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Research ArticleClinical Studies

The ABO Blood Group Impacts the Survival of Patients Undergoing Pancreatoduodenectomy for Biliary Tract Cancer

SHOZO MORI, TAKU AOKI, KAZUMA TAGO, TAKAYUKI SHIMIZU, NOBUHIRO HARADA, KYUNG-HWA PARK, YUHKI SAKURAOKA, TAKAYUKI SHIRAKI, YUKIHIRO ISO and KEIICHI KUBOTA
In Vivo July 2020, 34 (4) 1893-1900; DOI: https://doi.org/10.21873/invivo.11985
SHOZO MORI
Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan
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  • For correspondence: s-mori@dokkyomed.ac.jp
TAKU AOKI
Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan
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KAZUMA TAGO
Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan
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TAKAYUKI SHIMIZU
Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan
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NOBUHIRO HARADA
Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan
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KYUNG-HWA PARK
Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan
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YUHKI SAKURAOKA
Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan
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TAKAYUKI SHIRAKI
Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan
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YUKIHIRO ISO
Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan
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KEIICHI KUBOTA
Department of Gastroenterological Surgery, Dokkyo Medical University, Tochigi, Japan
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Abstract

Background/Aim: Although ABO blood group has been reported to be associated with the outcome of patients with pancreatic cancer, little is known about its impact on patients with biliary tract cancer (BTC). We evaluated the prognostic relevance of ABO blood group in patients who had undergone resection of BTC. Patients and Methods: A total of 154 patients with BTC undergoing pancreatoduodenectomy were retrospectively reviewed. Associations between ABO blood group and patient survival were evaluated by univariate and multivariate analysis. Results: The 5-year overall survival rate was higher in group O patients (n=46) than in other blood group patients (n=108) (65.8% vs. 47%, p=0.005). Multivariate analysis revealed that a non-O blood group was an independent risk factor for poor survival (p=0.021). Conclusion: ABO blood group is associated with the prognosis of patients with resected BTC; group O patients have a better outcome.

  • ABO blood group
  • biliary tract cancer
  • pancreatoduodenectomy
  • prognosis

The ABO blood group antigens are the most important alloantigens among the human blood group systems, being expressed not only on red blood cell membranes but also on the surfaces of several other cell types and tissues (1-3). The association between ABO blood group and cancer has been studied by a number of investigators since the mid-1900s (4-7); and several plausible mechanisms have been proposed to explain this association, including inflammation, immune response, intercellular adhesion, and cellular membrane signaling (3, 8-10). In fact, the influence of ABO blood group has been reported in various types of malignancy, including cancers of the gastrointestinal tract, urinary tract, respiratory tract, and breast (3, 6). In the pancreato-biliary field, a lower incidence of pancreatic cancer in blood group O individuals was revealed in a two-stage genome-wide association study (GWAS) (11). Some studies have also suggested that blood group O confers a more favorable prognosis than non-O blood groups in patients with pancreatic cancer (12, 13). With regard to biliary tract cancer (BTC), it remains unclear if ABO blood group impacts the clinical outcome. Because BTC is a relatively rare malignancy (14-16), the relationship between blood groups and outcome might be difficult to assess because of the small number of cases. Therefore, the aim of this study was to investigate the associations between the ABO blood groups and outcomes of patients with BTC who had undergone pancreatoduodenectomy (PD), and whether blood group O is associated with a favorable prognosis.

Patients and Methods

A total of 161 consecutive patients with BTC underwent PD with curative intent at the Department of Gastroenterological Surgery, Dokkyo Medical University Hospital, between June 2000 and May 2017. Four patients who died of postoperative complications in the hospital and 3 patients with distant metastases affecting the liver and para-aortic lymph nodes at the time of surgery were excluded, because the aim of this study was to evaluate the long-term outcome. Finally, 154 patients were retrospectively reviewed. This study was approved by the ethics committee of Dokkyo Medical University (R-13-9J).

Distal cholangiocarcinoma (DCC) was defined as cholangiocarcinoma with an epicenter located in the common bile duct below the confluence of the cystic duct and above the ampulla of Vater (17). A carcinoma arising from the ampullary complex, distal to the confluence of the common bile and pancreatic duct, was defined as Ampulla of Vater cancer (AVC) (18).

Histopathological reviews of the resected specimens were performed by pathologists. The tumors were classified according to the Sixth Edition of the Japanese Rules for Cancer of the Biliary Tract and the Seventh Edition of the AJCC Staging Manual (17, 19).

Conventional PD or subtotal stomach-preserving PD with regional lymph node dissection were routinely performed (20, 21). Postoperative complications were classified according to the Clavien-Dindo classification (22). Patients with Grade III or IV complications were included in the complication group. No patients received neoadjuvant chemotherapy. Adjuvant chemotherapy was used according to each patient's decision after his/her informed consent, since no adjuvant chemotherapy has yet been established for BTC in Japan (23-25).

