Epithelioid sarcoma arising on the forearm of a 6-year-old boy: case report and review of the literature

Epithelioid sarcoma is a rare malignant tumor that occurs mainly in young adults and most frequently involves the distal portion of the upper extremities. The tumor is particularly rare in children and more frequently involves the head and neck; only one case involving the forearm has been reported in a child under 10 years of age, and he was treated with amputation. We report the case of a 6-year-old boy with an epithelioid sarcoma of the forearm whose initial management had been inappropriate. The patient was ultimately treated with limb sparing surgery. Two years later, no local recurrence was evident but pleural metastases were detected.

RhoC is essential for TGF-beta1-induced invasive capacity of rat ascites hepatoma cells

Transforming growth factor-beta1 (TGF-beta1) is a multifunctional growth factor that plays a role in cell proliferation, differentiation, extracellular matrix production, apoptosis, and cell motility. We show here that TGF-beta1 increased the invasiveness of MM1 cells, which are a highly invasive clone of rat ascites hepatoma cells. Both mRNA and protein levels of RhoC but not RhoA in TGF-beta1-treated MM1 cells increased. In parallel with this increase in expression, RhoC activity was induced by TGF-beta1 treatment. When RhoC was overexpressed in MM1 cells, the invasive capacity increased. The RhoC-overexpressing cells formed more nodules than did mock cells when injected into rat peritoneum. Furthermore, when RhoC expression was reduced by transfection with shRNA/RhoC, the invasiveness of MM1 cells decreased with concomitant suppression of RhoC expression. Thus, the induced expression of RhoC by TGF-beta1 in MM1 cells plays a critical role in TGF-beta1-induced cell migration.

Overexpression of p16 INK4a as an indicator for human papillomavirus oncogenic activity in cervical squamous neoplasia

Overexpression of p16(INK4a) has been observed when retinoblastoma protein is inactivated by high-risk human papillomavirus (HPV) oncoprotein E7. We investigated overexpression of p16(INK4a) and HPV infection in cervical squamous neoplasia to evaluate the oncogenic potential among various HPV subtypes. The high-risk HPV was detected by PCR in 69.8% (37/53), 97.5% (39/40), 91.7% (44/48), and 100% (16/16) of cervical intraepithelial neoplasia (CIN)1, CIN2, CIN3, and squamous cell carcinoma (SCC), respectively. The p16(INK4a) overexpression was investigated immunohistochemically using a p16(INK4a)-specific monoclonal antibody (clone E6H4). In high-risk HPV positive cases, 32.4% (12/37) of CIN1, 82.1% (32/39) of CIN2, 93.2% (41/44) of CIN3, and all (16/16) SCC showed p16(INK4a) overexpression. The incidence of p16(INK4a) overexpression was significantly different between CIN1 and CIN2, suggesting that the disorder of cell cycle regulation by HPV frequently occurred from CIN2. As for CIN1 cases, p16(INK4a) overexpression was observed more frequently in HPV16 and HPV52 than in HPV51 and HPV35. Using p16(INK4a) as a bio marker of HPV oncogenic activity, we demonstrate that the level of pRb dysfunction by high-risk HPV varied from subtypes and was getting more frequent from CIN2.

Alterations of p53, cyclin D1 and pRB expression in the carcinogenesis of esophageal squamous cell carcinoma

Many molecular alterations occur in esophageal carcinogenesis; however, little is known about the molecular genetic events responsible for the development of carcinoma. We investigated the expression of ki67, p53, cyclin D1 and pRB in 105 biopsy specimens using immunohistochemistry from iodine unstained lesions as indicators of carcinogenesis of the esophagus. Also, the genetic alternation of esophageal dysplasia from patients with accompanying esophageal squamous cell carcinoma (ESCC) was examined to study the evidence for field carcinogenesis in the esophagus. The expression of p53, cyclin D1 and pRB was detected in 31, 0 and 51.7% respectively of mild dysplasia; 40, 0 and 70% of moderate dysplasia; 40, 20 and 70% of severe dysplasia; and 48, 32 and 80% of carcinoma specimens. p53 expression was significantly increased in mild dysplasia, whereas cyclin D1 and pRB expression were significantly increased in carcinoma as compared to both normal epithelium and esophagitis. The ki67 LI and the rate of p53 expression were significantly higher in dysplasia with ESCC than in dysplasia without ESCC. Ki67, p53, cyclin D1 and pRB expression may be useful biomarkers for assessing the risk of developing esophageal cancer. Dysplasia observed at screening for secondary lesions has a highly malignant potential and careful follow-up studies are required.

