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R C Verschueren

Publications and source records attributed to R C Verschueren.

39 records · Page 3Linked to original sources

Thymidylate synthase levels in tumor biopsies from patients with colorectal cancer.

Catalytic activity and FdUMP binding characteristics of thymidylate synthase (TS) were determined in 22 tumor biopsies of patients to be treated (15) or just treated (7) for colorectal cancer with 5-fluorouracil and leucovorin. In 19 samples both parameters could be determined and were found to represent a wide range (15-20 fold). High values of activity correlated with no response, but low values of binding or activity were found in responders as well as in non-responders. It is concluded that the determination of parameters related to TS function is feasible in tumor biopsies and its relevance for clinical management deserves further study.

Adult↗

Neo-adjuvant chemotherapy with carboplatin, 4-epiadriamycin and teniposide (CET) in locally advanced cancer of the cardia and the lower oesophagus: a phase II study.

Disappointing results after surgery alone for locally advanced adenocarcinoma of the cardia and the distal oesophagus (stage IIIB/IV) prompted us to combine surgery with neo-adjuvant chemotherapy. With a remission rate of about 70% the combination of etoposide, adriamycin and cisplatin (EAP) has been considered to be the superior treatment, but it has inherent severe toxicity. The authors conducted a phase II study of combined treatment with Carboplatin, 4-Epiadriamycin and Teniposide (CET) to ameliorate this toxicity and to evaluate the effectivity of this regimen in patients with these unresectable tumours. A regimen of 4 cycles of Carboplatin 300mg/m2, 4-Epiadriamycin 80mg/m2 and Teniposide 100mg/m2 was administered intravenously. Treatment cycles were repeated every 3 weeks in patients with initially unresectable adenocarcinoma of the gastro-oesophageal junction proven at laparotomy and/or CT scanning. Nineteen patients were studied and 17 underwent a second laparotomy in an attempt to resect the tumour radically. Eleven patients (65%) of the re-explored group achieved tumour reduction, enabling resection with curative intent. Recurrences, however occurred in 9 patients after a median of 9.5 (4-42) months. One patient died postoperatively as a result of pulmonary embolism. Only one patient remained free of disease after 42+ months. Leucopenia and thrombocytopenia of WHO grade 23 occurred in 58% and 37% of the patients, respectively. This regimen appears to be effective in patients with locally advanced adenocarcinoma of the cardia and the distal oesophagus. Although it can be used in an outpatient setting, the overall toxicity is relatively high and the results are comparable with other less toxic regimens.

Adult↗

The anatomical substrate for a difference in surgical approach to rectal cancer in male and female patients.

This review emphasizes' gender related anatomical differences warranting a difference in surgical approach to the problem of rectal cancer in men and women. Differences in the anatomy of the bony pelvis, the pelvic viscera and the lymphatics of the rectum, inspired the authors to extend the margins of the rectal resection in the anterior plane in female patients. Between 1978 and 1992 a rectal resection was carried out for cancers confined to the pelvis in 158 patients. Of these patients 152 were available for review, 95 male and 57 female. In 24 out of 57 female patients extension of the rectal resection towards the genital tract by en bloc excision of posterior vaginal wall and/or uterus was considered necessary to be confident about obtaining tumour free margins. After a median follow-up of 8 years the risk of local recurrence and cancer related death were significantly lower in female patients.

Female↗