Factors influencing survival after complete resection of pulmonary metastases from colorectal cancer

BACKGROUND

The aim of this retrospective study was to determine the efficacy of complete (R0) resection for pulmonary metastases of colorectal carcinoma, and to clarify prognostic factors for survival that could be used to identify patients likely to benefit most from pulmonary resection.

METHODS

Data on 113 patients who underwent R0 resection of pulmonary metastases from colorectal cancer were reviewed. Overall median follow-up was 49 (range 1-140) months. Clinical and pathological factors were reviewed, and prognostic factors influencing survival were identified.

RESULTS

The overall 5-year survival rate was 67.8 per cent. Multivariable Cox hazard regression analysis revealed that the prethoracotomy serum carcinoembryonic antigen (CEA) level and lymphatic invasion by pulmonary tumour correlated significantly with survival. The 5- and 7-year survival rates of patients with a prethoracotomy CEA level below 5 ng/ml and no lymphatic invasion by pulmonary tumour were 94 and 79 per cent respectively. Pathological features of the primary colorectal cancer, previous hepatectomy for liver metastasis and repeated thoracotomy had no impact on survival.

CONCLUSION

Long-term survival can be expected after R0 resection of pulmonary metastases from colorectal cancer, particularly in patients with a prethoracotomy CEA level below 5 ng/ml and no lymphatic invasion by pulmonary tumour.

Prognostic factors in resection of pulmonary metastasis from colorectal cancer

Background

The aim of this retrospective study was to evaluate characteristics of primary colorectal cancer and pulmonary metastases in order to identify prognostic factors for overall survival and risk factors for further intrapulmonary recurrence after resection of pulmonary metastases from colorectal cancer.

Methods

Forty-nine patients who underwent resection of pulmonary metastases from colorectal cancer were reviewed. The factors assessed were age, sex, pathological findings of the original colorectal cancer (depth, lymphatic invasion, venous invasion, lymph node metastasis, differentiation, Dukes' stage) and pulmonary metastasis (maximum tumour size, number of tumours, completeness of resection), serum carcinoembryonic antigen level, previous hepatectomy for liver metastases, and surgical procedure for resection of pulmonary metastasis. Overall survival and intrapulmonary recurrence were also reviewed.

Results

Survival rates after resection of pulmonary metastases were 78 per cent at 3 years and 56 per cent at 5 years. Solitary pulmonary metastases were significantly correlated with survival (P = 0·049). The pathological features of the primary colorectal cancer had no impact on survival. Histologically incomplete resection of pulmonary metastasis significantly correlated with pulmonary re-recurrence (P = 0·034).

Conclusion

Long-term survival can be expected after complete resection of pulmonary metastases arising from colorectal cancer, especially in patients with a solitary pulmonary metastasis.

A new endoscopic tattooing technique for identifying the location of colonic lesions during laparoscopic surgery: a comparison with the conventional technique

BACKGROUND AND STUDY AIMS

Knowledge of the exact location of colorectal lesions is necessary but difficult to establish during surgery. Thus, endoscopic tattooing has been used as an important preoperative marker for identification. Using the conventional technique, we injected tattooing agents directly into the colonic wall. However, to make sure that the tattooing agents were adequately injected into the submucosal layer, and to prevent spillage into the peritoneal cavity, we modified the conventional method and developed a new tattooing technique: using India ink with prior and subsequent injection of saline into the submucosa. The aim of this study was to retrospectively assess the clinical utility and potential complications of the above two techniques of endoscopic tattooing using India ink.

PATIENTS AND METHODS

A total of 153 patients underwent laparoscopically assisted colectomy at the National Cancer Center Hospital East, Kashiwa, Chiba, Japan, between June 1994 and December 1999, and 91 patients underwent preoperative endoscopic tattooing by either the conventional or the new technique. The conventional and new techniques were used from June 1994 to December 1997 (n = 36) and from January 1998 to December 1999 (n = 55), respectively. Informed consent was obtained from all the patients.

