No abstract available.
Neoplasm Micrometastasis* ; Stomach Neoplasms*

No abstract available.
Bone Marrow* ; Breast Neoplasms* ; Breast* ; Neoplasm Micrometastasis*

Recently, lymph node micrometastasis has been evaluated for its prognostic value in gastric cancer. Lymph node micrometastasis cannot be detected via a usual pathologic examination, but it can be detected by using some other techniques including immunohistochemistry and reverse transcription-polymerase chain reaction assay. With the development of such diagnostic techniques, the detection rate of lymph node micrometastasis is constantly increasing. Although the prognostic value of lymph node micrometastasis remains debatable, its clinical impact is apparently remarkable in both early and advanced gastric cancer. At present, studies on the prognostic value of lymph node micrometastasis are evolving to overcome its current limitations and extend the scope of its application.
Immunohistochemistry ; Lymph Nodes* ; Neoplasm Micrometastasis* ; Stomach Neoplasms*

There have been some controversies on prognostic significance of lymph node (LN) micrometastasis (MM) in advanced gastric carcinomas (AGCs). The present study aimed at 1) determination of prognostic significance of MM, 2) evaluation of the relationship between MM and clinicopathological parameters, and 3) determination of LN group where MMs were frequently found. We studied 70 cases of AGC without LN metastasis on initial examination. The tumors were examined for location, size, depth of invasion, differentiation, histologic type, lymphatic invasion, and c-erbB-2 expression. To evaluate MM, pancytokeratin immunohistochemistry was performed in all LNs from 70 cases of AGCs. Among 2,203 dissected LNs from 70 patients, 37 (1.6%) LNs from 19 (27.1%) patients revealed MM. Micrometastases were seen in only group 1 and 2 LNs: none had group 3 and 4 LN involvement. The gender, age, tumor size, location of tumor, histologic type, differentiation, depth of invasion, lymphatic invasion, and c-erbB-2 expression were not significantly associated with MM status. The survival time of the MM-positive group (mean: 62 months) was significantly shorter than that of the MM-negative group (mean: 72 months) (p=0.046). The findings of this study indicate that the presence of MM in LNs is an important prognostic factor in AGC patients.
Humans ; Immunohistochemistry ; Keratins ; Lymph Nodes* ; Neoplasm Metastasis ; Neoplasm Micrometastasis*

Gastric cancer is the most prevalent cancer in Korea and comprises the second cause of cancer death. Surgery only can provide chance of cure, but most locally advanced cancers recur after a curative resection, even though important advances in the surgical and nonsurgical treatments of gastric cancer have taken place. Preoperative chemotherapy theoretically can provide the advantages of reducing the bulk of tumor, which might improve the R0 resection rate, and of treating micrometastases early. Also, preoperative chemotherapy is expected to render unresectable tumors resectable without increasing postoperative morbidity and mortality. There are many new chemotherapeutic agents available for the treatment of advanced gastric cancer, but still the most effective agent, the optimal time and number of cycle for administration are still not known. The addition of postoperative chemotherapy through an intraperitoneal route and/or radiotherapy might affect the outcome of surgery favorably, but that hasn't been proved yet. A multicenter prospective randomized phase III trial should be performed to answer for those questions and to improve the curability of gastric cancer treatment.
Drug Therapy* ; Korea ; Mortality ; Neoplasm Micrometastasis ; Radiotherapy ; Stomach Neoplasms*

The current TNM staging including N staging has been suggested as a gold standard for the appropriate therapy in the well differentiated thyroid cancer patients. N staging was established based on histopathologic findings, however, the newly suggested prognostic factors for the revision of N staging include some clinicopathologic factors, such as clinical metastasis (macrometastasis), large node metastasis (> or =3 cm), extranodal extension and the number of metastatic node. Recently, American Thyroid Association reported the possibility that the low-risk group patients would be overestimated as high-risk group patients that leads to the overtreatment, the following unnecessary complication and the economic cost. The preexisting N1a/N1b classification by anatomical location of metastatic node still remains as a strong prognostic factor; however, many evidences indicated that the clinicopathologic factors described above should be considered in the risk stratification in the near future. Thus, it needs to be stressed that the four factors of micrometastasis, large node metastasis (> or =3 cm), gross or microscopic extranodal extension and multiple metastatic node (>5 cm) have been established as negative or positive prognostic factors and should be noted in clinical practice.
Humans ; Neoplasm Metastasis ; Neoplasm Micrometastasis ; Neoplasm Staging ; Thyroid Gland ; Thyroid Neoplasms

PURPOSE: Lymph node metastasis is the most important prognostic factor in colorectal cancer. However, 20~30% of patients with lymph node negative colorectal cancer die of recurrent disease. We investigated whether the detection of micrometastasis is of any clinical significance in Dukes' stage A & B colorectal cancer. METHODS: Ninety patients who underwent curative resection of colorectal cancer from Aug. of 1996 to Jan. of 1999 were entered the study. For examination, we used paraffin blocks of lymph nodes which were metastasis-free by conventional histopathology. After preparation of tissue blocks using the serial sectioning technique, the specimens were stained with immunohistochemical method using anticytokeratin antibody. And the hematoxylin-eosin staining was repeated. RESULTS: We disclosed micrometastases in 15 of 90 cases, mostly located in subcapsular sinuses. And in 8 of 15 cases, we also found metastases in repeated H&E staining. There were no significant relationship between the detection of micrometastases and the depth of wall invasion, the histological grade and the status of lymphovascular invasion. With median follow-up of 15 months, we found no significant difference in recurrence between the micrometasis positive and negative groups. CONCLUSIONS: The result showed that the micrometastasis of lymph node in colorectal caner might increase the risk for development of tumor recurrence. But because of small numbers of recurrent cases and relatively short follow-up period, there was no statistically significant relationship between micrometastasis negative and positive groups.
Colorectal Neoplasms* ; Follow-Up Studies ; Humans ; Immunohistochemistry ; Keratins ; Lymph Nodes* ; Neoplasm Metastasis ; Neoplasm Micrometastasis* ; Paraffin ; Recurrence

