Melanotic Neuroectodermal Tumor of Infancy of the Upper Arm.

OBJECTIVE: To present a case of a 6-month-old infant with melanotic neuroectodermal tumor of infancy (MNTI) in the upper arm. CLINICAL PRESENTATION AND INTERVENTION: A 6-month-old female presented with a well-circumscribed lesion of the upper arm at the Children's Hospital Zagreb. A biopsy was performed and microscopy revealed 2 cell populations consisting of small neuroblastic cells and larger melanin-containing epithelial cells. An excisional biopsy performed 1 month later confirmed the initial diagnosis of MNTI, but the tumor had increased in size since the initial biopsy. After complete surgical excision the patient recovered well with no recurrence. CONCLUSION: The MNTI located in the upper arm was diagnosed on first biopsy and surgically excised completely. The patient recovered without recurrence in a follow-up of 2.5 years.

Proteomics profiling of keratocystic odontogenic tumours reveals AIDA as novel biomarker candidate.

BACKGROUND: Keratocystic odontogenic tumour (KCOT) is a benign, yet aggressive odontogenic tumour. Herein, proteome analysis of KCOT lesions in comparison with control patient-matched tissue unaffected by the disease and with inflammatory odontogenic cysts, namely radicular cysts is presented. METHODS: For the proteomics profiling, two complementary proteomics techniques MALDI-MS/MS and LC-ESI-MS/MS were employed. Potential candidate biomarkers were validated by immunohistochemistry. RESULTS: More than 43 proteins were found to be differentially expressed or up-regulated in KCOT lesions in comparison with patient-matched unaffected oral mucosa. These proteins bear important biological functions and are involved in cell proliferation, cytoskeletal re-organization, transcription, cellular motility and apoptosis. In particular, a number of differentially expressed proteins participate in autocrine regulation and signalization within JNK and p38 MAPK signalling pathways. CONCLUSIONS: Immunohistochemical validation of chosen putative biomarkers revealed axin interaction partner and dorsalization-antagonist (AIDA), known as a protein that blocks activation of JNK signalling pathway, as a differential biomarker for KCOT lesions on an independent cohort of KCOT tissue samples in comparison with most prevalent intra-oseal lesions inflammatory odontogenic cysts.

Cutaneous Hyalohyphomycosis and Its Atypical Clinical Presentations in Immunosuppressed Patients.

There has been a substantial increase in the number of cases of invasive fungal infections worldwide, which is associated with a growing number of immunosuppressed patients and a rise in antifungal resistance. Some fungi that were previously considered harmless to humans have become emerging pathogens. One of them is Purpureocillium lilacinum, a ubiquitous filamentous fungus commonly found in the environment, especially in the air and soil. P. lilacinum belongs to a bigger group of hyaline fungi that cause hyalohyphomycosis, a fungal infection caused by fungi with colorless hyphae. Although this is a heterogeneous group of fungi, there are similarities regarding their ubiquity, ways of transmission, affected patients, and difficulties in diagnostics and treatment. In hyalohyphomycosis, the skin is one of the most affected organs, which is why the involvement of dermatologists is crucial for the initial assessment, since the timely recognition and early diagnosis of this condition can prevent life-threatening infections and death. In this review, we covered cutaneous hyalohyphomycosis caused by P. lilacinum and other fungi in the same group, including Fusarium, Penicilium, Scedosporium, Scopulariopsis, Acremonium, and Trichoderma genera.

Association of BRAF V600E Mutant Allele Proportion with the Dissemination Stage of Papillary Thyroid Cancer.

