Secreted frizzled-related protein 4 induces gastric cancer progression and resistance to cisplatin and oxaliplatin via ß-catenin dysregulation.

INTRODUCTION: Gastric cancer is the 5th most common cancer and 3rd leading cause of cancer-related death worldwide. There are three main ways to treat gastric cancer: surgical resection, radiation therapy, and drug therapy. Furthermore, combinations of two to three regimens can improve survival. However, the survival outcomes of chemotherapy in advanced gastric cancer patients are still unsatisfactory. Unfortunately, no widely useful biomarkers have been verified to predict the efficacy of chemotherapy for locally advanced gastric cancer. METHODS: An MTT assay was used to determine the cell viability after cisplatin or oxaliplatin treatment. Western blotting and immunohistochemistry were utilized to examine the sFRP4 level and associated signaling pathways. Immunofluorescence staining was utilized to analyze the location of ß-catenin. Colony formation and Transwell assays were used to analyze the functions related with cisplatin, oxaliplatin and sFRP4. RESULTS: We have found that gastric cancer patients treated with combinations of 5-fluorouracil (5-FU) and cisplatin regimens have better survival rates than those treated with 5-FU-based chemotherapy alone. Secreted frizzled-related protein 4 (sFRP4) was selected as a potential target from stringent analysis and intersection of 5-FU and cisplatin resistance-related gene sets. sFRP4 was shown to be overexpressed in clinical gastric tumor tissues and positively correlated with a worse survival rate. In addition, sFRP4 and ß-catenin were upregulated in cisplatin-resistant and oxaliplatin-resistant gastric cancer cells compared to parental cells. Immunofluorescence staining and nuclear fractionation showed that ß-catenin translocated from the cytosol into the nucleus. Moreover, sFRP4 was detected in the conditioned medium of these resistant cells, which indicates that sFRP4 might have an extracellular role in chemotherapy resistance. Increased migration capacity and dysregulation of epithelial-mesenchymal transition-related markers, which might result from the dysregulation of sFRP4, were observed in cisplatin-resistant and oxaliplatin-resistant gastric cancer cells. DISCUSSION/CONCLUSION: In summary, sFRP4 might play a critical role in resistance to cisplatin and oxaliplatin, cell metastasis and poor prognosis in gastric cancer via the Wnt-ß-catenin pathway. Investigations of the molecular mechanism underlying sFRP4-modulated cancer progression and chemotherapeutic outcomes can provide additional therapeutic strategies for gastric cancer.

Association between hepatic angiosarcoma and end-stage renal disease: nationwide population-based evidence and enriched mutational signature of aristolochic acid exposure.

Hepatic angiosarcoma (HAS) is an aggressive mesenchymal malignancy that remains underexplored with respect to its etiology and mutational landscapes. To clarify the association between HAS and end-stage renal disease (ESRD), we used nationwide data of the National Health Insurance Research Database (NHIRD) in Taiwan, covering ~99% of the population, from 2001 to 2016. To investigate molecular signatures, we performed whole-exome sequencing (WES) in 27 surgical specimens, including nine ESRD-associated cases. The NHIRD analysis demonstrated that HAS ranked second among all angiosarcomas in Taiwan, with the incidence rates of HAS being 0.08, 2.49, and 5.71 per 100,000 person-years in the general population, chronic kidney disease (CKD), and ESRD patients, respectively. The standardized incidence ratios of HAS in CKD and ESRD patients were 29.99 and 68.77, respectively. In comparison with nonhepatic angiosarcoma, the multivariate regression analysis of our institutional cohort confirmed CKD/ESRD as an independent risk factor for HAS (odds ratio: 9.521, 95% confidence interval: 2.995-30.261, p < 0.001). WES identified a high tumor mutation burden (TMB; median: 8.66 variants per megabase) and dominant A:T-to-T:A transversion in HAS with frequent TP53 (81%) and ATRX (41%) mutations, KDR amplifications/gains (56%), and CDKN2A/B deletions (48%). Notably, ESRD-associated HAS had a significantly higher TMB (17.62 variants per megabase, p = 0.01) and enriched mutational signatures of aristolochic acid exposure (COSMIC SBS22, p < 0.001). In summary, a significant proportion of HAS in Taiwan is associated with ESRD and harbors a distinctive mutational signature, which concomitantly links nephrotoxicity and mutagenesis resulting from exposure to aristolochic acid or related compounds. A high TMB may support the eligibility for immunotherapy in treating ESRD-associated HAS. © 2023 The Pathological Society of Great Britain and Ireland.

