Primary Gallbladder Cancer Discovered Postoperatively after Elective and Emergency Cholecystectomy

Summary

Background:
Gallbladder cancer is a rare neoplasm associated with high mortality and poor prognosis. It is usually correlated with cholelithiasis and presents more commonly in elderly and female patients. Diagnosis is seldom made preoperatively because of the indolent progression of the tumor.

Methods:
The hospitalization and surgical records of our surgical department were examined from January 1992 to December 2001, searching for patients who had undergone cholecystectomy. Additionally, the histopathological diagnoses of the same period were studied searching for patients with the diagnosis of gallbladder cancer established post­operatively and not intraoperatively by frozen section.

Results:
In the period of 1992– 2001, a total of 1,536 cholecystectomies took place and 14 cases of gallbladder cancer were diagnosed postoperatively. The ratio of men to women is 3/ 11 with a mean age of 69.4 years. The clinical symptoms were non‑specific and mortality was 57%.

Conclusion:
In most cases gallbladder cancer is diagnosed after cholecystectomy and even in these cases it can be in an advanced stage and the prognosis of this rare neoplasm is poor.

Key words:
gallbladder –  cancer –  carcinoma –  cholecystectomy

Introduction

Gallbladder cancer (GC), first described in 1777 by Stroll [1– 5], is a relatively rare neoplasm; it is the fifth most common malignancy of the gastrointestinal tract and has been considered to be a highly lethal disease [2– 4,6– 9]. It is most common among the elderly, especially in the 7th and 8th decade of life [7]. Frequency of GC at cholecystectomy increases along with age. Below the age of 50, the frequency of GC is about 0.25%, between ages 50– 64 it is about 3.1%, increasing to 9.1% at ages 65– 74 and to 11.9% over age 75 [10]. The ratio of men to women is 1/ 3 or 1/ 4 [1– 9,11]. GC presents a variable geographic distribution and both genetic and environmental risk factors seem to contribute in the development of GC [1– 9].

Purpose

The purpose of this study is to present our experience in postoperatively discovered incidental gallbladder cancer in the period of 1992– 2001.

Methods and Material

For the present retrospective study, the hospitalization, surgical and histopathological records of our department were examined from January 1992 to December 2001, searching for patients who had undergone cholecystectomy. Furthermore, the histopathological diagnoses of the same period were studied searching for patients with gallbladder cancer.

Results

During this 10‑year period a total of 1,536 cholecystectomies took place. Fourteen cases of primary gallbladder cancer were found postoperatively. The ratio of women to men was 11/ 3 and the ages ranged from 59 to 87 years with a mean age of 69.4 years.

The clinical signs were: acute cholecystitis (5/ 14, 35.7%), right upper quadrant pain (6/ 14, 42.86%), obstructive jaundice (1/ 14, 7.14%), a combination of right upper quadrant pain and jaundice (7.14%) and one patient was asymp­tomatic (7.14%). One case (7.14%) of porcelain gallbladder was found preoperatively.

The treatment included open cholecystectomy (11/ 14, 78.6%) and laparoscopic cholecystectomy (3/ 14, 21.4%). Also, a Kehr tube was inserted into two patients. In all but two cases, gallstones (85.7%) were present and in 4/ 14 patients (28.57%) gallbladder empyema was found intraoperatively.

The diagnosis was accomplished postoperatively by histopathological examination. All cases of GCs were adenocarcinomas. The staging of the patients is presented in Tab. 1.

Patients of T2 stage and T3 stage were referred to a hepatobiliary surgery department for further treatment and all patients were further referred to the oncological department after the surgical intervention (data not included) but with poor results. The mortality rate was 57% (8/ 14 patients).

Discussion

There are many risk factors including genetic and environmental that are related to gallbladder carcinogenesis [12– 15]. Females are affected by GC more commonly than males and the majority of patients are over 40 years old [14,16]. A correlation between GC and multiple familial polyposis/ Gardner syndrome, Peutz– Jeghers syndrome, porcelain gallbladder and anomalous pancreato-biliary ductal union has also been reported. A progression from adenoma to carcinoma has been demonstrated within adenomatous polyps of the gallbladder [17]. However, the majority of gallbladder polyps are benign cholesterol polyps [16]. Chronic infection by Salmonella may also be an important causative factor in the pathogenesis of gallbladder cancer [14,16]. The prevalence of GC is increased among workers in the oil, paper, chemical, shoe, textile, and cellulose acetate fibre manufacturing industries suggesting occupational exposure to carcinogens [14]. All the above factors are debatable and do not explain the full picture. The correlation of GC with cholelithiasis is well established [18]. Geographical variability of gallbladder cancer incidence cor­related with the prevalence of gall­stones is reported [14]. High incidence rate is found among Chileans, Bolivians, North American Indians, Mexican- Americans and Central Europeans [14] all of whom also have high prevalence of cholelithiasis. On the other hand, African Americans present the lowest incidence rate. The estimated incidence in the United States is 1 : 100,000 for men and 2 : 100,000 for women, corresponding to 5,000 new cases each year [13]. Gallstones are present in 74– 92% of patients with gallbladder cancer. In a cohort study conducted in the United States, the relative risk of developing gallbladder cancer in patients with gallstone disease was 8.3 compared to the general population [19]. Relative risk ranges widely from 2.3 to 34.4 between different studies [20]. However, the minority of patients (less than one percent) with cholelithiasis develops gallbladder cancer and approximately 20% of gallbladder cancer patients show no evidence of previous cholelithiasis [14]. The coexistence of gallstones in GC indicates at least a role of a co-factor but the existence of multiple factors that lead to GC is more possible. There are plentiful studies about the correlation between gallstones and gallbladder cancer [6,15,21,22]. Long duration of gallstones, more stones, larger and heavier, infection, and type of stone is believed to lead to dysplastic and eventually malignant changes in the gallbladder mucosa.

