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Biomedical subjects

W C Hop

Publications and source records attributed to W C Hop.

316 records · Page 18Linked to original sources
PubMedDate not supplied

Colorectal cancer recurrence and perioperative blood transfusions: a critical reappraisal.

The last 2 decades the immunomodulatory effect of blood transfusions has been investigated intensively. The effect of blood transfusions on the prognosis of colorectal cancer patients is reviewed in this paper. We made an evaluation of the material from animal and from clinical studies present in the literature. The results from clinical randomized trials dealing with this subject, which have been published recently, are discussed as well.

Animals↗
PubMedDate not supplied

The influence of intramedullary nailing upon the development of metastases in the treatment of an impending pathological fracture: an experimental study.

An experimental model has been developed in which the effects of a pathological fracture and intramedullary nailing on metastatic spread have been investigated. The endpoint used was the production of lung metastases in rats inoculated intracortically with a rhabdomyosarcoma. We have found that a pathological fracture markedly increases the incidence of lung metastases and that intramedullary nailing, by decreasing the incidence of fractures, decreases the incidence of lung metastases. The surgical procedure itself does not increase the incidence significantly. It is concluded that in metastatic disease prophylactic nailing of an impending pathological fracture is the treatment of choice.

Animals↗
PubMedDate not supplied

The effect of blood transfusions on survival after surgery for colorectal cancer.

The immunosuppressive effect of allogeneic blood transfusions can be associated with a poor prognosis for cancer patients. Predeposit autologous blood transfusions could be a solution to overcome this putative deleterious effect. We performed a randomised clinical study to compare the effects of autologous with allogeneic blood transfusions in colorectal cancer patients. There was no significant difference in disease-free survival between both randomisation arms. However, the transfused patients had a significantly shorter disease-free interval as compared with the non-transfused patients. This association of transfusions with recurrent disease was only the case for local recurrences, whereas the incidence of distant metastases was unaffected. We conclude that the use of a predeposit autologous blood transfusion programme does not improve the prognosis in colorectal cancer patients. The negative association between blood transfusions and cancer recurrence is only true for local recurrences, which suggests that not the blood transfusions themselves but rather the circumstances necessitating them are the real predictors of prognosis.

Adult↗
PubMedDate not supplied

Routine psychophysiological screening of 384 men with erectile dysfunction.

Psychophysiological screening was carried out on 384 consecutive patients with erectile dysfunction of psychogenic or psychogenic-organic origin. Visual sexual stimulation with penile vibration caused a satisfactory erection in roughly 50% of patients. Nonresponders subsequently produced a good penile response with intracavernous injection of vasoactive substance. Orgasm-ejaculation can occur in the absence of a full erection. In such cases subsequent intracavernous injection brought about a (near) full erection. A first intracavernous injection was most effective when combined with visual and vibrotactile stimulation. The magnitude of the response to such stimulation is useful to enable the doctor to prescribe the lowest dose of a vasoactive substance, thus minimizing the risk of priapism. Preferably, drug treatment of men with erectile dysfunction should be combined with sexual counseling or therapy.

Adult↗
PubMedDate not supplied

P53 overexpression in colorectal metastases confined to the liver and outcome of liver resection.

BACKGROUND/AIMS: The results of hepatic surgery for colorectal metastases are distorted by the high incidence of recurrence, despite an apparently radical resection. Selection of high-risk patients is a mandatory step towards effective application of neo-adjuvant chemotherapy. In this study, expression of the tumor suppresser gene p53 in colorectal liver metastases was correlated with recurrence after resection. METHODOLOGY: In a retrospective case-series p53 expression was assessed using standard immunohistochemical methods in the paraffin-embedded specimens of 45 liver resections for colorectal metastases, performed in 43 patients in a single institution between '86 and '96. Hospital and office charts were reviewed and follow-up was completed with a General Physicians' questionnaire in October '97. Relapse-free and cancer-specific survival from diagnosis of hepatic metastases were assessed and compared for p53+ and p53- groups. RESULTS: Median survival was 36 months with an estimated 5-year cancer-specific survival of 43% (95% confidence interval 35%-51%). Relapse-free and cancer-specific survival were not significantly different between p53+ (n = 24, 53%) and p53- (n = 21) groups (P = 0.86 and P = 0.91 respectively). P53 expression was not associated with other potential predictors, which were not of predictive value either. CONCLUSIONS: Patients at risk for recurrent disease following partial hepatectomy for colorectal metastases cannot be identified by p53 expression.

Adenocarcinoma↗
PubMedDate not supplied

DNA ploidy as a prognostic factor for patients with an adenocarcinoma in Barrett's esophagus.

BACKGROUND/AIMS: The role of DNA ploidy of tumor cells as a prognostic factor for survival after resection was evaluated in 40 patients with an adenocarcinoma in Barrett's esophagus (28 men and 12 women; mean age, 61 years). MATERIALS AND METHODS: After resection of the esophagus, staging was performed according to the TNM-classification (UICC 1987). Tumor tissue specimens were reviewed for the histological differentiation grade and flow cytometry was performed on paraffin embedded tissue according to the method described by Hedley. RESULTS: There was no significant correlation between DNA-ploidy and TNM-stage or histological differentiation grade of the tumor. DNA ploidy, stage and grade as prognostic factors for the survival were evaluated by multivariate analysis. DNA ploidy significantly (p= 0.04) correlated with survival, also univariately. Patients with diploid tumors had 3- and 5-year survival rates of 51% and 25% respectively, as compared to 10% and 0% respectively for patients with aneuploid or tetraploid/increased G2 tumors. CONCLUSION: DNA ploidy is an independent prognostic factor for the survival of patients with an adenocarcinoma in Barrett's esophagus.

Adenocarcinoma↗