Deep neural network trained on gigapixel images improves lymph node metastasis detection in clinical settings.

The pathological identification of lymph node (LN) metastasis is demanding and tedious. Although convolutional neural networks (CNNs) possess considerable potential in improving the process, the ultrahigh-resolution of whole slide images hinders the development of a clinically applicable solution. We design an artificial-intelligence-assisted LN assessment workflow to facilitate the routine counting of metastatic LNs. Unlike previous patch-based approaches, our proposed method trains CNNs by using 5-gigapixel images, obviating the need for lesion-level annotations. Trained on 5907 LN images, our algorithm identifies metastatic LNs in gastric cancer with a slide-level area under the receiver operating characteristic curve (AUC) of 0.9936. Clinical experiments reveal that the workflow significantly improves the sensitivity of micrometastasis identification (81.94% to 95.83%, P < .001) and isolated tumor cells (67.95% to 96.15%, P < .001) in a significantly shorter review time (-31.5%, P < .001). Cross-site evaluation indicates that the algorithm is highly robust (AUC = 0.9829).

Dedifferentiation-like tubular and solid carcinoma of the stomach shows phenotypic divergence and association with deficient SWI/SNF complex.

Gastric carcinoma showing an abrupt transition from a tubular to solid pattern is an unusual phenomenon reminiscent of dedifferentiation. The phenotypic and molecular characteristics of this transition are still unclear. We retrospectively collected 41 gastric carcinomas exhibiting dedifferentiation-like tubular to solid transition and applied an array of immunohistochemical stains, including neuroendocrine and hepatocytic markers, to delineate their lineage. The status of Epstein-Barr virus (EBV) infections, mismatch repair proteins, SWI/SNF complex proteins and p53 expression levels were examined. The clinicopathologic differences were assessed by statistical analysis. Except for 10 cases with neuroendocrine differentiation and 2 EBV-associated carcinomas, we identified 8 hepatoid carcinomas and 21 solid adenocarcinomas with loss of CDX2 and/or hep-par1 expression in solid part (12/29). A subset of solid adenocarcinoma was associated with MSI (8) and mutant p53 expression was frequent in non-MSI cases (10/13). We found hepatoid carcinomas usually harbored SMARCA2 loss (5/8), MSI-associated cases commonly had ARID1A loss (6/8), and non-MSI solid adenocarcinomas frequently showed SMARCA2/A4 loss (7/13) with a high rate of concurrent ARID1A loss (4/7). Spatial correlation between solid transition and loss of SWI/SNF complex subunits were seen in 63% of tumors (12/19). Dedifferentiation-like tubular and solid carcinoma was associated with a propensity to inferior survival outcomes (p = 0.034), especially hepatoid carcinoma and in the non-MSI/EBV intestinal subgroup. In conclusion, gastric cancer exhibiting dedifferentiation-like tubular to solid transition is a phenotypically divergent group that shares common alterations in the SWI/SNF complex.

Decreasing recurrence and increasing survival rates in patients of ethmoid or sphenoid intestinal-type adenocarcinomas: Systematic review and meta-analysis with 1126 cases.

BACKGROUND: Ethmoid or sphenoid intestinal-type adenocarcinomas (ITACs) form a distinct subtype of sinonasal adenocarcinomas that occur less than 1 case/100,000/yr. They have obvious exposure relationship to hardwood or leather dusts, infrequent metastasis, but a relatively high local-recurrence rate. They locate at sinuses close to vital structures listed as high-risk areas in surgeries. Even in expert hands, a craniofacial resection is associated with non-negligible mortality and morbidity. Management of these tumors, first or recurrent, needs to weigh these consequences versus the survival, regional-recurrence, and distant-recurrence rates. Due to the rareness of ethmoid or sphenoid ITACs, accurate overall survival and local- or regional-recurrence rates across diverse treatments are unclear. The aim of this study is to report the overall statistics of this cancer and the relationship between enrollment year versus age, recurrence, and survival. METHODS: Systemic review and meta-analysis with 1126 cases across various treatments in the literature. RESULTS: Here, we show that patients of ethmoid or sphenoid ITACs had overall local-, regional-, and distant-recurrence rates of 32.2%, 2.2%, and 10.3%, respectively, with a 5-year overall survival rate of 66.2%. The results present a significant correlation between age, local-recurrent rate, or overall survival rate versus enrollment year. CONCLUSION: This suggests that recent patients of ethmoid or sphenoid ITACs may present at an older mean age, have a lower local-recurrence rate, and have a better 5-year survival rate than before. There was a shifting trend of treating ethmoid ITACs from external approach to endoscopic resection. Clinicians may want to weigh mortality and morbidity rates of external surgeries and these data to share or decide a solution.

