[Surgery for synchronous primary lung cancers and intrapulmonary metastases]

Area of Science:

• Thoracic Surgery
• Surgical Oncology
• Pulmonology

Background:

• Lung cancer management involves complex cases, including multiple primary tumors and intrapulmonary metastases.
• Distinguishing between synchronous primary lung cancer and intrapulmonary metastases is critical for treatment planning and prognosis.

Purpose of the Study:

• To compare the survival rates of patients with synchronous primary lung cancer versus those with intrapulmonary metastases.
• To analyze prognostic factors, including tumor location and histology, in patients with multiple lung lesions.

Main Methods:

• Retrospective analysis of 1,040 patients with primary lung cancer undergoing pulmonary resection.
• Categorization of patients into synchronous primary lung cancer (Group A) and intrapulmonary metastases (Group B).
• Comparison of 5-year and 10-year survival rates and analysis of prognostic factors.

Main Results:

• Group A (synchronous primary lung cancer) demonstrated significantly better 5-year (64%) and 10-year (56%) survival rates than Group B (intrapulmonary metastases) (37% and 32%, respectively).
• In Group A, tumors in different lobes (80% 5-year survival) and different histology (73% 5-year survival) showed better outcomes than those in the same lobe or same histology.
• Survival rates varied significantly by disease stage, with Stage I having 65% 5-year survival and Stage IV having 25%.

Conclusions:

• Synchronous primary lung cancer generally carries a better prognosis than primary lung cancer with intrapulmonary metastases.
• Tumor location and histology influence survival in synchronous primary lung cancer.
• Histological differentiation between multiple primary lung cancers and intrapulmonary metastases remains challenging and requires further research.