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Biomedical subjects

U Schmid

Publications and source records attributed to U Schmid.

At least 55 records · Page 3Linked to original sources

[Recurrent eyelid tumor in necrotizing panniculitis].

To our knowledge, necrotizing lid tumors occurring in the context of a necrotizing lobular panniculitis have not yet been described in the literature. Our patient, a 75-year-old male, presented with indolent, nonmoveable subcutaneous lumps that were centrally ulcerating. They appeared first on his upper lid, then on his lower lid and thereafter on the neck, back, upper extremity and abdomen, especially in the area of his cholecystectomy scar. A thorough work-up, which included repeated histopathological examinations performed by several laboratories, led to the diagnosis of an idiopathic necrotizing lobular panniculitis. A serum level determination performed later revealed no alpha 1-antitrypsin deficiency. As the eye-lid's subcutaneous tissue lacks fat, the association between the necrotizing lid tumors and the necrotizing panniculitis appears to be a paradox. In spite of the normal alpha 1-antitrypsin serum levels--determined when the patient's lesions had long ago healed--we think in retrospect that the differential diagnosis should have included the possibility of a decreased alpha 1-antitrypsin serum level (e.g. heterozygous MZ-phenotype). An alpha 1-antitrypsin level deficiency--with resulting decreased inhibition of collagenase and elastase--could account for the necrotizing process that also occurred in the eyelid's subcutaneous tissue. In the Van Gieson stain of this patient's eyelid biopsy, fragmentation of all visible collagen and elastic fibers was noted. In our opinion, the differential diagnosis does include lid involvement with secondary panniculitis caused by partially decreased alpha 1-antitrypsin serum levels and--by exclusion--idiopathic necrotizing lobular panniculitis. Therapeutic possibilities are briefly discussed.

Aged↗

Distribution of cytokeratin polypeptides in syringomas. An immunohistochemical study on paraffin-embedded material.

The distribution of cytokeratin (CK) polypeptides expressed in syringomas (12 cases) was compared with that in normal eccrine sweat ducts using immunohistochemical techniques on paraffin-embedded tissue. Intradermal and intraepidermal segments of the eccrine duct showed reactivity with an antibody to CK1/5/10/11 in all cell layers, whereas CK19 expression was restricted to the luminal cell layer. CK14 was expressed in all cells of the eccrine duct except for the peripheral cells of the intraepidermal duct. Expression of CK5/6 was seen in the basal cells of the dermal duct and of the lower intraepidermal duct (sweat duct ridge) exclusively. Reactivity with an antibody to CK1 was found in the intermediate cells of the uppermost part of the eccrine dermal duct. In addition, this antibody gave a strong staining of the peripheral cells of the intraepidermal duct, leaving basal cells of the sweat duct ridge and luminal cells unstained. In syringoma, CK distribution was essentially comparable with that found in the uppermost part of the dermal duct and in the sweat duct ridge. Namely, ductal luminal cells expressed CK1/5/10/11, CK19, and variably CK14. Intermediate cells of ductal structures and solid nests were homogeneously stained by antibodies to CK1 and CK1/5/10/11, whereas CK14 was expressed heterogeneously. The basal or outermost layer of ductal structures and solid nests was reactive with antibodies to CK1/5/10/11, CK5/6, and CK14. With regard to CK expression, the results indicate that syringoma represents a tumor differentiating toward both the uppermost part of the dermal duct and the lower intraepidermal duct (sweat duct ridge) of the eccrine sweat gland.

Adenoma↗

Cytokeratin expression in mucinous sweat gland carcinomas: an immunohistochemical analysis of four cases.

Four mucinous sweat gland carcinomas were examined for the distribution of cytokeratin (CK) polypeptides using immunohistochemical techniques on paraffin-embedded sections. All the tumour specimens reacted with monoclonal antibodies to CK 7, CK 8, CK 18 and CK 19. Antibodies to CK 1, CK 1/2/10/14, CK 1/5/10/11, CK 13, CK 14 and CK 20 did not stain any of the carcinomas. The results add additional support to the notion that mucinous sweat gland carcinoma represents a tumour histogenetically related to the eccrine secretory coil. Furthermore, the absence of CK 20 might significantly contribute to the differentiation of this tumour from cutaneous metastases from gastrointestinal carcinomas.

Adenocarcinoma, Mucinous↗

Myoepithelial differentiation in benign sweat gland tumors. Demonstrated by a monoclonal antibody to alpha-smooth muscle actin.