Helios Expression in Tumor-Infiltrating Lymphocytes Correlates with Overall Survival of Advanced Gastric Cancer Patients.

Immunotherapy is a highly promising approach for the treatment of gastric cancer, the third-leading cause of overall cancer death worldwide. In particular, tumor-infiltrating lymphocytes and peripheral blood mononuclear cells are believed to mediate host immune responses, although this activity may vary depending on the activation status and/ or their microenvironments. Here, we examined the expression of a specific zinc finger transcription factor, Helios (IKZF2), in gastric tumor-infiltrating lymphocytes by immunohistochemistry and the correlation with survival. Segregation of gastric cancer patients into high- vs. low-Helios-expressing tumor-infiltrating lymphocytes showed those with high expression to exhibit longer survival in gastric cancer patients, Helicobacter pylori-infected gastric cancer patients and advanced stage (III-IV) gastric cancer patients. In particular, Helios expression was an independent factor for survival in advanced gastric cancer patients. We performed immunofluorescence staining to detect Helios expression in tumor-infiltrating lymphocytes and peripheral blood mononuclear cells. We found that Helios is expressed more in CD4+ T cells and little in CD8+ T cells in infiltrated lymphocytes in gastric cancer. In summary, we believe that the study of specific characteristics of tumor-infiltrating lymphocytes can delineate the interactions of immune and tumor cells to improve upon immunotherapy strategies.

Thyroglossal duct lipoma: A rare case report.

RATIONALE: Thyroglossal duct cyst (TGDC), the most common midline neck mass, has several histological diagnoses other than cyst in the literature. We present the first case of thyroglossal duct lipoma. PATIENT CONCERNS: A 63-year-old woman presented with a painless soft midline neck mass for more than 3 years, which enlarged in size and caused a lump sensation during swallowing. DIAGNOSES: Sonography revealed a 3.5 × 3.0 × 3.0-cm homogenous isoechoic oval lesion without an acoustic shadow beyond the thyroid glands. An ultrasound-guided biopsy revealed abundant sheets of fat cells with infiltration of some lymphocytes and histiocytes. Computed tomography revealed a 3.5 × 3.0 × 3.0-cm well-circumscribed ovoid mass with Hounsfield unit (HU) between -50 and -100 and a thyroglossal duct remnant. All these findings supported the diagnosis of thyroglossal duct lipoma. INTERVENTIONS: The patient underwent Sistrunk operation for excision of the neck tumor, and pathological examination revealed an adipose tumor surrounded by benign thyroid tissue, confirming the diagnosis of thyroglossal duct lipoma. OUTCOMES: Neither postoperative complication nor recurrence was noted at the 18-month follow-up. LESSONS: This is the first case of thyroglossal duct lipoma in the literature. Our study extends the disease spectrum of thyroglossal duct mass and suggests that clinicians should consider thyroglossal duct lipoma in the differential diagnosis of a midline neck mass.

The clinicopathological and molecular analysis of gastric cancer with altered SMARCA4 expression.

