Abstract
BACKGROUND
The albumin-bilirubin (ALBI) score is a serum biochemical indicator of liver function and has been proven to have prognostic value in a variety of cancers. In colorectal cancer (CRC), a high ALBI score tends to be associated with poorer survival.
AIM
To investigate the correlation between the preoperative ALBI score and outcomes in CRC patients who underwent radical surgery.
METHODS
Patients who underwent radical CRC surgery between January 2011 and January 2020 at a single clinical center were included. The ALBI score was calculated by the formula (log10 bilirubin × 0.66) + (albumin × -0.085), and the cutoff value for grouping patients was -2.8. The short-term outcomes, overall survival (OS), and disease-free survival (DFS) were calculated.
RESULTS
A total of 4025 CRC patients who underwent radical surgery were enrolled in this study, and there were 1908 patients in the low ALBI group and 2117 patients in the high ALBI group. Cox regression analysis revealed that age, tumor size, tumor stage, ALBI score, and overall complications were independent risk factors for OS; age, tumor stage, ALBI score, and overall complications were identified as independent risk factors for DFS.
CONCLUSION
A high preoperative ALBI score is correlated with adverse short-term outcomes, and the ALBI score is an independent risk factor for OS and DFS in patients with CRC undergoing radical surgery.
Keywords: Colorectal cancer, Albumin-bilirubin score, Overall survival, Disease-free survival, Outcomes
Core Tip: The albumin-bilirubin (ALBI) scoring system is an objective and convenient method for evaluating liver function, and its prognostic value in a variety of cancers has been gradually recognized. In this study, patients who underwent radical surgery for colorectal cancer (CRC) were enrolled and divided into a high-ALBI score group (ALBI score > -2.8) and a low-ALBI score group (ALBI score ≤ -2.8) according to the cutoff calculated with X-tile software, and the results showed that the ALBI score is an independent risk factor for overall survival and disease-free survival in CRC patients undergoing radical resection.
INTRODUCTION
Colorectal cancer (CRC) is the fourth most deadly cancer in the world, accounting for approximately 10% of total cancer-related deaths worldwide[1]. In the coming years, it is estimated that the incidence and mortality of CRC will continue to increase[2,3]. By 2040, the burden of CRC is expected to increase to 3.2 million new cases and 1.6 million related deaths[3]. Although there are different therapies available for CRC patients, including surgery, chemoradiotherapy, immunotherapy, and targeted therapy[4], the most important method for treating CRC is still radical surgery[5-7]. Nevertheless, even after undergoing radical surgery, the prognosis of CRC patients varies for many reasons, such as age[8], tumor stage[9,10], comorbidities[11-13], preoperative nutritional status[14], and postoperative complications[15,16]. Therefore, it is essential to comprehensively identify prognostic factors to improve the survival quality of these patients.
Albumin and bilirubin are serum biochemical indicators that reflect liver function to some extent[17,18]. The albumin-bilirubin (ALBI) scoring system, which is superior to the Child-Pugh grading system, was first described by Johnson et al[19] for assessing the liver function of patients with hepatocellular carcinoma (HCC). The prognostic utility of the system was gradually revealed in patients with HCC[20,21], gastric cancer[22,23], and pancreatic cancer[24,25]. Some studies have demonstrated that a higher ALBI score is also associated with a poor prognosis in CRC patients who underwent radical resection[26,27] and those who received chemotherapy[28] or targeted therapy[29].
Regarding the impact of the ALBI score on the short-term outcomes and long-term prognosis of CRC patients who underwent radical resection, Zhu et al[26] reported that the ALBI score is an independent risk factor for overall complications and overall survival (OS), and another study drew the same conclusion on OS[27]. However, limited by the sample size and retrospective nature of the study, the results above might not be accurate or reliable enough.
As a consequence, the purpose of this study was to investigate the correlation between the preoperative ALBI score and short-term outcomes as well as long-term prognosis in CRC patients who underwent radical surgery.