One hundred and two cases of benign sweat gland tumors of the skin were studied for the presence of myoepithelial cells specifically identified by a monoclonal antibody to alpha-smooth muscle actin on paraffin-embedded tissues. The monoclonal antibody gave a positive result in 12 of 12 cases of cylindroma, 14 of 16 cases of spiradenoma, 2 of 2 cases of apocrine tubular adenoma (papillary eccrine adenoma), 5 of 5 cases of apocrine hidrocystoma, 5 of 5 cases of hidradenoma papilliferum, and in 10 of 10 cases of syringocystadenoma papilliferum. Rare myoepithelial cells were detected in only 1 of 10 cases of mixed tumor, apocrine type. There was no immunoreactivity for alpha-smooth muscle actin in eccrine hidrocystoma (2 cases), mixed tumor of eccrine type (2 cases), syringoma (7 cases), hidroacanthoma simplex (1 case), eccrine poroma (14 cases), clear cell hidradenoma (15 cases), and in 1 case of eccrine syringofibroadenoma. Our data support the concept that myoepithelial cells are seen in most sweat gland tumors considered to differentiate toward the secretory coil of the normal sweat gland. In contrast, myoepithelial cells are absent in tumors showing differentiation toward the excretory (ductal) component of the gland.

Actins↗

[New perspectives of in vitro kallikrein treatment. II. Study of the hamster ovum penetration test in relation to the kallikrein-kinin system].

A significant enhancement of the fertilizing capacity of human spermatozoa by Kallikrein has recently been described in a former study. To assess the therapeutic possibilities it would be of great interest to know more about the biochemical effect of Kallikrein on the fertilizing capacity of human spermatozoa. This fact made the authors investigate 64 semen samples in which the binding score and the fertilizing capacity were determined after application of Kallikrein in a HOP-test (hamsterovum-penetration-test) and compared to the control. Furthermore these results were compared to the varying concentrations of the components of the Kallikrein-Kinin-system. An application of Kallikrein in the swim-up preparation resulted in a higher motility in patients with asthenozoospermia, whereas the patients belonging to the group of oligoasthenozoospermia showed a lower progressive motility compared to the control. The binding score (number of affixed spermatozoa) showed nearly the results in both preparations. On the other hand the fertilizing capacity in the Kallikrein preparation was significantly higher. A possible connection with the concentrations of the components of seminal plasma has not been found, yet, but regarding all results a direct enzymatic effect of Kallikrein on fertilizing potential can be assumed.

Animals↗

[Peripheral spontaneous remission of hairy cell leukemia following transfusion-associated hepatitis C].

In a 59-year-old patient presenting in October 1981 with pancytopenia, hairy cell leukemia was diagnosed. Splenectomy, followed by treatments with oncovin, lithium, and prednisone were essentially without effect. Up to July 1984 the patient had been regularly transfused with a total of 62 unit. In June 1984 he acquired a transfusion associated hepatitis C which followed a chronic course and resulted in biopsy proven cirrhosis in 1989. The patient became independent of transfusions in July 1984. Repeated blood counts have shown a complete hematologic remission which has now lasted nearly 6 years, whereas focal leukemic infiltrates have persisted in the bone marrow. The patient has tolerated 20 courses of erythropheresis performed because of biopsy proven severe hepatic siderosis without a fall in hemoglobin. It is suggested that the spontaneous long-lasting hematologic remission of hairy cell leukemia is due to endogenous interferon produced in the course of chronic hepatitis C. Low serum levels of interferon-alpha and -gamma were detected.

Combined Modality Therapy↗

Primary B-cell gastric lymphoma: a clinicopathological study of 145 patients.

Resection specimens from 145 patients with primary B-cell gastric lymphoma at stage IE (n = 88) and at stage IIE (n = 57) were investigated. Histologically, low-grade malignant B-cell lymphomas arising from the mucosa-associated lymphoid tissue, including immunocytoma (n = 71), could be distinguished from high-grade malignant B-cell lymphomas with (n = 25) and without (n = 49) evidence of a low-grade component. The very rare low-grade B-cell lymphomas of centroblastic-centrocytic, centrocytic, and plasmacytic type were not considered. All patients had undergone primary gastric resection, and 65 received additional chemotherapy (n = 33), radiotherapy (n = 22), or both (n = 10). Actuarial overall survival rates calculated by the Kaplan-Meier life-table method were 76% after 5 years and 58% after 10 years. According to the Mantel test and a multivariate analysis using the Cox regression method, patients at stage IE had a significantly better survival probability than those at stage IIE (P less than 0.0001); 5-year survival rates were 87% and 61%, respectively. The survival probability for low-grade malignant lymphomas was significantly better than for tumors with secondary high-grade transformation (P less than 0.05) or for primary high-grade lymphomas (P less than 0.0001), whereas the two high-grade groups were not significantly different. Five-year survival rates were 91% for low-grade, 73% for secondary high-grade, and 56% for primary high-grade malignant lymphomas. Retrospectively, no significantly different survival rates were found between patients who had undergone gastric resection alone and patients who had received additional treatment. However, survival analyses showed that classification and grading according to the histopathological concept of mucosa-associated lymphoid tissue-derived gastric lymphomas into low-grade B-cell lymphomas of mucosa-associated lymphoid tissue type and high-grade B-cell lymphomas with or without evidence of a low-grade component has great prognostic relevance.

