Factors associated with diagnosis of stages I and II lung cancer: a multivariate analysis

Smoking, mortality, access to diagnosis, and treatment of lung cancer in Brazil

INTRODUCTION

Lung cancer (LC) is a relevant public health problem in Brazil and worldwide, given its high incidence and mortality. Thus, the objective of this study is to analyze the distribution of smoking and smoking status according to sociodemographic characteristics and disparities in access, treatment, and mortality due to LC in Brazil in 2013 and 2019.

METHOD

Retrospective study of triangulation of national data sources: a) analysis of the distribution of smoking, based on the National Survey of Health (PNS); b) investigation of LC records via Hospital-based Cancer Registry (HCR); and c) distribution of mortality due to LC in the Mortality Information System (SIM).

RESULTS

There was a decrease in the percentage of people who had never smoked from 2013 (68.5%) to 2019 (60.2%) and in smoking history (pack-years). This was observed to be greater in men, people of older age groups, and those with less education. Concerning patients registered in the HCR, entry into the healthcare service occurs at the age of 50, and only 19% have never smoked. While smokers in the population are mainly Mixed-race, patients in the HCR are primarily White. As for the initial stage (I and II), it is more common in White people and people who have never smoked. The mortality rate varied from 1.00 for people with higher education to 3.36 for people without education. Furthermore, White people have a mortality rate three times higher than that of Black and mixed-race people.

CONCLUSION

This article highlighted relevant sociodemographic disparities in access to LC diagnosis, treatment, and mortality. Therefore, the recommendation is to strengthen the Population-Based Cancer Registry and develop and implement a nationwide LC screening strategy in Brazil since combined prevention and early diagnosis strategies work better in controlling mortality from the disease and continued investment in tobacco prevention and control policies.

Factors associated with late-stage diagnosis and overall survival for lung cancer: An analysis of patients treated in a Brazilian hospital and a US-hospital from 2009 to 2019

BACKGROUND

Lung cancer is a major public health problem due to its high incidence and mortality rates worldwide. Histology, socioeconomic conditions, access, quality of healthcare, and regional aspects are associated with lung cancer stages at diagnosis and survival outcomes. This paper aims to examine and contrast the factors associated with late-stage diagnosis of lung cancer and overall survival rates in two different settings: a Brazilian hospital and a US hospital, spanning from 2009 to 2019.

METHODS

This is a retrospective cohort study of the incidence of lung cancer cases at the institution's cancer registry from a Brazilian and a US-based cohort. Descriptive analyses are presented using either the mean and standard deviation or the median and interquartile interval. Frequency is used to present categorical variables. Factors associated with late-stage lung cancer diagnosis were identified through bivariate and multivariable forward stepwise logistic regression. One-year overall survival and its associated factors were identified by Kaplan-Meier curves and Cox's proportional hazards model.

RESULTS

Between January 2009 and December 2019, a total of 5286 individuals were diagnosed with LC in the Brazilian cohort, and out of these cases, 85.6% were diagnosed with late-stage disease. The US-cohort consisted of 3594 individuals, of whom 60.3% were diagnosed with late-stage disease in lung cancer. The one-year overall survival was 8.6 months for the US cohort and 6.4 months for the Brazilian cohort. In both cohorts, late-stage diagnosis emerged as the most significant factor influencing overall survival. However, the factors associated with late-stage diagnosis differed between the US and Brazilian cohorts. In the Brazilian cohort, being male and belonging to black or brown ethnic groups, along with having a lower education level, were linked to late-stage diagnosis. On the other hand, in the US-based cohort, the factors related to late-stage diagnosis were being male, having been diagnosed before 2015, and possessing private insurance coverage.

CONCLUSION

Late-stage diagnosis was associated with the worst survival in both the US and Brazilian cohorts. This study provides valuable information on inequities and barriers to access for lung patients with cancer from upper-middle-income and high-income countries.