MATERIALS AND METHODS
Patient enrollment
Patients who underwent radical CRC surgery between January 2011 and January 2020 at a single clinical center were included. The study was approved by the ethics committee of our institution (The First Affiliated Hospital of Chongqing Medical University, 2024-011-01), and all patients signed an informed consent form. This study was conducted in accordance with the World Medical Association Declaration of Helsinki.
Inclusion and exclusion criteria
Patients who underwent primary CRC surgery were included in this study (n = 5473). The exclusion criteria were as follows: (1) Non-R0 CRC resection (n = 25); (2) incomplete clinical records (n = 323); (3) stage IV CRC (n = 875); and (4) incomplete total bilirubin/albumin examination (n = 225). Ultimately, a total of 4025 patients were included in this study (Figure 1).
Figure 1.
Flow chart of patient selection. CRC: Colorectal cancer.
Data collection
The baseline characteristics included the following: Age, sex, body mass index (BMI), smoking, drinking, hypertension, type 2 diabetes mellitus (T2DM), coronary heart disease (CHD), albumin level, total bilirubin level, ALBI, surgical history, tumor location, tumor-node-metastasis (TNM) stage, and tumor size. The short-term outcomes included operation time, intraoperative blood loss, blood transfusion, postoperative hospital stay, overall complications, and major complications. The long-term prognosis was predicted in terms of OS and disease-free survival (DFS). All the data were collected from the electronic medical records system or by outpatient visits and telephone interviews.
Definitions
TNM stage was determined according to the 8th edition of AJCC staging system[30]. Postoperative complications were classified on the basis of the Clavien–Dindo classification[31], and major complications were ≥ grade III. OS was defined as the time from surgery to death or loss to follow-up, and DFS was calculated from the date of surgery to the date of recurrence or death.
Treatment and follow-up
All patients underwent radical surgery according to standard principles. Patients were regularly followed up every 6 mo for the first three years and every year thereafter. An enhanced computed tomography scan was performed to determine whether the tumor had reoccurred.
ALBI score and groups
The ALBI score was calculated by the following formula: (log10 bilirubin × 0.66) + (albumin × -0.085), where bilirubin concentration is in μmol/L and albumin concentration is in g/L[19]. The cutoff that we adopted was -2.8 (according to the cutoff calculated with X-tile software)[32]. Then, the patients enrolled were divided into a high-ALBI score group (ALBI > -2.8) and a low-ALBI score group (ALBI ≤ -2.8).
Statistical analysis
Continuous variables are expressed as the mean ± SD, and an independent-sample t-test was used to compare the differences between the high-ALBI score group and the low-ALBI score group. Categorical variables are expressed as absolute values and percentages, and the chi-square test or Fisher’s exact test was performed for comparisons. The Kaplan-Meier method was used to estimate OS and DFS, and the log-rank test was used to compare OS and DFS between the two groups at different tumor stages. Moreover, Cox regression analysis was performed to identify independent risk factors for OS and DFS. The data were analyzed using IBM SPSS Statistics for Windows, version 22.0 (IBM Corp., Armonk, NY, United States). A two-sided P value < 0.05 was considered to indicate statistical significance.
RESULTS
Characteristics of included patients
A total of 4025 CRC patients who underwent radical surgery were included in this study. According to the cutoff of the ALBI score, there were 1908 patients in the low ALBI group and 2117 in the high ALBI group. At baseline, the patients in the high ALBI group were older (P < 0.01) and had a lower BMI (P < 0.01), greater incidence of CHD (P < 0.01), greater total bilirubin concentration (P < 0.01), lower albumin concentration (P < 0.01), greater rate of open surgery (P < 0.01), and greater incidence of rectal cancer (P < 0.01) than those in the low ALBI group. In addition, fewer patients in the high ALBI group than in the low ALBI group had TNM stage I disease (P < 0.01) and tumors smaller than 5 cm (P < 0.01) (Table 1).
Table 1.
