Basic Operative Tactics for Pulmonary Echinococcosis in the Era of Endostaplers and Energy Devices.

Human echinococcosis is a zoonotic infection caused by the larvae of the tapeworm species Echinococcus. The liver is the most common location for a primary echinococcosis. However, the parasite may bypass or spread from the liver to the lungs, causing primary or secondary pulmonary echinococcosis, respectively. Pulmonary echinococcosis is a clinically challenging condition in which anthelminthic regiments are important, but surgery has the central role in removing the cysts and preventing recurrences. Surgical treatment may involve cystotomy, enucleation, capitonnage, or atypical resections, which occasionally are in combination with hepatic procedures. The utilization of modern devices is greatly underdescribed in surgery for thoracic infections, even though these facilitate much of the work. Therefore, this article aims to describe pulmonary echinococcosis and the role of modern surgical devices in the treatment process. Furthermore, we report surgical treatment of three different cases of pulmonary echinococcosis. Surgeries of uncomplicated and ruptured hepatic or pulmonary cysts are described. Simple small pulmonary echinococcal lesions can be excised by endostaplers both for diagnostic and curative reasons. Larger cysts can be removed by energy devices unless large bronchial air leaks occur. Complicated cysts require treatment by more extensive techniques. Inexperienced surgeons should not abstain but should carefully decide preoperatively how to proceed.

Does postpneumonectomy empyema improve long-term survival for patients with lung cancer?

Postpneumonectomy empyema (PPE) is life-threatening morbidity that affects up to 10% of patients and carries a 9-13% mortality risk. Treatment can take a long time, and the prognosis is uncertain. Forty years ago, improved survival was reported among patients with lung cancer and pleural empyema compared to those with lung cancer and no empyema. Here we investigated this potential association among patients with PPE. The present study included 38 patients who underwent pneumonectomy between 1995-2007 (7 females, 31 males, median age of 62 years) and then developed PPE, which was treated with the accelerated treatment (AT) method. Thirty-five of these patients had been diagnosed with lung cancer (including one case of carcinoid with infiltration), of whom 31 were matched with 31 lung cancer patients who underwent uncomplicated pneumonectomy at the same center between 1997-2009. The two groups did not significantly differ regarding sex, age, histology, TNM, FEV1, major co-morbidities, or received neoadjuvant or adjuvant therapy. Thirty-five (92.1%) patients from the initial group were treated successfully and the 5- and 10-year survival rates were 69% and 51%, respectively. Comparison between the matched groups revealed longer survival rates in the empyema group (5-year, 70%; 10-year, 49%) compared to the group without empyema (5-year, 38%; 10-year, 18%). Compared to the group without empyema, the empyema group showed significantly longer survival for all-cause mortality (p=0.004) and a lower incidence of cancer-unrelated mortality (p=0.02). The two groups did not significantly differ with regard to cancer-related mortality (p=0.09). In conclusion, accelerated treatment is a safe and effective method for the treatment of pleural empyema after pneumonectomy. The presently achieved results indicate improvement in survival of lung cancer patients with PPE in comparison to lung cancer patients after uncomplicated pneumonectomy.

Relationships Between Quality of Life in the Psychological Domain, Acceptance of Illness, and Healthcare Services in Patients with Asthma.

Asthma patients should be considered not only in terms of the medical aspects, but also the nonmedical issues associated with the psychological domain, since these are factors that can significantly improve patients' health state, quality of life, and illness acceptance, and can contribute to the reduction of healthcare utilization. The purpose of this study was to assess the acceptance of illness among asthma patients and their quality of life in the psychological domain, as well as to identify factors that influence illness acceptance and quality of life in the psychological domain. We examined 172 patients with asthma (median age: 58; range: 18-89 years) recruited from two pulmonology wards. We demonstrate that the patients with low levels of illness acceptance and a high healthcare service index had low quality of life in the mental domain. Older age; being separated, divorced, or widowed; and having BMI > 25, all significantly affect the levels of quality of life and illness acceptance. In conclusion, measurements of health-related quality of life and illness acceptance are useful for estimating the impact and progression of asthma. These results confirm that psychological functioning should be taken into account alongside the somatic state.

