Relationship between mucin expression of gastric intramucosal signet ring cell carcinoma and its background mucosa.

The intramucosal lesion of gastric signet ring cell carcinoma (SIG) is known to form a layered structure (LS) that simulates mucin expression in ordinary gastric mucosa. In this study, we suspected the influence of background mucosa on the formation of LS and performed histopathological analysis. We examined 35 cases of intramucosal SIG with a maximum diameter of 30 mm or less. The LS patterns were classified into those with a layer of MUC6-positive cells (complete pattern, CP) and those lacking this layer (incomplete pattern, ICP). The relationship between LS patterns and the characteristics of the background mucosa, the expression of MUC2 (intestinal-type mucin antigen), MUC5AC (foveolar-type mucin antigen), and Ki-67 (the marker of cell proliferation activity) was examined by histochemistry and immunohistochemistry. Intestinal metaplasia in the background mucosa and MUC2 expression were frequently observed in cases with ICP. Ki-67-positive cells were much more and they were distributed more widely in the lesion of cases with ICP alone than in the other cases. Mucin expression and LS formation of gastric SIG are strongly influenced by its background mucosa. The cases completely lacking MUC6 expression may have higher malignant potential.

Expression and intracellular localization of matrix metalloproteinases in intraductal papillary mucinous neoplasms of the pancreas.

To analyze the expression of matrix metalloproteinases (MMPs) and their relationships with the histological grades of the intraductal papillary mucinous neoplasm (IPMN) of the pancreas, we examined the frequency of expression and intracellular localization of MMP1, MMP2, MMP3, MMP7, and MMP9 in IPMN by immunohistochemistry. A total of 45 IPMN lesions (14 adenomas, 17 borderline lesions, nine noninvasive carcinomas, and five invasive lesions) from 21 patients were examined. MMP1, MMP2, MMP7, and MMP9 were expressed in tumor cells. Frequency of tumor cells expressing MMP7 was low in adenomas (median, 5.0%), higher in borderline lesions (median, 30.0%), in noninvasive carcinomas (median, 50.0%), and in invasive lesions (median, 80.0%), with a significant trend (P < 0.0001). Such a trend was also observed when the lesions were classified into gastric and intestinal subtypes (P < 0.0001 and P = 0.011, respectively). Basolateral expression of MMP7 in tumor cells was more prominent in lesions with higher histological grades (P < 0.0001). The frequency and the localization of MMP1, MMP2, and MMP9 did not correlate to the histological grades. MMP7 may contribute to the process by which IPMN advances from adenoma to carcinoma and to subsequent invasion of tumor cells in IPMN.

Rapid induction of IAP family proteins and Smac/DIABLO expression after proapoptotic stimulation with doxorubicin in RPMI 8226 multiple myeloma cells.

We studied the expression dynamics of inhibitor of apoptosis protein (IAP) family members and Smac/DIABLO after treatment with doxorubicin in human multiple myeloma cell line RPMI 8226 and its doxorubicin-resistant variant DRR. Proapoptotic stimulation with doxorubicin rapidly induced the overexpression of mRNA as well as protein for IAPs in RPMI 8226 cells followed by a gradual decrease of their expression. Smac/DIABLO, which is known to neutralize IAPs, showed increased expression at the mRNA level after treatment; however, Western blot analysis revealed a slight decrease of the amount of protein. Immunoprecipitation analysis revealed the association of Smac/DIABLO with cIAP1 or XIAP after treatment with doxorubicin. In contrast to the RPMI 8226 cells, DRR cells did not undergo apoptosis in response to doxorubicin treatment. The DRR cells had higher levels of IAPs expression at the mRNA level and did not show a remarkable peak or decrease in the expression of mRNAs for cIAP1, cIAP2, XIAP, and survivin after treatment with doxorubicin. Furthermore, the expression of Smac/DIABLO mRNA was not up-regulated after treatment. These findings indicate that the suppression of IAPs expression by Smac/DIABLO shortly after proapoptotic stimulation might play a role in the mechanisms of apoptotic induction, and that the maintenance of high IAPs expression and low Smac/DIABLO expression after treatment might lead to the doxorubicin-resistance of multiple myeloma cells.

