The True History of Cementoblastoma.

REVIEW OF THE LITERATURE: Cementoblastoma (CB) is unique among odontogenic tumors because its gross pathological anatomy is pathognomonic in most cases, i.e., a rounded calcified growth that is fused to the root of a tooth and completely encapsulated by fibrous tissue. The resulting radiographic appearance is a well-defined, globular mixed radiopaque/lucent or completely radiopaque mass obliterating some details of the root, with a thin radiolucent zone surrounding the central opacity. Although hundreds of publications have covered the clinicopathologic features of CB, almost nothing is known about its true history. Also it seems there is little understanding about how the term "CB" was originally introduced as a pathologic entity. This report covers some overlooked papers on CB dating back to the 19th century, including the first complete description in 1888 and the first radiographic presentation in 1906.

Safety Profile of Ixazomib in Patients with Relapsed/Refractory Multiple Myeloma in Japan: An All-case Post-marketing Surveillance.

Objective To evaluate the safety profile of ixazomib combined with lenalidomide and dexamethasone in patients with relapsed/refractory multiple myeloma (RRMM) in clinical practice in Japan through an all-case post-marketing surveillance. Methods This was a nationwide non-interventional observational study conducted in Japan. The study included all patients who received ixazomib from May 24 to September 24, 2017. Ixazomib was administered to RRMM patients according to the Japanese package insert. All enrolled patients were observed until the completion of the sixth treatment cycle or until ixazomib discontinuation. The patient treatment course, including adverse events (AEs), was reported. Results The safety analysis set included 741 patients; the median age was 71 (range 35-92) years old, and the median number of prior treatment lines was 3 (range 1-30). Adverse drug reactions (ADRs) occurred in 572 (77.2%) patients, most commonly being thrombocytopenia (49.9%), diarrhea (29.2%), and nausea (12.4%). Serious ADRs occurred in 193 (26.0%) patients, most commonly being thrombocytopenia (9.9%) and diarrhea (5.9%). Thrombocytopenia, severe gastrointestinal disorders, infections, skin disorders, and peripheral neuropathy were prespecified as ADRs of clinical importance; the frequency of these ADRs (grade ≥3) were 28.5%, 9.4%, 7.4%, 2.2%, and 1.3%, respectively. Treatment discontinuation was most common with thrombocytopenia and severe gastrointestinal disorders (49 and 43 patients, respectively). Eleven patients died due to ADRs (16 events). Conclusion These results suggest that ixazomib has a tolerable safety profile in clinical practice in Japan. However, close AE management for thrombocytopenia and gastrointestinal disorders should be considered.

A Case of Buccal Clear Cell Carcinoma Caused by Rare Fusion Gene: EWSR1-CREM.

Clear cell carcinoma (CCC) is a rare entity in the salivary gland tumor. So far, only 10 cases of primary CCC of the buccal mucosa have been reported. Here, we first report an extremely rare case of buccal CCC with the EWSR1-CREM fusion gene. The patient, a 69-year-old woman, presented with a painless mass in the right buccal mucosa. The tumor, which had been present for about 10 years, measured approximately 15 mm in diameter and was pedunculated, elastic hard, smooth, and mobile. Histopathological examination revealed proliferating tumor cells with vacuolated and clear cytoplasm partially surrounded by hyalinized stroma. The tumor was not encapsulated, and no contact with the overlying epithelium was evident. Duct-like structures were occasionally observed in the tumor nests composed of clear cells. The tumor had invaded into surrounding muscle and adipose tissues. Immunohistochemical examination revealed that the clear cells were positive for epithelial cell markers, and myoepithelial markers were negative. Fluorescence in situ hybridization (FISH), performed to search for genetic abnormalities, demonstrated split positivity for EWSR1, and fusion with CREM was confirmed. These findings suggested a diagnosis of CCC.

