Feasibility of intraoperative pathologic examination for sentinel lymph nodes during sentinel node navigation surgery in early gastric cancer: results of pathologic protocol for SENORITA trial.

BACKGROUND: During sentinel node navigation surgery in patients with gastric cancer, intraoperative pathologic examination of sentinel nodes is crucial in determining the extent of surgery. In this study, we evaluated the feasibility and accuracy of intraoperative pathologic protocols using data from a prospective, multicenter, randomized trial. METHODS: A retrospective analysis was conducted using data from the SEntinel Node ORIented Tailored Approach trials from 2013 to 2016. All sentinel lymph nodes were evaluated during surgery with hematoxylin-eosin (HE) staining using a representative section at the largest plane for lymph nodes. For permanent histologic evaluation, sentinel basin nodes were stained with HE and cytokeratin immunohistochemistry in formalin-fixed, paraffin-embedded (FFPE) sections and examined with HE for three deeper-step sections at 200-µm intervals. The failure rate of identification by frozen section and the metastasis rate in non-sentinel basins were investigated. RESULTS: Of the 237 patients who underwent sentinel node basin dissection, 30 had lymph node metastases on permanent pathology. Thirteen patients had macrometastasis confirmed in frozen sections as well as FFPE sections (failure rate: 0%). Patients with negative sentinel nodes in frozen sections but micrometastasis in FFPE sections had no lymph node recurrence during the follow-up period (0%, 0/6). However, in cases with tumor-positive nodes in frozen sections, metastases in non-sentinel basins were detected in the paraffin blocks (8.3%, 2/24). CONCLUSIONS: The single-section HE staining method is sufficient for detecting macrometastasis via intraoperative pathological examination. If a negative frozen-section result is confirmed, sentinel basin dissection can be performed safely. Otherwise, standard surgery is required.

Carcinoma ex pleomorphic adenoma of the parotid gland.

INTRODUCTION: Carcinoma ex pleomorphic adenoma (CXPA) is a rare malignant tumor of the parotid gland. We analyzed the clinical characteristics and treatment outcomes of CXPA of the parotid gland in patients managed for 11 years at this hospital. METHODS: The study included 17 cases of CXPA of the parotid gland from January 2010 to December 2020. RESULTS: Over 11 years, CXPA was the fourth most common parotid carcinoma, accounting for 9.4% of the 180 cases finally diagnosed as parotid carcinoma. Of the 17 cases of CXPA of the parotid gland, 12 lesions were removed by superficial parotidectomy, four lesions by total parotidectomy, and one lesion by radical parotidectomy. Four patients underwent neck dissection. The most common histopathology type was salivary duct carcinoma (n = 13, 76.5%). Postoperative radiation therapy (RT) was performed in 15 patients. Two patients (11.8%) experienced CXPA recurrence 14 and 19 months after surgery. CONCLUSION: CXPA of the parotid gland was treated without recurrence in about 90% of the patients through surgery and postoperative RT. In the case of frankly invasive or adverse factors in the histopathological examination, more attention is required because CXPA recurrence may occur more frequently.

Fibroblast growth factor receptor 4 increases epidermal growth factor receptor (EGFR) signaling by inducing amphiregulin expression and attenuates response to EGFR inhibitors in colon cancer.

