Management of occult malignant pleural disease firstly detected at thoracotomy for non-small cell lung cancer patients

Computed Tomography-Based Radiomic Nomogram to Predict Occult Pleural Metastasis in Lung Cancer

OBJECTIVES

The preoperative identification of occult pleural metastasis (OPM) in lung cancer remains a crucial clinical challenge. This study aimed to develop and validate a predictive model that integrates clinical information with chest CT radiomic features to preoperatively identify patients at risk of OPM.

METHODS

This study included 50 patients diagnosed with OPM during surgery as the positive training cohort and an equal number of nonmetastatic patients as the negative control cohort. Using least absolute shrinkage and selection operator (LASSO) logistic regression, we identified key radiomic features and calculated radiomic scores. A predictive nomogram was developed by combining clinical characteristics and radiomic scores, which was subsequently validated with data from an additional 545 patients across three medical centers.

RESULTS

Univariate and multivariate logistic regression analyses revealed that carcinoembryonic antigen (CEA), the neutrophil-to-lymphocyte ratio (NLR), the clinical T stage, and the tumor-pleural relationship were significant clinical predictors. The clinical model alone achieved an area under the curve (AUC) of 0.761. The optimal integrated model, which combined radiomic scores from the volume of interest (VOI) with the CEA and NLR, demonstrated an improved predictive performance, with AUCs of 0.890 in the training cohort and 0.855 in the validation cohort.

CONCLUSIONS

Radiomic features derived from CT scans show significant promise in identifying patients with lung cancer at risk of OPM. The nomogram developed in this study, which integrates CEA, the NLR, and radiomic tumor area scores, enhances the precision of preoperative OPM prediction and provides a valuable tool for clinical decision-making.

Primary tumour resection in non-small cell lung cancer patients with pleural dissemination unexpectedly detected during operation: a two-centre retrospective cohort study

BACKGROUND

There is no consensus regarding whether primary tumour resection (PTR) should be performed in non-small cell lung cancer (NSCLC) patients with unexpected pleural dissemination (PD) discovered at thoracotomy.

MATERIALS AND METHODS

Consecutive NSCLC patients with surgically confirmed PD were retrospectively enrolled from two high-volume centres between January 2016 and December 2023. Patients were divided into the primary tumour resection (PTR) and exploratory thoracotomy (ET) group. PTR included wedge resection, segmentectomy and lobectomy. Patients in the ET group received biopsy only. Propensity score matching (PSM) was used to reduce selection bias from confounding factors. Disease-specific survival (DSS) and progression-free survival (PFS) were analysed using the Kaplan‒Meier method, and comparisons were made using the log-rank test. Multivariate Cox regression analyses were performed to identify the independent prognostic factors.

RESULTS

A total of 223 patients were identified: 167 (74.9%) in the PTR group and 56 (25.1%) in the ET group. The median follow-up time and median survival time (MST) were 39.0 months and 49.0 months, respectively. The MST for the ET and PTR groups were 44.0 and 60.0 months, respectively (HR 0.80, 95% CI 0.51-1.24; p = 0.3097). After PSM, there were no significant differences in terms of median disease-specific survival (DSS: 60.0 vs. 61.0 months, p = 0.3419) or progression-free survival (PFS: 30.0 vs. 47.0 months, p = 0.5471) between the two groups. Multivariate analysis revealed that smoking history and a tumour size ≥ 3 cm were independent risk factors for DSS and PFS, whereas targeted therapy was an independent protective factor.

CONCLUSION

Our results suggest that primary tumour resection does not improve long-term survival in NSCLC patients with unexpected PD discovered at thoracotomy. It is high time to re-evaluate the value of surgery for NSCLC patients with PD and avoid overtreatment, especially in the era of targeted therapy and immunotherapy.

TRIAL REGISTRATION

ClinicalTrials.gov NCT06232967 (approval date: January 31, 2024).

Prognostic Value of Surgical Resection for Non-small-cell Lung Cancer Patients Comorbid With Minimal Pleural Effusion

BACKGROUND

The proportion and impact of minimal pleural effusion (PE) on prognosis remain blurred in operable non-small cell lung cancer (NSCLC) patients who reported minimal PE on imaging.

METHODS

Clinical and prognostic data of operable NSCLC patients who presented no distant metastasis, no direct pleural invasion, but minimal PE on preoperative imaging were retrospectively analyzed. The patients were divided into surgical (81 cases) and non-surgical (10 cases) cohorts. Potential or suspected malignant PE or pleural metastases were confirmed by surgery. The overall survival (OS) was analyzed by Kaplan-Meier curve and prognostic factors by multivariate Cox regression.