8-1A, a human monoclonal antibody that reacts with intact human chorionic gonadotropin

The incidence of choriocarcinoma has decreased over time and therapeutic results have improved about 90% complete remission in patients without extensive metastasis. However, some choriocarcinomas metastasize to other organs and show resistance to chemotherapy, having a poor prognosis despite multidisciplinary treatment. Better methods of early diagnosis for recurrence or micrometastasis, and treatment against cases with intractable gestational trophoblastic neoplasia (GTN) are needed to improve the prognosis. Human chorionic gonadotropin (hCG) is a glycoprotein hormone composed of two dissimilar subunits and a tumor marker to make a diagnosis and monitor therapeutic effect in GTN. Even when hCG levels in the serum become too low to measure with the hCG beta-CTP system which is the most sensitive assay, there are estimated to be approximately 10,000 trophoblastic cells in the body. Residual trophoblast cells may cause symptoms such as bleeding or undergo malignant transformation to choriocarcinoma. Since most monoclonal antibodies developed so far are murine, administration creates human anti-mouse antibodies, resulting in clinical failure. More recent mouse/human chimeric antibodies or humanized antibodies still possess substantial immunogenicity that makes repeated administration difficult. In the present study, KM mice that can produce completely human monoclonal antibodies were used to prepare hCG-specific human monoclonal antibody. This yielded 8-1A, a human monoclonal antibody capable of reacting with intact hCG. In the future, new diagnostic techniques and treatments for chorionic diseases may be developed using this kind of human monoclonal antibody.

Insulin sensitivity independently influences brachial-ankle pulse-wave velocity in non-diabetic subjects

AIMS

Measurement of pulse-wave velocity (PWV) is a non-invasive technique for assessing arterial stiffness. Although insulin resistance is associated with intimal-medial thickness of the carotid artery evaluated by B-mode ultrasonography, it is not known whether it is related to PWV. The aim of this study was to determine the relationship between homeostasis model assessment insulin sensitivity index (HOMA-%S) and PWV in non-diabetic subjects. We also examined the effects of oral glucose tolerance test (OGTT) 2-h glucose and plasma high-sensitivity C-reactive protein (CRP) on PWV, as these two parameters are associated with atherosclerosis.

METHODS

A 75-g oral glucose tolerance test was performed in 1934 Japanese subjects who were undergoing health examinations. Of these subjects, we recruited 1541 non-diabetic subjects without chronic or acute inflammation, malignant diseases, autoimmune disorders, elevated serum creatinine levels, and abnormal hepatic function tests. Subjects who had an abnormal ankle/brachial blood pressure index of less than 0.9 were also excluded. Brachial-ankle PWV and plasma high-sensitivity CRP were measured on 1541 subjects who satisfied the admission criteria.

RESULTS

PWV was 12.55+/-1.61 (mean+/-sd) m/s and plasma CRP concentration was 0.4 mg/l (median, range, 0.1-5.8 mg/l) in the study subjects. By multivariate regression analysis, HOMA-%S was found to be an independent negative risk factor for PWV, while systolic blood pressure, age and triglycerides were positively associated with PWV. OGTT 2-h glucose was weakly and independently related to PWV in male subjects. Plasma CRP was not independently associated with PWV.

CONCLUSIONS

Insulin resistance is independently associated with PWV in non-diabetic subjects.

Bilateral multiple malignant transformation of Ollier's disease

We treated a 26-year-old man with a 19-year history of Ollier's disease. Secondary chondrosarcomas developed metachronously at four separate locations: both femora, left proximal tibia and fibular head. All four lesions were surgically excised, and each specimen was histologically identified as grade 1 or 2 chondrosarcoma. Clinical follow-up for 20 years beginning at the time of first tumor surgery has shown no evidence of local recurrence or metastasis. This is the first report of multiple bilateral metachronous malignant transformation of multiple chondromatoses in a patient with Ollier's disease.