Frequency and number of neuroendocrine tumor cells in prostate cancer: no difference between radical prostatectomy specimens from patients with and without neoadjuvant hormonal therapy.

BACKGROUND: Neuroendocrine tumor cells in prostate cancer are thought to increase after hormonal therapy due to neuroendocrine differentiation of tumor cells. This assumption is based on the histological analyses of limited portions of the cancerous lesions examined. METHODS: Radical prostatectomy specimens were obtained from 122 consecutive patients with prostate adenocarcinoma, 70 of whom underwent prostatectomy alone (Group A) and 52 with neoadjuvant hormonal therapy (Group B). Sections from all the 5-mm-thick slices from formalin-fixed specimens were immunostained for chromogranin-A, and the total number of choromogranin-A-positive neuroendocrine tumor cells were counted. RESULTS: No difference was found between Groups A and B in the frequency of cancer with neuroendocrine cells. The total number of neuroendocrine cells in cancer varied widely with no difference of median values in the two groups. CONCLUSIONS: These results do not support the assumption that hormonal therapy induces neuroendocrine differentiation, but suggest androgen-independent neuroendocrine cells existed before therapy.

HSP60 may predict good pathological response to neoadjuvant chemoradiotherapy in bladder cancer.

BACKGROUND: Heat shock proteins (HSPs) play crucial roles in cellular responses to stressful conditions. Expression of HSPs in invasive or high-risk superficial bladder cancer was investigated to identify whether HSPs predict pathological response to neoadjuvant chemoradiotherapy (CRT). METHODS: Immunohistochemistry was used to assess expression levels of HSP27, HSP60, HSP70, HSP90 and p53 in 54 patients with invasive or high-risk superficial bladder cancer, prior to low-dose neoadjuvant CRT, followed by radical or partial cystectomy. Patients were classified into two groups (good or poor responders) depending on pathological response to CRT, which was defined as the proportion of morphological therapeutic changes in surgical specimens. Good responders showed morphological therapeutic changes in two-thirds or more of tumor tissues. In contrast, poor responders showed changes in less than two-thirds of tumor tissues. RESULTS: Using a multivariate analysis, positive HSP60 expression prior to CRT was found to be marginally associated with good pathological response to CRT (P = 0.0564). None of clinicopathological factors was associated with HSP60 expression level. In the good pathological responders, the 5-year cause-specific survival was 88%, which was significantly better than survival in the poor responders (51%) (P = 0.0373). CONCLUSIONS: Positive HSP60 expression prior to CRT may predict good pathological response to low-dose neoadjuvant CRT in invasive or high-risk superficial bladder cancer.

Loss of uroplakin III expression is associated with a poor prognosis in patients with urothelial carcinoma of the upper urinary tract.

OBJECTIVE: To investigate the association between the expression of uroplakin III (UPIII) and the prognosis of patients with urothelial carcinoma of the upper urinary tract, as uroplakins are urothelium-specific markers of terminal urothelial differentiation. PATIENTS AND METHODS: Clinicopathological and follow-up data from 71 patients who had undergone radical nephroureterectomy and lymph node dissection or sampling for urothelial carcinoma of the upper urinary tract were reviewed. The expression of UPIII was evaluated immunohistochemically in surgical specimens. Cancer-specific survival was calculated using Kaplan-Meier plots. Prognostic values of clinicopathological variables including UPIII expression status, tumour stage and grade were evaluated by univariate analyses, followed by multivariate analysis using the Cox proportional-hazard model. RESULTS: In all specimens there was intense UPIII immunoreactivity of umbrella cells of normal urothelium. In tumour samples, UPIII expression was positive in 75% of < or = pT1 tumours and 40% of > or = pT2 (P = 0.02), and in 65% of grade 1-2 tumours and 33% of grade 3 (P = 0.009). Of the 71 patients, 21 died from the disease during the median follow-up of 61 months. The cancer-specific survival of patients with negative UPIII expression was significantly worse than that of those with positive UPIII expression (5-year cancer-specific survival, 100% vs 46%, P < 0.001). Neither patient age at diagnosis, histological grade, sex, or multiplicity of the tumour had significant prognostic value. Multivariate analysis revealed that UPIII expression was the most powerful prognostic indicator (P < 0.001) followed by tumour stage (P = 0.04) and lymph node metastasis (P = 0.05). CONCLUSION: The present data suggest that UPIII expression is a powerful prognostic factor in patients with upper urinary tract urothelial carcinoma.

