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Clinical implication of the advanced lung cancer inflammation index in patients with right-sided colon cancer after complete mesocolic excision: a propensity score-matched analysis
World Journal of Surgical Oncology volume 20, Article number: 246 (2022)
This study aimed to assess the clinical implications of the advanced lung cancer inflammation index (ALI) in patients with right-sided colon cancer (RCC) after complete mesocolic excision (CME).
A total of 441 patients with RCC who underwent CME were included. The optimal cut-off value for the ALI was determined using the X-tile software. Logistic and Cox regression analyses were used to identify risk factors for postoperative complications and long-term outcomes. Predictive nomograms for overall survival (OS) and disease-free survival (DFS) were constructed after propensity score matching (PSM), and their performance was assessed using the net reclassification improvement index (NRI), integrated discrimination improvement index (IDI), and time-dependent receiver operating characteristic (time-ROC) curve analysis.
The optimal preoperative ALI cut-off value was 36.3. After PSM, ASA classification 3/4, operative duration, and a low ALI were independently associated with postoperative complications in the multivariate analysis (all P<0.05). Cox regression analysis revealed that an age >60 years, a carbohydrate antigen 19-9 (CA19-9) level >37 U/mL, pathological N+ stage, and a low ALI were independently correlated with OS (all P<0.05). A CA19-9 level >37 U/mL, pathological N+ stage, lymphovascular invasion, and a low ALI were independent predictors of DFS (all P<0.05). Predictive nomograms for OS and DFS were constructed using PSM. Furthermore, a nomogram combined with the ALI was consistently superior to a non-ALI nomogram or the pathological tumor-node-metastasis classification based on the NRI, IDI, and time-ROC curve analysis after PSM (all P<0.05).
The ALI was an effective indicator for predicting short- and long-term outcomes in patients with RCC.
Colon cancer, one of the most common cancers, is the third most common cause of cancer-related deaths worldwide . Right-sided colon cancer (RCC) is a distinct entity in terms of its anatomy, biology, and prognosis compared with left-sided colon cancer . Complete mesocolic excision (CME) with D3 lymph node dissection is the surgical principle for RCC that can improve surgical quality and, thus, oncological outcomes [3, 4]. However, tumor recurrence and metastasis remain significant factors that contribute to poor patient survival . Systemic inflammation is closely associated with tumor development and progress . Nutritional indicators are also associated with the prognosis of various malignancies [7, 8]. The advanced lung cancer inflammation index (ALI), a novel inflammation and nutrition-based index defined by combining body the mass index (BMI), preoperative serum albumin (ALB) level, and neutrophil-to-lymphocyte ratio (NLR), has been proposed as a prognostic biomarker for various malignant tumors, including lung, esophageal, gastric, and colorectal cancers [9,10,11,12,13,14]. In colon cancer, patients with RCC tend to experience malnutrition before surgery, leading to immune depression . No large-scale study has evaluated the clinical implications of preoperative ALI in patients with RCC yet.
The American Joint Committee on Cancer (AJCC) staging system is most commonly used to assess the prognosis of cancer patients . The current tumor-node-metastasis (TNM) framework relies exclusively on locoregional tumor expansion(s) of the primary tumor but neglects substantial tumor- and host-related biological differences . However, survival may differ in patients with RCC, even among those with the same TNM stage. Therefore, combining the AJCC/TNM staging system with other prognostic indicators may improve the individual prognosis prediction of patients with RCC and facilitate treatment decision-making.
In this context, the present study aimed to explore the prognostic value of the ALI and to establish a simple scoring system based on the ALI to effectively predict the short- and long-term outcomes of patients with RCC after CME.
A total of 441 consecutive patients who underwent CME with D3 lymph node dissection for RCC between January 2012 and December 2016 at our department were included. Clinicopathological data were collected from the colorectal cancer database. The inclusion criteria were as follows: colon adenocarcinoma; tumors in the ileocecum, ascending colon, or right colic flexure; and pathological stage I–III disease. Individuals who underwent emergency surgery, had synchronous or metachronous multiple primary colorectal cancer(s), and those with incomplete clinicopathological data were excluded.
