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J C van Mourik

Publications and source records attributed to J C van Mourik.

At least 19 recordsLinked to original sources
PubMed2003

Emergency resection of an extra-adrenal phaeochromocytoma: wrong or right? A case report and a review of literature.

Phaeochromocytomas are rare neuroendocrine tumours that produce symptoms through excess release of catecholamines. Treatment of choice is elective, complete surgical removal after pretreatment with alpha-adrenergic blocking drugs, to prevent dangerous haemodynamic fluctuations. In rare cases a 'catecholamine crisis' develops presenting with pulmonary oedema and circulatory shock. We report such a case of a patient with familial extra-adrenal phaeochromocytoma who successfully underwent emergency surgery. Pathophysiological mechanisms are discussed. Although pretreatment with alpha-adrenergic blocking drugs seems advisable in terms of morbidity and mortality, the concept is based on theory rather than clinical evidence. Surgical management of a catecholamine crisis is associated with high mortality rates. However, proof of better outcome by avoidance or discontinuation of emergency surgery is not available. Based on literature and on this case, we conclude that emergency surgery in phaeochromocytoma does not have to be structurally avoided and may be considered under life-threatening circumstances.

Adrenal Gland Neoplasms↗
PubMed2002

Practice, efficacy and cost of staging suspected non-small cell lung cancer: a retrospective study in two Dutch hospitals.

BACKGROUND: A study was undertaken to investigate the clinical practice, yield, and costs of preoperative staging in patients with suspected NSCLC and to obtain baseline data for prospective studies on the cost effectiveness of (18)F-fluorodeoxyglucose positron emission tomography in the management of these patients. METHODS: A retrospective study of the medical records of all patients with suspected NSCLC was performed during a 2 year interval (1993-4) in an academic and a large community hospital. RESULTS: Three hundred and ninety five patients with suspected NSCLC were identified; 58 were deemed to be medically inoperable and 337 patients proceeded to the staging process. Staging required a mean (SD) of 5.1 (1.5) diagnostic tests per patient (excluding thoracotomy) carried out over a median period of 20 days (IQR 10-31). Many of the tests (including both invasive and non-invasive) were done because previous imaging tests had suggested metastases, and in most cases the results of initial tests proved to be false positives. After clinical staging, 168 patients were considered to be resectable (stage I/II) and 144 patients underwent surgery with curative intent. At surgery 33 patients (23% of those who underwent surgery) were found to have irresectable lesions and 19 (13%) had a benign lesion. Surgery was also considered to be futile in 22 patients (15%) who developed metastases or local recurrence within 12 months following radical surgery. Hospital admission was responsible for most of the costs. CONCLUSION: In many patients staging involved considerable effort in terms of the number of diagnostic tests, the duration of the staging period and the cost, with limited success in preventing futile surgery. Failures relate to the quality of diagnostic preparation at every level of the TNM staging system.

Adult↗
PubMed2001

Clonally related but phenotypically divergent human cancer cell lines derived from a single follicular thyroid cancer recurrence (TT2609).

Starting from different regional samples taken from a heterogeneous follicular thyroid cancer recurrence in a male patient, a series of cell cultures was initiated. Three stable cancer cell lines were successfully established (TT2609-A02, TT2609-B02, and TT2609-C02) and kept in continuous culture for more than 3 years. The lines are each characterized by a unique set of biological parameters such as morphology, ploidy state, cell proliferation rate, ultrastructure, thyroid marker expression, p53 expression, karyogram, agar clonogenic capacity and tumorigenicity as xenografts in nude mice. These characterization studies point to a marked heterogeneity at the level of the clinical tumor recurrence. Karyotype analysis of the cell lines showed a pattern of aberrations indicating that the lines are clonally related and that the A02 and C02 lines are subsequently derived from the more "original" tumor cell type B02 after a tetraploidization event. It is concluded that the obtained cell lines represent an in vitro/in vivo model for human follicular thyroid cancer. The availability of a series of cell lines for human follicular thyroid cancer, mimicking the biological heterogeneity observed in patient tumors, enables both detailed fundamental investigation of thyroid cancer cell biology and the experimental exploration of new treatment approaches.