RESULTS

The surgical cohort reported no pleural invasion on preoperative imaging and no pleural metastases by postoperative pathology, with an overall median disease-free survival of 36.7 (28.6, 44.7) months and a median OS of 59.8 (45.7, 73.2) months, with the latter significantly longer in the surgical cohort than in the non-surgical cohort (59.8 months vs 20.37 months, P < 0.001). Multivariate analysis indicated surgical treatment as an independent prognostic factor for OS.

CONCLUSION

Malignant PE is rare in operable NSCLC patients who report the presence of minimal PE but no distant metastasis or direct pleural invasion on preoperative imaging. Surgery may be the preferred treatment for these patients.

Prognosis evaluation and efficacy analysis of different treatment options for patients with visceral pleural invasion in stage IIA-IIB lung cancer

OBJECTIVE

Controversy surrounds the treatment of visceral pleural invasion in lung cancer, and no studies have compared the efficacy of its four main treatment options (i.e., surgery, chemotherapy, targeted therapy, and immunotherapy). This study aims to compare and analyze surgery, chemotherapy, targeted therapy, and immunotherapy outcomes and explore the optimal treatment of visceral pleural invasion in lung cancer.

METHODS

We searched electronic databases (i.e., Pubmed, Embase, Cochrane Library, CNKI, and Chinese Biomedical Literature Database Search) for relevant studies of treatment options for patients with visceral pleural invasion in stage IIA-IIB lung cancer. Searches times were limited to studies published between January 1, 2000 and February 20, 2021. Meta analysis was performed using RevMan 5.3 software We also downloaded original RNA transcription data about lung cancer invasion in the GEO and TCGA tumor databases, and used R 4.0.3 software to perform differential expression and co-expression gene network analyses.

RESULTS

We included a total of 25 high-quality (i.e., Jadad score 4-7) studies. Meta-analysis found that surgical treatment was associated with a 3-year survival rate OR = 3.80 (95% CI 3.53, 4.09; P < 0.0001), 5-year survival rate OR = 4.10 (95% CI 3.72, 4.53; P < 0.0001), and median survival time OR = 2.71 (95% CI 2.53, 2.89; P < 0.0001). Chemotherapy was associated with a 3-year survival rate OR = 2.08 (95% CI 1.93, 2.25; P < 0.0001), 5-year survival rate OR = 1.68 (95% CI 1.49, 1.89; P < 0.0001), and median survival time OR = 1.84 (95% CI 1.66, 2.04; P < 0.0001). Targeted therapy was associated with a 3-year survival rate OR = 2.91 (95% CI 2.65, 3.19; P < 0.0001), 5-year survival rate OR = 1.83 (95% CI 1.39, 2.33; P < 0.0001), and median survival time OR = 1.76 (95% CI 1.59, 1.94; P < 0.0001). Finally, immunotherapy was associated with a 3-year survival rate OR = 1.89 (95% CI 1.73, 2.07; P < 0.0001), 5-year survival rate OR = 1.66 (95% CI 1.46, 1.88; P < 0.0001), and median survival time OR = 2.53 (95% CI 2.27, 2.82; P < 0.0001). After screening differential genes and co-expressed genes in tumor gene databases, we found that AC245595.1, ITGB1-DT and AL606489.1 may be involved in the process of lung cancer invasion, and macrophages M1 and M2, CD4+-Th1, CD8+-Th1 may participate in immune infiltration.

CONCLUSIONS

In patients with visceral pleural invasion of stage IIA-IIB lung cancer, chemotherapy has shown a significant effect on improving prognosis and enhancing efficacy. However, surgical treatment did not significantly improve the overall prognosis. Therefore, the individual situation of the patient and the comprehensive benefits of the treatment program should be fully considered when developing the treatment program.

Development and External Validation of a Nomogram for Predicting Cancer-Specific Survival of Non-Small Cell Lung Cancer Patients With Ipsilateral Pleural Dissemination

Background

Non-small-cell lung cancer (NSCLC) patients with ipsilateral pleural dissemination are defined as M1a in the eighth of American Joint Committee on Cancer (AJCC) TNM staging. We aimed to build a nomogram to predict lung cancer specific survival (LCSS) of NSCLC patients with ipsilateral pleural dissemination and to compare the impact of primary tumor resection (PTR) on LCSS among patients with different features.

Methods

A total of 3,918 NSCLC patients with ipsilateral pleural dissemination were identified from the Surveillance, Epidemiology, and End Results (SEER) database. We selected and integrated significant prognostic factors based on competing risk regression to build a nomogram. The model was subjected to internal validation within SEER cohort and external validation with the cohort of 97 patients from Peking University People’s Hospital.

