No abstract

Residual tumor in the remnant liver after partial hepatectomy (PH) for colorectal liver metastases is a serious clinical problem. This fact is reflected by the high number of recurrences after potentially curative liver resections. Liver regeneration, it appears, might influence the growth of remaining micrometastases in the liver. Using rats, we demonstrated enhancement of growth of a syngeneic colon carcinoma (CC 531) in the remnant liver after Two PH. Fourteen days after PH, tumor weights in the liver were twice as high as those of sham-operated rats. This difference in tumor weight was not found in extrahepatic tumors. In uitro experiments did not show stimulation of cultured CC 531 cells by portal or systemic serum withdrawn 24 hours or 14 days after hepatectomy as compared with sera obtained after sham operation. Co-cultures of CC 531 cells and hepatocytes (in ratios of 1:10 or 1:l) demonstrated a higher 3H-thymidine incorporation than was the case in separately cultured cells. In co-cultures, bromodeoxyuridine (BrdU) incorporation in DNA was found primarily in CC 531 cells and rarely in hepatocytes. Cell density appeared to be of influence on 3H-thymidine incorporation in co-cultures. Hepatocytes were found to have a stimulating effect on CC 531 cells in low-density cultures, whereas high-density cultures exhibited an inhibiting effect after a culture time of 120 hours. These results show that, depending on cell density in co-cultures, a paracrine stimulating influence of hepatocytes on this type of colon carcinoma cells (CC 531) might be responsible for the increased tumor growth in uiuo. P PA TO LOGY 1995;22:1263-1272.)Abbreviations: PH, partial hepatectomy; FCS, fetal calf serum; EGF, epidermal growth factor; TGF, transforming growth factor; IGF, insulinlike growth factor; HGF, hepatocyte growth factor.

The median age was 54 years (range 2-85 years), with a 3:2 female to male ratio. The median size of the tumours was 4.1 cm (range 2-12 cm) and metastases occurred in seven of the 25 cases. If any form of adjuvant therapy is used it is usually radiotherapy. Chemotherapy seems to be reserved for cases where metastasis occurs. Average survival was 4 years (range 1 month to 17 years). Currently the best treatment seems to be wide excision of the tumour, with selective vascular reconstruction combined with adjuvant radiotherapy.

Tumour-bearing rats were randomized to a 70% partial hepatectomy or a sham operation. At days 1, 3 or 14, portal and systemic serum was obtained and colon carcinoma cells were cultured in the presence of 5, 10, 20 or 50% serum. Proliferation and epidermal growth factor receptor (EGFr) expression was measured in tumour cells. Proliferation was 25–40% higher in tumour cells cultured with portal serum after hepatectomy than after sham operation when using serum obtained at day 3, but not days 1 and 14 after operation. In cultures with serum obtained at day 14 after operation CC 531 cells showed a 30% higher proliferation rate with systemic hepatectomy serum than CC 531 cells with sham systemic serum. These effects were not mediated by a change in EGFr mRNA and protein levels as the used colon carcinoma cells did not reveal EGFr activity by any of the three detection methods used.

We reported a case of 27-year-old woman who suffered a hydrothorax induced by a central venous catheter that had been placed to facilitate parenteral nutrition. The central venous catheter was inserted into the superior vena cava through the right subclavian vein. Chest radiograph after insertion revealed proper position of the tip. After a few days, the patient developed acute cellulitis of the right breast, and intravenous antibiotics were started. Four days later, 10 days after the insertion of the catheter, the patient suddenly developed dyspnea and tachycardia. Computed tomography scan of the chest showed massive pleural effusion in the right thorax and a mediastinal shift; the tip of the catheter had perforated the superior vena cava and was located in the right pleural space. Thoracic and subcutaneous drainage showed a fluid similar to parenteral nutrition. The continuous mechanical force of the catheter tip against the superior vena cava wall in combination with a hyperosmolar solution was considered to be the cause of the acute cellulitis and a delayed hydrothorax.