NEW DATA ON HISTOGENESIS AND HISTOLOGICAL STRUCTURE OF LUNG CANCER

BACKGROUND

Lung cancer (LC) is one of the most common malignant neoplasms in men around the world, which poses a number of important challenges for scientists.

AIM

To analyze the histogenesis, features of the histological structure, and growth of LC.

MATERIALS AND METHODS

The surgical material of 81 patients with LC was studied. Histological preparations were stained with hematoxylin and eosin (H&E) using the Papanicolaou method. Immunohistochemical reactions with monoclonals (Ki67, PCNA) were conducted.

RESULTS

In histological preparations of all LC types (squamous, adenocarcinoma, and small cell), along with solid growth, tumor growth in the alveoli was determined, which started from the basal membrane and grew toward the alveolus center, as evidenced by the morphological features of growth, tumor spread, and development of necrosis in the center.

CONCLUSION

In all the studied histological preparations of LC, tumor growth in the alveoli is noted, which is confirmed by structural and cellular signs and the nature of tumor decay in the alveolus center, which corresponds to the general patterns of development of malignant epithelial tumors.

Immunohistochemical analysis of beta-defensin-2 expression in human lung tumors

AIM

The present research was directed on analysis of the expression patterns of human beta-defensin-2 (hBD-2) in human lung tumors.

MATERIALS AND METHODS

Specimens of surgically resected human lung tumors (n = 31) of different histological type (1 case of small cell lung cancer, and 30 cases of non-small cell lung cancer (1 case of clear cell carcinoma, 9 cases of squamous cell carcinoma (SCC), and 20 cases of adenocarcinoma (AC)) were analyzed for expression of hBD-2 with the use of immunohistochemical analysis.

RESULTS

Immunohistochemical analysis has revealed that all lung tumor samples independently on their histological type express hBD-2 peptide, however at different levels (from < 5% to 100% cells). According to our observations, low-differentiated AC differs from moderately differentiated AC by significantly lower hBD-2 expression levels (p < 0.05). No correlation between hBD-2 expression patterns and PCNA or Bcl-2 expression has been found.

CONCLUSION

Human beta-defensin-2 expression levels may depend on differentiation grade of lung adenocarcinoma.

Expression of human beta-defensins-1, 2 and 4 mRNA in human lung tumor tissue: a pilot study

AIM

To analyze the patterns of human beta-defensin-1, 2, 4 (hBDs) expression in human lung tumors.

MATERIALS AND METHODS

Tissue samples of surgically resected human lung tumors (squamous cell carcinoma (SCC), n=10; adenocarcinoma (AC), n=10) paired with conditionally normal tissue samples were analyzed for expression of hBD-1, 2, 4 mRNA by semiquantitative RT-PCR.

RESULTS

In a number of studied lung cancer tissue samples, overexpression of defensin mRNA was registered: hBD-1 mRNA (50% of SCC and 60% AC), hBD-2 mRNA (60% of SCC and 50% of AC) or hBD-4 (40% of SCC and 20% AC). No correlation was detected between the levels of hBD-1, hBD-2 and hBD-4 mRNA and histological type, differentiation grade of the tumor, and the stage of the disease, as well as the content of hBD-2 peptide in blood serum of lung cancer patients.

CONCLUSION

Human beta-defensins-1 and -2 are often up-regulated in human lung tumors.