The early identification of aggressive forms of cancer is of high importance in treating papillary thyroid cancer (PTC). Disease dissemination is a major factor influencing patient survival. Mutation status of BRAF oncogene, BRAF V600E, is proposed to be an indicator of disease recurrence; however, its influence on PTC dissemination has not been deciphered. This study aimed to explore the association of the frequency of BRAF V600E alleles in PTC with disease dissemination. In this study, 173 PTC samples were analyzed, measuring the proportion of BRAF V600E alleles by qPCR, which was then normalized against the proportion of tumor cells. Semiquantitative analysis of BRAF V600E mutant protein was performed by immunohistochemistry. The BRAF V600E mutation was present in 60% of samples, while the normalized frequency of mutated BRAF alleles ranged from 1.55% to 92.06%. There was no significant association between the presence and/or proportion of the BRAF V600E mutation with the degree of PTC dissemination. However, the presence of the BRAF mutation was significantly linked with angioinvasion. This study's results suggest that there is a heterogeneous distribution of the BRAF mutation and the presence of oligoclonal forms of PTC. It is likely that the BRAF mutation alone does not significantly contribute to PTC aggressiveness.

(Reactive) Eccrine Syringofibroadenoma with Foci of Squamous Cell Carcinoma in situ: A Case Report.

We describe a rare case of an eccrine syringofibroadenoma with a foci of squamous cell carcinoma in situ, which has to best of our knowledge been reported only twice in the English literature. An excisional biopsy of an elevated, lobular tumor of the lower leg in an 86-year-old male patient was performed. Histologic examination revealed a tumor consisting of anastomosing strands of epithelial cells originating from the epidermis, occasionally showing ductal eccrine differentiation. Foci of squamous cell carcinoma in situ were observed within the described lesion. The diagnosis of eccrine syringofibroadenoma with squamous cell carcinoma in situ was established. Eccrine syringofibroadenoma is a rare lesion, mostly considered to be a reactive process arising secondarily in association with other cutaneous diseases such as dermatoses or neoplasms, although some researchers do not exclude the possibility that it is a primary neoplasm with a potential for malignant transformation.

Human C2a and C6a iPSC lines and H9 ESC line have less efficient cardiomyogenesis than H1 ESC line: Beating enhances cardiac differentiation.

BACKGROUND: Human induced pluripotent stem cells (hiPSCs) need to be thoroughly characterized to exploit their potential advantages in various aspects of biomedicine. The aim of this study was to compare the efficiency of cardiomyogenesis of two hiPSCs and two human embryonic stem cell (hESC) lines by genetic living cardiomyocyte labeling. We also analyzed the influence of spontaneous beating on cardiac differentiation. METHODS: H1 and H9 hESC lines and C2a and C6a hiPSC lines were induced into in vitro directed cardiac differentiation. Cardiomyogenesis was evaluated by the analysis of cell cluster beating, cardiac protein expression by immunocytochemistry, ability of cells to generate calcium transients, and cardiomyocyte quantification by the myosin light chain 2v-enhanced green fluorescent protein gene construct delivered with a lentiviral vector. RESULTS: Differentiation of all cell lines yielded spontaneously beating cell clusters, indicating the presence of functional cardiomyocytes. After the cell dissociation, H1-hESC-derived cardiomyocytes exhibited spontaneous calcium transients, corresponding to autonomous electrical activity and displayed ability to transmit them between the cells. Differentiated hESC and hiPSC cells exhibited striated sarcomeres and expressed cardiac proteins sarcomeric α-actinin and cardiac troponin T. Cardiomyocytes were the most abundant in differentiated H1 hESC line (20% more than in other tested lines). In all stem cell lines, cardiomyocyte enrichment was greater in beating than in non-beating cell clusters, irrespective of cardiomyogenesis efficiency. CONCLUSION: Although C2a and C6a hiPSC and H9 hESC lines exhibited efficient cardiomyogenesis, H1 hESC line yielded the greatest cardiomyocyte enrichment of all tested lines. Beating of cell clusters promotes cardiomyogenesis in tested hESCs and hiPSCs.

[Urothelial carcinoma with an inverted growth pattern: a report of 4 cases]. / Urotelni karcinom invertiranog nacina rasta--prikaz 4 bolesnika.