Animals↗
PubMed2001

Autofluorescence bronchoscopy improves staging of radiographically occult lung cancer and has an impact on therapeutic strategy.

BACKGROUND: The ability of conventional CT scans and fiberoptic bronchoscopy to localize and properly stage radiographically occult lung cancer (ROLC) in the major airways is limited. High-resolution CT (HRCT) scanning and autofluorescence bronchoscopy (AFB) may improve the assessment of ROLC before the most appropriate therapy can be considered. PATIENTS AND METHODS: We prospectively studied 23 patients with ROLC, who were referred for intraluminal bronchoscopic treatment (IBT) with curative intent. Additional staging with HRCT and AFB was performed prior to treatment. Twenty patients were men, 9 patients had first primary cancers, and 14 patients had second primary cancers or synchronous cancers. RESULTS: HRCT scanning showed that 19 patients (83%) had no visible tumor or enlarged lymph nodes. With AFB, only 6 of the 19 patients (32%) proved to have tumors < or = 1 cm(2) with visible distal margins. They were treated with IBT. In the remaining 13 patients, abnormal fluorescence indicated more extensive tumor infiltration than could be seen with conventional bronchoscopy alone. Six patients underwent radical surgery for stage T1-2N0 (n = 5) and stage T2N1 (n = 1) tumors. Specimens showed that tumors were indeed more invasive than initially expected. The remaining seven patients technically did not have operable conditions, so they were treated with external irradiation (n = 4) and IBT (n = 3). The range for the time of follow-up for all patients has been 4 to 58 months (median, 40 months). The follow-up data underscore the correlation between accurate tumor staging and survival. CONCLUSIONS: Our data showed that 70% of patients presenting with ROLC had a more advanced cancer than that initially diagnosed, which precludes IBT with curative intent. Additional staging with HRCT and AFB enabled better classification of true occult cancers. Our approach enabled the choice of the most appropriate therapy for each individual patient with ROLC.

Aged↗
PubMed2000

[Thoracoscopic clipping of thoracic duct in a woman with persisting chylothorax].

A 78-year-old female had chest pain, radiating to the back, caused by a thoracic aneurysm of the aorta. A vascular prosthesis was sutured into place through a left-sided thoracotomy. Six days after the operation she developed chylothorax on the right side. Following 14 days of conservative management, chyle leakage persisted at a rate of 1500 ml per 24 hours. By thoracoscopy the thoracic duct was dissected and clipped, which stopped the chyle leakage. The patient recovered moderately well. Conservative measures, such as adjusted nutrition, are successful in 50% of patients. Clipping of the thoracic duct by thoracoscopy is a definitive and minimally invasive procedure to treat persistent chyle leakage.

Aged↗
PubMed2000

Positron emission tomography for the detection of metastases of differentiated thyroid carcinoma.

OBJECTIVE: To show the value of positron emission tomography (PET) with 18-F-fluorodeoxyglucose (18-FDG) for the detection of metastases of differentiated thyroid carcinoma in selected patients. PATIENT HISTORIES: There were four patients, who had undergone total thyroidectomy for papillary (two) or follicular thyroid carcinoma (two). All patients had subsequent treatment with (131)iodine. Three patients had an increasing serum concentration of thyroglobulin, one patient had antibodies against thyroglobulin. A diagnostic (131)iodine scintigraphy was negative in two patients, and uncertain in two patients. Positron emission tomography was performed about 45 min after administration of 10 mCi 18-F-fluorodeoxyglucose. In three patients PET showed uptake in the cervical region, caused by lymph node metastases in two (confirmed by neck dissection) and recurrent tumor on the trachea in one patient (confirmed by surgery). In the fourth patient uptake of 18-FDG was seen in the neck and in both lungs. This led to discontinuation of treatment with (131)iodine because the lung metastases did not accumulate (131)iodine. DISCUSSION: In selected patients with differentiated thyroid carcinoma with an increasing serum concentration of thyroglobulin, PET is an important diagnostic option when scintigraphy with (131)iodine is negative or uncertain. In the four presented case histories, the results of PET led to a therapeutic decision: surgery in three patients and discontinuation of (131)iodine in one patient. The development of guidelines for the use of PET in the diagnosis of recurrent thyroid cancer is discussed.