Basement membrane matrix modifies cytokine interactions between lung cancer cells and fibroblasts.

OBJECTIVE: Proliferation of fibroblasts (desmoplastic reaction) in the lung adenocarcinomas is an important phenomenon that correlates with metastases and poor prognosis. Because basement membranes are often involved in the desmoplastic areas and many cytokines have binding capacity to basement membrane molecules, we hypothesized that basement membrane modify the paracrine effects between cancer cells and fibroblasts via the fibrogenic cytokines and this hypothesis was experimentally investigated. METHODS: The effects of conditioned media derived from ten lung carcinoma cell lines and normal airway epithelial cells on DNA synthesis of fetal lung fibroblasts were determined. We focused on fibroblast growth factor 2 (FGF-2) as the candidate paracrine cytokines and examined their diffusion through an experimental basement membrane matrix model, Matrigel. RESULTS: All the conditioned media promoted DNA synthesis of fetal lung fibroblasts. Detection by ELISA methods and the neutralizing antibodies suggested that FGF-2 was one of the responsible factors for the growth promotion. Diffusion of FGF-2 across the polycarbonate membrane was suppressed by coating with Matrigel. When FGF-2-secreting A549 cells were covered with Matrigel, FGF-2 was stored in Matrigel and its diffusion into the culture media was significantly reduced. Binding of FGF-2 to Matrigel was completely blocked by a basic protein, protamine sulfate. In the presence of protamine sulfate in Matrigel overlaid on A549 cells, diffusion of FGF-2 increased 7-fold as much as that without overlaid Matrigel. CONCLUSION: These results suggest that the basement membrane acts as a barrier to the diffusion and a reservoir of cytokines secreted by cancer cells, and that the subsequent degradation of the basement membrane by cancer cells could release the stored cytokines and promote growth of fibroblasts.

Propionibacterium acnes is the most common bacterium commensal in peripheral lung tissue and mediastinal lymph nodes from subjects without sarcoidosis.

BACKGROUND: In studies of the unknown etiology of sarcoidosis, Propionibacterium acnes (a possible agent) was found in the lungs and lymph nodes of many sarcoidosis patients and some control subjects. P. acnes might be commensal not only to the skin, conjunctivae, and intestine, but also to the lungs and lymph nodes of individuals without sarcoidosis. METHODS: We cultured peripheral lung tissue and various lymph nodes obtained from patients with diseases other than sarcoidosis. DNA of 45 isolates of P. acnes from these patients, 67 isolates from normal skin, conjunctiva, and intestine, and 39 isolates from sarcoid lymph nodes were compared by random amplified polymorphic DNA analysis. RESULTS: P. acnes was isolated from half of 43 lungs and 8 of 11 mediastinal lymph nodes, mostly in pure culture. P. acnes was isolated from half of 20 gastric and 3 of 12 intestinal lymph nodes; intestinal bacteria were also numerous. In general, fewer than 500 colony-forming units of P. acnes per gram tissue were isolated, but 4 lung tissue specimens, 2 of which had a few granulomas, had many more. P. acnes strains from a particular site (lung, lymph node, skin or conjunctivae, and intestine) were genetically similar, more than isolates obtained from different sites. Lymph-node isolates from subjects with and without sarcoidosis differed little. CONCLUSION: These results suggest that P. acnes normally resides in peripheral lung tissue and mediastinal lymph nodes and that the strains of P. acnes isolated from sarcoid lymph nodes were not specific to sarcoidosis.

Identification of hydroxyapatite deposits in the smooth muscle cells and ganglion cells of autopsied small intestines.