AIM: Urothelial (transitional cell) tumors account for about 90% of all bladder tumors. Their presentation varies from benign lesions that rarely recur to highly malignant tumors. Inverted (endophytic) growth pattern in urothelial carcinoma is particulary hard to distinguish from inverted papilloma. Morphologic criteria alone are not enough and immunohistochemical assesments must also be done, especially in cases of small size biopsy material or transurethral resections. The aim of this study was to accentuate the importance and ways of differentiation of this variable forms as their treatment and prognosis differ. PATIENTS AND METHODS: In the period from 01.01.2008. to 30.06.2009. at Department of Pathology, University Hospital "Sestre milosrdnice" four patients were diagnosed with low-grade urothelial carcinoma with an inverted growth pattern. Routine histology and additional immunohistochemistry to p53, Ki-67 and CK 7 and 20 was performed. RESULTS: There were three male patients aging 37, 61 and 69 years and one female aged 46 (mean 53.3 years). Three patients presented with painless hematuria while the last patient had microhaematuria as an Incidental finding. Histologically, tumors formed nests of atypical urothelial cells. Very few or no mitotic figures were observed. Invasion of lamina propria was present in three specimens. Immunohistochemically, positive staining to p53 and CK 20 was observed in all four cases and staining to CK 7 in two. Staining to CK 20 was positive in 80%-100% of tumor cells while the number of p53 positive cells was between 20% and 40% in all four cases. Proliferative activity was assesed using Ki-67 antibody. The percentage of positively stained tumor cells, assesed in hot spots under high magnification (400x), was 5%, 7%, 8% and 12% (mean 8%). CONCLUSION: Urothelial carcinoma with inverted growth pattern and inverted papilloma have similar morphologic features but their biological behaviour, treatment and prognosis are different. In order to avoid the urothelial carcinoma to be misdiagnosed as a benign papilloma, we find it very important to make additional investigations beside conventional histology. Immunohistochemical staining for CK 20, p53 and Ki-67, which is positive in most carcinomas, can help us make the right diagnosis.

Peritumoral Clefting and Expression of MMP-2 and MMP-9 in Basal Cell Carcinoma of the Skin.

BACKGROUND/AIM: Peritumoral clefting is one of the main histologic features of basal cell carcinoma of the skin (BCC). The aim of the study was to analyze the expression of MMP-2 and MMP-9 both in cells of basal cell carcinoma and in the adjacent stroma and to correlate the findings of immunohistochemical analysis with the presence of peritumoral clefting. PATIENTS AND METHODS: The study was made on archival material comprising 48 cases of BCC. These were scanned for the presence of peritumoral clefts. The results of immunohistochemical staining for MMP-2 and MMP-9 were determined semiquantitatively using immunohistochemical staining index (ISI). RESULTS: Peritumoral retractions were found in 40 BCC cases. Positive immunohistochemical reaction for MMP-2 in tumor cells was found in 47 cases and in all cases in the adjacent stroma. Positive immunostaining for MMP-9 in BCC tumor cells was observed in 37 cases and in all cases in the adjacent stroma. There was no statistically significant association between peritumoral retractions and expression of MMPs. A statistically significant correlation was found in the expression of both MMP-2 and MMP-9 between the tumor and the stroma. CONCLUSION: Tumor cells elaborate MMP-2 and -9, but they also produce some other factors that may induce production of MMPs in adjacent stromal cells. The role of MMPs in the development of peritumoral clefts could not be confirmed.

High Grade T1 Papillary Urothelial Bladder Cancer Shows Prominent Peritumoral Retraction Clefting.

