The objective of study was to establish an animal model with thymic lymphoma in mice induced by intraperitoneal injection of DNA alkylating agent N-methyl-N-nitrosourea (MNU). Male and female mice of the C57BL/6 strain were injected by the intraperitoneal route with MNU solution in a dosage of 50 mg/kg body weight. The injection was repeated at week 8. Following injection of MNU, the general status of mice was observed. All mice were sacrificed for autopsy at the 22nd experimental week. Complete gross examination was performed for detection of tumor masses. The results showed that at the 22nd week, the incidence of thymic lymphoma in MNU-treated animals was 67.5% (27/40). No significant sex difference in the incidence of thymic lymphoma was observed. In conclusions, an animal model with thymic lymphoma in mice can be established by twice intraperitoneal administration of MNU. The biological behavior of the induced tumors resembles to those of human thymic lymphoma derived from thymic T-cells.
Animals ; Female ; Lymphoma ; chemically induced ; Male ; Methylnitrosourea ; adverse effects ; analogs & derivatives ; Mice ; Mice, Inbred C57BL ; Neoplasms, Experimental ; chemically induced ; Thymus Neoplasms ; chemically induced ; Trimethylsilyl Compounds ; adverse effects

The objective of this study was to elevate the tumorigenic rate of animal model with thymic lymphoma induced by N-methyl-N-nitrosourea (MNU) and to reduce the mortality of this mouse model. The injection regimen and experimental cycle were improved on the basis of previous experiments. The male and female C57BL/6 mice were injected by the intraperitoneal route with MNU solution at different dosages in the first week and the 4th week respectively. Following injection of MNU, the general features of the mice were observed. All mice were sacrificed for autopsy before the 24th experimental week. Complete gross examination was performed for detection of tumor masses. The pathologic and immunohistochemical methods were used to identify the origin and subtype classification of the neoplasm. The results showed that at the 25th week the incidence of thymic lymphoma in mice injected with MNU was 83.3% (55/66), the mortality was 7.6%. In conclusion, improving the program and changing the experimental cycle can increase the tumorigenic rate in the mouse model induced by MNU from 67.5% to 83.3% and reduce the mortality from 10% to 7.6%.
Animals ; Female ; Lymphoma ; chemically induced ; Male ; Methylnitrosourea ; adverse effects ; Mice ; Mice, Inbred C57BL ; Neoplasms, Experimental ; chemically induced ; Thymus Neoplasms ; chemically induced

OBJECTIVETo explore the significance of C4d deposition in follicular lymphoma (FL).

METHODSThe deposition of C4d was detected in samples from 133 cases of lymphoma by immunohistochemistry and FL was studied by the double stainings of CD35/C4d, CD21/C4d and Bcl-2/C4d,respectively.

RESULTSAmong the 26 FL tissues, irregular C4d deposition was seen in 19 tumor tissues. Double staining for CD35, CD21 or Bcl-2 showed the C4d deposition was around the follicular dendritic cells (FDC). There was no significant difference between the positive rate of C4d and the degree of lymphoma. No deposition was found in the diffuse areas of FL and other type lymphomas.

CONCLUSIONC4d deposition around the follicular dendritic cell in the neoplastic follicles is a specific indicator of follicular lymphoma.

Adolescent ; Adult ; Aged ; Aged, 80 and over ; Complement C4b ; immunology ; Female ; Humans ; Immunohistochemistry ; Lymphoma, Follicular ; immunology ; pathology ; Male ; Middle Aged ; Peptide Fragments ; immunology

The objective of study was to investigate the origin and to classify the subtype of N-methyl-N-nitrosourea (MNU)-induced thymic lymphomas in mice. Histopathologic, immunohistochemical and ultrastructural studies were performed to analyze the pathological features of the neoplasms. The results showed that the thymus in all cases became totally replaced by sheets of cells of the lymphoid series. All the tumors coexpressed CD3 and TdT. Transmission electron microscopic study showed the plasma membranes of malignant lymphoma cells were smooth. The nuclear profiles were usually regular, with varying percentage of convoluted nuclei. Few cell organoids were observed in cytoplasm. In conclusion, all the MNU-induced tumor classified by histopathologic, immunohistochemical and ultrastructural studies as precursor lymphoblastic lymphoma that were unquestionably related to the thymus origin and T-cell lineage.
Animals ; Female ; Lymphoma ; chemically induced ; pathology ; ultrastructure ; Male ; Methylnitrosourea ; adverse effects ; Mice ; Mice, Inbred C57BL ; Thymus Gland ; pathology ; ultrastructure ; Thymus Neoplasms ; chemically induced ; pathology ; ultrastructure