We have studied the deposition of calcium salts in the autopsied intestines which have not been described previously as far as we were able to determine. In order to clarify the incidence, predisposing conditions, mineral compositions of the deposited materials and clinical significance of this phenomenon, we examined 76 cases of consecutive autopsied small intestines by von Kossa's staining. Deposited calcium salts were further examined by electron microscopically, energy-dispersive X-ray spectroscope and electron diffraction analysis. Deposition of calcium salts was observed in the small intestines of 13 cases. Among them, 10 cases were accompanied by hypercalcemia. Deposition of calcium salts was mainly observed in smooth muscle cells of the proper muscle layers and ganglion cells of the Auerbach's myenteric plexus. Intestinal calcinosis was frequently accompanied by deposition of calcium salts in the proper muscle layers of esophagus and large intestine, renal tubules and cardiac myocardial cells. Electron microscopically, the calcium salts were identified as needle-shaped crystals and located on the surface of the extracellular-collagen bundles, in the cytoplasm, mitochondria and nucleus of the smooth muscles cells. Energy-dispersive X-ray spectroscope and electron diffraction analysis suggested the deposited calcium salts as hydroxyapatite. Two patients among the six cases with moderate to severe calcium deposition showed clinical manifestation of paralytic ileus. In conclusion, intestinal calcinosis was frequently observed mostly associated with hypercalcemia. Calcium salts of hydroxyapatite were deposited to the smooth muscle cells and the Auerbach's myenteric plexus of the muscular layer. Deposition of calcium salts might occasionally causes the paralytic ileus but clinical significance of this lesion requires further examination.

Expression of IAP family proteins in esophageal cancer.

Members of the inhibitor of apoptosis protein (IAP) family, including survivin, have been reported to be expressed in many tumors. However, their expression in esophageal cancer has not been clarified completely. We investigated the expression of mRNA for IAP family proteins in samples from esophageal cancers and their adjacent normal mucosa tissues by real-time quantitative RT-PCR. The survivin expression in esophageal cancer was significantly higher than that in normal mucosa (P < 0.05). Other IAP family proteins including cIAP1, cIAP2, NAIP and XIAP tended to show stronger expression in cancer tissue than normal mucosa, although the differences were not significant. As to the histological type of tumor, poorly differentiated squamous cell carcinomas exhibited significantly higher level of expression than well-differentiated carcinomas (P < 0.05). The proportion of apoptotic cells of cancer tissue inversely correlated with the intensity of survivin expression (P < 0.05). Immunohistochemical staining demonstrated cytoplasmic as well as nuclear expression of survivin in esophageal cancer, and further, in situ hybridization analysis demonstrated cytoplasmic expression of mRNA for survivin. The results suggest that the expression of IAP family proteins, especially survivin, may be associated with the biological character of esophageal cancer, such as apoptosis.

Mucin core protein expression by colorectal mucinous carcinomas with or without mucus hyperplasia.

BACKGROUND: In the categorization of colorectal mucinous carcinomas, much attention has been paid to the amount of extracellular mucin, but little to that of intracellular mucin. Perhaps this factor would be useful in further categorization. METHODS: We estimated the amount of intracellular mucin morphologically, and classified colorectal tumors (tubular adenomas, mucinous carcinomas, and nonmucinous carcinomas) into two categories each, those with and without intracellular mucus hyperplasia. From preliminary results, we chose a range of 50% or more for the ratio of intracellular mucus to the total area of tumor cells for our definition of such hyperplasia. Then, mucin expression in the different categories was examined immunochemically with antibodies to the mucin core proteins MUC1, MUC2, MUC5AC, and MUC6. RESULTS: MUC1 expression was found in none of the 40 adenomas, 8 (17%) of the 48 mucinous carcinomas (with little difference in those with and without mucus hyperplasia), and 4 (16%) of the 25 nonmucinous carcinomas. MUC2 was found in all mucinous carcinomas. MUC5AC was found in 18 (86%) of the 21 mucinous carcinomas with mucus hyperplasia and 18 (90%) of the 20 adenomas with mucus hyperplasia, but in only 9 (33%) of the 27 mucinous carcinomas without mucus hyperplasia, 5 (20%) of the 25 nonmucinous carcinomas, and 2 (10%) of the 20 adenomas without mucus hyperplasia. CONCLUSIONS: Mucinous carcinomas with and without mucus hyperplasia may arise from adenomas with and without mucus hyperplasia, respectively. The amount of intracellular mucin may be a morphologic reflection of the origin of colorectal mucinous carcinomas.