AIMS: In this study, we examine the clinicopathological and molecular features of gastric cancer (GC) with SMARCA4 alterations. METHODS AND RESULTS: We screened SMARCA4 alterations using immunohistochemistry on 1199 surgically resected GCs with information on Epstein-Barr virus (EBV), microsatellite instability (MSI) and other SWI/SNF subunits. SMARCA4, SMARCA2 and ARID1A mutations were investigated by targeted sequencing. The clinicopathological significance was determined by statistical analysis. Twenty-seven cases (2%) with altered SMARCA4 expression were identified, exhibiting completely lost (six), reduced (nine) or heterogeneous (12) patterns. Frequent concomitant alterations of other SWI/SNF subunits were noted with an unusual discordant spatial heterogeneity. In comparison with SMARCA4-retained GCs, SMARCA4-lost GCs were observed more frequently in the non-EBV/MSI subgroup (five of six) and reduced or heterogeneous SMARCA4 expression mainly occurred in EBV- or MSI-associated cases (six of nine and six of 12, respectively; P < 0.001). Histologically, SMARCA4-altered GC, irrespective of expression pattern, demonstrated divergent histomorphology, spanning tubular, poorly cohesive or mixed, neuroendocrine to solid and undifferentiated carcinoma, with a predilection to the latter two (P < 0.001). De-differentiation-like transition and rhabdoid features were noted in a minority of cases. For overall survival, altered SMARCA4 expression was an unfavourable prognostic factor in stage III, EBV-associated GC and non-EBV/MSI intestinal subtype (P ≤ 0.001). SMARCA4 or ARID1A mutations were detected mainly in SMARCA4-lost or reduced GC, respectively. CONCLUSIONS: SMARCA4-altered GCs are rare and have intratumoral heterogeneity, histomorphological diversity, conditional prognostic significance and various genetic drivers. SMARCA4-lost GC may represent a genuine SMARCA4-deficient neoplasm, but most SMARCA4-reduced/heterogeneous cases are secondary to ARID1A collapse or associated with different genotypes.

Subtraction of Epstein-Barr virus and microsatellite instability genotypes from the Lauren histotypes: Combined molecular and histologic subtyping with clinicopathological and prognostic significance validated in a cohort of 1,248 cases.

Limited studies investigated clinicopathological and prognostic significance of histologic and molecular subgroups of gastric cancer concurrently. We retrospectively enrolled 1,248 patients with gastric cancer who received radical gastrectomy with lymphadenectomy and classified these cases into the Epstein-Barr virus (EBV)-associated and microsatellite instability (MSI)-associated subtypes by EBV-encoded small RNA in situ hybridization and immunohistochemical stains for DNA mismatch repair proteins, respectively. The remaining cases were categorized as the Lauren intestinal and diffuse/mixed subtypes. The clinicopathological and prognostic significance of the subtypes was examined by statistical analysis. In total, 65 (5.2%), 116 (9.3%), 496 (39.7%), 431 (34.5%) and 140 (11.2%) cases were identified as EBV-associated, MSI-associated, intestinal, diffuse and mixed subtypes, respectively. The EBV-associated, MSI-associated, intestinal and diffuse/mixed subtypes exhibited distinctive clinicopathological characteristics, including differences in age, gender, stump cancer, gastric location, tumor size, TNM stage, margin involvement, lymphatic/perineural invasion, HER2 status and recurrence pattern. The log-rank test showed survival discrimination (p < 0.001), and the multivariate analysis identified EBV-associated and MSI-associated cases demonstrated better outcomes than the diffuse/mixed subtype (EBV, HR 0.464, 95% CI 0.296-0.727, p = 0.001; MSI, HR 0.590, 95% CI 0.407-0.856, p = 0.005). EBV-associated lymphoepithelioma-like carcinoma cases had the most favorable outcome (HR 0.138, 95% CI 0.033-0.565, p = 0.006). In different clinical groups, the subtypes exhibited survival discrepancies. The EBV-associated and diffuse/mixed cases exhibited more favorable response to chemotherapy. In conclusion, this combined classification, in parallel with the molecular subtypes specified in the Cancer Genome Atlas study, has implications for the clinical management of gastric cancer.

Adult renal neuroblastoma: A case report and literature review.