GC is usually found incidentally and approximately 1% of patients who undergo cholecystectomy for cholecystitis have an unsuspected gallbladder cancer [10]. Premalignant changes, including epithelial hyperplasia, dysplasia and carcinoma, have been identified in 13.5, 8.3 and 3.5%, respectively, of patients undergoing cholecystectomy for cholelithiasis or cholecystitis [23]. More than 90% of GC is well, to moderately differentiated adenocarcinomas. In our study all the cases were adenocarcinomas. Less common types include papillary, muqinous, squamous and adenosquamous [16]. Malignancy is usually diagnosed on pathological examination after simple cholecystectomy [6,14]. More GC arises in the fundus of the gallbladder (60%), but GCmay also occur in the body (30%) and in the neck (10%) [4,24].

GC can be diagnosed: 1) preoperatively when malignancy is suspected, 2) at the time of cholecystectomy for presumed benign disease, or 3) incidentally on pathological examination after simple cholecystectomy. The last scenario is more common as the diagnosis is rarely accomplished preoperatively because of indolent progression of this type of tumor [2,4– 7,12,14,25– 28]. Patients with early stage gallbladder cancer are often asymptomatic and GC is diagnosed during routine cholecystectomy. The symptoms –  nonspecific for gallbladder cancer –  include pain in the right upper abdomen (73%), nausea and vomiting (43%), jaundice (37%), weight loss and anorexia (35%), flatulence, prickliness, hematemesis and melaena [4,10]. Patients with early stage gallbladder cancer are often asymptomatic. Jaundice is a bad prognostic sign pointing to cancer and is present in 45% of patients, one in five shows ascites and one in ten an obstruction of the duodenum on clinical presentation [29,30]. Increased levels of liver enzymes are also common. Seventy- five percent of patients are diagnosed when the disease is at advanced stages, beyond the limits of resection. It would be helpful to inspect the gallbladder mucosa after simple cholecystectomy. When malignancy is suspected lesions should be sent for frozen section histology.

It is certain that advances in preoperative imaging have occurred in the last years. Ultrasonography is usually the initial examination required, often when benign gallbladder disease is suspected. Gallbladder cancer may be presented as 1) a mass replacing the gallbladder or invading the gallbladder bed, 2) an intraluminal gallbladder growth or polyp, or 3) asymmetric gallbladder wall thickening. In cases of locally advanced disease, ultrasound has a sensitivity of 85% and an overall accuracy of 80% in diagnosing gallbladder cancer [30]. However, in an earlier stage disease, especially when the tumor or cancerous polyp is flat or sessile and is associated with cholelithiasis, ultrasonography may fail to detect the lesion [31]. Ultrasonographic examination is also helpful in staging the disease by showing the involvement of the biliary tract and the hepatic arterial or portal venous invasion. CT or MRI is also useful in staging the disease. It has been demonstrated that conventional MRI with associated MRA and MRCP can detect the presence of vascular invasion, biliary tract involvement, liver invasion and lymph node involvement [16]. 18F- fluorodeoxyglucose (FDG) positron emission tomography (PET) may also be useful in the preoperative evaluation of gallbladder cancer [32]. In one study, it has been reported that FDG- PET changed the management of nearly 25% of patients [33]. A sensitivity of 78% and a specificity of 80% for FDG- PET detecting residual primary disease and a sensitivity of 50% in detecting distant metastases or carcinomatosis have also been reported [16]. There is a relatively high risk of metastatic disease; two‑thirds of patients with T3 lesions and over 80% of patients with T4 lesions have peritoneal spread [9,17]. The detection of peritoneal and small liver metastases is still difficult with standard imaging techniques. Staging laparoscopy was reported to be useful in detecting peritoneal and/ or hepatic metastatic disease not identified on preoperative imaging [34].