Surgeon's viewpoint on lung transplantation in cystic fibrosis patients - preliminary report.

INTRODUCTION: The surgeon's viewpoint on a patient with cystic fibrosis differs from that of a pediatrician or internist. The problems a cystic fibrosis specialist encounters are different from those faced by the surgeon who takes over the patient in a very advanced, often terminal stage of the disease. Hence, the main problem for the surgeon is the decision concerning the surgery (lung transplantation, pneumonectomy, lobectomy). It is, therefore, important to lay down fundamental and appropriate rules concerning the indications and contraindications for lung transplantation, especially in patients with cystic fibrosis. AIM: The aim of this study was to analyze the methods of qualifying and preparing patients for surgery, as well as carrying out the procedure of transplantation and postoperative short and long-term care. MATERIAL AND METHODS: The investigation was carried out on 16 patients with cystic fibrosis. Three were operated on and 10 were on the waiting list for transplantation. Two patients on the waiting list died, one patient was disqualified from transplantation. During qualification for lung transplantation, strict indications, contraindications and other factors (such as blood type, patient's height, coexisting complications) were taken under consideration. RESULTS: All the 3 patients after lung transplantation are alive and under our constant surveillance. Ten patients await transplantation, though four of them are suspended due to hepatitis C infection. Two patients on the waiting list died: one from respiratory insufficiency and the other in the course of bridge to-transplant veno-venous extracorporeal membrane oxygenation due to hepatic failure. One patient has been disqualified because of cachexia. CONCLUSIONS: Since lung transplantation is the final treatment of the end-stage pulmonary insufficiency in cystic fibrosis patients, the number of such procedures in cystic fibrosis is still too low in Poland. The fast development of these procedures is highly needed. It is necessary to develop better cooperation between different disciplines and specialists, especially between pediatricians and surgeons. The correct choice of the suitable moment for lung transplantation is crucial for the success of the procedure.

[Diagnostic and therapeutic difficulties in mediastinal fibromatosis. Case report]. / Trudnosci w diagnostyce i leczeniu wlókniakowatosci sródpiersia. Opis przypadku.

Mediastinal fibromatosis is a very rare mesenchymal tumor originated from fibrous tissue. A case of 26-year old men with mediastinal tumor causes respiratory insufficiency and dysphagia is described. This sympthoms occured due to esophageal impression and infiltration with occlusion of main left bronchus by mediastinal tumor. Ethiology of the tumor was established based on histopathology assesment of the tissue samples taken during explorative thoracotomy after 3 years and many other diagnostic procedures undertaken. The authors describe difficulties in diagnosis of mediastinal tumors, especially those rare observed.

[Primary pulmonary mucosa-associated lymphoid tissue lymphoma: a case report]. / Chloniak typu MALT o lokalizacji plucnej - opis przypadku.

Primary pulmonary lymphoma accounts only 0,5% of all primary lung neoplasms. Mucosa-associated lymphoid tissue (MALT) lymphoma is a low grade B-cell extranodal lymphoma. It is a quite infrequent entity, however it constitutes from 72% to 90% of all pulmonary lung lymphomas. Long-term stimulation of bronchus-associated lymphoid tissue by antigens, smoking, inflammatory disorders or autoimmune diseases are thought to be leading to the development of MALT lymphoma. We present the case of primary pulmonary mucosa-associated lymphoid tissue lymphoma. A 76-year-old man with a history of heavy smoking (22.5 pack years) was admitted to the hospital for a further diagnostics of an abnormal finding in the right lung visualized on the chest X-ray. The diagnostic process, including imagining studies did not reveal the etiology of a lesion in the right lung. The patient was qualified for surgical diagnostics. The histological finding confirmed extranodal marginal low-grade B-cell lymphoma of mucosa -associated lymphoid tissue.

Selenium as a marker of cancer risk and of selection for control examinations in surveillance.

Publication is summarization of existing data being results of literature review and our experience on usefulness of selenium as a diagnostic marker selection for control examinations in surveillance and as a marker of patients with high risk of cancers.