RATIONALE: Adult renal neuroblastoma (NB) is extremely rare, and there have been only a few cases previously described in the literature. We report a case of adult renal NB and summarize the clinical and imaging features of the reported cases. PATIENT CONCERNS: A 41-year-old female was admitted to our hospital with a chief complaint of gross hematuria that had persisted for a month. Nonenhanced computed tomography (CT) revealed a hypodense right renal mass without calcification. Enhanced CT showed an infiltrative, heterogeneously enhancing right renal mass with retrocaval lymphadenopathy and right renal vein thrombus. Magnetic resonance imaging (MRI) revealed that the right renal mass was isointense relative to the renal parenchyma on nonenhanced T1-weighted images; it showed mixed hypointensity and hyperintensity on T2-weighted images, and heterogeneous enhancement with a hyperintense rim on fat-saturated, enhanced T1W images. The initial impression was renal cell carcinoma (RCC). DIAGNOSES: Adult renal neuroblastoma. INTERVENTIONS: Right nephroureterectomy with lymph node dissection was performed. The pathology and immunohistochemistry confirmed the diagnosis of renal NB with retrocaval lymphadenopathy and retroperitoneal metastasis. OUTCOMES: After surgery, the patient received 6 courses of chemotherapy, and no recurrence was observed during a 24-month follow-up period. LESSONS: The clinical picture of adult renal NB is that of a 44-year-old woman, presenting with an abdominal or renal mass about 13cm in size, accompanied by hypertension, hematuria, or pain. In contrast to CT features described in previous literature, no tumor calcification is mentioned in these adult renal NB cases. It is difficult to differentiate renal NB from RCC based on CT or MRI. However, biopsy, urinary catecholamine levels, and metaiodobenzylguanidine (MIBG) scan may aid in presurgical diagnosis.

Cytoreductive surgery with hyperthermic intraperitoneal chemotherapy for peritoneal malignancy: preliminary results of a multi-disciplinary teamwork model in Asia.

BACKGROUND: Cytoreductive surgery with hyperthermic intraperitoneal chemotherapy (CRS/HIPEC) is an emerging surgical procedure for peritoneal carcinomatosis (PC). CRS/HIPEC is a complicated treatment that requires multi-disciplinary teamwork (MDT), which may be lacking when establishing a CRS/HIPEC programme. Herein, we report our preliminary treatment outcomes with the early implementation of an MDT model for CRS/HIPEC. METHODS: From April 2015 to December 2016, 45 patients with a diagnosis of PC who received CRS/HIPEC were reviewed retrospectively in a single institution in Taiwan. RESULTS: Among the 45 patients, CRS was mainly performed by laparotomy (n = 42), and only three patients with limited PC underwent laparoscopic CRS. The first 13 patients received treatment before the MDT had been established (group 1), and the other 32 patients were treated after the MDT had been established (group 2). The highest peri-HIPEC body temperature in group 2 was significantly lower than that in group 1 (36.8 °C vs. 37.5 °C, p < 0.001). Overall, eight patients experienced major complications. The trend of a lower major complication rate was observed after the MDT model had been implemented (30.7% in group 1 vs. 12.4% in group 2, p = 0.202). Pre-CRS/HIPEC abdominal pain significantly increased the risk of post-operative major complications (p = 0.017). CONCLUSIONS: Our experience suggests that the early implementation of an MDT model when establishing a CRS/HIPEC programme at a single institution may result in a higher complete cytoreduction rate and lower major complication rate, and also shorten the learning curve of this complicated procedure.

Palliative gastrectomy is beneficial in selected cases of metastatic gastric cancer.

BACKGROUND: Salvage chemotherapy is the mainstay of treatment for metastatic gastric cancer (mGC). This study aimed to clarify the effects of palliative gastrectomy (PG) and identify prognostic factors in mGC patients undergoing PG. METHODS: This was a retrospective review of 333 mGC patients receiving PG or a non-resection procedure (NR) between 2000 and 2010. Clinicopathological factors affecting the prognosis of these patients were collected prospectively and analyzed. RESULTS: One hundred and ninety-three patients underwent PG and 140 NR. The clinicopathological characteristics were comparable between the two groups except for metastatic pattern. There were no significant differences in postoperative morbidity and mortality between the two groups. The PG group had a significantly longer median overall survival compared with the NR group (7.7 months vs. 4.9 months). In the PG group, age ≤58 years, preoperative albumin level >3 g/dL, ratio of metastatic to examined lymph nodes ≤0.58, and administration of chemotherapy were independent prognostic factors in multivariate analysis. CONCLUSIONS: Patients undergoing PG had better outcomes than those undergoing NR. Among the patients undergoing resection, age ≤58 years, a better preoperative nutritional status, less nodal involvement and postoperative chemotherapy independently affected patient survival.

Vascular endothelial growth factor expression is an independent poor prognostic factor for human epidermal growth factor receptor 2 positive gastric cancer.