Adenocarcinoma, Follicular↗
PubMed1999

[Role of chemo(radio)theray prior to surgery for stage IIIa non-small cell lung carcinoma (localized non-resectable tumor)].

Neoadjuvant chemotherapy with or without combined radiotherapy followed by surgery may yield a survival profit for selected patients with non-small cell lung carcinoma in stage IIIA. It has not yet been established which is the most efficacious neoadjuvant chemotherapy nor what is the best postneoadjuvant chemotherapy, especially resection or radiotherapy. Comparative clinical studies to find the answer to these two questions are in progress. New forms of treatment are required in order to achieve 5-year survival in more stage IIIA patients than is currently the case.

Carcinoma, Non-Small-Cell Lung↗
PubMed1998

Bronchoscopic treatment of intraluminal typical carcinoid: a pilot study.

OBJECTIVE: The curative potential of various bronchoscopic treatments such as Nd:YAG laser, photodynamic therapy, and brachytherapy for the treatment of intraluminal tumor has been reported previously. Bronchoscopic treatment can be used to treat small intraluminal tumor with curative intent, such as in patients with roentgenologically occult squamous cell cancer. In a retrospective study, we showed that bronchoscopic treatment provided excellent local control with surgical proof of cure in 6 of 11 patients with intraluminal typical bronchial carcinoid. METHODS: In a prospective study, 19 patients (8 women and 11 men) with resectable intraluminal typical bronchial carcinoid have undergone bronchoscopic treatment under general anesthesia. Median age was 44 years (range, 20-74 years). If tumor persisted after 2 bronchoscopic treatment sessions, surgery was performed within 4 months after the treatment. RESULTS: Bronchoscopic treatment was able to completely eradicate tumor in 14 of the 19 patients (complete response rate 73%, 95% CI: 49%-91%). Median follow-up of these patients is 29 months (range, 8-62 months). One patient had severe cicatricial stenosis after bronchoscopic treatment, and sleeve lobectomy was necessary. No residual carcinoid was found in the resected specimen. In the remaining 5 patients, bronchoscopic treatment did not result in a complete response and radical surgical resection was performed afterward with confirmation of residual carcinoid in the resected specimen. Median follow-up of the surgical group is 34 months (range, 12-62 months). CONCLUSIONS: Current data suggest that bronchoscopic treatment may be an effective alternative to surgical resection in a subgroup of patients with resectable intraluminal typical bronchial carcinoid. It alleviated the necessity of surgical resection in 68% (95% CI: 43%-87%) of the patients.

Adult↗
PubMed1998

Radiographically occult lung cancer treated with fibreoptic bronchoscopic electrocautery: a pilot study of a simple and inexpensive technique.

The curative potential of bronchoscopic intervention, e.g. photodynamic therapy (PDT) and brachytherapy, for resectable radiographically occult lung cancer has been reported previously. Bronchoscopic electrocautery is currently feasible using an insulated flexible bronchoscope to coagulate and vaporize tumour tissue. Since the lesions are usually small, noninvasive bronchoscopic electrocautery may be able to eradicate radiographically occult lung cancer completely. In a prospective study, 13 patients with 15 radiographically occult lung cancer lesions were treated with bronchoscopic electrocautery. The duration of follow-up was > or = 16 months. The median age of the patients was 69 yrs (range 48-79 yrs). Fibreoptic bronchoscopy under local anaesthesia was used to coagulate the occult lung cancer. Approximately 30 W of energy was applied until visible necrosis of the tumour area became apparent. There were no immediate complications. In 10 patients with 12 lesions, a complete response (CR) was obtained (CR rate 80%; 95% confidence interval (95% CI) 52-96%). Median duration of follow-up was 21 months (range 16-43 months). Bronchoscopic electrocautery did not obtain a CR in the remaining three patients, but PDT also failed to achieve CR. Two patients underwent radical resection, and the tumours were histologically confirmed to be more invasive. One patient received external radiotherapy. Three patients with a CR died during follow-up, two as a result of myocardial infarction and apoplexy, and one because of metastasis from his previously resected T3N1 primary large cell cancer. Current data show bronchoscopic electrocautery to be equally effective and potentially as curative as photodynamic therapy for treating patients with radiographically occult lung cancer. Obvious advantages are that it is an inexpensive and simple procedure, which does not cause photosensitivity.