Delays in Lung Cancer Diagnosis: Observations from a Tertiary Care Centre in Kerala, India

Merin YohannanIntroduction  Timely diagnosis of lung cancer is critical because treatment outcomes correspond to the stage of disease. This study identified patient and physician determined reasons for diagnostic delays. Materials and Method s This was an observational cross-sectional study, conducted at a tertiary care institution in South India, for 12 months. From 207 consecutively selected patients, with a presumptive lung cancer diagnosis, 150 were enrolled utilizing a prefixed questionnaire. The time intervals from appreciation of initial respiratory symptoms to a final tissue diagnosis were defined sequentially as approach interval, referral interval, and diagnostic interval and factors causing delay in each interval were identified. Results  In a state with 100% literacy, the mean time to approach a doctor was 8 weeks (range: 0-336 days; SD: 7.95) with a delay seen in 52% of the study group. Referring a suspect lung cancer diagnosis to a specialist, took an average of 4.98 weeks (range: 1-26 weeks; SD: 5.64) with referral delays in 47.3% of patients. The mean diagnostic interval was 9.21 days (range: 3-41 days; SD: 7.18) and 16.7% of cases had diagnostic delays in spite of a definite procedure. Conclusion  In a tuberculosis endemic location, empirical treatment with anti-tuberculosis therapy and prolonged antibiotic courses without serially monitoring the course of disease are responsible for referral delays. Also, 88.2% of the total females studied, presented late due to family and work pressures, fear of being stigmatized and being on prolonged home remedies. A wider dissemination and awareness on lung cancer are needed especially among females. A low threshold to reinvestigate and an early referral to a pulmonary or lung cancer specialist, when expected clinicoradiological improvement is lacking, in microbiologically negative tuberculosis should be highlighted.

Clinical Efficacy of Single-Port Thoracoscopic Lobectomy versus Three-Port Thoracoscopic Lobectomy for Lung Cancer

Objective

To evaluate the clinical efficacy of single-port thoracoscopic lobectomy versus three-port thoracoscopic lobectomy for lung cancer.

Methods

From February 2020 to February 2021, 200 lung cancer patients treated in our institution assessed for eligibility were enrolled and randomly assigned (1 : 1) to either the experimental group (single-port thoracoscopic lobectomy) or the control group (three-port thoracoscopic lobectomy). The outcomes were the eligible patients' surgical indices, pain stress indexes, and postoperative complications.

Results

The experimental group outperformed the control group in terms of incision length, postoperative drainage time, extubation time, time to get out of bed, time to analgesics administration, and postoperative pain score (P < 0.001). Compared with the control group, the experimental group reduced the intraoperative bleeding (161.98 ± 10.65 versus 179.65 ± 14.20, P < 0.001) and length of hospital stay (7.98 ± 0.56 versus 10.46 ± 1.23, P < 0.001). The operative time of the single-port thoracoscopic lobectomy was longer than that of the three-port thoracoscopic lobectomy (P < 0.001). There was no statistical difference between the two groups in the intraoperative conversion to thoracotomy and the number of lymph node dissections (P > 0.05). Postoperative pain stress indices and complication rates of the experimental group were significantly lower than those of the control group (P < 0.001).

Conclusion

Single-port thoracoscopic lobectomy can improve the perioperative indices of lung cancer patients, reduce their pain stress response, and accelerate postoperative recovery. However, its operation is difficult and time-consuming, requiring experienced surgeons for improved surgical outcomes in practice.

Detection and Quantification of Tp53 and p53-Anti-p53 Autoantibody Immune Complex: Promising Biomarkers in Early Stage Lung Cancer Diagnosis

Lung cancer is a leading cause of death worldwide, claiming nearly 1.80 million lives in 2020. Screening with low-dose computed tomography (LDCT) reduces lung cancer mortality by about 20% compared to standard chest X-rays among current or heavy smokers. However, several reports indicate that LDCT has a high false-positive rate. In this regard, methods based on biomarker detection offer excellent potential for developing noninvasive cancer diagnostic tests to complement LDCT for detecting stage 0∼IV lung cancers. Herein, we have developed a method for detecting and quantifying a p53-anti-p53 autoantibody complex and the total p53 antigen (wild and mutant). The LOD for detecting Tp53 and PIC were 7.41 pg/mL and 5.74 pg/mL, respectively. The detection ranges for both biomarkers were 0–7500 pg/mL. The known interfering agents in immunoassays such as biotin, bilirubin, intra-lipid, and hemoglobin did not detect Tp53 and PIC, even at levels that were several folds higher levels than their normal levels. Furthermore, the present study provides a unique report on this preliminary investigation using the PIC/Tp53 ratio to detect stage I–IV lung cancers. The presented method detects lung cancers with 81.6% sensitivity and 93.3% specificity. These results indicate that the presented method has high applicability for the identification of lung cancer patients from the healthy population.