Baseline information of high albumin-bilirubin group and low albumin-bilirubin group, n (%)
|
Characteristic
|
Low ALBI (1908)
|
High ALBI (2117)
|
P value
|
| Age, years | 60.0 ± 11.6 | 65.4 ± 12.1 | < 0.01a |
| Sex | 0.096 | ||
| Male | 1098 (57.5) | 1273 (60.1) | |
| Female | 801 (42.5) | 844 (44.2) | |
| BMI, kg/m2 | 23.1 ± 3.1 | 22.4 ± 3.3 | < 0.01a |
| Smoking | 707 (37.1) | 813 (38.4) | 0.378 |
| Drinking | 580 (30.4) | 650 (30.7) | 0.834 |
| Hypertension | 475 (24.9) | 575 (27.2) | 0.102 |
| T2DM | 225 (11.8) | 273 (12.9) | 0.289 |
| CHD | 55 (2.9) | 117 (5.5) | < 0.01a |
| Albumin, g/L | 44.3 ± 3.8 | 36.3 ± 4.1 | < 0.01a |
| Total bilirubin, μmol/L | 10.9 ± 5.4 | 12.0 ± 6.3 | < 0.01a |
| ALBI | -3.1 ± 0.3 | -2.4 ± 0.3 | < 0.01a |
| Surgical history | 446 (23.4) | 500 (23.6) | 0.856 |
| Open surgery | 163 (8.5) | 365 (17.2) | < 0.01a |
| Tumor location | < 0.01a | ||
| Colon | 1132 (59.3) | 1005 (47.5) | |
| Rectum | 776 (40.7) | 1112 (52.5) | |
| TNM stage | < 0.01a | ||
| I | 449 (23.5) | 348 (16.4) | |
| II | 770 (40.4) | 956 (45.2) | |
| III | 689 (36.1) | 813 (38.4) | |
| Tumor size | < 0.01a | ||
| < 5 cm | 1241 (65.0) | 1106 (52.2) | |
| ≥ 5 cm | 667 (35.0) | 1011 (47.8) |
P < 0.05.
ALBI: Albumin-bilirubin; T2DM: Type 2 diabetes mellitus; BMI: Body mass index; CHD: Coronary heart disease.
Short-term outcomes
In the high ALBI group, patients had longer postoperative hospital stays (P = 0.001), greater intraoperative blood loss (P = 0.001), and more overall complications (P < 0.01) and more major complications (P < 0.01) than those in the low ALBI group, and the differences were all significant (Table 2).
Table 2.
Short-term outcomes in high albumin-bilirubin group and low albumin-bilirubin group
|
Characteristic
|
Low ALBI (1908)
|
High ALBI (2117)
|
P value
|
| Operation time (min) | 223.6 ± 79.6 | 226.3 ± 81.7 | 0.295 |
| Intraoperative blood loss (mL) | 90.5 ± 122.5 | 104.4 ± 139.4 | 0.001a |
| Blood transfusion (%) | 25 (1.3) | 51 (2.4) | 0.011 |
| Postoperative hospital stay (d) | 10.7 ± 9.4 | 11.6 ± 8.0 | 0.001a |
| Overall complications (%) | 323 (16.9) | 557 (26.3) | < 0.01a |
| Major complications (%) | 32 (1.7) | 61 (2.9) | < 0.01a |
P < 0.05.
ALBI: Albumin-bilirubin.
Survival analysis
OS and DFS were observed by regular follow-up with a median follow-up period of 35 (1 to 114) mo. We compared DFS and OS between patients in the high ALBI group and the low ALBI group at different TNM stages. The high ALBI group had a worse OS for patients in all stages (P < 0.01), stage II (P < 0.01), and stage III (P < 0.01). Similarly, worse DFS was found in the high ALBI group for patients in all stages (P < 0.01), stage II (P = 0.004), and stage III (P < 0.01) (Figures 2 and 3).
Figure 2.
Kaplan-Meier survival curve analysis for impact of preoperative albumin-bilirubin score on overall survival of patients in all tumor-node-metastasis stages, stage I, stage II, and stage III. A: All tumor-node-metastasis stages; B: Stage I; C: Stage II; D: Stage III. ALBI: Albumin-bilirubin.
Figure 3.