Suppression of PI3K/mTOR pathway rescues LLC cells from cell death induced by hypoxia

Cancer cells in solid tumors are challenged by various microenvironmental stresses, including hypoxia, and cancer cells in hypoxic regions are resistant to current cancer therapies. To investigate the mechanism of resistance to hypoxia in cancer cells, we examined mouse Lewis lung carcinoma (LLC) cells, which died due to necrosis at high density under hypoxic but not under normoxic conditions. Levels of mammalian target of rapamycin (mTOR), a central regulator of cellular energy, are reported to be suppressed in hypoxia. We found that phosphorylation of two molecules downstream to it, ribosomal p70 S6 kinase (S6K) and ribosomal protein S6, was markedly suppressed by hypoxia. Overexpression of the active form of S6K increased the sensitivity of LLC cells to hypoxia. On the other hand, inhibition of PI3K or mTOR dramatically reduced hypoxia-induced cell death under hypoxic conditions. Under hypoxic conditions, blockade of the PI3K or mTOR pathway increased levels of intracellular ATP and delayed decreases in pH and glucose level in culture medium, without affecting the cell cycle.

Perineal-onset Fournier’s gangrene in a patient undergoing hemodialysis – importance of perineal-onset manifestation

We present a rare case of perineal-onset Fournier's gangrene in a patient undergoing hemodialysis. A 51-year-old Japanese man manifested an acute-onset perineal pain with perirectal abscess; subsequently, the pain extended to the abdomen, chest, and loin despite quick treatment. His consciousness deteriorated to delirium and he died of septic shock on the third day of admission. Computed tomography (CT) revealed soft-tissue air along the right rectal wall, moreover, the infection extended to the anterior wall of the bladder and the right peripsoas muscle. On the basis of the clinical course and CT findings, the patient was diagnosed as having the complications of Fournier's gangrene, however, no scrotal lesions were detected. Fournier's gangrene is considered to be easily diagnosed on the basis of skin lesions, such as scrotal erythema and swelling. However, in the early stage, the diagnosis of Fournier's gangrene is difficult in a patient with perineal pain before the detection of skin lesions. In conclusion, definitely the key to improving the prognosis of this fulminant infection is the prompt recognition of the pathological process. Therefore, Fournier's gangrene should always be considered when patients undergoing hemodialysis manifest perirectal disorders, even when no scrotal lesions are detected, because there is the possibility of intra-abdominal and intra-retroperitoneal infections resulting in septic shock.

Intra-oral fluoride retention 3 minutes after fluoride mouthrinsing in 4- to 5-year-old children: effects of fluoride concentration and rinsing time

This study was undertaken to explore the site-specific retention rate and the possibility of shortening fluoride (F) mouthrinsing time of kindergarten children. Fluoride retention after 10-, 20- and 30-second mouthrinsing was determined in 43 kindergarten children aged 4-5 years. Tooth surfaces were sampled by a paper point method. Fluoride concentrations in the salivary film on tooth surfaces increased from primary molars to primary incisors in the maxilla and decreased from primary molars to primary incisors in the mandible. The fluoride solution reached the primary molars even after a 10-second rinse, but F concentrations were higher after 20 s than after 10 s and significantly higher after 30 s than after 10 s. No significant difference was observed between 20 and 30 s. The average total F retained in the mouth was 0.13 mg after 20 s and 0.17 mg after 30 s. It was concluded that 30-second mouthrinsing, which is used extensively in Japanese kindergartens, can be shortened to 20 s.

Quantitative nested reverse transcriptase PCR vs. real-time PCR for measuring AML1/ETO (MTG8) transcripts

A quantitative nested reverse transcriptase polymerase chain reaction (QN-RT-PCR) method was developed using a plasmid cDNA containing the AML1/ETO (MTG8) fusion transcript from Kasumi-1 cells, an acute-myelogenous leukemia cell line with the t(8;21) translocation. In this method, the plasmid was detectable at a concentration of 10(-17) m. The fusion transcript in a mixture of 10(7) Rice94 (Burkitt lymphoma cell line) cells containing two Kasumi-1 cells was detectable at 10(-17) m. In a previously published real-time PCR method, the plasmid containing the fusion transcript was detectable at 10(-16) m or higher, and 20 or more Kasumi-1 cells were detectable in 10(7) Rice94 cells. Thus, this QN-RT-PCR method is more sensitive than the real-time PCR. When the same samples were examined by real-time PCR and our QN-RT-PCR method, in one patient in clinical remission after chemotherapy and allogeneic-bone marrow transplantation (BMT), the transcript was detected by QN-RT-PCR 60 days prior to hematological relapse, in contrast to 10 days before hematological relapse by real-time PCR. The transcript level was below 10(-17) m (undetectable) with this QN-RT-PCR in patients in clinical remission after chemotherapy and BMT, while it was 10(-15)-10(-16) m in patients in clinical remission after chemotherapy alone. The quantitative difference of the transcript level in minimal residual disease (MRD) between these two different types of clinical remission was estimated to be at least 10(2)-fold. This QN-RT-PCR method is useful for predicting hematological relapse and for quantitatively estimating MRD in different types of clinical remission.