Differentiation of noninvasive from invasive papillary urothelial carcinoma can be challenging due to inability of proper orientation and thermal damage of transurethrally obtained material. The aim of this study was to analyze the presence and extent of peritumoral retractions in pT1 compared to pTa papillary urothelial carcinoma. Since peritumoral retractions may result from altered expression profiles of extracellular matrix proteins, we additionally analyzed the expression of matrix metalloproteinase 2 (MMP-2) and interleukin 8 (IL-8) in these tumors. The study comprised 50 noninvasive (pTa) and 50 invasive (pT1) cases of transurethrally obtained primary papillary urothelial carcinomas. The invasive nature of nests showing peritumoral retractions was confirmed immunohistochemically using antibody against collagen IV. Staining for MMP-2 and IL-8 was evaluated semiquantitatively using immunohistochemical staining index, calculated by multiplying the percentage of positive cells and staining intensity. Peritumoral retractions were found in 32% of pT1 carcinomas but in none of the pTa carcinomas. All tumors showing peritumoral retraction were high grade tumors. There was no statistically significant correlation between the expression of MMP-2 or IL-8 and the presence of peritumoral retractions or stage of the tumor (pTa vs. pT1). A statistically significant but weak correlation was found between MMP-2 and IL-8 expression (χ2-test, p=0,015). There was no statistically significant correlation between the presence of peritumoral retractions or MMP-2 expression and tumor recurrence and progression. Our study shows that, in doubtful cases, when differentiating between pTa and pT1 stages of papillary urothelial carcinoma, the presence of peritumoral retractions could favor the diagnosis of invasive neoplasm.

Inflammation in Prostatic Hyperplasia and Carcinoma-Basic Scientific Approach.

Chronic inflammation is associated with both benign conditions and cancer. Likewise, inflammatory cells are quite common in benign prostatic hyperplasia (BPH) and prostatic tissue harboring cancer. Triggers that activate inflammatory pathways in the prostate remain a subject of argument and are likely to be multifactorial, some of these being bacterial antigens, different chemical irritations, and metabolic disorders. Acute and chronic inflammation in prostate leads to accumulation of immunocompetent cells, mainly T lymphocytes and macrophages, but also neutrophils, eosinophils, and mast cells, depending on the type of offending agent. Inflammatory processes activate hyperproliferative programs resulting in nodules seen in BPH, but are also important in creating suitable microenvironment for cancer growth and progression. Inflammatory cells have mostly been shown to have a protumoral effect such as tumor-associated macrophages, but some cell types such as mast cells have antitumoral effects. This review outlines the recent findings and theories supporting the role of inflammatory responses as drivers of both benign and malignant epithelial processes in the prostate gland.

Malignant Peripheral Nerve Sheath Tumor of the Inguinum and Angiosarcoma of the Scalp in a Child with Neurofibromatosis Type 1.

Benign and malignant tumors are common in the setting of neurofibromatosis type 1 (NF1). Malignant peripheral nerve sheath tumor (MPNST) and angiosarcoma are rare tumors in children and adolescents and mostly occur in young patients in relation to NF1. Both histological types can be present in the same tumor mass in patients with NF1. We present a case of 12.5-year-old girl with NF1 who first presented with MPNST of the right inguinal region and 1.5 years later with unrelated angiosarcoma of the scalp.

Immunohistochemical expression of STAM2 in gastrointestinal stromal tumors.

BACKGROUND: Gastrointestinal stromal tumors (GISTs) are the most common mesenchymal tumors of the digestive tract, believed to originate from the interstitial cells of Cajal or their stem cell-like precursors. Recent studies incidentally found the expression in interstitial cells of Cajal of the signal-transducing adaptor molecule-2 (STAM2), which is an endosomal protein acting as a regulator of receptor signaling and trafficking. Here, we investigated the immunohistochemical expression of STAM2 in GIST. MATERIALS AND METHODS: To evaluate the level of STAM2 expression, the percentage of cells staining positively for STAM2 and their staining intensity were graded on a scale of 0-3 and then multiplied to give the staining index as: 0=none; 1-3=low; 4-6=moderate and 9=high. RESULTS: In 51 analyzed GIST samples, expression of STAM2 was observed in 45 cases (88.2%). Based on antibody screening, we observed a positive correlation between the expression of GIST marker stem cell growth factor receptor, also known as tyrosine-protein kinase KIT or CD117, and STAM2 expression (r=0.387, p<0.003). To identify possible STAM2 function in GIST, we performed correlation analysis between STAM2 expression and tumor size, primary tumor site, tumor type, mitotic count, Ki-67 proliferative index, risk stratification and development of recurrent/metastatic disease. Among these parameters, only correlation between the percentage of STAM2-positive cells and mitotic count was statistically significant (r=-0.362, p<0.01). CONCLUSION: Further studies are required to unravel the role of STAM2 in the oncogenic cell phenotype of GIST.

