[Airway granular cell tumor].

The paper describes the clinical, morphological, and immunohistochemical characteristics of 13 granular cell tumors of the upper airway. These tumors are shown to have virtually the same histological and immunohistochemical features as granular cell tumors at another site. The histogenesis of these tumors is discussed. There are currently a number of more or less solid grounds for considering them as neurogenic tumors to be close to schwannomas. At the same time one cannot ignore the fact that there is morphological and immunohistochemical evidence for that the granular cell tumors have rather cytotypical than histotypical properties, which cannot implicitly assign them to nerve tissue tumors. Most likely, the granular cell tumors belong to a histogenetically heterogeneous mixed group, in this connection their place in the classification of tumors needs further investigation, by applying the criteria developed by Russian histologists and oncomorphologists.

[Gastrointestinal mixed adenoneuroendocrine carcinomas. An attempt at classification of mixed cancers]. / Gastrointestinale gemischte adenoneuroendokrine Karzinome. Versuch einer Ordnung des Gemischten.

Mixed adenoneuroendocrine carcinomas (MANECs) are a challenge for the diagnostics and the concept of a histogenetic tumor typing. They are classified into three malignant subgroups: high grade malignant MANECs combine an adenoma or adenocarcinoma with a small cell or large cell neuroendocrine carcinoma, intermediate grade malignant MANECs consist of a neuroendocrine tumor (NET grade 1 or 2), often a globlet cell carcinoid and a poorly differentiated adenocarcinoma or diffuse carcinoma of signet ring cell type. The prototype of a low grade malignant MANEC is the globlet cell carcinoid. Molecular analysis indicates a common clonal origin of the different components in MANECs. The prognosis is determined by the most aggressive tumor component. The pathogenesis of MANECs is apparently a sequence of increasing malignant transformation which leads either from an adenoma/adenocarcinoma to a small or large cell neuroendocrine carcinoma or from a neuroendocrine tumor (NET), often a globlet cell carcinoid to a poorly differentiated adenocarcinoma or a diffuse carcinoma of signet ring cell type.

[Benign "mixed" odontogenic tumors]. / Benigne "gemischte" odontogene Tumoren.

Benign "mixed"odontogenic tumors consist of an epithelial and ectomesenchymal tumor component, distinguishing them from pure epithelial and pure ectomesenchymal odontogenic tumors. In addition, they may have the ability to produce dentin, enamel or cementum. Therefore, they can sometimes already be differentiated radiologically from epithelial odontogenic tumors. Some of the mixed odontogenic lesions are regarded as true tumors (ameloblastic fibroma, odontoameloblastoma, dentinogenic ghost cell tumor), while others are assumed to represent hamartomatous lesions (complex and compound odontoma, probably also ameloblastic fibrodentinoma and ameloblastic fibroodontoma). Preceded by keratocystic odontogenic tumor, complex and compound odontomas are the second most common odontogenic tumors, while other members of the "mixed" odontogenic tumor group are far less frequently diagnosed. Odontoameloblastoma and dentinogenic ghost cell tumors are locally aggressive lesions that require total resection. All other lesions of this group are treated by local excision. Since ameloblastic fibrosarcoma may evolve from ameloblastic fibroma, patients with ameloblastic fibroma should remain in long-term follow-up.

[Histological and molecular classification of endometrial carcinoma and therapeutical implications]. / Classification histologique et moléculaire des cancers de l'endomètre et leurs implications dans la thérapeutique.

Endometrial cancer is the fourth cause of cancer in women in France and is the second most common cancer of the gynecologic cancer after breast cancer with 7275 new cases in 2012. The incidence of this neoplasm tends to increase with population aging, diabetes and obesity's augmentation. In rare cases, a hereditary factor has been described: Lynch's syndrome. The therapeutic management of the patient depends on the endometrial biopsy which specifies the histological type and the histo-prognostic grade as well as the MRI which allow the tumor staging. Within the last decade, improvement in technologies such as genomic, transcriptomic and histological analyses, allowed the establishment of new and finer classifications of endometrial carcinomas. The latest classification proposed by The Cancer Genomic Atlas (TCGA), has been made routinely applicable through the international consortium TransPORTEC. It consists of 4 groups listed from good to poor prognosis: (1) ultra-mutated "POLE"; (2) hyper-mutated "MSI"; (3) low copy number "NSMP" and (4) high number of copies "TP53 mutated" (serous-like). This integrated characterization combined with mutational data opens new opportunities for therapeutic strategies.

Emerging tumor entities and variants of CNS neoplasms.