After surgery, the patients visited the hospital once a month for the initial 12 months and at 2- to 3-month intervals after surgery. Tumor markers, including carcinoembryonic antigen (CEA) and carbohydrate antigen 19-9 (CA19-9) were examined at each visit. Patients were monitored by contrast-enhanced computed tomography of the chest and abdomen at 3-month intervals for the initial 12 months and at 4-month intervals thereafter.

SPSS version 25.0 (IBM Japan, Tokyo, Japan) was used for all statistical analyses. The χ2 test was used for categorical data. Survival curves were created by the Kaplan-Meier method and compared by the log-rank test. The median follow-up period was calculated as the interval between the date of surgery and the date of last follow-up or death. The Cox proportional hazards model with forward stepwise selection was used for multivariate analysis. Differences with p<0.05 were considered statistically significant.

Results

A total of 154 patients with BTC who underwent pancreatoduodenectomy were eligible for analysis. Among them, 90 (58.4%) had DCC and 64 (41.6%) had AVC. There were 46 blood group O patients (29.9%) and 108 non-O patients (70.1%) [52 group A (33.8%), 48 B (31.2%), and 8 AB (5.1%)]. There were 93 men (60.4%) and 61 women (39.6%) with a median age of 70 years (range=35-85 years). The median follow-up period was 44 months (range=4-233 months) for the entire patient group. The median operative time and blood loss were 496 min (range=232-957 min) and 581 ml (range=76-3212 ml), respectively.

PD with portal vein resection to achieve curative resection was undertaken in 8 patients [group O (n=1) and non-O (n=7)]. Postoperative complications (Clavien-Dindo classification grade III or IV) were observed in 40 patients (26%). The median postoperative hospital stay was 37 days (range=10-168 days). The clinicopathological characteristics in relation to the ABO blood group are summarized in Table I. The differences between any of the variables were not significant, except for the pathological lymph node status in the blood group O and non-O patients. Differences between surgical variables such as operative time, blood loss, postoperative complications, and postoperative hospital stay for the blood group O and non-O patients were not significant [median 496 min vs. 492 min, p=0.825; median 568 ml vs. 581 ml, p=0.810; n=12 (26%) vs. n=28 (26%), p=0.983; and median 37 days vs. 38 days, p=0.417; respectively].

Differences between the proportions of patients with DCC and AVC making up blood group O and non-O patients [Group O: n=31 (67.4%) DCC and n=15 (32.6%) AVC vs. Non-O: n=59 (54.6%) DCC and n=49 (45.4%) AVC, p=0.141] were not significant. Adjuvant chemotherapy agents such as gemcitabine (n=38), gemcitabine plus cisplatin (n=18), S-1 (n=3) and others (n=5) were administered to 14, 3, 1, and 4 blood group O patients and to 24, 15, 2 and 1 non-O patients, respectively. There was no significant difference between the blood group O and non-O patients with regard to adjuvant chemotherapy agents (p=0.303).

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Table I.

Clinicopathological characteristics of patients stratified by ABO blood group.

Overall survival rate according to ABO blood group. The 5-year overall survival (OS) rates for the O, A, B and AB group patients were 65.8% (n=46), 40.3% (n=52), 56.9% (n=48), and 37.5% (n=8), respectively; [p=0.006 (O vs. A), p=0.061 (O vs. B), and p=0.013 (O vs. AB)] (Figure 1). The 5-year OS rates in the blood group O (n=46) and non-O (n=108) patients were 65.8% vs. 47%, respectively (p=0.005). The association between ABO blood group and patient survival was significant.

Figure 1.
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Figure 1.

Overall survival (OS) stratified by the ABO blood groups. The 5-year OS rates for the O, A, B and AB group patients were 65.8% (n=46), 40.3% (n=52), 56.9% (n=48), and 37.5% (n=8), respectively; [p=0.006 (O vs. A), p=0.061 (O vs. B), and p=0.013 (O vs. AB)].

Overall survival rate according to ABO blood group in patients with or without lymph node metastasis. In patients negative for lymph node metastasis, the 5-year OS rates for the O, A, B and AB group patients were 65.5% (n=36), 52.9% (n=28), 57.7% (n=29), and 60% (n=5), respectively; [p=0.339 (O vs. A), p=0.332 (O vs. B), and p=0.483 (O vs. AB)] (Figure 2A). The 5-year OS rates in blood group O (n=36) vs. non-O (n=62) patients were 65.5% vs. 55.3%, respectively (p=0.230). In patients positive for lymph node metastasis, the 5-year OS rates for the O, A, B and AB group patients were 66.7% (n=10), 25% (n=24), 55.8% (n=19), and 0% (n=3), respectively; [p=0.009 (O vs. A), p=0.111 (O vs. B), and p<0.001 (O vs. AB)] (Figure 2B). The 5-year OS rates in blood group O (n=10) vs. non-O (n=46) patients were 66.7% vs. 35.8%, respectively (p=0.016). The association between ABO blood group and patient survival in patients positive for lymph node metastasis was significant.