BACKGROUND: The positive expression of human epidermal growth factor receptor 2 (HER-2) is phenotypically associated with differentiated gastric cancer (GC) and is a prognostic factor for resectable GC. The aim of this study was to explore the clinical significance of vascular endothelial growth factor (VEGF), protein kinase B, and p38 mitogen-activated protein kinase (MAPK) regarding outcome in patients with HER-2 positive GC, and to analyze the relationship between these molecules and clinicopathologic parameters. MATERIALS AND METHODS: Between January 2001 and December 2012, radical-intent gastrectomy specimens from GC patients were evaluated for HER-2 expression by immunohistochemistry (IHC); and with HER-2 expression levels of 2+ were further subjected to fluorescence in situ hybridization analysis. HER-2 positivity was defined by a HER-2 3+ score on IHC or a HER-2 2+ score on IHC and HER-2 amplification by fluorescence in situ hybridization. The expression of VEGF, phosphorylated protein kinase B, and phosphorylated p38 MAPK in HER-2 positive specimens was scored using IHC. RESULTS: Fifty-four patients with HER-2 positive stage I-III GCs were identified. Univariate analysis of prognostic factors showed that tumor differentiation, the presence of vascular invasion, and overexpression of p-p38 MAPK, and VEGF significantly affected prognosis. Multivariate analysis identified vascular invasion (hazard ratio = 2.704; 95% confidence interval = 1.074-7.088; P < 0.033) and the overexpression of VEGF (hazard ratio = 2.760; 95% confidence interval = 1.083-6.753; P < 0.035) to be independent prognostic predictors of HER-2 positive GC. CONCLUSIONS: VEGF overexpression and the presence of vascular invasion were independent poor prognostic factors for HER-2 positive GCs.

Inflammation-induced myeloid-derived suppressor cells associated with squamous cell carcinoma of the head and neck.

BACKGROUND: The purpose of this study was to present our assessment of the significance of myeloid-derived suppressor cells (MDSCs) in head and neck squamous cell carcinoma (HNSCC). METHODS: We examined the percentage of MDSCs in the peripheral blood of patients with HNSCC. The relationship among MDSC recruitment, tumor progression, and cyclooxygenase (COX)-2 inhibition was also evaluated by animal models. RESULTS: Circulating MDSCs were significantly increased in patients with HNSCC compared with healthy people, and this was associated with the clinical tumor burden. In immunocompetent 4-nitroquinoline-1-oxide (4-NQO)-induced oral tumor and immunocompromised tumor implantation animal models, MDSC recruitment was associated with the duration of 4-NQO treatment and tumor progression. The responsible mechanisms included the suppressive ability of T-cell proliferation and augmenting angiogenesis by MDSC. Blockade of COX-2 attenuated the induction and function of MDSCs and subsequently inhibited tumor growth. CONCLUSION: The levels of MDSC are linked with tumor progression in HNSCC. Moreover, targeting COX-2 could be a promising strategy for the treatment of HNSCC. © 2016 Wiley Periodicals, Inc. Head Neck 39: 347-355, 2017.

Alterations of the mTOR pathway in hepatic angiomyolipoma with emphasis on the epithelioid variant and loss of heterogeneity of TSC1/TSC2.

AIMS: To determine the significance of the epithelioid type and the corresponding molecular alterations in hepatic angiomyolipoma (AML). METHODS AND RESULTS: We retrieved 24 samples of hepatic AML to delineate the clinicopathological features and the immunohistochemical expression of components in the mTOR pathway, and employed microsatellite markers to analyse allelic imbalances in the TSC1 and TSC2 regions. Myomatous AML was the most common type, and a predominantly epithelioid cell population was observed in 50% of the samples. Two-thirds of all samples contained <20% of fat tissue. Four cases of monotypic epithelioid AML were discovered without prognostic implications. Elevated phospho-p70S6 kinase expression was noted in 19 samples in the absence of phospho-AKT activity. Loss of heterogeneity (LOH) of TSC1/TSC2 was found in 15 samples. As compared wityh syndromic AML samples, sporadic AML samples showed LOH of microsatellite markers to a limited extent. Only four samples had increased ß-catenin expression in the context of concurrent high expression of phospho-p70S6 kinase and phospho-S6 (P = 0.018). CONCLUSIONS: The low fat content and epithelioid cytomorphology in hepatic AML potentially obstruct preoperative and pathological diagnosis. Alteration of the mTOR pathway and LOH of the tuberous sclerosis complex genes is a frequent pathogenesis in hepatic AMLs.

