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D N Poller

Publications and source records attributed to D N Poller.

41 records · Page 3Linked to original sources
PubMed1992

Epidermal growth factor receptor expression in Barrett's esophagus.

Six cases of known Barrett's esophagus were examined immunohistochemically for the presence of epidermal growth factor receptor. All cases showed expression of epidermal growth factor receptor in intestinal metaplastic Barrett's epithelium, the most common form of Barrett's change. Expression of epidermal growth factor receptor may be important in neoplastic transformation in Barrett's esophagus, possibly by an autocrine mechanism. Alternatively, epidermal growth factor receptor expression in intestinal metaplastic Barrett's epithelium may represent a nonneoplastic regenerative phenomenon as seen at other sites within the gastrointestinal tract. Further larger studies are required to assess the clinical significance of these findings.

Barrett Esophagus↗
PubMed1991

Nuclear and flow cytometric characteristics associated with overexpression of the c-erbB-2 oncoprotein in breast carcinoma.

The overexpression of the c-erbB-2 oncoprotein is now thought by most authors to be associated with adverse prognosis in breast carcinoma. In this study, we investigate the relationship between overexpression of the c-erbB-2 oncoprotein and nuclear size by morphometry in a series of 150 human breast carcinomas, comprising 65 cases of ductal carcinoma in situ (DCIS) and 85 cases of invasive adenocarcinoma. The mean nuclear size for c-erbB-2 positive cases of DCIS was 54.8 micron 2 and invasive carcinoma was 52.1 micron 2 respectively, in contrast with 41.6 micron 2 and 42.5 micron 2 for c-erbB-2 negative cases of DCIS and invasive carcinoma respectively. Flow cytometric examination of DNA in a subset of 91 of these tumours showed no association between tumour cell aneuploidy and c-erbB-2 overexpression. S-phase fraction could be calculated on 20 cases of DCIS and 48 invasive carcinomas. There was a strong association between c-erbB-2 overexpression, S-phase fraction (p less than 0.001) and proliferative index (p less than 0.001) in 20 cases of DCIS. A weak association of S-phase fraction and c-erbB-2 overexpression was seen in 48 invasive carcinomas (p = 0.047). This study confirms the subjective impression that there is a relationship between large tumour cell nuclear size and an overexpression of the c-erbB-2 oncoprotein, and also shows an association with increased tumour cell proliferation.

Adenocarcinoma↗
PubMed1989

Bacterial calcification in infective endocarditis.

The present report is the first description to our knowledge of a clinical case of bacterial calcification in human infective endocarditic vegetations. Partial calcification of bacteria within vegetations may be a further mechanism of bacterial protection from host defences and antibiotics. Similar calcification has recently been reported in vegetations formed on porcine valvular prostheses implanted experimentally in sheep.

Aged↗