) were included in this study; the immunohistochemical expression of cyclin B1 was determined using the tissue-array technique. Each PET was performed 60 minutes after the i.v. administration of 350-518 MBq of FDG on an Advance system (GE) in 2D acquisition mode. RESULTS: cyclin B1 expression was detected in 40 out of 45 cases. The SUV values were higher (p=0.04) in the cyclin B1+ cases than in the negative cases (16.4+/-8.1 vs 10.9+/-6.2). Cyclin B1 expression and SUV values were not correlated with the clinical stage. The expression of cyclin B1+ correlated positively (p<0.0001) with that of MIB1. After univariate analysis, only the cellular proliferation was a prognostic factor (p=0.037). CONCLUSIONS: our results suggest that there is a direct correlation between cyclin B1 expression and max-SUV values in the PET of NSCLC patients. When the association of cyclin B1 with positive MIB1 is also considered, our results support the role of cell proliferation in FDG uptake by the tumour.

La expresión inmunohistoquímica de ciclina B1 conlleva mayores valores de SUV en la 18F-FDG-PET de pacientes con carcinomas no microcíticos de pulmón. Primeros resultados / The immunohistochemical expression of cyclin B1 is associated with higher SUV in 18F-FDG-PET in non-sma ll cell lung cancer patients. Initial results

Objetivo: estudiar la posible correlación entre la expresión de ciclina B1, proliferación celular y la SUV máxima-18F-FDG-PET en pacientes con carcinomas no microcíticos pulmonares. Material y metodo: se incluyó a 49 pacientes (15 adenocarcinomas, 27 carcinomas escamosos y 7 carcinomas broncoalveolares) y se realizó la expresión inmunohistoquímica de ciclina B1 mediante tissue-arrays. Asimismo, analizamos la proliferación celular (MIB-1). El PET se realizó 60 min después de la administración intravenosa (i.v.) de 350-518 MBq de 18F-FDG en un PET (Advance, GE) y adquisión en 2D. Resultados: la expresión inmunohistoquímica de ciclina B1 se detectó en 40 (81,6%) casos y no se relacionó con el estadio clínico (I-II: 17/21 frente a III-IV: 23/28). Los valores de SUV fueron mayores (p = 0,04) en los casos positivos (16,4 ± 8,1) que en los negativos (10,9 ± 6,2) y no difirieron en función del estadio clínico. La expresión de ciclina B1 se correlacionó (p < 0,0001) con la de MIB1. Tras análisis univariable, la ciclina B1 y los valores SUV no fueron factores pronósticos, pero sí la proliferación celular (p = 0,037). Conclusiones: nuestros resultados muestran una relación directa entre la expresión de ciclina B1 y los valores max SUV en el PET de pacientes afectos de carcinomas no microcíticos de pulmón, lo cual, unido a la asociación de aquella con la positividad del MIB1, apoya el papel de la proliferación celular en la captación del radiofármaco por el tumor(AU)

Aim: to study the expression of cyclin B1 and its possible relationship with the maximum SUV in FDG-PET and MIB1 expression in patients with NSCLC. Materials and methods: 49 patients (15 adenocarcinomas, 27 squamous cell carcinomas and 7 bronchoalveolar carcinomas) were included in this study; the immunohistochemical expression of cyclin B1 was determined using the tissue-array technique. Each PET was performed 60 minutes after the i.v. administration of 350-518 MBq of FDG on an Advance system (GE) in 2D acquisition mode. Results: cyclin B1 expression was detected in 40 out of 45 cases. The SUV values were higher (p = 0.04) in the cyclin B1+ cases than in the negative cases (16.4 ± 8.1 vs 10.9 ± 6.2). Cyclin B1 expression and SUV values were not correlated with the clinical stage. The expression of cyclin B1+ correlated positively (p < 0.0001) with that of MIB1. After univariate analysis, only the cellular proliferation was a prognostic factor (p = 0.037). Conclusions: our results suggest that there is a direct correlation between cyclin B1 expression and max-SUV values in the PET of NSCLC patients. When the association of cyclin B1 with positive MIB1 is also considered(AU)

[The immunohistochemical expression of cyclooxygenase 2 is inversely associated with (18)F-FDG-PET SUV values in non-small-cell lung cancers. Initial results]. / La expresión inmunohistoquímica intensa de ciclooxigenasa 2 se asocia inversamente con los valores máximos de SUV en la (18)F-FDG-PET de pacientes afectados de carcinomas no microcíticos de pulmón. Relación con otros factores biológicos.

OBJECTIVE: To study the expression of COX-2 and its possible relationship with the maximum standardized uptake value (SUV) in FDG-PET, and EGFR, p16 and MIB1 expression in patients with NSCLC. MATERIAL AND METHOD: 45 patients (12 adenocarcinomas and 33 squamous cell carcinomas) were included in this study; the immunohistochemical expression of COX-2, MIB-1, p16 and EGFR was determined using tissue-array. Each PET was performed 60 minutes after the i.v. administration of 350-518 MBq of FDG on an Advance system (GE) in 2D acquisition mode. RESULTS: COX-2 expression was detected in 35 out of 45 cases, and was very significant (> ++) in 12 of them. SUV values were lower in the COX-2 > ++ cases that in the remaining cases (13.4 +/- 1.2 vs. 12.9 vs. 17.1 +/- 1.5; p = 0.059). COX-2 > ++ expression and maxSUV values were not correlated with the clinical stage. The expression of COX-2 > ++ was correlated positively with p16 (r = 0.36; p = 0.014) and negatively with MIB1 (r = -0.32; p = 0.041) expression, whereas the SUV was correlated positively with EGFR (r = 0.44; p = 0.004) and negatively with p16 (r = -0.29; p = 0.041) expression. CONCLUSIONS: Our results suggest that: a) the expression of COX-2 > ++ is often found in this kind of lung cancer and is not associated with the clinical stage; b) the maxSUVs were not related to the stage and were lower in COX-2 > ++ tumours than in the other cases; and c) the different behaviour of both parameters can be explained by their correlation with cell proliferation (MIB1), EGFR and p16 expression.