Prognostic significance of endothelial Per-Arnt-sim domain protein 1/hypoxia-inducible factor-2alpha expression in a subset of tumor associated macrophages in invasive bladder cancer.

PURPOSE: Endothelial Per-Arnt-Sim domain protein 1 (EPAS1) is induced under hypoxia and it transactivates a series of genes involved in angiogenesis and energy metabolism. Recent studies showed that EPAS1 is expressed in tumor associated macrophages (TAMs), which have multifaceted roles in tumor progression. We hypothesized that EPAS1 expressed in TAMs may contribute to bladder cancer progression. MATERIALS AND METHODS: Clinicopathological and followup data on 69 patients undergoing radical cystectomy for T1-4N0-2M0 high grade bladder urothelial carcinoma were reviewed. Quantitative immunohistochemical analysis of TAMs and EPAS1 was performed separately in invasive front and in other superficial parts of carcinoma tissues. TAM counts and EPAS1 positive cell counts were compared with pathological variables and cancer specific survival (CSS). RESULTS: The 5-year CSS rate in the 69 patients was 69% at a median followup of 58 months (range 2 to 196). EPAS1 expression was restricted to a small subset of TAMs. Although TAM counts were not associated with T stage or lymph node metastasis, EPAS1 expressing TAM counts were significantly associated with higher T stage. On univariate and multivariate analyses higher EPAS1 expressing TAM counts in invasive front along with higher T stage and positive lymph node metastasis were significantly associated with shorter CSS, while total TAM counts or EPAS1 expressing TAM counts in other superficial parts did not. CONCLUSIONS: Despite limited prognostic effects of total TAMs EPAS1 expressing TAMs were associated with a poor prognosis of invasive bladder cancer, suggesting that EPAS1 expressed in a subset of TAMs mediates bladder cancer progression.

Impaired p63 expression associates with poor prognosis and uroplakin III expression in invasive urothelial carcinoma of the bladder.

PURPOSE: p63 is proposed to play roles in normal development and differentiation of stratified epithelia including urothelium. We recently reported that impaired p63 expression is a common feature of high-grade invasive urothelial carcinomas and associates with reduced beta-catenin. On the basis of these facts, we proposed that impaired p63 expression contributes to biological aggressiveness of urothelial neoplasms. Uroplakin (UP) III expression was also evaluated to investigate a possible association between loss of p63 expression and terminal urothelial differentiation. EXPERIMENTAL DESIGN: Expression of p63, beta-catenin, and UP III was immunohistochemically analyzed in 75 cystectomy specimens of high-grade invasive bladder carcinoma. p63 expression was semiquantified and compared with pathological parameters, expression of beta-catenin and UP III, and cancer-specific survival. RESULTS: Lower p63 expression was significantly associated with higher Tumor-Node-Metastasis (TNM) stage (P = 0.0004), lymph-node metastasis (P = 0.013), and reduced beta-catenin expression (P = 0.003). By univariate analysis, lower p63 expression, along with TNM stage and lymph-node status, were significantly associated with a poor prognosis (P = 0.0005), whereas reduced beta-catenin was not. By multivariate analysis, the prognostic effect of p63 expression was independent of TNM stage and lymph-node status with marginal statistical significance (P = 0.074). UP III expression was restricted to a subset of p63-negative carcinoma cells, including even anaplastic carcinoma cells. CONCLUSIONS: Impaired p63 expression characterizes biological aggressiveness of high-grade invasive urothelial carcinomas. Moreover, loss of p63 expression is a prerequisite for UP III expression. Our data suggest that p63 plays critical roles in tumor progression and biochemical terminal differentiation of urothelial neoplasms.

Correlation between the expression of telomerase reverse transcriptase and proliferative activity in breast cancer cells using an immunocytochemical restaining method.