Pulmonary benign metastasizing leiomyoma from the uterine leiomyoma: a case report.

BACKGROUND: Benign metastasizing leiomyoma (BML) is a rare condition described as multiple well-differentiated leiomyomas at sites distant from the uterus. Apart from lungs it has also been reported in lymph nodes, heart, brain, bone, skin, eye and spinal cord. We present a case of pulmonary benign metastasizing leiomyoma in a female patient admitted to our hospital with suspicion of left adnexal tumor. CASE REPORT: A 45-year-old woman was referred to our hospital with suspicion of left adnexal tumor. The control transvaginal ultrasound examination performed at admission to the Gynecological Department excluded adnexal neoplasm. However, a large amount of fluid within the Douglas pouch raised the oncological concern. The patient underwent myomectomy in 2005. In the same year she was diagnosed with multiple lung nodules and underwent pulmonary wedge resection with the diagnosis of pulmonary benign metastasizing leiomyoma being stated. The decision of reevaluation of the specimen, control CT and puncture of the Douglas pouch fluid was made. Computed tomography performed at the Department of Diagnostic Imaging and Interventional Radiology of the Pomeranian Medical University Hospital revealed multiple, bilateral nodules. The microscopic examination of the samples confirmed the initial diagnosis of benign metastasizing leiomyoma with no evidence of neoplastic cells within the fluid. CONCLUSIONS: Pulmonary benign metastasizing leiomyoma is a rare entity. However, it should be always taken into consideration in women with a previous or coincident history of uterine leiomyoma, especially when no evidence of other malignancy is present.

The assessment of the role of baseline low-dose CT scan in patients at high risk of lung cancer.

BACKGROUND: Despite the progress in contemporary medicine comprising diagnostic and therapeutic methods, lung cancer is still one of the biggest health concerns in many countries of the world. The main purpose of the study was to evaluate the detection rate of pulmonary nodules and lung cancer in the initial, helical low-dose CT of the chest as well as the analysis of the relationship between the size and the histopathological character of the detected nodules. MATERIAL/METHODS: We retrospectively evaluated 1999 initial, consecutive results of the CT examinations performed within the framework of early lung cancer detection program initiated in Szczecin. The project enrolled persons of both sexes, aged 55-65 years, with at least 20 pack-years of cigarette smoking or current smokers. The analysis included assessment of the number of positive results and the evaluation of the detected nodules in relationship to their size. All of the nodules were classified into I of VI groups and subsequently compared with histopathological type of the neoplastic and nonneoplastic pulmonary lesions. RESULTS: Pulmonary nodules were detected in 921 (46%) subjects. What is more, malignant lesions as well as lung cancer were significantly, more frequently discovered in the group of asymptomatic nodules of the largest dimension exceeding 15 mm. CONCLUSIONS: The initial, low-dose helical CT of the lungs performed in high risk individuals enables detection of appreciable number of indeterminate pulmonary nodules. In most of the asymptomatic patients with histopathologically proven pulmonary nodules greater than 15 mm, the mentioned lesions are malignant, what warrants further, intensified diagnostics.

Evaluation of the effects of postoperative pleural empyema on survival rates of patients after pneumonectomy due to non-small cell lung cancer.

Introduction: Postpneumonectomy empyema (PPE) is a severe and often fatal complication of pneumonectomy, but some benefits of PPE were reported in patients who underwent either lobe or an entire lung resection due to lung cancer. Aim: To compare the survival outcomes of patients with non-small-cell lung carcinoma (NSCLC), who developed PPE after pneumonectomy with uneventful recoveries available in our center's database. Material and methods: Outcomes of 928 pneumonectomies performed due to NSCLC between 1995 and 2009 were evaluated. The selection of the control group took into account the requirements for propensity score matching in terms of follow-up period, age, sex, tumor histopathology, TNM classification and the side of surgery. Results: Thirty-two patients with a PPE syndrome and 96 patients without complications after pneumonectomy were included. The estimated 5- and 10-year survival rates were 71% and 59%, respectively. The average and median survival was almost two- and three-fold longer compared to the group with uneventful recoveries. A 2-fold lower cancer-related mortality rate and a 1.5-fold higher cancer-unrelated mortality rate were noted in the PPE group as opposed to the group without complications. Having recovered from PPE, the patients had their risk of death reduced by 2.5-fold and 3.5-fold due to all causes and cancer, respectively. Conclusions: Pleural empyema in NSCLC patients who underwent pneumonectomy seems to improve the survival outcomes compared to patients with uneventful recoveries.

