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Biomedical subjects

D Sloan

Publications and source records attributed to D Sloan.

60 records · Page 4Linked to original sources
PubMedDate not supplied

Pigmented melanocytic schwannoma of the uterine cervix.

A 47-year-old woman had a lesion of the uterine cervix that presented clinically as a protruding or aborted leiomyoma. Grossly the tumor occupied a substantial portion of the cervical and endocervical region. Histologically it showed a spindle cell neoplasm arranged in large fascicles that penetrated deeply into the fibromuscular wall of the cervix. The tumor cells had abundant pink cytoplasm that contained considerable brown melanin granules confirmed by Fontana's stain. Cytologically nuclear pleomorphism, hyperchromatism, and giant nuclear forms were observed. Mitoses were also seen. Localized nuclear palisading was present. Electron microscopic examination of paraffin-embedded material revealed numerous premelanosomes and opaque granules that were compatible with mature melanosomes, thus confirming melanogenesis in the tumor. Tumor cells exhibited focal projections, and the connective tissue showed abnormal spacing of collagen. Basal lamina material was noted focally on tumor cell surfaces. Immunocytochemistry showed a positive reaction to S-100 protein and HMB-45 in tumor cell cytoplasm.

Cell Nucleus↗
PubMedDate not supplied

Ornithine decarboxylase and polyamines in colorectal neoplasia and mucosa.

Ornithine decarboxylase (ODC) and polyamines are intimately involved in normal cellular proliferation and are likely to play a role in carcinogenesis. ODC activity and polyamine content were measured in tissue samples obtained during colonoscopy from 48 benign neoplastic polyps (20 tubular adenomas; 28 villous adenomas), 18 cancers (including 5 malignant polyps), and adjacent mucosa. ODC activity in polyp and cancer tissue specimens was higher than in adjacent mucosa in 75 and 83% of pairs, respectively. Similarly, putrescine, spermidine, and spermine contents were higher in the majority of polyps and cancers compared to adjacent mucosa. ODC activity and polyamine content in colonic mucosa from 10 patients without a history of colorectal neoplasia were not different from adjacent mucosal values in the patients with neoplasia. In conclusion, ODC and polyamines are elevated in the majority of colorectal neoplasms, but amounts in normal mucosa do not differentiate between patients with cancer, benign neoplastic polyps, and normal subjects.

Adenoma↗
PubMedDate not supplied

Detection of benzodiazepine abuse in opiate addicts.

There is an increasing problem with benzodiazepine co-abuse in the opiate dependent population of Dublin. The importance of early detection of this co-abuse is essential as there is an increased risk of dangerous injecting practices such as sharing of needles and criminality in those who co-abuse benzodiazepines and opiates. This study was carried out in the National Drug Treatment Centre, Dublin. It aims to describe the current difficulties in identifying the co-abuse of short acting benzodiazepines including flunitrazepam in a cohort of opiate dependent patients. Using a sample of those attending the clinic it was discovered that standard methods of urinalysis failed to identify 10% of co-abuse. For those patients whose abuse of flunitrazepam is undetected on screening, clinical interventions which aim to minimise the consequence of the co-abuse and reverse the chaotic drug using patterns fail to be put in place at the earliest possible time.

Ambulatory Care Facilities↗