Risk factors for survival. Table II shows the results of the uni- and multivariate analysis of risk factors for OS. Seven of 10 factors were found to be significant by univariate analysis: non-O blood group, CEA>5 ng/ml, CA19-9>37 U/ml, histology (mod or por), pT3 or pT4, lymph node metastases (+), and resection margin (+). Multivariate analysis revealed that non-O blood group [hazard ratio (HR)=1.811; 95% confidence interval (CI)=1.093-3.001; p=0.021], CEA>5 ng/ml (HR=2.282; 95%CI=1.294-4.022; p=0.004), histopathology (mod or por) (HR=1.860; 95%CI=1.145-3.022; p=0.012), and resection margin (+) (HR=2.762; 95%CI=1.558-4.895; p=0.001) were independent risk factors for poor OS.

Discussion

This study clearly demonstrated a relationship between ABO blood group and the outcome of patients with BTC who had undergone PD. Patients with blood group O had the best 5-year OS rate, followed in order by blood groups B, A, and AB (Figure 1). In addition, having a non-O blood type was shown to be a risk factor for poor survival by multivariate analysis (Table II). These results are similar to those of previous studies reporting that blood group O patients with pancreatic cancer had a better prognosis than patients with other blood types in the ABO blood group (12, 13). To our knowledge, this is the first report of a study using Kaplan-Meier analysis with log-rank test and multivariate analysis to evaluate the impact of ABO blood group status on the outcome of patients with BTC.

Figure 2.
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Figure 2.

Overall survival (OS) stratified by the ABO blood groups in patients negative (A) or positive (B) for lymph node metastasis. (A) In patients negative for lymph node metastasis, the 5-year OS rates for the O, A, B and AB group patients were 65.5% (n=36), 52.9% (n=28), 57.7% (n=29), and 60% (n=5), respectively; [p=0.339 (O vs. A), p=0.332 (O vs. B), and p=0.483 (O vs. AB)]. The 5-year OS rates in blood group O (n=36) vs. non-O (n=62) patients were 65.5% vs. 55.3%, respectively; (p=0.230). (B) In patients positive for lymph node metastasis, the 5-year OS rates for the O, A, B and AB group patients were 66.7% (n=10), 25% (n=24), 55.8% (n=19), and 0% (n=3), respectively; [p=0.009 (O vs. A), p=0.111 (O vs. B), and p<0.001 (O vs. AB)].

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Table II.

Uni- and multivariate analyses of risk factors for survival of patients who underwent surgery for biliary tract cancer.

Several plausible mechanisms could account for the association between ABO blood group antigens and cancer development and progression (3, 8-10). Glycosyltransferase is encoded by the ABO gene located on chromosome 9q34. It catalyzes N-acetylgalactosamine or D-galactose to the common precursor, H antigen, which is eventually converted to the A or B antigen (3). The O variant encodes a nonfunctional glycosyltransferase (3). Changes in the enzymatic activity of ABO glycosyltransferase play an important role in the activation of adhesion molecules, intracellular signaling, and determination of the level of von Willebrand factor (VWF), thereby affecting tumor growth and spread (3, 8-10). VWF is a multimeric glycoprotein, which is synthesized in endothelial cells, and is one of several platelet adhesion ligands that could potentially modulate cancer development and metastasis (3, 8). The VWF antigen level in adults is, on average, about 25% to 30% lower in blood group O individuals than in non-O individuals (26, 27). Liu et al. (8) have reported that the level of VWF is significantly higher in lung cancer patients with distant metastasis than in those without distant metastasis and in healthy controls. Moreover, significantly increased plasma VWF levels have been observed in non-O individuals relative to O group individuals. In patients with glioblastoma, increased VWF levels are related to a three-fold higher risk of death and a reduced likelihood of 1-year survival (28). These results indicate that an increased VWF level might facilitate the invasiveness and metastasis of tumors.

ABO gene was recently reported to affect the circulating levels of adhesion molecules such as soluble intercellular adhesion molecule-1 (sICAM-1), E-selectin, and P-selectin, which participate in inflammatory conditions (3, 29, 30). Cancer and inflammation are known to be closely associated (10). Significantly decreased levels of sICAM-1 expression have been observed in non-O blood group patients (especially those with blood group A) compared with blood group O patients (9, 31, 32). Low levels of sICAM-1 might promote tumor spread and distant metastasis.