Safety profile of brentuximab vedotin in Japanese patients with relapsed/refractory Hodgkin lymphoma or systemic anaplastic large cell lymphoma: a post-marketing surveillance study.

Brentuximab vedotin (BV) was initially approved in Japan for the treatment of relapsed/refractory (R/R) CD30-positive Hodgkin lymphoma (HL) and systemic anaplastic large cell lymphoma (sALCL). As requested by the Japanese Ministry of Health, Labour and Welfare, we conducted a post-marketing surveillance (PMS) study to assess the safety of BV in Japanese patients with R/R HL or sALCL. PMS forms were collected from 284 patients (182 with HL, 101 with sALCL and one with another lymphoma) treated between April and September 2014. The median age was 62 (range 14-93) years and the median number of treatment cycles was 5.5 for HL and 4 for sALCL. Adverse drug reactions (ADRs) were reported in 74.3% of patients. The most commonly observed ADRs included peripheral sensory neuropathy (39.1%; grade ≥ 3, 6.3%), neutropenia (34.5%; grade ≥ 3, 22.2%) and lymphopenia (7.0%; grade ≥ 3, 5.3%). Ten patients had fatal ADRs including interstitial lung disease (n = 3). This study showed that BV has an acceptable safety profile in Japanese patients with R/R HL and R/R sALCL in the clinical practice setting. However, close monitoring rare, but potentially fatal, ADRs such as pulmonary toxicity may be warranted, especially in patients with prior or ongoing pulmonary disorders.

Primary intestinal-type adenocarcinoma of the buccal mucosa: A case report and literature review.

Intestinal-type adenocarcinoma of the primary salivary glands is extremely rare. So far, only 11 cases of primary intestinal-type adenocarcinoma of the oral cavity and major salivary glands have been reported. Two of those tumors arose in the floor of mouth, 7 in the tongue, and 2 in the major salivary glands. However, it has remained unclear whether these tumors are derived from mature salivary glands, and primary intestinal-type adenocarcinoma of the buccal mucosa has not been reported previously. Here, we present the first documented case of primary intestinal-type adenocarcinoma arising in a minor salivary gland of the buccal mucosa. Histopathologically, the tumor resembled a well-differentiated or mucinous colonic adenocarcinoma. Immunohistochemically, the tumor cells were diffusely positive for AE1/AE3, CAM5.2, CK7, SATB2, ß-catenin, p53, Ki-67, MUC2, and MUC5 AC. CK14 and CK20 were positive in some of the tumor cells. CDX2, CA19-9, SP-A, TTF-1, PSA, SMA, p63, and cyclin D1 were negative in the tumor cells. The tumor in the present case may have originated from salivary gland duct epithelium that underwent transformation to phenotypic intestinal-type epithelium. In this very rare case of primary intestinal-type adenocarcinoma of the buccal mucosa, we considered diagnostic markers that could be indicative of mature salivary gland origin.

Detection of Epstein-Barr virus genome and latent infection gene expression in normal epithelia, epithelial dysplasia, and squamous cell carcinoma of the oral cavity.

A relationship between Epstein-Barr virus (EBV) infection and cancer of lymphoid and epithelial tissues such as Burkitt's lymphoma, Hodgkin's disease, nasopharyngeal carcinoma (NPC), gastric carcinoma, and oral cancer has been reported. EBV is transmitted orally and infects B cells and epithelial cells. However, it has remained uncertain whether EBV plays a role in carcinogenesis of oral mucosal tissue. In the present study, we detected the EBV genome and latent EBV gene expression in normal mucosal epithelia, epithelial dysplasia, and oral squamous cell carcinoma (OSCC) to clarify whether EBV is involved in carcinogenesis of the oral cavity. We examined 333 formalin-fixed, paraffin-embedded tissue samples (morphologically normal oral mucosa 30 samples, gingivitis 32, tonsillitis 17, oral epithelial dysplasia 83, OSCC 150, and NPC 21). EBV latent infection genes (EBNA-2, LMP-1) were detected not only in OSCC (50.2 %, 10.7 %) but also in severe epithelial dysplasia (66.7 %, 44.4 %), mild to moderate epithelial dysplasia (43.1 %, 18.5 %), gingivitis (78.1 %, 21.9 %), and normal mucosa (83.3 %, 23.3 %). Furthermore, the intensity of EBV latent infection gene expression (EBER, LMP-1) was significantly higher in severe epithelial dysplasia (94.4 %, 72.2 %) than in OSCC (34.7 %, 38.7 %). These results suggest that EBV latent infection genes and their increased expression in severe epithelial dysplasia might play an important role in the dysplasia-carcinoma sequence in the oral cavity.