Since the appearance in 2000 of the World Health Organization (WHO) classification for central nervous system (CNS) neoplasms, numerous descriptions of new entities or variants have appeared in the literature. In the group of neuronal and mixed glioneuronal neoplasms are lesions with distinctive morphological features that are still not included in a precise classification, including extraventricular neurocytoma, papillary glioneuronal tumor, rosette-forming glioneuronal of the fourth ventricle, glioneuronal with neuropil-like rosette, and DNT-like tumor of the septum pellucidum. The glioneuronal tumor with neuropil-like rosette and oligodendroglioma with neurocytic differentiation represent morphological variants of genetically proven diffuse gliomas. The lipoastrocytoma and the pilomixoid astrocytoma enlarge the group of astrocytic lesions. Rare, low-grade gliomas of the spinal cord with extensive leptomeningeal dissemination associated with unusual neuroimaging are described. The chordoid glioma of the third ventricle and the papillary tumor of the pineal region seem to be correlated by a common histogenesis from the specialized ependyma of the subcommissural organ. An embryonal tumor with neuropil and true rosettes combining features of neuroblastoma and ependymoblastoma is discussed. These new, recently described lesions indicate that the complex morphologic spectrum of CNS tumors is far from being completely delineated.

Mixed endocrine-exocrine tumors of the gastrointestinal tract.

Mixed endocrine-exocrine tumors of the gastrointestinal tract are rare neoplasms, which have been reported in the literature mainly as case reports and have been designated with a various and rather confusing terminology. In this review, on the basis of personally studied cases and of the analysis of cases reported in the literature, we have tried to identify types of mixed endocrine-exocrine tumors showing different clinicopathologic and biological characteristics. We have also tried to group the different clinicopathologic entities in prognostic classes which include: benign, low-grade, intermediate grade, and high-grade malignant mixed endocrine-exocrine tumors. The criteria for identifying the various types of mixed endocrine-exocrine tumors are extensively discussed.

Positron emission tomography in relation to Noguchi's classification for diagnosis of peripheral non-small-cell lung cancer 2 cm or less in size.

BACKGROUND: F-18 fluorodeoxyglucose positron emission tomography ((18)F-FDG-PET) scanning has become a critically important tool in diagnosis and management of non-small-cell lung cancer. However, the effectiveness of (18)F-FDG-PET as a diagnostic tool for small-sized lung cancer is controversial. The purpose of this study was to examine the accuracy of( 18)F-FDG-PET in relation to Noguchi's classification in the diagnosis of small peripheral non-small-cell lung cancer. METHODS: Between January 2003 and April 2006, 150 patients with peripheral lung lesions who were undergoing chest computed tomography (CT),( 18)F-FDG-PET, and operation were analyzed. RESULTS: Eighty-three patients had malignant lesions, and 67 patients had benign lesions. PET had a sensitivity, specificity, positive predictive value, and negative predictive value of 75.9%, 64.1%, 72.4%, and 68.3%, respectively. In 37 patients with peripheral lung cancer measuring 2.0 cm or less in the greatest diameter, the sensitivity was 51.4% and the specificity was 51.9%. Among them, all 4 cases of Noguchi type A adenocarcinoma [localized bronchioloalveolar carcinoma (LBAC)], 4 of 5 type B and 8 of 17 type C were false negative, while 9 of 11 (81.8%) types D, E, and F (invasive carcinomas without a BAC component) were true positive. CONCLUSION: The accuracy of( 18)F-FDG-PET is generally low in distinguishing malignancy from benign lesions in small lesions (<2.0-cm diameter). The significance of PET as a diagnostic tool is small, especially when the tumor has a ground-glass component at a high rate. The sensitivity of PET is high in small invasive carcinomas without a BAC component, but it is difficult to distinguish carcinoma from benign tumor from its image.

Prognostic factors in malignant mixed tumors of the salivary gland: correlation of immunohistochemical markers with histologic classification.

Malignant mixed tumor of salivary glands is a rare tumor whose variable behavior and prognosis are related for the most part to the clinical stage and histologic grade of the carcinomatous component. The purpose of this study is to predict prognosis by comparing the histologic grading and subclassification of the carcinomatous component with the immunohistochemical reactivity for E-cadherin, P53 mutation protein, and cellular proliferation (Ki67). Stains were performed on formalin-fixed paraffin-embedded tissue sections from 18 cases of malignant mixed tumor. Clinical follow-up was obtained for each patient. Regional lymph node and distant organ metastases were the criteria for poor prognosis. Of seven cases with lymph nodes metastasis, five were high-grade tumors (with one subsequent death from brain metastasis) and two were low-grade. Of the eight high-grade tumors, positivity for Ki67, p53, and E-cadherin were noted in six, four, and two cases, respectively. In contrast, of the 10 low-grade tumors, two stained with Ki67, five with p53, and none with E-cadherin. Most notably, all seven metastatic cases (as opposed to only one of 11 nonmetastatic tumors) had Ki67 reactivity of more than 10%. We conclude that malignant mixed tumor represents a spectrum of malignancies in which the clinical behavior is closely related to the carcinomatous element. In addition to histologic grading, Ki67 is a useful prognostic marker in the evaluation of malignant mixed tumor while p53 and E-cadherin appear to be of limited value.