Definitions, surgical procedures, adjuvant chemotherapy, and follow-up
All laboratory data were obtained within 2 weeks before surgery. Preoperative anemia was defined as a hemoglobin level < 120 g/L. The formulae for calculating the ALI, systemic inflammation index (SII) , and prognostic nutritional index (PNI)  were as follows: ALI= BMI × albumin/NLR; SII = platelet (1011/L) × NLR; PNI = preoperative serum albumin (g/L) + 5 × total preoperative lymphocyte count (109/L). All patients underwent radical surgery following the principle of CME  with D3 lymph node dissection. Approximately 4 to 8 weeks after radical resection, patients with high-risk stage II and stage III disease underwent four to eight cycles of 5-fluorouracil-based adjuvant chemotherapy for 3 to 6 months, including the “XELOX” and “FOLFOX” regimens. Postoperative surveillance was conducted every 3 months for the first 2 years, twice per year for the next 3 years, and once per year thereafter, including serum carcinoembryonic antigen (CEA), chest computed tomography (CT), and abdominopelvic magnetic resonance imaging (MRI) or CT. Colonoscopy was performed 3 months to 1 year after surgery and once every year thereafter. Follow-up information was obtained through clinics or telephonic interviews. Information regarding patients lost to follow-up was obtained from the Chinese Population Registration and Health Insurance System. Patient follow-up was performed until death or April 1, 2021.
Statistical analyses were performed using SPSS version 20.0 (IBM SPSS Statistics, Chicago, IL, USA) and the R software (version 3.6.1). The X-tile software  was used to identify the optimal cut-off values for the ALI, PNI, and SII according to 5-year overall survival (OS). To minimize the biasing effects of confounders, a 1:1 caliper width of 0.2 for the propensity score matching (PSM) analysis was performed on the following variables: age, sex, preoperative CEA and carbohydrate antigen 19-9 (CA19-9) levels, pT stage, pN stage, pTNM stage, histological tumor differentiation, nerval invasion (NI), and lymphovascular invasion (LVI). Pairs of patients were selected using the “nearest-neighbor” matching method. The chi-squared test or Fisher’s exact test was used to compare categorical variables, and the Student’s t test was used to compare continuous variables. Logistic regression analyses were performed to identify independent risk factors for postoperative complications. Cox proportional hazard models were used to evaluate the prognostic value of the ALI. The prognostic efficacy of different models was assessed according to the net reclassification improvement index (NRI) [21, 22], integrated discrimination improvement index (IDI) [21, 22], and time-dependent receiver operating characteristic (time-ROC) curve analysis. Differences with P<0.05 were considered to be statistically significant.
Among the 441 patients included in this study, 236 (53.5%) and 205 (46.5%) were classified as having a low and high ALI, respectively, based on the ALI cut-off value of 36.3 for 5-year OS according to the X-tile program (Supplementary Figure 1A). Similarly, 262 (59.4%) and 179 (40.6%) patients were divided into low and high PNI groups (cut-off value of 48 for 5-year OS) (Supplementary Figure 1B), respectively, while 165 (37.4%) and 276 (62.6%) patients were included in the low and high SII groups (cut-off value of 427 for 5-year OS) (Supplementary Figure 1C), respectively. The predictive ability of the ALI for 5-year OS was better than that of the PNI (area under curve (AUC) 0.644 [95% CI 58.90–69.88] vs. 0.600 [95% CI 52.36–63.72]; P<0.001) or SII (AUC 0.644 [95% CI 58.90–69.88] vs. 0.580 [95% CI 54.62–65.40]; P<0.001) (Supplementary Figure 2A). The ALI was superior to the PNI (AUC 0.609 [95% CI 55.02–66.90] vs. 0.556 [95% CI 49.49–61.61]; P=0.014) and SII (AUC 0.609 [95% CI 55.02–66.90] vs. 0.555 [95% CI 49.66–61.50]; P=0.005) in predicting 5-year disease-free survival (DFS) (Supplementary Figure 2B).
The clinicopathological characteristics of all patients with RCC are summarized in Table 1. After 1:1 PSM, 180 paired patients were matched to the low and high ALI groups. Most covariates were well balanced, except for preoperative anemia (P=0.003), surgical approach (P=0.004), and postoperative hospital stay (P=0.014).