Fibroblast growth factor receptor 4 (FGFR4) is known to induce cancer cell proliferation, invasion, and antiapoptosis through activation of RAS/RAF/ERK and PI3K/AKT pathways, which are also known as major molecular bases of colon cancer carcinogenesis related with epidermal growth factor receptor (EGFR) signaling. However, the interaction between FGFR4 and EGFR signaling in regard to colon cancer progression is unclear. Here, we investigated a potential cross-talk between FGFR4 and EGFR, and the effect of anti-EGFR therapy in colon cancer treatment. To explore the biological roles of FGFR4 in cancer progression, RNA sequencing was carried out using FGFR4 transfected colon cell lines. Gene ontology data showed the upregulation of genes related to EGFR signaling, and we identified that FGFR4 overexpression secretes EGFR ligands such as amphiregulin (AREG) with consequent activation of EGFR and ErbB3. This result was also shown in in vivo study and the cooperative interaction between EGFR and FGFR4 promoted tumor growth. In addition, FGFR4 overexpression reduced cetuximab-induced cytotoxicity and the combination of FGFR4 inhibitor (BLU9931) and cetuximab showed profound antitumor effect compared to cetuximab alone. Clinically, we found the positive correlation between FGFR4 and AREG expression in tumor tissue, but not in normal tissue, from colon cancer patients and these expressions were significantly correlated with poor overall survival in patients treated with cetuximab. Therefore, our results provide the novel mechanism of FGFR4 in connection with EGFR activation and the combination of FGFR4 inhibitor and cetuximab could be a promising therapeutic option to achieve the optimal response to anti-EGFR therapy in colon cancer.

Recurrent KRAS mutations identified in papillary renal neoplasm with reverse polarity-a comparative study with papillary renal cell carcinoma.

Comprehensive molecular analyses revealed that papillary renal cell carcinoma (PRCC) is a heterogenous entity. Papillary renal neoplasm with reverse polarity (PRNRP) is a subset of PRCC with characteristic histomorphologies such as low-grade nuclear features, inverted nuclear location, eosinophilic cytoplasm, and indolent clinical behavior. We tried to define the molecular, clinicopathological, histologic, and immunohistochemical features of PRNRP by comparing them with type 1 PRCC (PRCC1) and type 2 PRCC (PRCC2). A cohort of 30 PRNRP, 23 PRCC1, and 26 PRCC2 cases was used. Targeted sequencing of 90 cancer-related genes including KRAS was performed in 26 PRNRP tumor samples. PNA-mediated clamping PCR of KRAS was performed using paired normal and tumor DNA from 30 PRNRP, 23 PRCC1, and 26 PRCC2 cases. Tissue microarray slides were made in three cores per tumor, which were stained with cytokeratin 7 (CK7), alpha-methylacyl-CoA racemase (AMACR), epithelial membrane antigen (EMA), E-cadherin, vimentin, and CD10. Recurrent mutations in KRAS were detected in 28 of the 30 PRNRPs. However, there were no KRAS mutations in any PRCC1 or PRCC2 cases. PRNRP exhibited distinct clinicopathological features: small tumor size, lower pathologic T stage, and no disease-specific death during the follow-up period. Histologically, peritumoral lymphoid aggregation, prominent papillary architecture (>80% of tumor), hyalinized papillae, inverted nuclear location, and lower nuclear grade were observed. PRNRP was usually positive for CK7, AMACR, EMA, and E-cadherin, and negative for CD10. The findings suggest that PRNRP is a subtype of papillary renal neoplasm that is different from PRCC1 or PRCC2 in terms of molecular, clinicopathological, histological, and immunohistochemical features.

A Huge Ancient Schwannoma of the Epiglottis.

Ancient schwannoma of the epiglottis is extremely rare. The authors report the first case of a patient with a huge ancient schwannoma of the epiglottis. Clinicians should consider the possibility that ancient schwannoma may originate in the epiglottis mimicking the other more frequently observed lesions.

Genomic evidence of reactive oxygen species elevation in papillary thyroid carcinoma with Hashimoto thyroiditis.