Results

Age (P < 0.001), gender (P = 0.037), T stage (P = 0.002), N stage (P < 0.001), metastasis pattern (P = 0.005), chemotherapy (P < 0.001), and PTR (P < 0.001) were independent prognostic factors. The calibration curves presented a good consistency and the Harrell’s C-index of nomogram were 0.682 (95%CI: 0.673–0.691), 0.687 (95%CI: 0.670–0.704) and 0.667 (95%CI: 0.584–0.750) in training, internal, and external validation cohort, respectively. Interaction tests suggested a greater LCSS difference caused by PTR in patients without chemotherapy (P < 0.001).

Conclusions

We developed a nomogram based on competing risk regression to reliably predict prognosis of NSCLC patients with ipsilateral pleural dissemination and validated this nomogram in an external Chinese cohort. This novel nomogram might be a practical tool for clinicians to anticipate the 1-, 3- and 5-year LCSS for NSCLC patients with pleural dissemination. Subgroup analysis indicated that patients without chemotherapy could get more benefit from PTR. In order to assess the role of PTR in the management of M1a patients more accurately, further prospective study would be urgently required.

Surgical Resection of Primary Tumors Provides Survival Benefits for Lung Cancer Patients With Unexpected Pleural Dissemination

Background: Surgery is not generally recommended for non-small cell lung cancer (NSCLC) patients with malignant pleural dissemination (PD). However, in some cases, PD is found unexpectedly during surgery. There is no consensus on whether surgical intervention can provide survival benefit for them. We investigated the role of surgery in NSCLC patients with unexpected PD by a cohort study.

Methods: Clinical data of consecutive patients who intended to undergo radical surgery for NSCLC between January 2010 and December 2015 at Shanghai Chest Hospital and Huadong Hospital were collected from a lung cancer database. Patients diagnosed with unexpected malignant pleural nodules intraoperatively were enrolled in this retrospective study.

Results: A total of 181 NSCLC patients were diagnosed with unexpected malignant PD intraoperatively and confirmed with postoperatively histological examinations. Out of these, 80 (44.2%) patients received pleural nodule biopsies alone, and 101 (55.8%) received primary tumor resection (47 with sublobar resection and 54 with lobectomy). The median progression-free survival and overall survival for all patients were 13 and 41 months respectively. Patients in the resection group had significantly better progression-free survival (19.0 vs. 10.0 months, P < 0.0001) and overall survival (48.0 vs. 33.0 months, P < 0.0001) than patients in the biopsy group. In the resection group, there was no statistical difference between patients with sublobar resection and lobectomy (P = 0.34). Univariate and multivariate analyses identified primary tumor resection, targeted adjuvant therapy, and tumor size (≤ 3 cm) as independent prognostic factors.

Conclusions: NSCLC patients with unexpected intraoperative PD potentially benefited from surgical resection of the primary tumor and multidisciplinary targeted therapy, particularly when tumor size did not exceed 3 cm. Our data demonstrated that the resection type was not associated with survival differences, which remains to be defined with a larger sample size.

New horizons in non-small-cell lung cancer patients with ipsilateral pleural dissemination (M1a): review of the literature

Non-small cell lung cancer (NSCLC) with ipsilateral pleural dissemination (pM1a) is generally contraindicated for surgery owing to the extremely poor survival. However, some studies have demonstrated that primary tumor resection (PTR) may prolong the survival of these patients. Besides, with the development of systemic therapy, it is still hard to decide the best therapy model for pM1a patients. Thus, we reviewed essential studies about NSCLC with pleural disease and summarized the progress of new techniques in recent years, trying to provide promising new horizons about the management of pM1a patients. Firstly, we suggest performing PTR for highly selected pM1a patients, combined with appropriate systemic therapies and follow-up strategies. Secondly, hyperthermic intrathoracic chemotherapy (HITHOC) can control the symptoms and prolong the survival of NSCLC patients with malignant pleural effusion (MPE). It could also combine with PTR together. Finally, application of genetic testing and circulating tumor DNA (ctDNA) monitoring may furthermore make it possible for personalized management of pM1a patients in the future.

Is surgical resection of primary tumour superior to exploratory thoracotomy without resection in treating lung cancer patients with unexpected pleural metastasis detected during operation?