Aged↗
PubMed1997

The influence of fixation delay on mitotic activity and flow cytometric cell cycle variables.

Proliferation variables such as mitotic activity and the percentage of S-phase cells have been shown to be of prognostic value in many tumors, especially in breast cancer. However, some studies reported a decrease in mitotic activity caused by delay in fixation of the tissue. In contrast, other studies showed that the identifiability of mitotic figures decreases after fixation delay, but the total number of mitotic figures and also the percentage of S-phase cells remain unchanged. Most studies have been done on small numbers of experimental tumors, thus introducing the risk of selection bias. The aim of this study was to reinvestigate the influence of fixation delay on mitotic activity and cell cycle variables assessed by flow cytometry in an adequate number of resected human tissues to reach firmer conclusions. Resection specimens of 19 and 21 cases, respectively, for the mitotic activity estimate and the flow cytometric percentage of S-phase calculation were collected directly from the operating theater using lung, breast, and intestinal cancers and normal intestinal mucosa. The tissues were cut in pieces, and from each specimen, pieces were fixed in 4% buffered formaldehyde (for mitosis counting) as well as snap frozen (for flow cytometry) immediately after excision, as well as after a fixation delay of 1, 2, 4, 6, 8, 18, and 24 hours. Moreover, during the fixation delay, one series from each specimen was kept in the refrigerator and the second at room temperature. Thus, a total of 304 (19 X 16) and 336 (21 X 16) specimens were investigated for the mitotic activity estimate and the percentage of S-phase cells calculation, respectively. With regard to the estimation of the mitotic activity, both clear and doubtful mitotic figures were registered separately, obtaining an "uncorrected" and "corrected" (for doubtful mitotic figures) mitotic activity estimate. The percentage of S-phase cells was obtained by cell cycle analysis of flow cytometric DNA-histograms. The results showed that the quality of the material decreased during the fixation delay, as reflected by poorer cellular morphology in the hematoxylin-and-eosin-stained slides, resulting in more difficult identification of mitotic figures and a more time-consuming procedure with regard to the mitosis counts, but not in a worse intraobserver and interobserver reproducibility, which was acceptable. The reduction in quality of the tissues also was shown by the flow cytometric measurements because the coefficient of variation and percentage of debris increased after 4 hours or more of fixation delay. However, the mean values of the "uncorrected" mitotic activity and the "corrected" mitotic activity showed no decreasing trend; neither did the average percentage of S-phase cells. In conclusion, within the time investigated, fixation delay has no clear influence on the proliferation features studied. Because of the decreasing quality of the histological sections, resulting in more difficult identification of mitoses and interpretation of DNA histograms, fixation delay should be kept as short as possible, keeping the tissue at 4 degrees C until fixation.

Flow Cytometry↗
PubMed1997

Prognostic value of the expression of p53, bcl-2, and bax oncoproteins, and neovascularization in patients with radically resected non-small-cell lung cancer.

