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Biomedical subjects

J Einhorn

Publications and source records attributed to J Einhorn.

At least 19 recordsLinked to original sources
PubMed1992

Genotoxic effectivity--comparison of 36 nitrated furan and arenofuran derivatives on a quantitative scale. Statistical comparison of T7 and other short-term tests.

Thirty-six nitrated furan and arenofuran derivatives were measured and quantitatively characterized by the T7 inactivation test. A wide range of substances previously studied allowed us to compare the collected quantitative data with those obtained by other workers using different short-term tests. Based on comparative statistical evaluation of these data a borderline was determined for the genotoxic effect: compounds having in our short-term test mutagenicity index (MI) values smaller than 8.0 are positive while the higher values represent negative genotoxicity. Classification of 36 nitrofuran/nitroarenofuran derivatives is given both on the basis of the quantitative genotoxicity scale and in terms of +/- on the qualitative scale. All but one compound were found to be genotoxic and the genotoxic activities of these compounds were compared with the results of other carcinogenicity or mutagenicity tests.

Carcinogenicity Tests↗
PubMed1987

Multimodality treatment in anaplastic giant cell thyroid carcinoma.

Anaplastic giant cell thyroid carcinoma is highly malignant. Surgery, chemotherapy, or radiotherapy used separately have not been effective. Combinations of the three modalities have been used at Radiumhemmet since the middle of the 1970s. Nine patients received three-drug chemotherapy and radiotherapy. One patient was alive after 12 years; eight died. Twenty-five patients were given a similar regimen (with two fractions of radiotherapy per day), aiming at surgery. Twelve patients could undergo surgery. Two were alive 11 and 3.5 years after diagnosis. One patient died free of tumor after 6.5 years. Of the remaining 22 patients, many died of metastatic disease. A combination of preoperative and postoperative radiotherapy, chemotherapy (bleomycin, cyclophosphamide, and 5-fluorouracil) and surgery during the remission has given a 12% (four of 34) survival (greater than 3 years). All survivors had undergone surgery. The patients who died had in many cases achieved local tumor control. Adriamycin (Adria Laboratories, Columbus, OH) once a week replaced BCF due to treatment complications in patients receiving BCF. Of five patients, only one was alive more than 10 months after treatment.

Bleomycin↗
PubMed1987

Comparison of the carcinogenic effects of two 2-nitro-naphthofurans injected sub-cutaneously in rats.

7-Methoxy-2-nitro-naphtho[2,1-b]furan (R 7000) and its methylated homolog in position 1 (R 7372) are among the most mutagenic agents presently known, as shown by the results obtained both in the Ames test and in the SOS Chromotest. Their carcinogenic effects were tested in rats. We were able to confirm the carcinogenic effects of these nitro-naphthofurans, the presence of a methyl group--while increasing the mutagenic effect of R 7000 10 times--induces a significant decrease of the carcinogenic effects in R 7372. The discrepancy between the mutagenic effects in bacterial assays and the carcinogenic effects of these two 2-nitro-naphthofurans remains to be explained.

Animals↗
PubMed1986

Thyroid carcinoma in children and adolescents.

Forty patients aged 20 years or younger at the time of the diagnosis of thyroid carcinoma were followed between 10 and 35 years (mean, 22 years). All patients had had surgery, either a total thyroidectomy or a resection. Sixteen patients received additional radiotherapy. One patient died during surgery. Two patients died of metastatic tumor growth, 5 and 14 years after the primary diagnosis, respectively. Six further patients had recurrences (1-7.5 years after first treatment) and received further treatment. At the end of the study 37 patients were alive without signs of recurrence.

Adolescent↗