Elevated levels of reactive oxygen species (ROS) have been proposed as a risk factor for the development of papillary thyroid carcinoma (PTC) in patients with Hashimoto thyroiditis (HT). However, it has yet to be proven that the total levels of ROS are sufficiently increased to contribute to carcinogenesis. We hypothesized that if the ROS levels were increased in HT, ROS-related genes would also be differently expressed in PTC with HT. To find differentially expressed genes (DEGs) we analyzed data from the Cancer Genomic Atlas, gene expression data from RNA sequencing: 33 from normal thyroid tissue, 232 from PTC without HT, and 60 from PTC with HT. We prepared 402 ROS-related genes from three gene sets by genomic database searching. We also analyzed a public microarray data to validate our results. Thirty-three ROS related genes were up-regulated in PTC with HT, whereas there were only nine genes in PTC without HT (Chi-square p-value < 0.001). Mean log2 fold changes of up-regulated genes was 0.562 in HT group and 0.252 in PTC without HT group (t-test p-value = 0.001). In microarray data analysis, 12 of 32 ROS-related genes showed the same differential expression pattern with statistical significance. In gene ontology analysis, up-regulated ROS-related genes were related with ROS metabolism and apoptosis. Immune function-related and carcinogenesis-related gene sets were enriched only in HT group in Gene Set Enrichment Analysis. Our results suggested that ROS levels may be increased in PTC with HT. Increased levels of ROS may contribute to PTC development in patients with HT.

Giant cell tumor with secondary aneurysmal bone cyst: a unique presentation with an ossified extraosseous soft tissue mass.

The authors describe a case of giant cell tumor (GCT) with secondary aneurysmal bone cyst (ABC) in a 44-year-old man with chronic, intermittent knee pain. A unique feature is the presentation of GCT with an ossified extraosseous soft tissue mass. Radiograph demonstrates a multiloculated lytic lesion in the distal meta-epiphyseal region of the femur with an adjacent extraosseous soft tissue mass. The soft tissue mass was partially ossified along its margin and internal septa. MRI demonstrates a multiloculated lesion in the distal femur with multiple fluid-fluid levels and cortical penetration of the lesion. Both the intraosseous lesion and extraosseous soft tissue mass have similar MR signal characteristics. At surgery, the intraosseous component was found to be contiguous with the extraosseous soft tissue mass through a cortical perforation. To the best of our knowledge, this is the first case report of GCT with aneurysmal bone cyst initially presenting with an extraosseous soft tissue mass.

The Effect of Metformin Treatment on CRBP-I Level and Cancer Development in the Liver of HBx Transgenic Mice.

Retinoids regulate not only various cell functions including proliferation and differentiation but also glucose and lipid metabolism. After we observed a marked up-regulation of cellular retinol-binding protein-I (CRBP-I) in the liver of hepatitis B virus x antigen (HBx)-transgenic (HBx Tg) mice which are prone to hepatocellular carcinoma (HCC) and fatty liver, we aimed to evaluate retinoid pathway, including genes for the retinoid physiology, CRBP-I protein expression, and retinoid levels, in the liver of HBx Tg mice. We also assessed the effect of chronic metformin treatment on HCC development in the mice. Many genes involved in hepatic retinoid physiology, including CRBP-I, were altered and the tissue levels of retinol and all-trans retinoic acid (ATRA) were elevated in the liver of HBx Tg mice compared to those of wild type (WT) control mice. CRBP-I protein expression in liver, but not in white adipose tissue, of HBx Tg mice was significantly elevated compared to WT control mice while CRBP-I protein expressions in the liver and WAT of high-fat fed obese and db/db mice were comparable to WT control mice. Chronic treatment of HBx Tg mice with metformin did not affect the incidence of HCC, but slightly increased hepatic CRBP-I level. In conclusion, hepatic CRBP-I level was markedly up-regulated in HCC-prone HBx Tg mice and neither hepatic CRBP-I nor the development of HCC was suppressed by metformin treatment.

Metastasis of Sublingual Gland Adenoid Cystic Carcinoma to the Upper Gingiva.

Adenoid cystic carcinoma (ACC) of the sublingual gland is rare. There are no previous reports of the metastasis of sublingual gland ACC to the upper gingiva. Herein, we report the first case of a patient with metastasis of sublingual gland ACC to the upper gingiva. It should be recognized that although metastasis of sublingual gland ACC to the upper gingiva is very rare, it can occur.

Metastasis of parotid adenocarcinoma to the external auditory canal.

Metastatic carcinoma of the external auditory canal (EAC) is extremely rare. Herein, we report the first case of a patient with metastasis of parotid adenocarcinoma to the EAC. Clinicians should include it in the differential diagnosis of tumors of the EAC. In patients with parotid carcinoma, a physical examination of the entire head and neck, including the EAC, should be performed before surgery.

