Purpose: The aim of this study was to investigate the changes of CD3 and CD20 in the
microenvironment of rabbit peripheral lung cancer before and after microwave ablation (MA).
Methods: Twenty-four rabbits with lung VX2 tumor were randomly divided into four groups (n =
6 in each group). Ultrasound-guided MA was gone using 40 W powers as the treatment mode for
about 60s. The animals were sacrificed by injecting anesthetic into the ear vein before and after
MA. The thoracic ribs were cut off and the lung lobes were removed completely with tumor and
then washed with saline. Part of the organization placed into 4% formaldehyde for pathological examination;
part placed into 2.5% glutaraldehyde for the electron microscopy.
Result: The histological features of ablation lesions showed as morphological abnormalities of tumor
cells, cell and nuclear elongated by heat; the cells of alveolar wall degeneration and necrosis.
The alveolar wall ruptured and alveolar structure disappeared. Blood cells and inflammatory cells
appeared in the alveolar interstitial and a large number of serous exudated. The positive cell numbers
of CD3 and CD20 cells at 2 weeks after MA were significantly different from those before
MA and at 3 days and 1 week after MA (P< 0.01). There was no significant difference in the positive
cells of CD3 and CD20 before and 3 days and 1 week after MA.
Conclusion: The number of immune cells in tumor adjacent tissue increased significantly after MA
and the level of local anti-tumor immune cells was also increased.