Adolescent ; Adult ; Aged ; Child ; Child, Preschool ; Female ; HIV Infections ; physiopathology ; Humans ; Liver Diseases ; physiopathology ; virology ; Male ; Middle Aged ; Risk Factors ; Young Adult

Purpose To investigate the value of application of D2-40/CD34-CK cocktail antibodies by double immunohistochemical staining for assessment of lymphovascular invasion (LVI) and to determine its prognostic significance in colorectal cancer with insufficient lymph node harvest. Methods Specimens from 133 cases of colorectal cancer with less than 12 lymph nodes were selected. HE staining and double immunohistochemical staining of the cocktail antibodies were performed to compare the difference of the two methods in screening for LVI. The The relationship between LVI confirmed by cocktail antibody immunohistochemical staining and clinicopathological characteristics and overall survival (OS) of patients was analyzed. Results (1) The detection rates of cocktail antibody double immunohistochemical staining and HE staining for LVI were 42.9％ (57/133) and 21.8％ (29/133) with statistically significant difference (P < 0.001). (2) The presence of LVI confirmed by double staining was significantly associated with Dukes staging, depth of invasion, clinical stages, lymph node metastasis and tumor budding (P < 0.05). (3) The presence of LVI, the location and extent of LVI, and the number of tumor cells in thrombus ≥5.5 for cases with LVI ≤2 clusters, were significantly associated with OS (P < 0.05). Conclusion D2-40/CD34-CK cocktail antibodies double staining is superior to routine HE staining in assessing LVI. LVI is intimately associated with tumor stage, lymph nodes metastasis and tumor budding, and it is an independent prognostic factor for CRC patients. It should be a supplementary examination for these patients with insufficient lymph node harvest.

Objective: To analyze density of stromal tumor-infiltrating lymphocytes (sTIL) and expression of lymphocyte-activation gene-3 (LAG-3) protein in advanced gastric adenocarcinomas, and to investigate the correlation of sTIL and LAG-3 with the prognosis in patients with advanced gastric adenocarcinoma. Methods: The clinicopathological characteristics and follow-up data of 260 patients with advanced gastric adenocarcinoma were collected at Fujian Cancer Hospital, from January 2011 to December 2014. The percentage of sTILs was reported semi-quantitatively using histological section evaluation, the LAG-3 protein was detected using immunohistochemistry, and the expression was correlated with the clinicopathological features and patient outcomes. Results: Among the 260 cases, high density of sTIL was detected in 173 cases (66.5%) while LAG-3 high expression was observed in 160 cases (61.5%). These cases were divided into four groups. Group Ⅰ: 48 cases (18.5%) were sTIL low/LAG-3 low; group Ⅱ: 52 cases (20.0%) were sTIL high/LAG-3 low; group Ⅲ: 39 cases (15.0%) were sTIL low/LAG-3 high; group Ⅳ: 121 cases (46.5%) were sTIL high/LAG-3 high. Kaplan-Meier survival analyses showed that patient prognoses were related to age, tumor size, tumor location, Lauren classification, perineural invasion, vascular invasion, TNM staging, postoperative adjuvant chemotherapy and molecular classification (P<0.05). Meanwhile, higher densities of sTIL and higher expression of LAG-3 were associated with better prognosis. Multivariate survival analysis showed age, tumor size, Lauren classification and postoperative adjuvant chemotherapy were independent prognostic factors for patient survival. The results showed a poor prognosis in low-sTIL/low-LAG-3 patients. Conclusions: Compared with low density of sTIL and low expression of LAG-3, high density of sTIL and high expression of LAG-3 are associated with better outcomes in patients with advanced gastric adenocarcinoma, respectively. Combined detecton of sTIL and LAG-3 may be more useful in gastric cancer than using either alone. Age, tumor size, Lauren classification and postoperative adjuvant chemotherapy are independent prognostic factors for patients with advanced gastric adenocarcinoma.
Adenocarcinoma/pathology* ; Humans ; Immunohistochemistry ; Lymphocytes, Tumor-Infiltrating/metabolism* ; Neoplasm Staging ; Prognosis ; Retrospective Studies ; Stomach Neoplasms/pathology*