A best evidence topic in thoracic surgery was written according to a structured protocol. The question addressed was 'In lung cancer patients with unexpected pleural metastasis detected during operation, is surgical resection of primary tumour superior to exploratory thoracotomy without resection in improving long-term survival?'. Altogether, 1443 papers were found using the reported search, of which 1 meta-analysis and 10 retrospective observational cohort studies represented the best evidence to answer the clinical question. The authors, journal, date and country of publication, patient group studied, study type, relevant outcomes and results of these papers were tabulated. One meta-analysis and 9 cohort studies found that surgical resection of the primary tumour, on the discovery of pleural metastases, yielded a better overall survival than exploratory thoracotomy alone, while 1 cohort study showed no difference. Six studies found that main tumour resection was an independent favourable prognostic factor for overall survival in lung cancer patients with unexpected pleural metastasis detected during operation, while 3 cohort studies also showed improved progression-free survival over exploratory thoracotomy. Therefore, we conclude that surgical resection of the primary tumour is superior to exploratory thoracotomy in treating lung cancer patients with unexpected pleural metastasis detected during operation.

Primary tumour resection in non-small-cell lung cancer patients with ipsilateral pleural dissemination (M1a): a population-based study

OBJECTIVES

Non-small-cell lung cancer (NSCLC) patients with ipsilateral pleural dissemination (M1a) are generally contraindicated for surgery. However, several small-sample studies have demonstrated that they might benefit from surgery. We investigated the effects of primary tumour resection on survival in these patients.

METHODS

Stage IV NSCLC patients with ipsilateral pleural dissemination were identified from the US National Cancer Institute Surveillance, Epidemiology and End Results database entries from 2010 to 2015. Survival analysis was performed before and after matching. Multivariable regression models were built to identify prognostic factors.

RESULTS

Of the 5513 patients with ipsilateral pleural dissemination, 309 underwent primary tumour resection. In the entire cohort, surgery was associated with improved overall survival (OS) in both the unmatched and matched cohorts (both log rank, P < 0.001). In the surgery-recommended cohort, patients treated with surgery also had significantly longer OS before and after matching. Multivariable regression models showed that surgery was an independent favourable prognostic factor for OS [hazard ratio (HR) 0.56, 95% confidence interval (CI) 0.48-0.65; P < 0.001] and lung cancer-specific mortality (subhazard ratio 0.60, 95% CI 0.51-0.70; P < 0.001). Surgery was independently associated with improved survival in all subgroups except for those with pericardial effusion (P = 0.065) or N3 disease (P = 0.17). In the surgical cohort, patients who underwent lobe/bilobectomy had significantly better OS than those who underwent sublobar resection (log rank, P < 0.001).

CONCLUSIONS

Inclusion of primary tumour resection in multimodal therapy of NSCLC was associated with improved survival in selected patients with ipsilateral pleural dissemination, except for those with pericardial effusion or N3 disease.

Primary tumor resection of non-small cell lung cancer patients with ipsilateral pleural dissemination (M1a) in the era of targeted therapy

Background

Non‐small cell lung cancer (NSCLC) patients with ipsilateral pleural dissemination (M1a) are generally contraindicated for surgery. Recently, several studies have demonstrated that these patients might benefit from primary tumor resection (PTR). However, whether PTR is beneficial for driver oncogene‐positive patients treated with targeted therapy, remains unclear. Here, we investigated the effects of PTR on survival in the era of targeted therapy.

Methods

In total, 105 NSCLC patients with ipsilateral pleural dissemination were identified. The mode of systemic treatment was assessed in this study. Survival analysis was performed with the Kaplan‐Meier method and Cox proportional hazards regression. The overall survival (OS) of patients with or without PTR was compared between propensity score‐matched groups (caliper: 0.02).

Results

In the entire cohort, PTR was associated with improved OS in both unmatched (median survival time [MST]: 50.0 vs. 29.6 months, P = 0.019) and matched (MST: 50.0 vs. 34.4 months, P = 0.052) cohorts. Multivariate regression models showed that surgery was an independent favorable prognostic factor for OS. A total of 70 patients underwent genetic testing, and targeted therapies, such as EGFR‐TKIs or ALK‐TKIs, were used in the driver oncogene‐positive patients. Subgroup analysis showed that PTR did not improve OS in the targeted therapy group (MST: 57.1 months vs. 50.4 months, P = 0.840). However, surgery significantly prolonged survival in the nontargeted therapy group (MST: 39.8 vs. 14.2 months, P = 0.002).

Conclusions

The results of this study indicated that PTR could prolong OS in stage IV NSCLC patients with ipsilateral pleural dissemination, especially in patients who are not candidates for targeted therapy.

Key points

Non‐small cell lung cancer patients with ipsilateral pleural dissemination can benefit from primary tumor resection.

Primary tumor resection could prolong overall survival (OS) in non‐small cell lung cancer patients with ipsilateral pleural dissemination who are not candidates for targeted therapy.