Examination of resistance of various methods of pulmonary vessel occlusion to hydrostatic pressure.

Objective: The aim of this study was to compare pressure resistance of the most common methods of vessel occlusion during thoracic surgical procedures: ligations, clips, and vascular endostaplers. Methods: Pulmonary vessels were obtained during routine thoracic surgeries. A ball-tipped cannula was inserted through an opening in the side wall and secured with a linen ligature from slipping out. Subsequently, saline was infused into the vessel. We recorded the pressure on which a leakage occurred. Results: A total of 65 vessels, divided between 3 groups, were enrolled in the study. In the endostaplers group, median bursting pressures were 262.5 mmHg and 300 mmHg for arteries and veins, respectively. In the case of clips, it was over 750 mmHg in both types of the vessels. The same results were observed in the ligation group. Minimal bursting pressures in endostapler occlusion were 187.5 mmHg and 225 mmHg in arteries and veins, respectively. In the case of clips, it was 600 mmHg for arteries and 675 mmHg for veins. A total of 525 mmHg (arteries) and 750 mmHg (veins) were the minimal leaking values observed in vessels occluded with ligations. Comparative analysis showed statistically significant differences in endostapler-clips and endostapler-ligations pairs (p < 0.001). There were no differences between clips and ligations. Conclusions: The examined methods are capable of occluding pulmonary vessels under physiological conditions. Furthermore, ligations and clips are resistant to pressures highly exceeding physiological values.

Analysis of Donor to Recipient Pathogen Transmission in Relation to Cold Ischemic Time and Other Selected Aspects of Lung Transplantation-Single Center Experience.

BACKGROUND: Infections are one of the leading causes of death in the early postoperative period after lung transplantation (LuTx). METHODS: We analyzed 59 transplantations and culture results of the donor bronchial aspirates (DBA), graft endobronchial swabs (GES), and recipient cultures (RC) before and after the procedure (RBA). We correlated the results with a cold ischemic time (CIT), recipient intubation time, and length of stay in the hospital and intensive care unit (ICU), among others. RESULTS: CIT of the first and second lungs were 403 and 541 min, respectively. Forty-two and eighty-three percent of cultures were positive in DBA and GES, respectively. Furthermore, positive results were obtained in 79.7% of RC and in 33.9% of RBA. Longer donor hospitalization was correlated with Gram-negative bacteria isolation in DBA. Longer CIT was associated with Gram-positive bacteria other than Staphylococcus aureus in GES and it resulted in longer recipient stay in the ICU. Furthermore, longer CIT resulted in the development of the new pathogens in RBA. CONCLUSION: Results of GES brought more clinically relevant information than DBA. Donor hospitalization was associated with the occurrence of Gram-negative bacteria. Positive cultures of DBA, GES, and RBA were not associated with recipient death.

Comparison of peripheral blood saturation with brain oxygenation in patients undergoing thoracic surgery.