Kaplan-Meier survival curve analysis for impact of preoperative albumin-bilirubin score on disease-free survival of patients in all tumor-node-metastasis stages, stage I, stage II, and stage III. A: All tumor-node-metastasis stages; B: Stage I; C: Stage II; D: Stage III. ALBI: Albumin-bilirubin.
Univariate and multivariate analysis for OS
For OS, in the univariate analysis, age (hazard ratio [HR]: 1.045, P < 0.01), BMI (HR: 0.952, P < 0.01), T2DM (HR: 1.280, P = 0.048), tumor size (HR: 1.464, P < 0.01), tumor stage (HR: 2.133, P < 0.01), ALBI score (HR: 1.900, P < 0.01), and overall complications (HR: 1.886, P < 0.01) were potential risk factors. Age (HR: 1.038, P < 0.01), tumor stage (HR: 2.099, P < 0.01), tumor size (HR: 1.231, P = 0.017), ALBI score (HR: 1.368, P = 0.001), and overall complications (HR: 1.619, P < 0.01) were found to be independent risk factors in the multivariate Cox analysis (Table 3).
Table 3.
Univariate and multivariate analysis of overall survival
| Risk factor |
Univariate analysis
|
Multivariate analysis
|
||
|
HR (95%CI)
|
P value
|
HR (95%CI)
|
P value
|
|
| Age (years) | 1.045 (1.037-1.053) | < 0.01a | 1.038 (1.030-1.046) | < 0.01a |
| Sex (male/female) | 0.873 (0.733-1.040) | 0.128 | ||
| BMI (kg/m2) | 0.952 (0.926-0.978) | < 0.01a | 0.984 (0.958-1.012) | 0.263 |
| T2DM (yes/no) | 1.280 (1.002-1.633) | 0.048a | 0.981 (0.765-1.259) | 0.883 |
| Tumor site (colon/rectum) | 1.173 (0.989-1.390) | 0.066 | ||
| Tumor stage (III/II/I) | 2.133 (1.864-2.440) | < 0.01a | 2.099 (1.830-2.407) | < 0.01a |
| Smoking (yes/no) | 1.055 (0.887-1.256) | 0.543 | ||
| Drinking (yes/no) | 1.025 (0.852-1.232) | 0.796 | ||
| Hypertension (yes/no) | 1.016 (0.836-1.234) | 0.874 | ||
| Tumor size (≥ 5 cm/< 5 cm) | 1.464 (1.235-1.736) | < 0.01a | 1.231 (1.037-1.461) | 0.017a |
| ALBI (high/low) | 1.900 (1.587-2.274) | < 0.01a | 1.368 (1.134-1.649) | 0.001a |
| Overall complications (yes/no) | 1.886 (1.580-2.252) | < 0.01a | 1.619 (1.353-1.938) | < 0.01a |
P < 0.05.
BMI: Body mass index; T2DM: Type 2 diabetes mellitus, ALBI: Albumin-bilirubin.
Univariate and multivariate analysis for DFS
With regard to DFS, the univariate analysis demonstrated that age (HR: 1.033, P < 0.01), BMI (HR: 0.972, P = 0.023), tumor size (HR: 1.320, P < 0.01), tumor stage (HR: 2.046, P < 0.01), ALBI score (HR: 1.585, P < 0.01), and overall complications (HR: 1.686, P < 0.01) were significantly associated with worse DFS. Furthermore, age (HR: 1.027, P < 0.01), tumor stage (HR: 2.020, P < 0.01), ALBI score (HR: 1.504, P < 0.01), and overall complications (HR: 1.241, P = 0.010) were identified as independent risk factors in the multivariate Cox analysis (Table 4).
Table 4.