Expression of growth hormone and growth hormone receptor in fibroadenomas of the breast.

Fibroadenoma is the most prevalent benign breast tumor. It consists of epithelial and stromal components. In general, breast tumors are highly hormonally dependent and growth hormone by its physiology may have a possible oncogenic potential. Therefore, the aim of this study was to determine the expression of growth hormone and growth hormone receptor in epithelial and stromal components of fibroadenomas. Study group included 30 randomly chosen fibroadenomas from female patients aged between 18 and 69 years. The expression of growth hormone and growth hormone receptor was defined in both histologic components of fibroadenomas. Growth hormone was expressed in 96.7% of both epithelial and stromal components of fibroadenomas, with stronger expression in the stromal component. The same percentage of positive reaction (96.7%) was obtained in the epithelial component of fibroadenomas for growth hormone receptor expression. Only 6.7% of stromal components tested for growth hormone receptor were positive. The high expression of growth hormone and growth hormone receptor in fibroadenoma tissue indicates their possible role in the pathogenesis of this tumor. Follow up of patients with high expression of growth hormone and growth hormone receptor may be suggested.

Angiomyolipomatous hamartoma of the inguinal lymph node--report of two cases and literature review.

Angiomyolipomatous hamartoma is a variant of angiomyomatous hamartoma (AMH), a rare nodal smooth muscle proliferation, first identified as a distinct entity by Chan et al. in 1992. To date, several cases have been described, mostly involving inguinal lymph nodes. We present two cases of angiomyolipomatous hamartoma, in a 52-year-old male and 67-year-old female patient. Both patients were surgically treated. Microscopically, in the affected nodes, the parenchyma was mostly replaced with bundles of smooth muscle cells, fibrous tissue and lobules of mature adipocytes. Only a few atrophic lymphatic follicles were maintained in the subcapsular area. The presence of smooth muscle cells and endothelial cells was confirmed immunohistochemically by staining for smooth muscle actin, desmin and CD31. The hilus contained numerous thick-walled vessels extending to the medulla. Pleomorphism, mitoses and necrosis were absent. Considering there are no reported recurrences of AMH, it probably has benign behaviour; thus extensive resection may not be needed. Nevertheless, we believe that recognition of AMH is important in the differential diagnosis of other pathological conditions that may affect lymph nodes.

Periacinar retraction clefting and d2-40 expression in prostatic adenocarcinoma.

Retraction clefting is known to appear in various types of tumors, but it has only recently been recognized as a specific histological phenomenon. Previously, it was considered merely a laboratory procedure artifact, but lately, there have been some assumptions that peritumoral retractions actually represent lymphatic spaces. In our study, we analyzed neoplastic glands in 52 specimens of prostatic adenocarcinoma. Immunohistochemical analysis was performed using D2-40 antibody, to highlight lymphatic endothelium and thereby differentiate actual lymph vessels or lymphovascular invasion from periacinar retractions. Our results showed that the number of lymph vessels was significantly lower in tumorous tissue compared to adjacent normal prostatic tissue. On the other hand, the number of lymph vessels in tumorous tissue was significantly higher than the number of lymph vessels mimicking periacinar retractions. Overall, the number of lymph vessels mimicking periacinar clefts was particularly low. These results are in accordance with our previous studies, which had shown that periacinar clefting appears due to lack of basal cells and stromal changes around tumorous acini. Also, these results support our hypothesis that retractions do not represent lymph vessels but should be considered a distinct entity, which is proven to be helpful both as diagnostic and predictive factor.

