PubMed Health⌕ Search

Biomedical subjects

J Lovas

Publications and source records attributed to J Lovas.

9 recordsLinked to original sources
PubMed2001

Impact of localized treatment in reducing risk of progression of low-grade oral dysplasia: molecular evidence of incomplete resection.

Currently, there is no consensus on the appropriate treatment for low-grade oral dysplasia. This is mainly due to the difficulty in predicting outcome for this heterogeneous group of lesions. In this study, we constructed a detailed clinical history of 66 mild and moderate dysplasias in order to determine how treatment affected outcome, and to evaluate the effect of treatment on lesions with different genetic profiles, which are defined by patterns of loss of heterozygosity (LOH) associated with low, intermediate and high risk of progression [Clin. Cancer Res., 6, 357-62, 2000]. The results showed that although treatment guided by clinical removal of leukoplakia reduced cancer progression risk in all three risk groups, the amount of reduction in our study group did not reach statistical significance. To assess whether completeness of lesion removal was a major factor in recurrence, repeat biopsies at the primary sites were analyzed for persistent LOH status on chromosomes 3p, 4q, 8p, 9p, 11q, 13q and 17p. Strikingly, eight of 17 cases judged clinically removed contained the same molecular clones in the initial and subsequent biopsies, suggesting incomplete removal. When molecular information was included in the assessment of lesion removal, treatment significantly reduced the risk of progression for cases with intermediate (P=0.043) and high risk (P=0.001) genetic profiles, but not cases with low-risk profiles. A 9.1-fold decrease in progression risk was observed for those with high-risk profile. Altogether, these data suggest the use of molecular profiles to guide the treatment of low-grade dysplasia. Our data also suggest that currently an inadequate margin may in part be responsible for the high rate of recurrence, especially in high-risk lesions.

Adult↗
PubMed2000

High frequency of allelic loss in dysplastic lichenoid lesions.

Oral lichen planus (OLP) is a common mucosal condition that is considered premalignant by some, whereas others argue that only lichenoid lesions with epithelial dysplasia are at risk of progressing into oral carcinoma. A recent study from this laboratory used microsatellite analysis to evaluate OLP for loss of heterozygosity (LOH) at loci on three chromosomal arms (3p, 9p, and 17p) (Am J Path 1997;Vol151:Page323-Page327). Loss on these arms is a common event in oral epithelial dysplasia and has been associated with risk of progression of oral leukoplakia to cancer. The data showed that, although dysplastic epithelium demonstrated a high frequency of LOH (40% for mild dysplasia), a significantly lower frequency of LOH was noted in OLP (6%), which is even lower than that in hyperplasia (14%). Such results do not support OLP as a lesion at risk for malignant transformation. As a second step of the research, we determined LOH frequencies in 61 dysplastic lichenoid lesions (mild 35; moderate 19; severe 7) using the same microsatellite markers and compared these results with data obtained from the first study and from 13 normal mucosal specimens. Dysplastic lichenoid lesions showed a high frequency of loss (54% for lichenoid lesions with mild dysplasia), but values did not differ significantly from those observed in dysplasia of similar degree without lichenoid appearance. None of the normal mucosa demonstrated LOH. Epithelial dysplasia is a sign of malignant risk, independent of lichenoid changes. Such results suggest that pathologists should search for dysplasia carefully in lesions that otherwise qualify as OLP and that caution should be used when discounting dysplasia as being merely a reactive condition in lichenoid lesions.

Adult↗
PubMed2000

Use of allelic loss to predict malignant risk for low-grade oral epithelial dysplasia.

One of the best approaches to identifying genetic changes critical to oral cancer progression is to compare progressing and nonprogressing oral premalignant lesions. However, such samples are rare, and they require long-term follow-up. The current study used the large archive network and clinical database in British Columbia to study loss of heterozygosity (LOH) in cases of early oral premalignancies, comparing those with a history of progression to carcinoma in situ or invasive cancer and those without a history of progression (referred to as nonprogressing cases). Each of 116 cases was analyzed for LOH at 19 microsatellite loci on seven chromosome arms (3p, 4q, 8p, 9p, 11q, 13q, and 17p). The progressing and nonprogressing cases showed dramatically different LOH patterns of multiple allelic losses. An essential step for progression seems to involve LOH at 3p and/or 9p because virtually all progressing cases showed such loss. However, LOH at 3p and/or 9p also occurred in nonprogressing cases. Individuals with LOH at 3p and/or 9p but at no other arms exhibit only a slight increase of 3.8-fold in relative risk for developing cancer. In contrast, individuals with additional losses (on 4q, 8p, 11q, or 17p), which appeared uncommon in nonprogressing cases, showed 33-fold increases in relative cancer risk. In conclusion, analysis of LOH at 3p and 9p could serve as an initial screening for cancer risk of early premalignancies. Follow-up investigation for additional losses would be essential for predicting cancer progression.

Chromosome Mapping↗
PubMed1992

Some possible gynaecological indications for peripheral antidopamine therapy.

The effect of the dopamine receptor blocking domperidone (Motilium) has been examined in 73 gynaecological patients in a wide indication field. The treatment was successful in controlling dyspeptic symptoms of different origins, nausea-vomiting of different etiologies, climacteric flushes, and in the prevention of migraines in 67.1% of the cases. Partial response was obtained in 19.2%, and no response in 13.7% of the cases. According to the opinion of the authors the gastrokinetic and antiemetic effect of domperidone is of high value, the use of the drug may be attempted as a monotherapy or an adjuvant therapy for the prevention of migraine and the treatment of climacteric flushes.

Adult↗
PubMed1991

Comparison of topical fungicides in women suffering from vulvovaginitis.

The effects of Nizoral cream and clotrimazole ointment have been compared under identical experimental conditions in 35 resp. 37 women suffering from mycotic vulvovaginitis. Nizoral tablet was administered as a basic therapy. Significant differences were not observed when comparing the results of the different 10-day long adjuvant therapies. Considering therapeutic action Nizoral cream was found to be equivalent to the successfully used clotrimazole ointment.

Administration, Intravaginal↗
PubMed1991

Klion infusion for controlling surgical and other bacterial gynaecological febrile complications.

The incidence of febrile infectious postoperative complications following Caesarean sections and gynaecological major operations during 2 two-year periods has been retrospectively analysed. In the operated group receiving Klion infusion as an adjuvant to postoperative therapy infectious febrile complication occurred only in 2.63% of the cases versus the 6.73% of the control period without Klion therapy. The acute period of febrile acute pelvic inflammations decreased to 1-2 days in women treated with Klion infusion as well, versus the 3-4 days of the control cases. The study proved that prevention and therapy with metronidazole infusion decrease the incidence of complications and inflammations in which anaerobic pathogens play an important to about 50%.

Adult↗
PubMed1983

Pterygopalatine fossa: computed tomographic studies.

The CT appearance of the pterygopalatine fossa is described in detail. Anatomic and CT sections were compared in cadavers and patients in axial and coronal CT planes to identify the osseous configuration and vascular and neural contents of the fossa. The normal fat, soft-tissue, and osseous margins are altered by neoplasms in the fossa. CT is an effective technique to evaluate the fossa and contiguous area.

Cadaver↗