Endoscopic mucosal resection of superficially spreading colonic neoplasms larger than 5 cm in the right colon after injection of dilute sodium hyaluronate: report of two cases

Submucosal injection is the most important procedure for the safe performance of endoscopic mucosal resection in the large intestine while avoiding the risk of perforation. We used dilute sodium hyaluronate containing Bosmin and achieved safe piecemeal resection of large superficial tumors in the right colon in two patients. Piecemeal snare resection is considered to be acceptable if all the tissue pieces can be collected for histopathological diagnosis.

Papanicolaou tests and molecular analyses using new fluid-based specimen collection technology in 3000 Japanese women

A fluid-based Papanicolaou test has been established to improve sample collection and preparation. This study was the first large-scale investigation in Japan to examine the feasibility of using fluid-based Papanicolaou specimens to detect human papillomavirus (HPV) using Hybrid Capture II and polymerase chain reaction (PCR). Three thousand patients who visited Keio University Hospital between October 2000 and February 2001 were enrolled in the study. The results of the fluid-based Papanicolaou tests corresponded well with those of conventional Papanicolaou smears (96.8% concordance). The sensitivities of cervical neoplasia detection using the fluid-based Papanicolaou test (73.9%) and Hybrid Capture II (76.3%, P=0.55) were not significantly different. Among the cervical intraepithelial neoplasia 3 and squamous cell carcinoma specimens, HPV 16 and HPV 52 were predominantly detected using the PCR method. Although some DNA samples extracted from the fluid-based specimens were degradaded, PCR and direct sequencing could be performed without difficulty even after 1 year of specimen storage. We conclude that fluid-based Papanicolaou specimens can be applied to investigate HPV infection.

Validity of simple mucosal biopsy criteria combined with endoscopy predicting patients with ulcerative colitis ultimately requiring surgery: a multicenter study

BACKGROUND

Recent mucosal biopsy criteria combined with endoscopy effectively differentiate patients with ulcerative colitis ultimately requiring surgery (UC-S) from those receiving medication alone (UC-M). However, the criteria were inconvenient in practical use because of the need for complicated calculations, and the validity has not been verified in other institutes where the indications for surgery may differ. The aims of this multicenter study were to propose simple criteria in which calculation can be performed by mental arithmetic and to measure their validity.

METHODS

Based on the above original criteria, we constructed simple criteria in which coefficients and constant were simplified to integral numbers. The criteria consisted of the diagnostic categories, highest-risk, high-risk, unpredictable, low-risk, and lowest-risk of surgery. The validity of these proposed criteria was evaluated in 121 patients with UC-S and 186 with UC-M from 11 institutes.

RESULTS

The categories of high-risk and low-risk had sensitivities exceeding 86.0% and specificities exceeding 95.2%, and the validities were maintained at high levels in most individual institutes. There was little difference in validity between the proposed and original criteria when testing using the same patients.

CONCLUSIONS

Despite simplified coefficients and constant, the proposed criteria reliably predicted the eventual clinical outcome of patients with ulcerative colitis and would be helpful in determining the necessity of surgery.

Reversal of the resistance to STI571 in human chronic myelogenous leukemia K562 cells

STI571, an Abl-specific tyrosine kinase inhibitor, selectively kills Bcr-Abl-containing cells in vitro and in vivo. However, some chronic myelogenous leukemia (CML) cell lines are resistant to STI571. We evaluated whether STI571 interacts with P-glycoprotein (P-gp) and multidrug resistance protein 1 (MRP1), and examined the effect of agents that reverse multidrug resistance (MDR) on the resistance to SI571 in MDR cells. STI571 inhibited the [(125)I]azidoagosterol A-photolabeling of P-gp, but not that of MRP1. K562/MDR cells that overexpress P-gp were 3.67 times more resistant to STI571 than the parental Philadelphia-chromosome-positive (Ph +) CML K562 cells, and this resistance was most effectively reversed by cepharanthine among the tested reversing agents. The concentration of STI571 required to completely inhibit tyrosine phosphorylation in K562/MDR cells was about 3 times higher than that in K562 cells, and cepharanthine abolished the difference. In KB-G2 cells that overexpress P-gp, but not Bcr-Abl, 2.5 micro M STI571 partly reversed the resistance to vincristine (VCR), paclitaxel, etoposide (VP-16) and actinomycin D (ACD) but not to Adriamycin (ADM) or colchicine. STI571 increased the accumulation of VCR, but not that of ADM in KB-G2 cells. STI571 did not reverse resistance to any agent in KB/MRP cells that overexpress MRP1. These findings suggest that STI571 is a substrate for P-gp, but is less efficiently transported by P-gp than VCR, and STI571 is not a substrate for MRP1. Among the tested reversing agents that interact with P-gp, cepharanthine was the most effective agent for the reversal of the resistance to STI571 in K562/MDR cells. Furthermore, STI571 itself was a potent reversing agent for MDR in P-gp-expressing KB-G2 cells.

