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Low-grade small round cell tumor of the cauda equina with EWSR1-WT1 fusion and indolent clinical course.
We report a case of a longstanding, large tumor involving spinal nerve roots of the cauda equina. The tumor showed small round cells arranged in nests and cords and immunophenotypic features of a glomus tumor, along with infrequent mitoses and a low Ki-67 labeling index, but exhibited some rosette-l...
Classification of microvascular patterns via cluster analysis reveals their prognostic significance in glioblastoma.
We evaluated MVPs of 78 glioblastomas by CD34/periodic acid-Schiff dual staining and by cluster analysis of the percentage of microvascular area for distinct microvascular formations. The distribution of 5 types of basic microvascular formations, that is, microvascular sprouting (MS), vascular clust...
Variant of prostatic adenocarcinoma with Paneth cell-like neuroendocrine differentiation readily misdiagnosed as Gleason pattern 5.
This study focused on 11 cases of prostatic adenocarcinoma with Paneth cell-like change, which had sparse to no Paneth cell-like granules; grading the tumor conventionally would have resulted in assigning a Gleason pattern 5 for the primary or secondary pattern. Ten cases were entirely composed of t...
Thymic neuroendocrine tumors (paraganglioma and carcinoid tumors): a comparative immunohistochemical study of 46 cases.
Twenty-two paragangliomas from different anatomical sites and 24 thymic neuroendocrine carcinomas (carcinoid tumors) were analyzed for traditional and novel immunohistochemical markers. In the paraganglioma group, there were 8 men and 14 women between the ages of 23 and 79 years (mean, 46 years). Th...
Immunohistochemical detection of ARID1A in colorectal carcinoma: loss of staining is associated with sporadic microsatellite unstable tumors...
We analyzed the immunohistochemical expression of ARID1A in a consecutive series of 257 CRCs that fulfilled a set of relaxed criteria for Lynch syndrome screening; 59 (23%) were MMR deficient by immunohistochemistry (44 MLH1/PMS2 deficient, 9 MSH2/MSH6 deficient, 4 MSH6 deficient, and 2 PMS2 deficie...
Significance of signet ring cells in high-grade mucinous adenocarcinoma of the peritoneum from appendiceal origin.
We retrospectively reviewed cases of mucinous adenocarcinoma of the peritoneum from appendiceal origin (n = 55) and collected clinical follow-up data. Signet ring cells were identified in 29 of 55 cases. No low-grade mucinous adenocarcinoma case (n = 11) had signet ring cells, whereas 29 of 44 high-...
Clinicopathological analysis of intraductal proliferative lesions of prostate: intraductal carcinoma of prostate, high-grade prostatic intra...
We evaluated the relationship between these intraductal proliferative lesions and clinicopathological parameters. In this study, ACLs were characterized as a loose cribriform intraductal proliferation with greater architectural complexity when compared to HGPIN, but lacking significant nuclear pleom...
Frameshift mutation of a histone methylation-related gene SETD1B and its regional heterogeneity in gastric and colorectal cancers with high ...
We found that SETD1B, SETDB2, and SETD2 had mononucleotide repeats in coding sequences that might be mutation targets in cancers with microsatellite instability (MSI). We analyzed the mutations in 76 GCs and 93 CRCs and found SETD1B (38.7% of GC and 35.6% of CRC with high MSI [MSI-H]), SETDB2 (11.1%...
Frequent hepatocyte growth factor overexpression and low frequency of c-Met gene amplification in human papillomavirus-negative tonsillar sq...
We therefore investigated the prognostic values of HGF and c-Met expression in TSCC according to HPV status. Immunohistochemical analyses of HGF and c-Met protein expression and silver in situ hybridization of c-Met gene copy number were performed in 79 formalin-fixed, paraffin-embedded specimens. I...
Combination of hepatocellular markers is useful for prognostication in gastric hepatoid adenocarcinoma.
We immunohistochemically analyzed hepatocellular markers (AFP, glypican 3, and Hepatocyte paraffin 1 [HepPar-1]) and possible markers of gastric hepatoid adenocarcinoma (Sal-like protein 4 [SALL4] and palate, lung, and nasal epithelium carcinoma-associated protein [PLUNC]) to detect hepatoid differe...