PURPOSE: To assess the prognostic value of p53, bcl-2, bax, and neovascularization in radically resected non-small-cell lung cancer (NSCLC) patients. PATIENTS AND METHODS: Tumors from 116 patients were assessed by immunohistochemistry for expression of p53 (DO7 and PAb1081), bcl-2, and the quantification of microvessel density (CD-31). In addition, the expression of bax was assessed in 61 stage I tumors. The median levels of expression of each marker were used as cutoff points. RESULTS: p53 was not correlated to any patient or tumor characteristic, whereas bcl-2 showed higher expression in squamous cell carcinomas (P < .001). bax expression was significantly related with male sex (P = .006) and adenocarcinoma type (P = .0013). p53 status, assessed with one monoclonal antibody (MoAb), was not predictive for survival; however, the combination of staining results obtained with two MoAbs identified the DO7-/PAb1801+ tumors as those with the worst prognosis. bcl-2 expression was associated with longer survival in stage I patients (P = .0169). The combined group expressing p53+(PAb1801)/bcl-2- had the worst survival in stage I patients (P = .034) and in the whole series in comparison with the other combinations of the two oncoproteins. bax expression alone had no influence on survival of stage I patients, but patients with bax+/bcl-2- tumors had the worst prognosis (P = .02 in comparison with bax+/bcl-2+). Tumor neovascularization was not related with other factors, and patients with CD-31+ tumors had a shorter survival duration than those with CD-31- tumors only in stage II (P = .0283). By multivariate analysis including all patients, the presence of p53+/ bcl-2- tumor expression and large tumor diameter (> or = 4cm) were independent prognostic factors for shorter survival duration. For stage I, only the presence of bax+/ bcl-2- tumor expression had a significant negative influence on survival. CONCLUSION: The interaction and the regulation of new biologic markers, such as those involved in the apoptotic pathway, are complex. Combinations of the expression of several of them may give more valuable information than the study of just one. Prognostic influence of p53 staining varied depending on the choice of antibody and the combination of bcl-2- together with p53+ (PAb1801) or with bax+ had the worst influence on survival for patients with stage I NSCLC.

Aged↗
PubMed1996

Cost-effectiveness of video-assisted thoracoscopic surgery versus conservative treatment for first time or recurrent spontaneous pneumothorax.

The aim of this study was to analyse differences in efficacy and costs in treating first time or recurrent spontaneous pneumothorax by conservative therapy (pleural drainage or observation) and video-assisted thoracoscopic surgery (VATS). Retrospectively, 112 patients treated by conservative therapy during 1985-1989 (Period 1) were compared with 97 patients treated by VATS during 1991-1994 (Period 2). Mean follow-up time in each period was more than 2 yrs. Patients in both periods had comparable clinical characteristics. Irrespective of first time or recurrent spontaneous pneumothorax at presentation, drainage and hospitalization times were longer, and complication and recurrence rates were higher in Period 1. When costs due to the waiting time before VATS were excluded, the total costs in Period 1 were higher than in Period 2. Video-assisted thoracoscopic surgery is more effective in treating patients with first time or recurrent spontaneous pneumothorax, with less morbidity and total costs compared to conservative therapy. In view of cost-effectiveness, we feel that a different management of first time or recurrent spontaneous pneumothorax is not justified.

Adult↗
PubMed1994

[Satisfactory results of conservative treatment in traumatic esophageal perforation].

OBJECTIVE: Evaluation of diagnosis and management of 18 patients with iatrogenic or traumatic oesophageal perforation. DESIGN: Descriptive retrospective. SETTING: University hospital Vrije Universiteit Amsterdam. PATIENTS AND METHODS: In the period 1981-1991 18 patients received conservative treatment for iatrogenic/traumatic oesophageal perforation. RESULTS: The perforation was located in the cervical part of the oesophagus in 13 cases and in the thoracic part in 5 cases. Various incidents had led to the perforation. For radiological examination X-rays of the thorax or lateral neck were made or an oesophagogram using iodine as the contrast medium. Treatment consisted of antibiotics, a stomach catheter, intravenous nutrition and if necessary suction drainage. Seventeen patients recovered completely, one patient died. CONCLUSION: Conservative treatment of iatrogenic oesophageal perforation consisting of antibiotics, stomach catheter, enteric or parenteral nutrition and if necessary suction drainage gives good results.

Adult↗
PubMed1994

Skin lesions and an intrathoracic mass.

We describe a case of thoracic actinomycosis in a previously healthy man. The clinical features were a paramediastinal mass with skin lesions due to haematogenic dissemination. After parasternal mediastomy, the diagnosis was made. After treatment with penicillin, there was complete recovery.

Actinomycosis↗