Introduction: Near-infrared spectroscopy (NIRS) is a non-invasive method of regional tissue oxygenation measurement. Intraoperative use of NIRS to monitor brain oxygenation (BO) during surgery might be beneficial to identify cerebral desaturations. Aim: To compare peripheral blood saturation (SpO2) with BO measurements and evaluate the utility of BO in thoracic surgery. Material and methods: We took BO and SpO2 measurements in a group of 100 patients undergoing standard thoracic surgery. Measurements were made every 15 minutes. The Mann-Whitney U test was used to compare study groups. Spearman's rank correlation coefficient was used to determine correlation between studied parameters. Results: We found a negative correlation between patients' age and BO at the beginning of surgery. Operations lasted between 30 and 200 minutes. We found a positive correlation between BO and SpO2 between 15 and 90 minutes of surgery. Subsequently, BO remained at a low level while SpO2 returned to baseline values. Higher minimum SpO2 values were noted in patients undergoing left-sided procedures. Conclusions: Cerebral oxygenation does not return to baseline values until the end of the surgery as opposed to the SpO2. Furthermore, both SpO2 and BO correlate negatively with the overall duration of thoracic surgery. In addition, after 90 minutes of surgery, SpO2 stopped reflecting brain oxygenation.

[Surgical treatment of malignant lung tumors in solid organ recipients]. / Leczenie operacyjne nowotworów pluc u biorców przeszczepów narzadów litych.

Diagnostic difficulties, serious prognosis and often insufficient response to treatment are all common features of pulmonary complications in solid organ recipients. Some of these complications need invasive diagnostic procedures and surgical treatment or prolonged pharmacological treatment. Tuberculosis, Pneumocystis and fungal infections are examples of infectious complications. Primary lung cancer or metastasis to the lungs developed shortly after solid organ transplantation are oncological complications. Infectious and noninfectious complications are connected with immunosuppression. Treatment of pulmonary complications in solid organ recipients and continuation of immunosuppression therapy can be challenge for therapeutic team. This article presents five cases (2 women and 3 men) of solid organ recipients treated in department of the authors due to lung neoplasms. Four of them were liver recipients and one was recipient of heart. Three patients were treated due to primary lung cancer, additionally in one of them metastasis of lung cancer occurred, two suffered from metastasis of liver cancer (hepatocellular carcinoma) to the lungs. Four patients underwent 6 operation: 2 lobectomies with lymphadenectomy, 1 segmentectomy with lymphadenectomy, 1 bilateral metastasectomy of HCC and 1 metastasectomy of lung cancer. In all cases of primary lung cancer pathological examination revealed squamous cell carcinoma. Immunosuppression schedule, perioperative courses and infectious complications (tuberculosis, disseminated infection, infection of biliary tract, oesophageal candidiasis) in this group were described. All of them were smokers.

Right Heart Echocardiography Parameters and Other Predictors to Evaluate Mechanical Cardiac Support Necessity During Lung Transplantation.

BACKGROUND: Lung transplantation (LuTx) is a challenge when right heart function fails. Mechanical circulatory support (MCS) is then necessary. METHODS: We aimed to investigate whether preoperative transthoracic echocardiography (TTE) can predict MCS use and help to exclude the sickest patients. Between 2011 and 2018, 52 patients at our institution received LuTx and qualified for this study: 35 bilateral, 16 single, 1 lobar [1] and 1 retransplantation procedure. Of these, 22 were operated using MCS and 30 without MCS. The patients were aged between 18 and 65 years, and 23 were women. The indications were lung fibrosis for 18 patients, chronic obstructive lung disease for 16, cystic fibrosis for 15, primary pulmonary hypertension for 2 and bronchiectasis for 1. TTE was performed up to 30 days before treatment and 1 to 7 days after. RESULTS: Patients undergoing MCS versus patients not undergoing MCS: preoperative right ventricular systolic pressure 56.5 (30) vs 37.8 (11.5) mm Hg (P = .03); tricuspid regurgitation pressure gradient 48.7 (27) vs 30.2 (10.8) mm Hg (P = .015); tricuspid annular plane systolic excursion 17.8 (4.3) vs 19.9 (2.8) mm Hg (P = .04); pulmonary artery diameter 27.5 (5.2) vs 23.9 (4.1) mm (P = .004); age 41.9 (14.1) vs 54.3 (11.8) years (P = .001). Patients who were Dead versus patients who were alive pulmonary valve acceleration time of 82.8 (24.1) vs 104.9 (27.2) ms (hazard ratio [HR] = 0.959, 95% confidence interval [CI] = 0.923-0.996 per ms, P = .02) and pulmonary artery diameter of 28.9 (5.8) vs 24.4 (4.1) mm HR = 1.225, 95% CI = 1.028-1.460 per 1 mm, P = .016 were predictors of death. CONCLUSIONS: Preoperative TTE parameters: right ventricular systolic pressure, tricuspid regurgitation pressure gradient, tricuspid annular plane systolic excursion, and pulmonary artery diameter predicted MCS use during LuTx. Certain values of valve acceleration time and pulmonary artery diameter could help discern LuTx qualification.