Telomerase activity is thought to contribute to the immortality of cancers. Recently, some investigators described a correlation between the activity of telomerase and the proliferative activity of cancer cells. The aim of this study was to evaluate the correlation between the expression of telomerase-associated protein and proliferative activity. Telomerase reverse transcriptase (TERT) is one of the proteins that correlates with telomerase activity. We investigated TERT protein and its mRNA, and examined the correlation between the TERT protein and Ki-67, which reflects proliferative activity with immunostaining, and its mRNA, which correlates with telomerase activity, using in situ hybridization. Imprint smears from 17 invasive ductal adenocarcinomas were investigated. In most cases positive for TERT mRNA, the percentage of TERT protein-positive cells was also high and was closely related to mRNA (P = 0.024). The positive rates of TERT for the cases with lymph node metastasis were significantly higher than those for the cases without metastasis (P = 0.046). The positivity of TERT protein also correlated significantly with the Ki-67-positive rate (r = 0.82). As the proliferation activity increased, the number of cells positive for both proteins also increased (r = 0.89). In conclusion, it was suggested that the expression of TERT protein is associated with the expression of Ki-67, and is concerned with maintenance of the high proliferative activity in cancer cells with aggressive proliferation.

Absence of either gastric or intestinal phenotype in microscopic differentiated gastric carcinomas.

Differentiated gastric carcinoma (DGC) corresponds roughly to the intestinal type of gastric carcinoma described by Laurén. It has been suggested that DGCs arise from intestinalized gastric mucosa, but recent findings regarding their mucin expression do not support this hypothesis. To evaluate the histogenetic relationship between DGCs and intestinal metaplasia, lesions that are as small as possible should be examined. Twenty-five DGCs, ranging in their greatest dimension from 0.4 to 2.7 mm, were collected and divided into two groups by size. Group A consisted of 13 lesions less than 1.4 mm across, and group B of 12 lesions 1.4 mm or more. The presence of mucin and a brush border was assessed by immunostaining with antibodies against human gastric mucin, pyloric-gland-type mucin, Muc-2 glycoprotein, and CD10 antigen, and the lesions were classified as having the gastric phenotype (G-type), intestinal phenotype (I-type), mixed gastric and intestinal phenotype (M-type), or null phenotype (N-type). Thirteen (52%) of the 25 lesions were N-type, 5 (20%) lesions were G-type, 5 (20%) were I-type, and 2 (8%) were M-type. Group A had a larger proportion of N-type lesions than B (10/13, or 77%, vs. 3/12, or 25%; p = 0.027, chi-square test for proportions). Group B had a larger proportion of G-type lesions than A (5/12, or 42%, vs. 0/13, or 0%; p = 0.033). The phenotypes of the carcinomas and their surrounding mucosa were unrelated. Therefore, DGCs may arise from gastric mucosa affected by intestinal metaplasia or not, without having either the gastric or intestinal phenotype.

Pulmonary granulomas caused experimentally in mice by a recombinant trigger-factor protein of Propionibacterium acnes.

Etiology of sarcoidosis remains unknown. A trigger factor from Propionibacterium acnes causes a cellular immune response in some sarcoid patients but not in nonsarcoid subjects. We examined whether experimentally induced hypersensitivity to the trigger factor gives rise to granulomas. Female C57BL/6 mice primed intravenously with P. acnes or not were sensitized with recombinant-protein RP35, a fragment of P. acnes trigger factor, and complete Freund's adjuvant. In controls, RP35 was replaced with P. acnes or one of two control proteins. In primed and unprimed mice, pulmonary granulomas were found in some of the mice sensitized with RP35 or P. acnes but in no control-protein-sensitized mice. Detection of pulmonary granulomas (25-57%) did not differ significantly between mice sensitized with RP35 or P. acnes, primed or not. No difference in popliteal lymph-node-cell reactivity and serum antibodies to these two antigens was found between mice with and without pulmonary granulomas. P. acnes was cultured from the lungs of 8 (33%) of 24 untreated mice. The recombinant trigger-factor protein of P. acnes caused pulmonary granulomas in primed and unprimed mice sensitized with the protein and adjuvant. Sarcoid granulomas may form during hypersensitivity to antigens of P. acnes indigenous to the affected organ.

In situ localization of Propionibacterium acnes DNA in lymph nodes from sarcoidosis patients by signal amplification with catalysed reporter deposition.