Desmoplastic sebaceoma arising from nevus sebaceus: a new variant.

Nevus sebaceus is known to have the potential to develop into various secondary tumors. We observed a sebaceoma arising from a nevus sebaceus excised from the left cheek of a 51-year-old woman. This sebaceoma showed desmoplastic change similar to that observed in desmoplastic trichoepithelioma and desmoplastic trichilemmoma. This heretofore undescribed desmoplastic variant of sebaceoma should not be mistaken for invasive sebaceous carcinoma.

Sinonasal pure yolk sac tumor: a case report and literature review.

Extragonadal pure yolk sac tumor of sinonasal origin is very rare. We report herein a case with sinonasal yolk sac tumor in a 1 year and 3 months old girl. The initial complaint was persistent nasal bleeding for about 2 months. Computed tomography (CT) and magnetic resonance imaging (MRI) revealed a lobulated soft tissue mass in paranasal sinus that extended to oral cavity, nasopharynx, and oropharynx. The histology showed typical features of yolk sac tumor and the positive immunohistochemical staining of SALL4 and α-fetoprotein. After tumor excision, adjuvant chemotherapy of JEB regimen was prescribed. After the follow-up for 13-months, α-fetoprotein was normal and neither tumor progression nor metastasis was found. We review the previous literature and discuss the etiology, histology, treatment, and the prognosis of the rare sinonasal yolk sac tumor.

Reappraisal of TLE-1 immunohistochemical staining and molecular detection of SS18-SSX fusion transcripts for synovial sarcoma.

The aim of the present study was to re-evaluate TLE-1 staining and the molecular detection methods of SS18-SSX transcripts for synovial sarcoma. We analyzed TLE-1 expression in 50 molecularly confirmed synovial sarcomas and 85 other soft tissue tumors with three previously published scoring systems. In the present study, 39 to 43 synovial sarcomas showed TLE-1 nuclear staining, whereas 9-15 of 85 other soft tissue tumors showed TLE-1 staining (P < 0.0001). The specificities of strong TLE-1 staining were 100%, 97.6% and 98.8%. The positive likelihood ratio of moderate and strong TLE-1 nuclear expression was >10 in all three scoring systems. There was no difference in TLE-1 staining between different subtypes of synovial sarcoma (P > 0.05). Based on a comparison between conventional reverse transcription (RT)-polymerase chain reaction (PCR) and fluorescence in situ hybridization (FISH), quantitative RT-PCR is a more sensitive method than conventional RT-PCR and FISH to detect t(X;18). A positive correlation between TLE-1 staining and SS18-SSX translocation was detected by conventional PCR (P < 0.05). In conclusion, although all three scoring systems could differentiate synovial sarcoma from other soft tissue tumors, diffuse moderate to severe intensity tumors showed the highest specificity in the diagnosis of synovial sarcoma.

Adenoid basal carcinoma of the uterine cervix: clinicopathologic features of 12 cases with reference to CD117 expression.

Adenoid basal carcinoma is a rare tumor of the uterine cervix. Less than 100 cases have been documented thus far, and only a few cases have been reported among the Asian population. An important differential diagnosis is cervical adenoid cystic carcinoma because of their overlapping morphologic appearances but absolutely different clinical outcomes. The treatment of adenoid basal carcinoma should be conservative due to its generally benign behavior. CD117 (c-kit) have been recently found immunohistochemically positive for adenoid cystic carcinomas of other anatomic locations and may serve as a useful ancillary differential marker. CD117 expression for adenoid cystic carcinoma and adenoid basal carcinoma of the uterine cervix has never been evaluated. We report the clinicopathologic features of 12 adenoid basal carcinomas with reference to CD117 expression, which represent the largest series from the Asian population. All typical adenoid basal carcinomas are negative for CD117 or have only an equivocal staining intensity. In contrast, 1 adenoid cystic carcinoma and 1 mixed adenoid basal/cystic carcinoma of the uterine cervix are positive for CD117. CD117 may be of value in differential diagnosis between these 2 entities and guide follow-up and treatment program. Further investigation of CD117 expression in a larger series of adenoid cystic carcinoma of the uterine cervix is needed to validate this notion.