Benign Metastasizing Leiomyoma of the Lung: Diagnostic Process and Treatment Based on Three Case Reports and a Review of the Literature.

Uterine leiomyomas may occasionally spread to the lungs forming nodular lesions detectable on chest X-ray. This condition known as benign metastasizing leiomyoma (BML) usually occurs in females with a history of hysterectomy or myomectomy. We present three cases of BML demonstrating the diagnostic process and treatment approaches. Two patients presented with the more common multiple-nodule variant while the other had a single mass, but all were symptom-free. The age of presented patients at diagnosis of BML ranged from 46-53. The first patient was diagnosed with BML at the age of 50, and 12 years prior to the diagnosis, underwent a supracervical hysterectomy. The second patient had a myomectomy at 36, and BML was diagnosed 17 years later at the age of 53. The third patient had a hysterectomy with bilateral salpingo-oophorectomy at the age of 46, with lung lesions present before the hysterectomy. Immunohistochemical studies of postoperative materials showed positive staining of spindle cells with antibodies against desmin and smooth muscle actin, as well as estrogen and progesterone receptors. The final histopathological diagnoses were pulmonary BML. All patients are stable and symptom-free: two at two years follow-up and one at six months follow-up.

Central, peripheral ECMO or CPB? Comparsion between circulatory support methods used during lung transplantation.

BACKGROUND: Chronic obstructive pulmonary disease, cystic fibrosis and usual interstitial pneumonia are three most common indications for lung transplantation (LuTx) in Poland. As a result of irreversible destruction of pulmonary parenchyma and extended respiratory insufficiency that appear afterwards, it is crucial to estimate the reserve of gas exchange in each lung before and during surgery. Altering conditions of gas exchange require adaptation in circulatory system as well. In some of the cases the use of extracorporeal life support appears to be necessary to undergo the transplantation successfully. Cardiopulmonary bypass (CPB) or extracorporeal membrane oxygenation (ECMO) used during operation allow to replace the function of heart and lung, but they are also related to complications in the form of acute kidney failure, bleeding, heart arrhythmias or thromboembolic complications. METHODS: We reviewed 77 LuTx from 2009 to 2020 performed at the Department of Thoracic Surgery and Transplantation. 40/77 (51%) patients required intraoperative extracorporeal assistance: 8 required CBP and 32 required ECMO. In the ECMO group 14/32 (44%) patients had peripheral cannulation and 18/32 (56%) had central one. We have calculated the survival rates and reviewed postoperative complications after lung transplantations. Cumulative Kaplan-Meier survival curves were calculated. Differences between the groups were evaluated by the Chi- square analysis for discontinuous variables and t-test for continuous variables. RESULTS: The use of intraoperative central extracorporeal membrane oxygenator was associated with increased survival rates comparing to patients without external support (30-days, 1-year, 3-years, 5-years rates: 78%, 66%, 66%, 66% vs 83%, 65%, 59%, 44% respectively). Furthermore, survival was enhanced comparing to peripheral ECMO or cardiopulmonary bypass as well (50%, 41%, 41%, 33%; 75%, 50%, 50%, 38% respectively). Acute kidney injury and thromboembolic complications occurred statistically more often in case of patients that underwent lung transplantation with support devices (p = 0.005, p = 0.02 respectively). Frequency of other complications was comparable among groups. CONCLUSIONS: The use of central extracorporeal membrane oxygenation should be favorized over peripheral cannulation or cardiopulmonary bypass. CPB should be no longer used during LuTx. Trial registration Not applicable.

Influence of the Levels of Arsenic, Cadmium, Mercury and Lead on Overall Survival in Lung Cancer.