Sellar plasmacytoma with massive bleeding during surgery.

Plasmacytoma in the sellar region is an extremely rare occurrence. Sellar plasmacytoma is often difficult to differentiate from pituitary tumors both clinically and radiologically. The occurrence of cranial nerve palsy, the preservation of pituitary hormone function, the presence of sellar floor destruction, and better contrast enhancement are regarded as the differentiating factors between sellar plasmacytoma and pituitary tumors. We recommend adding the massive bleeding properties of sellar plasmacytoma as another characteristic which differentiates it from a pituitary tumor.

Sinonasal teratocarcinosarcoma with rhabdoid features.

Sinonasal teratocarcinosarcoma (SNTCS) is a very rare tumor developed in the nasal cavity and paranasal sinuses. The rhabdoid phenotype represents an aggressive biological behavior, but the rhabdoid feature has hitherto not been reported in cases of SNTCS. A 46-year-old man complained of a 1-month history of left-sided nasal obstruction. Computed tomography scan and magnetic resonance imaging showed a tumor mass involving the left nasal cavity, ethmoid sinus, and ethmoid bone with extension to the left frontal lobe of the brain. A gross total resection of the mass was performed and postoperative radiation therapy administered. Seven weeks later, several recurring masses were detected in the left frontotemporal lobe of the brain. A gross total resection of the mass was performed and postoperative chemotherapy administered. Histopathologically, the tumor showed benign and malignant epithelial, mesenchymal, neural, and immature elements. In addition, diffuse sheets of rhabdoid cells were immunopositive for vimentin, nestin, neuron-specific enolase, and INI1. Ultrastructurally, rhabdoid cells showed paranuclear aggregates and whorls of intermediate filaments with a 9-10 nm diameter. In conclusion, we report first case of rhabdoid features in SNTCS. The present case showed an advanced stage and early recurrence; the rhabdoid component was probably responsible for this aggressive behavior.

Mucin-positive epithelial mesothelioma of the peritoneum: small bowel involvement.

Mucin-positive epithelial mesothelioma has been reported in the peritoneum only once, and that mainly involved the stomach wall. We report the second peritoneal case and this is the first case mainly involving the small bowel wall. A 65-year-old man showed diffuse involvement from the duodenum to the ileum and metastatic masses in the left adrenal gland. Segmental resection of the small bowel was performed; 2 months later the patient died. Light microscopy showed diffusely anaplastic epithelioid cell proliferation and foci of glandular formation with granular mucinous materials in the cytoplasmic vacuoles or within glandular lumina. Histochemically, these mucin materials were PAS-positive and diastase-resistant. Immunohistochemically, the various mesothelial markers were positive, and a few adenocarcinoma markers were focally positive. Ultrastructurally, the tumor cells showed long slender microvilli on the apical surface, consistent with mesothelioma. Electron microscopy can play a decisive role in the case of ambiguous histochemical and immunohistochemical results.

Utility of napsin A and thyroid transcription factor 1 in differentiating metastatic pulmonary from non-pulmonary adenocarcinoma in pleural effusion.

OBJECTIVE: It was our aim to evaluate the usefulness of napsin A and thyroid transcription factor 1 (TTF-1) in the differential diagnosis of metastatic pulmonary and non-pulmonary adenocarcinomas (ACs) in pleural effusion. STUDY DESIGN: A total of 84 pleural effusion fluid cell blocks were collected from metastatic ACs. There were 53 pulmonary ACs and 31 non-pulmonary ACs. Immunohistochemical staining was performed with antibodies against napsin A and TTF-1. RESULTS: Napsin A was positive in 44/53 (83%) cases of pulmonary ACs, and TTF-1 was positive in 30/53 (57%) cases of pulmonary ACs. All non-pulmonary ACs were negative for napsin A and TTF-1. Napsin A showed a reactivity in >75% of the tumor cells in 36 of the 44 positive cases (82%), whereas TTF-1 showed a reactivity in >75% of the tumor cells only in 6 of the 30 positive cases (20%; p < 0.01). Poorly differentiated pulmonary ACs expressed napsin A (73%) more frequently than TTF-1 (53%), but this was not statistically significant (p = 0.45). CONCLUSION: We conclude that napsin A is superior to TTF-1 with regard to distinguishing between metastatic pulmonary and non-pulmonary ACs in cell blocks prepared from malignant pleural effusions.