RESULTS

Using the conventional technique, the exact location of the lesion was identified in 31 of 36 cases (86.1 %) during surgery. The complications of this procedure were silent local peritonitis in two patients and reactive lymph node swelling in one patient (3/36, 8.3 %). Using the new technique, in 54 of 55 cases lesions (98 %) were easily identified (p = 0.034),and in only one there was a small leakage of India ink into the peritoneal cavity (1/55; 1.8 %), no other serious complications were observed.

CONCLUSIONS

The results demonstrate that our new technique for endoscopic tattooing is probably better than the conventional technique for clinical use, in terms of diagnostic accuracy and safety, but this would have to be proven in a randomized comparison.

Preliminary results of pelvic autonomic nerve-preserving surgery combined with intraoperative and postoperative radiation therapy for patients with low rectal cancer

BACKGROUND

In Japan, lateral lymphadenectomy was widely performed for patients with stage II-III rectal tumors because it was thought to contribute to good local control, but the pelvic autonomic nerves were thus sacrificed. Although autonomic nerve-sparing surgery with lateral lymph node dissection has been tried from around 1987, the type of nerve sparing varied and the indications were not established. To examine the possibility of expanding the indications for total pelvic autonomic nerve preservation for patients with low rectal cancer, we conducted a pilot study.

METHODS

Between 1993 and 1997, a total of 50 patients with low rectal cancer underwent pelvic autonomic nerve preservation with lateral lymphadenectomy of both sides and intraoperative radiation therapy followed by postoperative radiation therapy.

RESULTS

The median follow-up period for surviving patients was 41 months. The 3-year local control rates for all patients, with stage I-II and stage III tumors were 88% (95% confidence interval, 78-97%), 97% (90-100%) and 73% (52-94%), respectively. The site of local recurrences was not near or within the preserved plexus.

CONCLUSIONS

The preliminary results showed good local control rate for patients with stage I-II tumors. For patients with stage III tumors, the local control rate was unsatisfactory, but nerve sparing was not the cause of local recurrence. Further investigation of function-preserving surgery without decreasing curability is needed.

Three-dimensional organization of lymphatics in the dog stomach: a scanning electron microscopic study of corrosion casts

The three-dimensional organization of the lymphatics in the dog stomach was studied by scanning electron microscopy of corrosion casts, which were made by direct parenchymal injection of low-viscosity Mercox-resin into the mucosa and the muscular layers. Although the organization of lymphatics in the stomach has been studied by a variety of methods, the origin of the lymphatics and their connection in each layer has not been clearly defined. In this study, using dog stomach because of its structural similarity to the human stomach, we defined the lymphatic structure in all gastric layers, with lymphatics absent in the upper two-thirds of the lamina propria mucosae. They were first encountered at the deepest level of the lamina propria, immediately above the lamina muscularis mucosae. These lymphatics were composed of single-layered irregular meshes. Slender lymphatics arising from this network passed through the lamina muscular is mucosae and drained into the lymphatic plexus, which was composed of thicker lymphatics at the uppermost layer of the submucosa. Lymphatic valves were frequently seen in this plexus. From this plexus, slender connecting lymphatics with valves extended straight downward without lateral communications and drained into the lymphatic plexus at the deepest layer of the submucosa. This latter plexus, composed of large-caliber lymphatics, issued flattened lymphatics which formed a three-dimensional network in the muscular layer. The subserosal lymphatics were composed of thick lymphatics with tortuous courses and drained into the efferent lymphatics.

A new method for palliation of malignant obstructive jaundice utilizing a peritoneo-venous shunt pump

A new simple palliative method for use in malignant obstructive jaundice is presented. This method is particularly effective in the prevention of ascending infections. The method consists of interposing a one-way flow shunt pump (peritoneo-venous shunt pump) between a bile catheter and a jejunal catheter. Four patients were treated with this new method. Jaundice improved significantly in all patients. They had a much better quality of life with no serious complications during the terminal course. This less invasive and safe procedure is preferred for patients who have extrahepatic biliary obstruction due to incurable malignant tumors.