Actuarial Analysis↗

[Eccrine poroma. A clinico-pathologic and immunohistologic study with special reference to tumor cell differentiation].

In this study 15 eccrine poromas were analysed clinically, histologically and immunohistologically. They were all solitary lesions, showing a predilection for the head and neck. In none of the tumours was diagnosis possible on the basis of clinical examination. Histomorphologically, eccrine poromas were characterized by aggregations of neoplastic cells continuous with the epidermis. The neoplasms consisted of two cell types, poroid and cuticular. Poroid cells predominated, while cuticular cells were only found in small foci, sometimes showing tubular differentiation. Immunohistologically, most of the tumour cells showed a cytokeratin pattern (CK1, 5, 10, 11+, CK1-19+) favouring differentiation toward the abluminal cell of the dermal eccrine duct rather than toward the abluminal cell of the intraepidermal segment of the eccrine duct. Only a small proportion of cells revealed the immunohistological features of the abluminal cell of the intraepidermal duct (CK1+, CK1, 5, 10, 11+, CK1-19+). In addition, cuticular cells showed differentiation toward the luminal cell of the eccrine duct (CK19+, CK1, 5, 10, 11+, CK1-19+). Simple-type cytokeratins such as CK7 and CK18 were not expressed. In conclusion, our findings favour the hypothesis that ascribes the origin of eccrine poroma to a pluripotential stem cell of the transitional zone between the dermal and the intraepidermal segments of the eccrine duct.

Adenoma, Sweat Gland↗

[New perspectives of in vitro kallikrein treatment of human spermatozoa. I. Study of the hamster ovum penetration test in relation to different andrologic patient groups].

Whereas the enhancement of motility by Kallikrein is described several times, the effect on fertilizing capacity of human spermatozoa has not been investigated sufficiently yet. This fact induced the authors to start a further investigation on 64 patients by the means of zona-free hamster oocytes. The patients were differentiated by the parameters density and motility. The sample was divided up into two aliquots. Differing from the control the other aliquot was prepared with Kallikrein (5 KU/ml) before swim-up and preincubation for one hour at 22 degrees C. Comparing the results we found looking at the whole collective (n = 64) a significant enhancement of the fertilizing capacity. 34 of 64 patients showed an improvement, only 4 patients deteriorated. While the groups normo-, oligo-, and asthenozoospermia reached a higher fertilizing capacity under Kallikrein-treatment (probability of error 2.5%), a Kallikrein application in case of oligo-asthenozoospermia had no significant influence on fertilizing capacity. A view of the whole results leads to the assumption of a direct effect of Kallikrein and to the possibility of use for GIFT and IVF procedure.

Adult↗

Antibody accumulation in small tissue samples: assessment by quantitative autoradiography.

Uptake of radiolabeled 125I monoclonal antibodies in small metastases can only be characterized by autoradiographic techniques. To obtain quantitative data out of autoradiographic images, a transformation of the essentially two-dimensional signal into the Bq per unit volume information is needed. Part of the calibration problem could be solved by using tissue-equivalent standard preparations. However, when aiming at a quantification of radioactivity in small areas (less than or equal to 2 mm diameter), special criteria had to be expanded upon for the reconstruction of the area in the dose matrix and for the correct integration of the radioactivity content.

Animals↗

[Exclusion diet in Crohn disease: a controlled, randomized study].

In a controlled study patients with Crohn's disease received an exclusion diet or an diet low in refined carbohydrates and rich in fiber. A total of 26 patients was observed for 1 year. The exclusion diet was not significantly superior to the standard diet with respect to the clinical course (Crohn's disease activity index according to Best or van Hees) or laboratory parameters of inflammatory activity. During dietary counselling relapses were infrequent and symptoms improved in both dietary groups.

Crohn Disease↗

Quantitation of antibody uptake in spontaneous metastases.

A procedure of high resolution quantitative autoradiography was established and tested in the murine ESb-Mp lymphoma system. Using 125I-labelled antibody 12-15A, liver metastases with diameters down to 100 microns were identified and intralesional radioiodine accumulation was assessed as % injected dose (iD) g-1. Uptake was found to be highest in intermediate size metastases, i.e., up to 100% iD g-1 in 1 mm lesions, while it gradually declined with both increasing and decreasing diameters of metastases. Lower uptake in large size metastases was due to a marked non-uniformity in radioactivity retention, while lower uptake in small metastases was possibly due to insufficient access of the antibody to intrahepatic processes which have not yet established an autonomous blood supply.

Animals↗