Reversal of P-glycoprotein mediated multidrug resistance by a newly synthesized 1,4-benzothiazipine derivative, JTV-519

A newly synthesized 1,4-benzothiazipine derivate, 4-[3-(4-benzylpiperidin-1-yl) propionyl]-7-methoxy-2,3,4,5-tetrahydro-1, 4-benzothiazepine monohydrochloride (JTV-519) was examined for its ability to reverse P-glycoprotein (P-gp) and multidrug resistance protein 1 (MRP1) mediated multidrug resistance (MDR) in K562/MDR and KB/MRP cells, respectively. JTV-519 at 3 microM reversed the resistance of K562/MDR cells to vincristine (VCR), taxol, etoposide (VP16), adriamycin (ADM) and actinomycin D and at 0.5 or 1 microM reversed their resistance to STI571. JTV-519 at 10 microM enhanced the accumulation of ADM in K562/MDR cells to the level in parental K562 cells and inhibited the efflux of ADM from K562/MDR cells. Photoaffinity labeling of P-gp with 3H-azidopine was almost completely inhibited by 500 microM JTV-519. JTV-519 at 3 microM also partially reversed the resistance of KB/MRP cells to VCR and at 500 microM partially inhibited the photoaffinity labeling of MRP1 with (125)I-II-azidophenyl agosterol A (125I-azidoAG-A). These results suggest that JTV-519 reversed the resistance to the anti-cancer agents in P-gp and MRP1 overexpressing multidrug-resistant cells by directly binding to P-gp and MRP1, and competitively inhibiting transport of the anti-cancer agents.

Ankylosing spondylitis associated with vitiligo: a case report

Abstract Vitiligo is a very common disease and is suspected to be autoimmune in its pathogenesis. Many autoimmune complications, such as Hashimoto's thyroiditis, are reportedly associated with vitiligo. The pathogenesis of ankylosing spondylitis (AS) is also suspected to be autoimmune, triggered by some infection. We report a 56-year-old man with concurrent vitiligo and AS, and suggest that both diseases could have a common autoimmune background.

[Expression of telomerase activity in thymoma and thymiccarcinoma tissues; a clinicopathological study]

BACKGROUND

Telomerase is a nucleoprotein complex that caps the physical termini of all eukaryotic chromosomes. It is suggested that telomerase play important roles in unlimited cell division acquisition of the malignant phenotype. We studied the relation of telomerase activity in thymoma and thymic carcinoma to the clinicopathological features of these lesions.

METHODS

Tissue specimens were surgically resected from patients with thymoma and thymic carcinoma. Telomerase activity was evaluated according to a modified telomeric repeat amplification protocol (TRAP) assay.

RESULTS

Telomerase activity was detected in all thymic epithelial tumors. The activity (mean +/- SD: unit/microgram.protein) in thymoma (n = 17) was significantly higher than that in thymic carcinoma (n = 7) [431.8 +/- 400.1 vs. 68.8 +/- 39.8: p < 0.01]. Telomerase activities in thymoma and thymic carcinoma were significantly higher than that in primary lung adenocarcinoma (33.5 +/- 39.2: n = 47), studied as control (p < 0.01). In patients with thymoma, telomerase activity did not correlate with tumor stage according to Masaoka classification (p = 0.776). In patients with thymic carcinoma, however, telomerase activity positively correlated with tumor stage (p = 0.02). In thymoma, telomerase activity positively correlated with the ratio of induced lymphocytes according to Rosai's classification (p = 0.045).

CONCLUSION

In thymoma, telomerase activity reflects the presence of immature T-cell lymphocytes in tumor tissue rather than tumor stage or malignant phenotype. In thymic carcinoma, telomerase activity derived directly from cancer cells may relate to tumor stage.