This review discusses the production of alpha-particle-emitting radionuclides in radioimmunotherapy. Radioimmunotherapy labeled with alpha-particle is expected to be very useful for the treatment of monocellular cancer (e.g. leukemia) and micrometastasis at an early stage, residual tumor remained in tissues after chemotherapy and tumor resection, due to the high linear energy transfer (LET) and the short path length in biological tissue of alpha particle. Despite of the expected effectiveness of alpha-particle in radioimmunotherapy, its clinical research has not been activated by the several reasons, shortage of a suitable a-particle development and a reliable radionuclide production and supply system, appropriate antibody and chelator development. Among them, the establishment of radionuclide development and supply system is a key factor to make an alpha-immunotherapy more popular in clinical trial. Alpha-emitter can be produced by several methods, natural radionuclides, reactor irradiation, cyclotron irradiation, generator system and elution. Due to the sharply increasing demand of 213Bi, which is a most promising radionuclide in radioimmunotherapy and now has been produced with reactor, the cyclotron production system should be developed urgently to meet the demand.
Alpha Particles ; Cyclotrons ; Drug Therapy ; Linear Energy Transfer ; Neoplasm Micrometastasis ; Neoplasm, Residual ; Radioimmunotherapy* ; Radioisotopes*

PURPOSE: Whereas lymph node metastasis in gastric cancer is an important prognostic factor, the prognostic relevance of occult tumor cells in lymph nodes has not yet been elucidated. The aims of this study were to assess the incidence of micrometastases of lymph nodes in patients with submucosally invaded gastric cancer and to investigate whether micrometastases of lymph nodes have prognostic significance. METHODS: In order to evaluate the incidence of lymph node micrometastases in patients with submucosal gastric cancer, 1423 lymph nodes taken from 55 patients were assessed by immunohistochemical technique using a monoclonal anti-human cytokeratin-8. Clinicopathologic parameters and prognoses were compared between patients with and without micrometastases. RESULTS: The incidence of nodal involvement by tumor cells in 55 patients with submucosal gastric cancer increased from 20.0% (11 patients) by hematoxylin-eosin (H-E) staining to 30.8% (17 patients) by immunohistochemical staining. Nodal positivity in this study increased from 0.8% (12/1423 nodes) by H-E staining to 3.2% (45/1423 nodes) by immunohistochemical staining (p=0.003). The presence of cytokeratin positivity was not related to various clinicopathologic factors. As estimated by the Kaplan-Meier lifetable methods, there was no significant difference in the five-year survival rate between the micrometastases negative and positive groups (94.8% and 94.1%, respectively). CONCLUSION: The presence of nodal micrometastases detected by immunohistochemical technique is an interesting phenomenon, however clinically it seems to be of only weak prognostic value in submucosal gastric cancer.
Humans ; Incidence* ; Keratin-8 ; Keratins ; Lymph Nodes* ; Neoplasm Metastasis ; Neoplasm Micrometastasis* ; Prognosis ; Stomach Neoplasms* ; Survival Rate

PURPOSE: Sentinel lymph node (SLN) biopsy is thought to be a highly accurate method of assessing axillary nodal status in breast cancer. Furthermore, it can improve axillary staging by providing a more detailed examination of selected lymph nodes with a high probability of metastasis rather than the entire axillary nodes. The purpose of this study was to assess the incidence of SLN micrometastasis in node-negative breast cancer. METHODS: SLN biopsy was performed in 40 patients with clinically node-negative breast cancer using vital blue dye and/or radioisotope methods; the blue dye method was used in 21 cases, the isotope method in 14 cases, and a combination of both methods in 5 cases. All lymph nodes were evaluated by routine pathologic examination, and a more detailed examination was performed on sentinel nodes in node-negative cases; sentinel nodes were serially sectioned at an interval of 40micrometer depth followed by H&E and cytokeratin immunohistochemical (IHC) staining. RESULTS: Sentinel nodes were detected in 35 of 40 patients (87.5%). The mapping technique used in the remaining 5 cases was vital blue dye method only. Axillary node metastasis was found in 16 of 40 patients. Sentinel node biopsy accurately reflected the axillary node status in all cases; the sensitivity, specificity, and overall accuracy were 100, 100 and 100%, respectively. In 11 of 16 node-positive patients (68.8%), sentinel nodes were the only metastatic nodes. Occult micrometastases were found in SLN by serial section and IHC staining in 4 of 19 patients diagnosed as node- negative by routine pathological examination (21.1%). Occult micrometastasis of SLN was not correlated with primary tumor size, histologic grade or lymphovascular invasion with the exception of the S-phase fraction (P=0.023). CONCLUSION: SLN biopsy was a highly accurate method of assessing axillary node metastasis in breast cancer. Serial sectioning and IHC staining of SLN were sensitive methods in the detection of occult lymph node metastasis.
Biopsy ; Breast Neoplasms* ; Breast* ; Humans ; Incidence ; Keratins ; Lymph Nodes* ; Neoplasm Metastasis ; Neoplasm Micrometastasis* ; Sensitivity and Specificity