Review Article | Open Access
N. Kadi, M. Isherwood, M. Al-Akraa, S. Williams, "Port-Site Metastasis after Laparoscopic Surgery for Urological Malignancy: Forgotten or Missed", Advances in Urology, vol. 2012, Article ID 609531, 5 pages, 2012. https://doi.org/10.1155/2012/609531
Port-Site Metastasis after Laparoscopic Surgery for Urological Malignancy: Forgotten or Missed
Purpose. Port-site metastasis has been a concern with the common use of laparoscopy in urologic oncology. We conducted this study to provide a review of port-site metastases reported after the laparoscopy in managing urologic malignancies, possible contributing factors and preventative measures. Materials and Methods. An electronic search of MEDLINE using the combined MESH key words “port-site metastasis” and “Urology”. Results. 51 articles addressing port-site metastasis after laparoscopic surgery for urolo¬gical malignancy were identified. Conclusion. Port-site metastasis after laparoscopic surgery for urolo¬gical malignancy is rare. The incidence is comparable to the rate for surgical wound metastases.
In recent years, with the widespread use of laparoscopy to treat an ever-increasing number of urologic malignancies, questions have been raised about the oncologic safety of this surgical approach . Currently, a large number of specialized centres around the world perform laparoscopy for urologic cancer [2, 3]. Nevertheless, local recurrence and port-site metastasis remain a concern .
Port-site metastases, though rare, have been extensively documented for other gynaecological and GI malignancies. When they occur, they often do so in the presence of advanced disease, but it is not uncommon for them to occur in isolation [5, 6]. Concern has been expressed that laparoscopic surgery might adversely affect the long-term outcomes by increasing the risk of port-site and peritoneal seeding.
The first known report of a port-site metastasis was by Dobronte and associates  in 1978. The authors reported implantation of malignant ovarian cystic adenoma in penetration sites of the pneumo-needle and trocar. Some specific procedures and tumors have been associated with a higher incidence of portsite metastasis or tumor seeding; however, the precise incidence of port-site metastasis and its aetiology and pathogenesis have not been well defined in urologic laparoscopy .
Port-site metastases is a multifactorial phenomenon with an as-yet undetermined incidence. Etiological factors include natural malignant disease behavior , host immune status , local wound factors , laparoscopy-related factors such as aerosolization of tumor cells (the use of gas, type of gas, insufflation and desufflation, and pneumoperitoneum) , and sufficient technical experience of the surgeons and operating team  (adequate laparoscopic equipment, skill, minimal handling of the tumor, surgical manipulation and wound contamination during instruments change, organ morcellation, and specimen removal) .
2. Materials and Methods
An electronic search of MEDLINE of the published literature up to 2010 was carried out using the combined MESH key words “port-site metastasis” and “Urology.”
Duplicate references, as well as repeated references to the same data sets, were removed. The articles and case reports directly addressing port-site metastasis after laparoscopic surgery for urological malignancy were reviewed. Articles were selected and categorized by topic into incidence, aetiology, pathophysiology, and possible preventative measures.
Table 1 showed the case reports found on MEDLINE search of the published literature up to 2010 recovered 51 for the MESH words “port-site metastasis” and “Urology.”
|Pca = prostate cancer, RCC = Renal cell carcinoma, SCC cell carcinoma, NA = not available.|
Etiological factor has been categorised in three main categories: tumour related, wound related, and surgical technique related. Surgical technique related factors have been categorised in two main categories: manipulation is the principal factor acting in tumour dissemination. Extraction of the surgical specimen is determined by the surgeon. The possible preventive measure has been categorised in two main categories: active measures and measures for reducing the risk of laparoscopic port-site metastasis in urological surgery.
Laparoscopic surgery is rapidly gaining widespread acceptance among urologists, including extensive application in malignant conditions . The incidence of tumour seeding in general laparoscopic surgery ranges from 0.8% to 21% (8, 9). However, most authors report an incidence of 0.5%, comparable to the rate for surgical wound metastases (0.8%–1.6%) in conventional open methods [9–11]. In recent years, several reports of port-site metastasis and tumor seeding have been published. Tsivian and Sidi  alone reported nine cases of port-site metastases after urologic laparoscopy, and Rassweiler and colleagues  published eight local recurrences observed in 1098 laparoscopic procedures for urologic malignancies. Recently, in an international survey of 19 urologic laparoscopic centres performing a total of 18,750 laparoscopic procedures for urologic malignancies, tumour seeding was reported in 13 cases (0.1%) .
Various theories tried to explain metastasis development at laparoscopic port site . Factors can be divided into three categories: tumor related, wound related, and surgical technique related .
Tumor-related factors [8–10]: biological aggressiveness of the tumor, represented by grade and stage, could play a decisive role in possible tumor seeding determination, explaining why grade 2 and 3 transitional cell carcinomas represent the majority of port-site metastases in urological procedures [8–10].
Wound-related factors [11–17]: local and systemic immune response to the pneumoperitoneum has been suggested. Its physiopathological mechanism has yet to be completely defined. There is a tendency towards systemic preservation of the immune system and towards immune depression of the peritoneum during laparoscopic insufflation demonstrated by macrophage function alteration [11–17].
However, it is logical to assume that morcellation of the specimen increases tumor seeding [5, 6, 15]. The direct dissemination of tumor cells from contaminated material or from extraction with an unclosed bag is well documented [5, 6, 15]. The observance of a large number of tumor cells at excessively manipulated ports supports this hypothesis as well as observance of greater number of malignant cells at port sites used by the surgeon compared with those used by assistants [5, 6, 15].
Port-site recurrence of tumour is a particular, and increasingly recognized [9, 31–37], drawback. certain measures have been suggested to prevent urologic port-site metastasis [9, 31–37], including (1) sufficient technical preparation, (2) avoidance of laparoscopic surgery if ascites ispresent [9, 31–37], (3) trocar fixation with avoidance of gas leakage along the trocar, (4) avoidance of tumor-boundary violation [9, 31–37], (5) cautious consideration of morcellation, (6) use of an impermeable bag if morcellation is done [9, 31–37], (7) use of a bag for intact specimen removal, (8) drainage placement if needed before abdominal deflation [9, 31–37], (9) povidone-iodine irrigation of the laparoscopic instruments, trocar, and port-site wounds [9, 31–37], and (10) suturing 10 mm trocar wounds [9, 31–37]. Povidone-iodine irrigation has been questioned, and peritoneal irritation secondary to this agent must not be underestimated [9, 31–37]. Regarding suggestion 10, Burns and coworkers  demonstrated on an animal model that portsite tumor implantation was significantly increased when only skin was closed compared with closure of all three layers . The authors proved that closure technique may influence the rate of port-site tumor implantation . For hand-assisted laparoscopic surgery, Chen and collaborators  recommend using a watertight bag model, not enlarging the surgical wound if there is resistance when extracting the surgical specimen and changing gloves before wound closure in order to avoid contamination with malignant cells . Port-site metastasis in urological laparoscopic surgery is rare. Several factors have been associated with tumor seeding, but tumor grade and stage appear to have the greatest importance. Nevertheless, risk can be minimized by applying open surgery oncologic procedural norms [9, 18–30].
Port-site metastasis in urological laparoscopic surgery is rare. Multiple factors have been associated with tumour seeding, but tumour grade and stage appear to play a major role. Multiple methods have been described to reduce the risk of port-site metastasis. The incidence is comparable to the rate for surgical wound metastases.
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