Several studies have reported an association between ABO blood group and the risk of pancreatic cancer (11, 33, 34). An association between a locus on 9q34 marked by the single nucleotide polymorphism (SNP) rs505922 and pancreatic cancer has been confirmed in a two-stage GWAS (11). Blood group O individuals were found to have a lower risk of pancreatic cancer than group A and B individuals. In the clinical setting, blood group O patients have been shown to have a better outcome than non-O patients (12, 13). Krawczyk et al. (35) investigated the relationship between the development of cholangiocarcinoma and the ABO variant rs505922 in 180 individuals with cholangiocarcinoma and 350 cholangiocarcinoma-free controls. They suggested that although the association between this SNP and cholangiocarcinoma did not reach significance in association tests and regression analysis, the presence of Hardy-Weinberg disequilibrium might be indicative of a possible association, especially in patients with intrahepatic cholangiocarcinoma. Additional studies of large cohorts that explore the differences in the potential risk of cholangiocarcinoma among individual blood groups might help to clarify the underlying mechanisms.

Phenotypic changes such as alterations in the expression of blood-group-related antigens are thought to be associated with tumor aggressiveness or prognosis in many malignancies (36, 37). In an immunohistochemical study, Minato et al. (38) investigated the expression of blood-group-related antigens in patients with cholangiocarcinoma, and the results suggested that both the expression and intracellular distribution of such antigens were related to the histological grade of the cholangiocarcinoma specimens. Alterations in the intracellular localization of these antigens might reflect the biological behavior of carcinoma cells. In the context of the prognosis of patients with cholangiocarcinoma, these findings are intriguing.

The relationship between Rhesus factor in blood group and oncological outcomes was not evaluated in this study, because an only patient was Rhesus-negative. D'Andrea et al. (39) reported that Rhesus factor was not associated with oncological outcomes for non-metastatic urothelial carcinoma of the bladder on multivariate analysis.

In patients negative for lymph node metastasis (n=98), the difference between the 5-year OS rates of blood group O and non-O patients was not significant (65.5% vs. 55.3%, p=0.230). However, in patients positive for lymph node metastasis (n=56), the 5-year OS rate of blood group O patients was significantly higher than that of the blood group non-O patients (66.7% vs. 35.8%, respectively; p=0.016). Although univariate analysis showed that adjuvant chemotherapy did not impact survival (p=0.888) (Table II), among patients receiving adjuvant chemotherapy (n=64), group O patients (n=22) obtained a better outcome than non-O patients (n=42) (5-year OS rate: 62% vs. 43.5%, p=0.030). These results suggest that stratification of patients by ABO blood group might be useful in future clinical studies designed to estimate the efficacy of adjuvant chemotherapy in patients who underwent resection of BTC.

Our study has limitations. This was a single-center retrospective study that analyzed data in a Japanese population only. In addition, the number of enrolled study patients was small. Therefore, additional prospective studies with larger numbers of patients are needed to confirm the association between ABO blood group and the outcome of patients with BTC. In addition, experimental studies are needed to clarify the underlying mechanisms involved in the impact of blood type on outcome.

In conclusion, our results suggest a significant association between ABO blood group and the survival of patients with BTC who have undergone PD. Patients with blood type O are more likely to have better survival than patients with a non-O blood type.

Footnotes

  • Authors' Contributions

    Study concept and design: S.M.; Drafting of the manuscript: S.M.; Data collection: K.T., T.S., N.H., K.P., Y.S., T.S., and Y.I.; Critical revision of the manuscript: T.A.; Study supervision: K.K.

  • This article is freely accessible online.

  • Conflicts of Interest

    The Authors have no conflicts of interest to declare regarding this study.

  • Received February 15, 2020.
  • Revision received March 30, 2020.
  • Accepted March 31, 2020.
  • Copyright© 2020, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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The ABO Blood Group Impacts the Survival of Patients Undergoing Pancreatoduodenectomy for Biliary Tract Cancer
SHOZO MORI, TAKU AOKI, KAZUMA TAGO, TAKAYUKI SHIMIZU, NOBUHIRO HARADA, KYUNG-HWA PARK, YUHKI SAKURAOKA, TAKAYUKI SHIRAKI, YUKIHIRO ISO, KEIICHI KUBOTA
In Vivo Jul 2020, 34 (4) 1893-1900; DOI: 10.21873/invivo.11985

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The ABO Blood Group Impacts the Survival of Patients Undergoing Pancreatoduodenectomy for Biliary Tract Cancer
SHOZO MORI, TAKU AOKI, KAZUMA TAGO, TAKAYUKI SHIMIZU, NOBUHIRO HARADA, KYUNG-HWA PARK, YUHKI SAKURAOKA, TAKAYUKI SHIRAKI, YUKIHIRO ISO, KEIICHI KUBOTA
In Vivo Jul 2020, 34 (4) 1893-1900; DOI: 10.21873/invivo.11985
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