The majority of the patients with GC are diagnosed at advanced stages and the prognosis is generally extremely poor [8]. The median survival for incidental carcinomas is 26.5 months and for suspected carcinomas is 9.2 months [2,7,26]. Important for the prognosis is the clinical or pathologic stage. The most commonly used is the TNM staging system [14,16,35]. In patients with GC stage III and IV, the 5‑year survival rate was 52% after curative resection compared with the 5% 5‑year survival rate after a non‑curative resection [35]. The peritoneum and the liver are most commonly the sites of distant metastasis. The prognosis is better when the tumors are well‑differentiated [10]. As determined by different studies, if negative margins were seen, patients achieved a 5‑year survival rate as follows: stage I (90– 60%), stage II (56– 80%), stage III (15– 40%) and stage IV (5– 10%) [7,36,37].

GC is a significant challenge for laparoscopic surgery [2,38]. Survival is associated with the ability to achieve a complete tumor extirpation with negative histologic margins, a curative R0 resection [9,10,16,22,39,40]. Treatment is usually adjusted according to the staging: – Tis and T1a GC disease requires simple cholecystectomy (the reported 5‑year survival rate is 85%) [16,22]. For – T1b GC that invades the muscular layer of the gallbladder, controversial suggestions support either the simple cholecystectomy or radical resection [41– 43]. T1b tumors may also require a lymphadenectomy or liver resection [16,22,40]. – T2 disease, which presents an incidence rate of lymph node metastasis that reaches 46%, with most of the patients developing residual peritoneal seedings or disease in the lymph nodes after simple cholecystectomy, requires radical resection, as well, including en bloc resection of the adjacent liver and regional lymphadenectomy. Similarly, resection and reconstruction of the bile duct may be necessary. In T3 disease, which invades adjacent organs, such as extrahepatic bile ducts, liver, duodenum, pancreas, colon and stomach, it is suggested that simple cholecystectomy is inadequate and residual disease could lead to recurrence or death within 3 years [44]. T3 tumors require liver resection, regional lymphadenectomy, bile duct resection, en bloc resection of adherent tissues and adjacent organs. In T4 disease, which includes invasion of the main portal vein or he­patic artery or invasion of at least two extrahepatic organs or structures, complete surgical resection of bulky local disease is reported to increase the 5‑year survival rate, while simple cholecystectomy for T3 and T4 disease showed absence of possibilities for 5‑year survival [2,8,9,42,45,46]. In advanced stages, in which survival is ascertained to be associated with the extent of resection, palliative treatment is proposed to relieve the pain, jaundice, cholangitis, bowel and gastric outlet obstruction for improvement of the quality of life [2]. T4 tumors are most of the times unresectable. In these cases palliative therapies may be helpful. It is reported that there is no consensus among surgeons as to justify whether reoperation or radical resection should be preferred at any case. Aggressive resection is reasonable, except for those patients with lymph node involvement outside the hepatoduodenal ligament and metastases. However, curative resection continues to be the only hope for survival in patients suffering from this lethal disease.

The role of chemotherapy in the treatment of GC must be further examined. For patients who present with unresectable tumors or recurrence after resection survival rates range between 2 and 4 months and palliation may be helpful to relieve symptoms [16]. Surgical bypass or endoscopically or radiologically placed drainage tubes might be necessary to relieve symptoms related to biliary obstruction [47]. Intestinal bypass should be performed if there is a small bowel obstruction. However, it should be considered that morbidity from surgical bypass is high. Adjuvant chemotherapy with 5- FU and mitomycin to resected gallbladder patients might have promising results [16]. Current studies in gallbladder and biliary tract cancers are focusing on gemcitabine‑based chemotherapy or chemoradiotherapy. How­ever, in general, palliative chemotherapy has yielded poor results as far as the treatment of unresectable gallbladder cancer is concerned. Several studies suggested a small improvement with radiation therapy either alone or in combination with systemic chemotherapy. Todoroki et al [48] reported an overall 5‑year survival rate of 9.1% following aggressive resection surgery for stage IV gallbladder carcinoma and adjuvant radiotherapy.

As far as prevention is concerned, primary prevention of gallbladder cancer is rather unlikely in the near future. Secondary prevention is directed to the treatment of symptomatic gallstones, especially in endemic areas where cholelithiasis is highly prevalent [14]. Prophylactic laparoscopic cholecystectomy might be cost effective and its role should be further examined [15].

The authors declare they have no potential conflicts of interest concerning drugs, products, or services used in the study.

The Editorial Board declares that the manuscript met the ICMJE “uniform requirements” for biomedical papers.

Orestis Ioannidis, MD

Alexandrou Mihailidi 13

546 40 Thessaloniki

Greece

e-mail: telonakos@hotmail.com

Submitted: 13. 11. 2012

Accepted: 26. 11. 2012