Correlation between the ALI and postoperative morbidity
A total of 114 (25.9%) patients developed postoperative complications before PSM, with the majority classified as having Clavien-Dindo classification grades II–III, among whom 23 experienced ≥ 2 complications. The most frequent morbidity was pneumonia (12.5% [n=55]), followed by chylous ascites (10.2% [n=45]), urinary tract infection (3.4% [n=15]), postoperative ileus (2.5% [n=11]), surgical site infection (2.0% [n=9]), intra-abdominal infection (1.6% [n=7]), delayed gastric emptying (1.1% [n=5]), intra-abdominal bleeding (0.5% [n=1]), and septicemia (0.2% [n=1]). No complication-related deaths occurred.
After PSM, the American Society of Anesthesiologists (ASA) classification 3/4 (odds ratio [OR]: 2.843, [95% CI 1.276–6.334]; P=0.011), operative duration (OR 1.723, P=0.032), and a low ALI (OR 1.983, P=0.007) were found to be independent predictors of postoperative complications (Table 2).
Correlations between the ALI and survival outcomes in the non-PSM and PSM cohorts
The median follow-up duration was 65 months (range, 3–110 months). Before PSM, the 5-year OS rates in low and high ALI patients were 71.0% and 90.5%, respectively. The 5-year cumulative recurrence rates in patients with low and high ALI were 26.7% and 11.5%, respectively. A low ALI was significantly associated with poor 5-year OS (P<0.001) (Supplementary Figure 3A) and DFS (P<0.001) (Supplementary Figure 3B).
After PSM, the 5-year OS rates in low and high ALI patients were 69.1% and 89.1%, respectively. The 5-year cumulative recurrence rates in patients with a low and high ALI were 26.9% and 13.2%, respectively. Patients with a low ALI had worse 5-year OS (P<0.001; Fig. 1A) and DFS (P=0.001; Fig. 1B) than those with a high ALI. Predictive values of the ALI at different stages were compared. In stage I patients, the 5-year OS was comparable between the high and low ALI groups (P=0.254; Fig. 2A). Patients with a low ALI had a worse 5-year OS than those with a high ALI in stage II (P=0.02; Fig. 2B) and stage III (P=0.01; Fig. 2C). There was no significant difference in the 5-year DFS between a high and low ALI in stage I patients (P=0.254; Fig. 2D). Patients with a low ALI had worse 5-year DFS than those with a high ALI in stage II (P = 0.031, Fig. 2E) and stage III (P=0.04; Fig. 2F).
Cox regression analysis of risk factors for OS and DFS in the non-PSM cohort
In the non-PSM cohort, multivariate Cox regression analysis revealed that CA19-9 >37 U/mL (hazard ratio [HR]=1.879, P=0.007), pathological N+ stage (HR=3.164, P=0.001), LVI (HR=1.954, P=0.008), NI (HR=1.815, P=0.026), and a low ALI (HR=3.340, P<0.001) were independently associated with worse 5-year OS in patients who underwent CME (Supplementary Table 1).
Multivariate Cox regression analysis revealed that male sex (HR=2.156, P=0.002), CA19-9 >37 U/mL (HR=1.886, P=0.011), pathological N+ stage (HR=2.261, P=0.010), LVI (HR=2.285, P =0.002), and a low ALI (HR=2.611, P<0.001) were independently associated with 5-year DFS (Supplementary Table 2).
Cox regression analysis of risk factors for OS and DFS in the PSM cohort
In the PSM cohort, multivariate Cox regression analysis revealed that age >60 years (HR=1.954, P=0.007), CA19-9 >37 U/mL (HR=1.964, P=0.011), pathological N+ stage (HR=3.266, P<0.001), and a low ALI (HR=3.305, P<0.001) were independently correlated with OS (Table 3).
In the multivariate analysis, CA19-9 >37 U/mL (HR=1.821, P=0.028), pathological N+ stage (HR=2.373, P=0.011), LVI (HR=2.271, P=0.005), and a low ALI (HR=2.389, P=0.001) remained as independent predictors of DFS (Table 4).