Univariate and multivariate analysis of disease-free survival
| Risk factor |
Univariate analysis
|
Multivariate analysis
|
||
|
HR (95%CI)
|
P value
|
HR (95%CI)
|
P value
|
|
| Age (years) | 1.033 (1.026-1.040) | <0.01a | 1.027 (1.020-1.035) | < 0.01a |
| Sex (male/female) | 0.885 (0.757-1.035) | 0.127 | ||
| BMI (kg/m2) | 0.972 (0.949-0.996) | 0.023a | 0.997 (0.973-1.021) | 0.777 |
| T2DM (yes/no) | 1.129 (0.899-1.418) | 0.297 | ||
| Tumor site (colon/ rectum) | 1.095 (0.940-1.276) | 0.245 | ||
| Tumor stage (III/II/I) | 2.046 (1.816-2.305) | < 0.01a | 2.020 (1.790-2.280) | < 0.01a |
| Smoking (yes/no) | 1.037 (0.918-1.255) | 0.374 | ||
| Drinking (yes/no) | 1.029 (0.872-1.214) | 0.736 | ||
| Hypertension (yes/no) | 1.027 (0.863-1.223) | 0.763 | ||
| Tumor size (≥ 5 cm/< 5 cm) | 1.320 (1.133-1.538) | < 0.01a | 1.134 (0.972-1.323) | 0.110 |
| ALBI (high/low) | 1.585 (1.354-1.855) | < 0.01a | 1.504 (1.276-1.774) | < 0.01a |
| Overall complications (yes/no) | 1.686 (1.433-1.983) | < 0.01a | 1.241 (1.053-1.463) | 0.010a |
P < 0.05.
BMI: Body mass index; T2DM: Type 2 diabetes mellitus, ALBI: Albumin-bilirubin.
DISCUSSION
In this retrospective study, 4025 CRC patients who underwent radical surgery were enrolled. According to the cutoff of the ALBI score, there were 1908 patients in the low ALBI group and 2117 patients in the high ALBI group. In the high ALBI group, patients had longer postoperative hospital stays, more intraoperative blood loss, and more overall complications and major complications. Survival analysis revealed that patients in the high ALBI group had worse OS and DFS than patients in the low ALBI group with tumors of all TNM stages, stage II tumors, and stage III tumors. Furthermore, the preoperative ALBI score was identified as an independent risk factor for OS and DFS.
The prognostic value of the ALBI score for CRC patients has been reported in recent years. Abdel-Rahman[28] reported that a higher baseline ALBI score was an independent risk factor for OS (P < 0.001) and progression-free survival (P < 0.001) in CRC patients with liver metastasis after chemotherapy. Next, the association between the ALBI score and the prognosis of metastatic CRC patients treated with regorafenib was shown in another retrospective study[29]. However, this group did not focus on CRC patients who underwent radical surgery. Zhu et al[26] first demonstrated that a high preoperative ALBI score was an independent indicator for both postoperative complications (38.2% vs 17.6%, P < 0.001) and OS (mean survival time, 47.6 mo vs 54.3 mo, P = 0.005) in 284 patients after radical surgery, and Koh et al[27] drew the same conclusion on OS (5-years OS, 86% vs 61.5%, P = 0.002). In our study, we found more postoperative complications in the high ALBI group, and the ALBI score was identified as an independent risk factor for OS, which was in accordance with the results of previous studies. The detailed information of the previous four studies is shown in Table 5.
Table 5.
Previous studies reporting the albumin-bilirubin score of colorectal cancer patients
|
Ref.
|
Year
|
Country
|
Sample size
|
High ALBI, n (%)
|
Patients
|
Outcomes
|
| Zhu et al[26] | 2020 | China | 284 | 165 (58.1) | CRC | ALBI score was an independent indicator for postoperative complications and OS after radical surgery |
| Koh et al[27] | 2022 | South Korea | 1015 | 173 (17.0) | CRC | ALBI score was an independent risk factor for OS in patients after radical CRC patients |
| Abdel-Rahman[28] | 2019 | Canada | 1434 | 648 (45.2) | mCRC | ALBI score was an independent risk factor for OS and progression-free survival in CRC patients with liver metastasis after chemotherapy |
| Watanabe et al[29] | 2021 | Japan | 60 | 28 (46.7) | CRC | High-ALBI group had shorter OS, and was correlated with shorter time to treatment failure and liver dysfunction in CRC patients treated with regorafenib |
CRC: Colorectal cancer; mCRC: Metastatic colorectal cancer; ALBI: Albumin-bilirubin; OS: Overall survival.