Sarcoidosis is a systemic granulomatous disease of unknown aetiology. Many genomes of Propionibacterium acnes and P. granulosum have been detected in lymph nodes from patients with sarcoidosis. In situ localization of propionibacterial genomes in sarcoid lymph nodes may help to establish an aetiological link between sarcoidosis and these indigenous bacteria. Formalin-fixed and paraffin-embedded biopsy samples of lymph nodes from nine patients with sarcoidosis, nine patients with tuberculosis, and nine patients with non-specific lymphadenitis as controls were examined by quantitative real-time PCR (QPCR) for P. acnes and by in situ hybridization (ISH) that used catalysed reporter deposition (CARD) for signal amplification with digoxigenin-labelled oligonucleotide probes that complemented 16S rRNA of P. acnes. The signals per 250 micro m(2) of tissue sections were counted from inside and outside the granulomas of sarcoidosis and tuberculosis and from control lymph nodes. The number of genomes by QPCR was examined for correlation with the mean signal count by ISH with CARD. In sarcoid samples, one or several signals were detected in the cytoplasm of some epithelioid cells in granulomas and of many mononuclear cells around granulomas. The mean signal counts were higher (p < 0.001) in granulomatous areas than in other areas of sarcoid lymph nodes. Even in their non-granulomatous areas, counts were higher than in granulomatous areas (p = 0.0023) and non-granulomatous areas (p < 0.001) of tuberculous lymph nodes and control lymph nodes (p = 0.0071). Correlation between the results by QPCR and ISH with CARD was significant (r = 0.86, p < 0.001). The accumulation of P. acnes genomes in and around sarcoid granulomas suggests that this indigenous bacterium may be related to the cause of granulomatous inflammation in sarcoidosis.

Schwannoma arising from the tentorium at an unusual location: case report.

OBJECTIVE AND IMPORTANCE: We present a case of schwannoma attached to the tentorium. CLINICAL PRESENTATION: A 41-year-old woman without evidence of neurofibromatosis presented with a 3-month history of headache, positional vertigo, and truncal ataxia. Magnetic resonance imaging revealed an extra-axial cystic mass lesion in the left anteromedial cerebellar region with a dural tail sign. INTERVENTION: The tumor was removed completely by retrosigmoid craniotomy. Dense adhesion of the tumor to the inferior surface of the tentorium was confirmed during surgery. On light microscopic study, this neoplasm was composed of spindle cells and showed palisaded structures. Immunohistochemically, the tumor cells stained positive for S-100 protein and vimentin. Reticulin staining revealed a pericellular pattern of distribution of reticulin fibers. Electron microscopy confirmed the presence of a basement membrane encompassing the tumor cells. From these findings, the tumor was diagnosed as a schwannoma arising from the tentorium. CONCLUSION: To our knowledge, this case report is the first to describe a schwannoma arising from the tentorium. Our case report indicates that schwannoma is a possible pathology in the differential diagnosis of dura-based tumors.

Quantitative analysis of mycobacterial and propionibacterial DNA in lymph nodes of Japanese and European patients with sarcoidosis.

The cause(s) of sarcoidosis is unknown. Mycobacterium spp. are suspected in Europe and Propionibacterium spp. are suspected in Japan. The present international collaboration evaluated the possible etiological links between sarcoidosis and the suspected bacterial species. Formalin-fixed and paraffin-embedded sections of biopsy samples of lymph nodes, one from each of 108 patients with sarcoidosis and 65 patients with tuberculosis, together with 86 control samples, were collected from two institutes in Japan and three institutes in Italy, Germany, and England. Genomes of Propionibacterium acnes, Propionibacterium granulosum, Mycobacterium tuberculosis, Mycobacterium avium subsp. paratuberculosis, and Escherichia coli (as the control) were counted by quantitative real-time PCR. Either P. acnes or P. granulosum was found in all but two of the sarcoid samples. M. avium subsp. paratuberculosis was found in no sarcoid sample. M. tuberculosis was found in 0 to 9% of the sarcoid samples but in 65 to 100% of the tuberculosis samples. In sarcoid lymph nodes, the total numbers of genomes of P. acnes or P. granulosum were far more than those of M. tuberculosis. P. acnes or P. granulosum was found in 0 to 60% of the tuberculosis and control samples, but the total numbers of genomes of P. acnes or P. granulosum in such samples were less than those in sarcoid samples. Propionibacterium spp. are more likely than Mycobacteria spp. to be involved in the etiology of sarcoidosis, not only in Japanese but also in European patients with sarcoidosis.