Comparison of the prediction efficiency of the ALI and other parameters in the PSM cohort
Next, predictive nomograms for OS and DFS were constructed (Fig. 3A, B). The prognostic accuracy of the ALI was assessed against that of other parameters by performing a time-ROC curve analysis (Fig. 3C, D). The AUC for the nomogram combined with the ALI was optimal compared with that of the non-ALI nomogram (0.773 [95% CI 0.713–0.833]) vs. 0.740 (95% CI 0.680–0.800), P=0.014] and pTNM stage (0.773 [95% CI 0.713–0.833] vs. 0.692 [95% CI 0.629–0.754]; P<0.001) for 5-year OS (Fig. 3C). The AUC of the nomogram was better than that of the non-ALI nomogram (0.713 [95% CI 0.641–0.786]) vs. 0.689 [95% CI 0.617–0.760]; P=0.039) and pTNM stage (0.713 [95% CI 0.641–0.786] vs. 0.656 [95% CI 0.590–0.721]; P=0.002) for 5-year DFS (Fig. 3D).
In addition, the predictive ability of the nomogram combined with the ALI for 5-year OS was significantly improved compared with that of the nomogram without the ALI; its NRI increased by 24.3% (P=0.002) and IDI increased by 6.0% (P=0.002). Compared with the nomogram without the ALI, the nomogram with the ALI for 5-year OS demonstrated better predictive efficacy, its NRI increased by 32.4% (P<0.001), and IDI increased by 9.4% (P<0.001). The nomogram combined the ALI was optimal when compared with non-ALI nomogram and pTNM stage for 5-year DFS; its NRI increased by 16.8% (P=0.042) and 9.5% (P=0.042), and its IDI increased by 3.3% (P=0.040) and 7.5% (P=0.002) (Table 5).
Compared with left-sided colon cancer, RCC has a worse prognosis and poorer survival after recurrence [23,24,25]. Therefore, identifying high-risk patients with RCC after CME may aid in designing individualized treatment strategies. Currently, no studies have assessed the clinical significance of immunonutritional indicators among patients with RCC after CME. In the present study, the ALI was independently associated with short- and long-term outcomes in RCC patients after PSM analysis. In addition, the nomogram combined with the ALI demonstrated better predictive performance than that of the TNM staging system.
Inflammation and nutrition play important roles in evaluating cancer prognosis [7, 8, 26]. Nutritional and immune biomarkers in the peripheral blood, including albumin, globulin, lymphocytes, and neutrophils, are associated with the prognosis of colorectal cancer . The inflammatory index can reflect the host’s immunity to cancer progression and is closely related to recurrence-free survival and OS . Tumors can also affect the immune system in a pro-tumorigenic manner, increasing neutrophil and monocyte counts and decreasing lymphocyte counts . Neutrophils and monocytes have been reported to be involved in cancer occurrence, growth, proliferation, and metastasis, whereas lymphocytes inhibit cancer occurrence and growth through immune surveillance . Additionally, the serum albumin level is correlated with systemic inflammation during tumor proliferation and invasion, stimulates pro-inflammatory factors, and decreases albumin levels by regulating liver cell catabolism and anabolism [29, 30]. The ALI is a simple index available from routine blood tests and can be easily obtained in daily clinical practice. The correlation between the ALI and patient prognosis has been confirmed in several cancers [9,10,11]. However, few studies have focused on the clinical significance of the ALI among patients with RCC [12,13,14].
Previous studies have reported that serological inflammation-based indices (SII, NLR, and PLR) are associated with postoperative complications [31, 32]. Nutritional indicators (sarcopenia, BMI, and serum albumin level) have been used to predict postoperative complications [33,34,35]. In our patient cohort, most postoperative complications were infection-related. A low ALI was independently associated with postoperative morbidity. Patients with a low ALI are prone to developing postoperative complications related to poor host immune status. After PSM, the ALI remained an effective indicator for predicting postoperative complications, consistent with a previous study . Together, these findings indicate that the ALI may be an effective index for predicting postoperative complications in patients with RCC. Adequate preoperative nutritional support may be beneficial reduce postoperative complications.
The ALI was independently correlated with OS and DFS compared with other combined indicators, such as PNI and the SII, owing to a complete response to systemic inflammation and the nutritional status . Malnourished patients are at a higher risk for postoperative complications and, thus, have a poor prognosis after colorectal cancer surgery . Pater et al. found that RCC was associated with a high tumor lymphocytic infiltrate and elevated systemic inflammation . A previous study demonstrated that RCC is associated with worse prognosis than that of left-sided colon cancer . Therefore, it is important to investigate the prognostic value of the ALI in those with RCC.
