Decrease in intrahepatic CD56+ lymphocytes in gastric and colorectal cancer patients with liver metastases.
Maya Gulubova1, Irena Manolova, Dobroslav Kyurkchiev
1Department of General and Clinical Pathology, Medical Faculty, Thracian University, Stara Zagora, Bulgaria.
Summary
Liver metastasis from gastric and colorectal cancer is linked to fewer intrahepatic CD3(+)CD56(+) and CD3(-)CD56(+) lymphocytes. This depletion of immune cells may promote cancer spread and immune evasion in the liver.
Area of Science:
- Immunology
- Oncology
- Hepatology
Background:
- Intrahepatic lymphocytes play a crucial role in liver immunity.
- Cancer metastasis to the liver can alter the local immune microenvironment.
- Understanding lymphocyte dynamics is key to deciphering liver immune control in cancer.
Purpose of the Study:
- To investigate the proportions of key intrahepatic lymphocyte subsets in patients with gastric and colorectal cancer.
- To compare lymphocyte populations in livers with and without metastasis.
- To evaluate the relationship between lymphocyte infiltration and liver metastasis progression.
Main Methods:
- Two-color flow cytometry was used to quantify lymphocyte subpopulations (CD3(+), CD3(+)CD56(+), CD56(+), CD4(+), CD8(+)) in hepatic mononuclear cells.
- Immunohistochemistry assessed the distribution of CD4(+), CD8(+), and CD56(+) cells in metastatic and adjacent liver tissues.
- Analysis included 34 patients with gastric or colorectal cancer, with and without liver metastases.
Main Results:
- A significant decrease in CD3(+)CD56(+) (NKT-like) and CD3(-)CD56(+) (NK) cells was observed in metastatic livers compared to non-metastatic livers.
- Immunohistochemistry showed reduced CD56(+) cell numbers in metastatic tissue.
- Tumor-infiltrating lymphocyte prevalence was lower in multiple metastases than in solitary metastases.
Conclusions:
- The reduction in specific intrahepatic lymphocyte populations correlates with liver metastasis progression in gastric and colorectal cancer.
- Depletion of hepatic innate lymphocytes may increase susceptibility to liver metastasis.
- This immune cell imbalance could facilitate metastatic cell escape from liver immune surveillance.