The effects of heavy metals on cancer risk have been widely studied in recent decades, but there is limited data on the effects of these elements on cancer survival. In this research, we examined whether blood concentrations of the heavy metals arsenic, cadmium, mercury and lead were associated with the overall survival of lung cancer patients. The study group consisted of 336 patients with lung cancer who were prospectively observed. Blood concentrations of heavy metals were measured to study the relationship between their levels and overall survival using Cox proportional hazards analysis. The hazard ratio of death from all causes was 0.99 (p = 0.94) for arsenic, 1.37 (p = 0.15) for cadmium, 1.55 (p = 0.04) for mercury, and 1.18 (p = 0.47) for lead in patients from the lowest concentration quartile, compared with those in the highest quartile. Among the patients with stage IA disease, this relationship was statistically significant (HR = 7.36; p < 0.01) for cadmium levels in the highest quartile (>1.97-7.77 µg/L) compared to quartile I (0.23-0.57 µg/L, reference). This study revealed that low blood cadmium levels <1.47 µg/L are probably associated with improved overall survival in treated patients with stage IA disease.

Blood cadmium levels as a marker for early lung cancer detection.

BACKGROUND: We assessed whether blood cadmium levels were associated with incident lung cancer and could be used in the context of a screening program for early-stage lung cancer. MATERIAL AND METHODS: We measured blood cadmium levels among 205 lung cancer patients and 205 matched controls. Cases and controls were matched for sex, age and smoking history (total pack-years, years since cessation for former smokers). RESULTS: The odds ratio for those in the highest quartile of cadmium level (versus lowest) was four-fold (OR = 4.41, 95 % CI:2.01-9.67, p < 0.01). The association was present in former smokers (OR = 16.8, 95 % CI:3.96-71.2, p < 0.01), but not in current smokers (OR = 1.23, 95 % CI: 0.34-4.38) or in never smokers (OR not defined). Among former smokers, the association was present in both early- and late-stage lung cancer. CONCLUSION: Blood cadmium levels may be a marker to help with the early detection of lung cancer among former smokers.

Impact of copy number variant and single nucleotide polymorphism of the programmed death-ligand 1 gene, programmed death-ligand 1 protein expression and therapy regimens on overall survival in a large group of Caucasian patients with non-small cell lung carcinoma.

Anti-programmed death-1 or anti-programmed death-ligand 1 (PD-L1) blockade may be ineffective in some patients with non-small cell lung cancer (NSCLC) with high percentage of tumor cells with PD-L1 expression. In addition, immunotherapy may provide great benefits in patients without PD-L1 expression. The present study assessed PD-L1 protein expression by immunohistochemistry, copy number variation (CNV) of PD-L1 and two single nucleotide polymorphisms (SNPs), rs822335 and rs822336, in the promoter of PD-L1 by quantitative PCR in 673 patients with NSCLC. Overall survival time of patients with NSCLC depending on the assessed predictive factors (PD-L1 CNV or SNP) and the treatment methods (immunotherapy in first/second line of treatment or chemotherapy) was analyzed. The present study revealed significantly higher PD-L1 copies number in patients with ≥10% and ≥50% of tumor cells with PD-L1 expression compared to patients with lower percentage of PD-L1-positive tumor cells (P=0.02 and P=0.0002, respectively). There was a significant positive correlation (R=0.2; P=0.01) between number of PD-L1 copies and percentage of tumor cells with PD-L1 protein expression. Percentage of tumor cells with PD-L1 expression was lower in patients with TT genotype of the rs822335 polymorphism compared to those with CC genotype (P=0.03). The present study observed significantly higher risk of death in patients treated with chemotherapy compared to those treated with immunotherapy (P<0.0001; hazard ratio=2.4768; 95% confidence interval, 2.0120-3.0490). The present study demonstrated a close relationship between PD-L1 copies number, genotype of rs822335 PD-L1 polymorphism and PD-L1 protein expression on tumor cells. However, the impact of CNV and SNPs of PD-L1 on overall survival of patients with NSCLC requires further investigation.