Assessment of DNA methylation for the detection of cervical neoplasia in liquid-based cytology specimens.

OBJECTIVE: DNA methylation is an early event in carcinogenesis. Testing for DNA methylation has potential in cancer screening. The aim of this study was to investigate the feasibility of methylated DNA detection as a screening tool for squamous cell carcinomas (SCC) and squamous intraepithelial lesions (SIL) in cervical scrapings. METHODS: A multiplex, nested, methylation-specific polymerase chain reaction approach was used to examine promoter methylation of 12 genes (CDH1, DAPK, GSTP1, HIC-1, HIN-1, hMLH1, MGMT, p16, RAR-beta, RASSF1A, SHP-1, and Twist) in biopsy-proven SCC (n=69), high-grade SIL (HSIL, n=67), low-grade SIL (LSIL, n=32), and negative (n=41) liquid-based cytology samples. RESULTS: The methylation frequency in normal, LSIL, HSIL, and SCC was significantly different (p<0.01) for eight genes (DAPK, HIC-1, HIN-1, MGMT, RAR-beta, RASSF1A, SHP-1, and Twist). There was a trend toward increasing methylation of HIN-1, MGMT, RAR-beta, RASSF1A, and SHP-1 with increasing severity of cervical squamous lesions. The number of methylated genes increased with the severity of cervical squamous lesions (p<0.001). In receiver-operating characteristic analysis, the three-gene combination (RAR-beta/Twist/MGMT) showed the best performance to distinguish HSIL/SCC from LCIS/negative samples. The estimated specificity of this three-gene panel for detecting HSIL/SCC was 82.2%, and its sensitivity was 78.7%. CONCLUSION: Although aberrant DNA methylation has the potential to function as a molecular biomarker of HSIL and SCC in liquid-based cytology tests, additional genes that are selectively methylated in HSIL and SCC are needed to improve clinical performance.

Evaluation of promoter hypermethylation detection in serum as a diagnostic tool for breast carcinoma in Korean women.

OBJECTIVE: We have noted that quantitative multiplex-methylation specific PCR (QM-MSP) analysis of a key panel of genes may be useful as an ancillary tool for ductal carcinoma in situ (DCIS) detection in breast tissue. In this study, we investigated aberrant promoter hypermethylation of four genes as a means to detect epigenetic alterations specific to breast carcinoma in the serum of patients with DCIS and invasive ductal carcinoma (IDC). METHODS: Two hundred forty-three serum samples from 89 patients with IDC, 30 patients with DCIS, and 125 age-matched healthy controls were examined. After DNA extraction and sodium bisulfite treatment, QM-MSP was performed for HIN-1, RASSF1A, RAR-beta, and Twist. RESULTS: Overall significant differences in methylation levels were observed for HIN-1 (p=0.006), RAR-beta (p<0.001), RASSF1A (p=0.004), and Twist (p<0.001). All four genes showed significantly higher methylation frequencies in DCIS or IDC than in control subjects (p<0.001 for all comparisons). However, methylation frequencies were not significantly different between DCIS and IDC. In receiver-operating characteristic analysis, the two-gene combination (RAR-beta/RASSF1A) showed the best performance in distinguishing DCIS/IDC from control samples. The estimated specificity of this two-gene panel for detecting DCIS/IDC was 88.8%, and its sensitivity was 94.1%. CONCLUSIONS: The quantitative detection of aberrant DNA methylation in serum samples may be a promising high throughput approach for the diagnosis of breast cancer including DCIS.

