New technique opens route to previously unreachable lung tumors

Researchers at The University of Osaka have engineered a novel technique, Balloon-Assisted Bronchoscope Delivery (BDBD), to guide endoscopes to small, early-stage lung cancers hidden deep within the periphery of the lungs. By using a small balloon to gently widen the airways, this method overcomes the physical limitations of conventional bronchoscopy, promising to revolutionize both the accuracy of early diagnosis and the potential for minimally invasive treatment. 

The researchers present the technique in the journal Thorax. 

Lung cancer is a leading cause of cancer mortality worldwide. While CT scans have improved the detection of small, suspicious lesions in the peripheral lung fields, obtaining a definitive diagnosis requires a tissue biopsy. However, the bronchi—the airways of the lung—become progressively narrower and more complex toward the periphery, making it physically impossible for conventional bronchoscopes to reach these remote targets. Clinicians were often forced to stop several centimeters away, limiting the precision of biopsies and subsequent treatment. 

Instead of pursuing thinner endoscopes, the research team adopted a paradigm-shifting approach: widening the airway to create a path. The BDBD method involves advancing a thin catheter with a small balloon to the point where the bronchial pathway narrows. The balloon is gently inflated, dilating the bronchus and allowing the bronchoscope to be advanced further toward the lesion. In a first-in-human clinical trial, the team successfully demonstrated that this technique is both safe and effective, enabling access to lesions smaller than 20 mm. 

The BDBD technique offers a major breakthrough by enabling access to the peripheral lung field with minimal burden on the patient through the use of a simple balloon catheter. This enhanced accessibility is expected to dramatically improve the diagnostic accuracy for early-stage lung cancer, allowing for earlier and more effective intervention. Furthermore, it paves the way for future endoscopic therapies, where tumors can be treated in a minimally invasive manner without the need for major surgery. 

"BDBD is a homegrown Japanese technology developed through industry-academia collaboration," says Professor Atsushi Kumanogoh. "Our study has demonstrated its utility and safety. By allowing us to reach deep into the lungs where we couldn't before, we expect to significantly expand the options for early diagnosis and minimally invasive treatment of lung cancer." 

Source: University of Osaka 

18.11.2025

• endoscopy (162)
• lung (232)
• lung cancer (164)
• minimal invasive (198)
• thorax (70)