Higher apoptotic cell rate in Balkan endemic nephropathy--stereologic analysis.

The aim of this study was to correlate apoptotic cell rate from different nephron segments between control group and groups of patients with Balkan endemic nephropathy (BEN). Kidney specimens of20 patients with clinically and epidemiologically confirmed BEN were compared with biopsy material of 10 patients (group I, non BEN) without glomerular or tubulointerstitial disease. Out of 20 patients with BEN, 10 suffered and died from BEN (group II, BEN) and 10 patients (group III, BEN/CV) suffered from BEN but died from cardiovascular disease. Patient age ranged from 40 to 50 years. The apoptotic cell rate was measured in proximal and distal tubules and in collecting ducts using the 40X objective with a calibrated eyepiece multipurpose M 42 test system according to Weibel. Comparison of all three nephron segments yielded statistically significant differences in volume density of apoptotic cells in proximal tubules and in collecting ducts among all three patient groups (non BEN vs. BEN, non BEN vs. BEN/CV and BEN vs. BEN/CV, P<0.001 all). Statistically significant difference in apoptotic cell rate was also found in distal tubules between non BEN and BEN groups and non BEN and BEN/CV groups, but not between BEN and BEN/CV groups. Our results showed a statistically significant increase of apoptotic cells in all three nephron segments in patients with BEN (BEN and BEN/CV) compared to control group. The highest number of apoptotic cells was found in distal tubules in the groups of patients with BEN and BEN with coexisting cardiovascular disease, suggesting that these cells might be most frequently and most severely injured in patients with BEN.

Primary osteosarcoma of bladder diverticulum mimicking intradiverticular calculus: a case report.

There is a well-documented relationship between urinary bladder diverticula and intradiverticular neoplasms. The great majorities of these tumors are urothelial carcinomas, but may also be of glandular or squamous type. Sarcomas occurring within bladder diverticula are exceptionally rare and highly malignant lesions, with only 20 well documented cases published in the literature to date (including carcinosarcomas). We report a case of osteosarcoma of the bladder diverticulum in a 68-year old man, which clinically mimicked intradiverticular calculus. To our knowledge, this is the second case described in the literature to date, and the first in English literature.

Immunohistochemical expression of tumor antigens MAGE-A3/4 and NY-ESO-1 in renal oncocytoma and chromophobe renal cell carcinoma.

The distinction between renal oncocytoma (RO) and chromophobe renal cell carcinoma (ChRCC), especially the eosinophilic variant, can often be difficult. Our study has documented for the first time the expression of MAGE-A3/4 and NY-ESO-1 cancer testis antigens (CTAs) in these tumors. A total of 35 patients (17 ROs and 18 ChRCCs) were included in the study. Two antibodies were used for immunohistochemical staining: 57B recognizing multiple MAGE-A and D8.38 recognizing NY-ESO-1 CTAs. Fifteen (88.2%) samples of RO stained positively for both MAGE-A3/4 and NY-ESO-1 antigens. Regarding ChRCC, seven (38.9%) stained positively for MAGE-A3/4 and six (33.3%) for NY-ESO-1 antigens. Median MAGE-A3/4 expression was moderately positive in RO and negative in ChRCC. The difference in MAGE-A3/4 expression between two tumor groups was significant (P=0.0013). Median NY-ESO-1 expression was strongly positive in RO and negative in ChRCC. The difference in NY-ESO-1 expression between two tumor groups was also significant (P=0.0008). Our study has shown that RO had a significantly higher expression of both CTAs. However, additional research is needed to clarify their potential diagnostic implications.