Utility of thyroid transcription factor-1 and CDX-2 in determining the primary site of metastatic adenocarcinomas in serous effusions.

OBJECTIVE: To evaluate the usefulness of thyroid transcription factor-1 (TTF-1) and CDX-2 in determining the primary tumor site of metastatic adenocarcinomas (ACs) in serous effusions. STUDY DESIGN: Cell blocks were constructed from cells in metastatic AC effusion fluids (n = 97) that had been previously stained with a panel of antibodies against MOC-31, D2-40 and calretinin. Primary tumor sites included the lungs (n = 52), ovaries (n = 6), pancreas (n = 4), breasts (n = 3), bile duct (n = 2) and gastrointestinal (GI) tract (30), including stomach (n = 28) and colon (n = 2). Primary sites were determined by tissue confirmation of the original tumor or review of the clinical charts. Immunocytochemical staining was performed with antibodies against TTF-1 and CDX-2. RESULTS: The lung ACs showed TTF-1 positivity in 58% (30/52) of cases. All nonpulmonary ACs lacked TTF-1 staining. Among the 30 GI ACs, 9 (30%) (7 from the stomach and 2 from the colon) showed CDX-2 positivity. All non-GI ACs lacked CDX-2 staining. Specificities and positive predictive values for TTF-1 and CDX-2 equaled 100% for metastatic pulmonary and GI ACs, respectively. CONCLUSION: Our results suggested that TTF-1 and CDX-2 are specific markers to separate metastatic pulmonary and GI ACs, respectively, from other metastatic ACs in serous effusions. However, sensitivity values of these markers were low.

Metastatic small cell neuroendocrine carcinoma of the submandibular gland from the lung: A case report.

RATIONALE: Small cell neuroendocrine carcinoma of the salivary gland is an extremely rare condition. To the best of our knowledge, metastasis of small cell neuroendocrine lung cancer to the submandibular gland has not been reported in the literature. PATIENT CONCERN: An 87-year-old female complained of a left neck mass that enlarged from one month ago. DIAGNOSIS: The final diagnosis was diagnosed as a metastatic small cell neuroendocrine carcinoma of the submandibular gland from lung by an immunohistochemistry. INTERVENTIONS: Left submandibular resection was performed under general anesthesia. OUTCOMES: We recommended further evaluation and treatment, but the patient and patient family support team rejected further treatment of her condition. It was confirmed that 3 months after this conclusive diagnosis, the patient died as a result of this condition and disease. LESSONS: Small cell neuroendocrine carcinoma of the salivary gland is an extremely rare condition. We report a case of metastatic small cell neuroendocrine carcinoma of the submandibular gland from the lung.

Ultrastructural Dendritic Changes Underlying Diaschisis After Capsular Infarct.

Diaschisis has been described as functional depression distant to the lesion. A variety of neuroscientific approaches have been used to investigate the mechanisms underlying diaschisis. However, few studies have examined the pathological changes in diaschisis at ultrastructural level. Here, we used a rat model of capsular infarct that consistently produces diaschisis in ipsilesional and contralesional motor and sensory cortices. To verify the occurrence of diaschisis and monitor time-dependent changes in diaschisis, we performed longitudinal 2-deoxy-2-[18F]-fluoro-d-glucose microPET (FDG-microPET) study. We also used light and electron microscopy to identify the microscopic and ultrastructural changes at the diaschisis site at 7, 14, and 21 days after capsular infarct modeling (CIM). FDG-microPET showed the occurrence of diaschisis after CIM. Light microscopic examinations revealed no significant histopathological changes at the diaschisis site except a mild degree of reactive astrogliosis. However, electron microscopy revealed swollen, hydropic degeneration of axial dendrites and axodendritic synapses, although the neuronal soma (including nuclear chromatin and cytoplasmic organelles) and myelinated axons were relatively well preserved up to 21 days after injury. Furthermore, number of axodendritic synapses was significantly decreased after CIM. These data indicate that a circumscribed subcortical white-matter lesion produces ultrastructural pathological changes related to the pathogenesis of diaschisis.