Successful allogeneic blood stem cell transplantation for aplastic anemia in a patient with renal insufficiency requiring dialysis

A 27-year-old man with aplastic anemia and renal insufficiency requiring dialysis underwent allogeneic PBSCT. The preparative regimen consisted of melphalan, ATG and TLI. GVHD prophylaxis consisted of cyclosporine and prednisolone. He was dialyzed prior to administration of melphalan and at 24 and 72 h after it. Otherwise, the dialysis schedule was unchanged, at three times a week. Engraftment was rapid. Regimen-related toxicity was minimal. Pharmacokinetic parameters of melphalan were not significantly altered with its plasma half-life 1.5 h. Patients with renal failure can receive allogeneic HSCT, and a combination of melphalan, ATG and TLI may serve as an alternative to CY and ATG.

Enhanced nucleotide excision repair in cisplatin resistant human KB carcinoma cells

We previously reported that enhanced active efflux of cisplatin and increased GSH level were observed in KCP-4 cells. In the present study, KCP-4 cells were found to be cross-resistant to ultraviolet (UV) compared with parental KB-3-1 cells. Enhanced nucleotide excision repair (NER) was verified by time-dependent repair of UV-induced DNA damage. In addition, the amount of platinum bound to DNA after exposure to cisplatin decreased in a time-dependent manner in KCP-4 cells and this was reversed by aphidicolin, a DNA polymerase inhibitor. In stationary phase cultures, aphidicolin increased the sensitivity of KCP-4 cells to cisplatin. The expression of xeroderma pigmentosum complementation group F (XPF), an endonuclease involved in NER, was upregulated in KCP-4 cells. In KCP-4 cells the expression of hMSH6, one of the mismatch repair (MMR) factors, was decreased compared to parental KB-3-1 and revertant KCP-4R cells. However, KCP-4 cells were cross-resistant to oxaliplatin, and microsatellite instability was not observed in them. These findings suggest that the enhanced NER activity for DNA damage caused by cisplatin may be involved in cisplatin resistance in KCP-4 cells.

Radio-guided sentinel node detection for gastric cancer

BACKGROUND

Radio-guided detection of sentinel nodes (SNs) has been used to predict regional metastases in patients with malignant melanoma and breast cancer. However, the validity of the SN hypothesis is still controversial for gastrointestinal cancers including gastric cancer. The aim of this study was to test the feasibility and accuracy of radio-guided mapping of SNs for gastric cancer.

METHODS

Some 145 consecutive patients with gastric cancer diagnosed as T1 or T2 and evaluated clinically as N0 were enrolled. Endoscopic injection of technetium-99m-radiolabelled tin colloid was performed before operation and radioactive SNs were identified with a gamma probe. Standard radical gastrectomy with lymphadenectomy was performed in all patients and all resected nodes were evaluated by routine histopathological examination.

RESULTS

Using radio-guided methods, SNs were detected in 138 (95.2 per cent) of 145 patients. The SN was positive in 22 of 24 patients with lymph node metastasis. The incidence of metastasis in the SNs (7.8 per cent) was significantly higher than that in the non-SNs (0.3 per cent) (P < 0.01). The diagnostic accuracy according to SN status was 98.6 per cent (136 of 138).

CONCLUSION

Radio-guided SN mapping is an accurate diagnostic procedure for detecting lymph node metastasis in patients with early-stage gastric cancer.

Radio-guided sentinel node detection for gastric cancer

BACKGROUND

Radio-guided detection of sentinel nodes (SNs) has been used to predict regional metastases in patients with malignant melanoma and breast cancer. However, the validity of the SN hypothesis is still controversial for gastrointestinal cancers including gastric cancer. The aim of this study was to test the feasibility and accuracy of radio-guided mapping of SNs for gastric cancer.

METHODS

Some 145 consecutive patients with gastric cancer diagnosed as T1 or T2 and evaluated clinically as N0 were enrolled. Endoscopic injection of technetium-99m-radiolabelled tin colloid was performed before operation and radioactive SNs were identified with a gamma probe. Standard radical gastrectomy with lymphadenectomy was performed in all patients and all resected nodes were evaluated by routine histopathological examination.

RESULTS

Using radio-guided methods, SNs were detected in 138 (95.2 per cent) of 145 patients. The SN was positive in 22 of 24 patients with lymph node metastasis. The incidence of metastasis in the SNs (7.8 per cent) was significantly higher than that in the non-SNs (0.3 per cent) (P < 0.01). The diagnostic accuracy according to SN status was 98.6 per cent (136 of 138).

CONCLUSION

Radio-guided SN mapping is an accurate diagnostic procedure for detecting lymph node metastasis in patients with early-stage gastric cancer.