Comparative study of cytokeratin and langerin expression in keratinized cystic lesions of the oral and maxillofacial regions.

Dermoid cysts (DMCs) and epidermoid cysts (EDMCs) usually arise in soft tissues, whereas orthokeratinized odontogenic cysts (OOCs) and keratocystic odontogenic tumors (KCOTs) develop in the jaw. In this study, we performed immunohistochemical analysis of cytokeratins (CKs) to examine differences in the lining epithelium of DMCs, EDMCs, OOCs, and KCOTs. In addition, we carried out immunohistochemical examination of langerin to clarify the biological characteristics of the orthokeratinized lining epithelium of DMCs, EDMCs, and OOCs. Seven DMCs, 30 EDMCs, 11 OOCs, and 28 KCOTs were examined immunohistochemically using antibodies against CK10, 13, 14, 16, 17, 19, and langerin. Immunoreactivities for CKs and langerin in oral DMCs and EDMCs were similar to those of lesions affecting the skin. Positive reactivity for CK13 and 17 was evident in OOCs, but not in DMCs/EDMCs. CK10 was significantly positive in all layers except for the basal layer in OOCs, but was negative in KCOTs. CK17 was positive in all layers in KCOTs, and in all layers except for the basal layer in both OOCs and dentigerous cysts. CK19 was negative in OOCs. Langerhans cells were found mainly in OOCs, but were hardly evident in KCOTs. These results suggest that DMCs/EDMCs, OOCs and KCOTs are independent diseases.

Overexpression of Activation-Induced Cytidine Deaminase in MTX- and Age-Related Epstein-Barr Virus-Associated B-Cell Lymphoproliferative Disorders of the Head and Neck.

Recent research has shown that activation-induced cytidine deaminase (AID) triggers somatic hypermutation and recombination, in turn contributing to lymphomagenesis. Such aberrant AID expression is seen in B-cell leukemia/lymphomas, including Burkitt lymphoma which is associated with c-myc translocation. Moreover, Epstein-Barr virus (EBV) latent membrane protein-1 (LMP-1) increases genomic instability through early growth transcription response-1 (Egr-1) mediated upregulation of AID in B-cell lymphoma. However, few clinicopathological studies have focused on AID expression in lymphoproliferative disorders (LPDs). Therefore, we conducted an immunohistochemical study to investigate the relationship between AID and LMP-1 expression in LPDs (MTX-/Age-related EBV-associated), including diffuse large B-cell lymphomas (DLBCLs). More intense AID expression was detected in LPDs (89.5%) than in DLBCLs (20.0%), and the expression of LMP-1 and EBER was more intense in LPDs (68.4% and 94.7%) than in DLBCLs (10.0% and 20.0%). Furthermore, stronger Egr-1 expression was found in MTX/Age-EBV-LPDs (83.3%) than in DLBCLs (30.0%). AID expression was significantly constitutively overexpressed in LPDs as compared with DLBCLs. These results suggest that increased AID expression in LPDs may be one of the processes involved in lymphomagenesis, thereby further increasing the survival of genetically destabilized B-cells. AID expression may be a useful indicator for differentiation between LPDs and DLBCLs.