We analyzed the impact of the preoperative ALBI score on OS and DFS of patients with tumors at different stages and found that the high ALBI group had worse OS and DFS for tumors at all stages, especially at stage II and stage III, than the low ALBI group. The results above indicated that even in patients who should have a good prognosis according to the TNM stage, the prognostic value of the ALBI score cannot be ignored. Although Zhu et al[26] reported that only patients in TNM stage III had a worse OS in the high ALBI group (mean survival time, 42.7 mo vs 51.6 mo, P = 0.036), the difference might be caused by the limited sample size of their study.
The ALBI scoring system was established based on the serum levels of ALB and bilirubin, which is an objective and convenient method for estimating liver function[33]. Hypoalbuminemia significantly increases postoperative complications and worsens OS in CRC patients after surgery[34,35]. In addition, some studies also illustrated that elevated serum bilirubin was an independent risk factor for OS[36,37], which might help to explain the prognostic value of the ALBI score. Serum albumin levels are closely correlated with nutritional status, and malnutrition can lead to a delay in recovery, increase the risk of infection, and impair immunity[22,33,38], resulting in more postoperative complications. Impaired immunity also causes the immune escape of tumor cells, which accelerates tumor recurrence and metastasis[39]. Moreover, elevated serum bilirubin often indicates liver dysfunction, and the latter might discontinue chemotherapy, which further influences OS and DFS[27,40]. However, our understanding of the underlying mechanism remains insufficient, and more studies are needed to clarify this issue.
Compared with previous studies, the baseline information in our study is more comprehensive. Additionally, a relatively large sample size of 4025 patients was included in our study, which was helpful for reducing bias and obtaining more reliable conclusions. However, our study has several limitations. Because this was a retrospective study conducted in a single center in southern China, biases were inevitable, and whether the results could be applied to other regions remains to be confirmed. Accordingly, to explore the prognostic role of the ALBI score in CRC patients after radical surgery, further multicenter prospective studies are needed.
CONCLUSION
A high preoperative ALBI score is correlated with adverse short-term outcomes, and the ALBI score is an independent risk factor for OS and DFS in patients with CRC undergoing radical surgery. Surgeons should take measures to improve the ALBI score preoperatively. However, despite the large sample size, this was a single-center retrospective study. Multicenter prospective studies are needed in the future to confirm our findings.
ACKNOWLEDGEMENTS
We acknowledge all the authors whose publications are referred in our article.
Footnotes
Institutional review board statement: This study was reviewed and approved by the Ethics Committee of The First Affiliated Hospital of Chongqing Medical University.
Informed consent statement: This is a retrospective study, and the patients came from a teaching hospital of the First Affiliated Hospital of Chongqing Medical University. When we delivered the ethics application, we also delivered application for exemption of informed consent.
Conflict-of-interest statement: The authors declare no conflicts of interest for this article.
Provenance and peer review: Unsolicited article; Externally peer reviewed.
Peer-review model: Single blind
Specialty type: Gastroenterology and hepatology
Country of origin: China
Peer-review report’s classification
Scientific Quality: Grade C, Grade C
Novelty: Grade B, Grade B
Creativity or Innovation: Grade B, Grade B
Scientific Significance: Grade B, Grade B
P-Reviewer: Arumugam VA, India S-Editor: Qu XL L-Editor: Wang TQ P-Editor: Wang WB
Contributor Information
Yu-Hang Diao, Department of Gastrointestinal Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China.
Xin-Peng Shu, Department of Gastrointestinal Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China.
Can Tan, Department of Gastrointestinal Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China.
Li-Juan Wang, Department of Gastrointestinal Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China.
Yong Cheng, Department of Gastrointestinal Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China. chengyongcq@163.com.
Data sharing statement
The datasets generated and/or analyzed during the current study are not publicly available due but are available from the corresponding author upon reasonable request.
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Data Availability Statement
The datasets generated and/or analyzed during the current study are not publicly available due but are available from the corresponding author upon reasonable request.