A low ALI is correlated with poor prognosis in many solid cancers [9,10,11, 33]. A low ALI score indicates impaired nutritional status and high inflammation levels. The nutritional status can also influence the host immune function . Inflammation may become chronic, promote reactive oxygen and nitrogen production, and induce angiogenesis and cell proliferation, thus playing an essential role in tumorigenesis . Kusunoki et al. found that a low ALI was correlated with poor OS and DFS in patients with colorectal cancer . As expected, RCC patients with a low ALI had a significantly worse prognosis than those with a high ALI, particularly those in stage II and III patients. We suggest that the ALI could be used in the decision-making process when designing tailored treatments for patients.
The UICC/AJCC TNM staging system for colorectal cancer plays a significant role in evaluating treatment effects and patient prognosis . However, tumor heterogeneity is common among patients with the same type of malignant tumors. A single evaluation indicator is often less sensitive in predicting prognosis, which often causes difficulties in managing patients postoperatively. Therefore, we constructed a nomogram combined with the ALI and non-ALI nomograms based on the independent risk factors in the multivariate analysis and used the time-ROC curve to compare the predictive capabilities between the pTNM stage and the two models. We found that the nomogram combined with the ALI was better than the non-ALI nomogram and TNM staging in terms of the predictive accuracy for 5-year OS and DFS. To further explore the value of the ALI in the nomogram in this study, the NRI and IDI were calculated. The NRI was used to quantify the difference in classification changes between the two models, and the IDI was used to quantify the probability difference between the two models [21, 22]. The predictive ability of the nomogram with the ALI for 5-year OS and DFS was significantly improved compared to that of the nomogram without the ALI and pTNM stage (all P<0.05). Therefore, the ALI can supplement the traditional TNM staging method in clinical practice to facilitate preoperative risk stratification and prognosis assessment for patients with RCC and effectively guide subsequent treatment strategies.
Postoperative adjuvant chemotherapy among stage II and III patients has been shown to improve long-term outcomes . However, adjuvant chemotherapy failed to identify an independent protective factor affecting prognosis in this study. This is because high-risk stage II and III patients with RCC tend to undergo adjuvant chemotherapy . When evaluating the effects of adjuvant chemotherapy, selection bias should always be considered in retrospective studies. Therefore, our study could not demonstrate a correlation between adjuvant chemotherapy and the ALI.
Postoperative surveillance aims to identify recurrence(s) and improve survival rates. However, an optimal surveillance strategy is yet to be determined. The FACS trial revealed that intensive surveillance resulted in an increased rate of surgical treatment of recurrence with curative intent . Patients with a low ALI demonstrated poor 5-year OS and DFS rates. We recommend that more intensive follow-up strategies be implemented for patients with a low ALI in stage II and III; CEA monitoring and lung and abdominal CT should be performed every 3 months in the first 2 years instead of every 6 months . This would be more conducive to the detection and treatment of early recurrences.
The present study had several limitations, the first of which were its retrospective design and relatively small sample size. Second, preoperative serum albumin, neutrophil, and lymphocyte levels may be influenced by many factors. Third, the cut-off values for the ALI reported in the literature vary, which may be due to the local tumor and sample sizes in previous studies, thus resulting in bias. Fourth, preoperative anemia, surgical approach, and postoperative hospital stay were statistically different between the two groups, which may have biased the results after PSM. Therefore, a prospective study is required to determine the optimal cut-off value to accurately predict the prognosis of patients with cancer.
This study was the first to demonstrate that the preoperative ALI is an effective indicator for predicting short- and long-term prognosis in patients with RCC. These findings may help clinicians choose the most effective biomarkers by combining inflammation with immunity as part of individualized treatment strategies for patients with RCC, particularly those in stages II and III, to guide preoperative treatment decision-making and postoperative follow-up strategies.
Availability of data and materials
The data used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Right-sided colon cancer
Complete mesocolic excision
Advanced lung cancer inflammation index
Body mass index
Neutrophil to lymphocyte ratio
American Joint Committee on Cancer
Systemic inflammation index
Prognostic nutritional index
Carbohydrate antigen 19-9
American Society of Anesthesiologists
Net reclassification improvement index
Integrated discrimination improvement index
Time-dependent receiver operating characteristic
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We thank the patients and their family members for supporting our study.
This study was supported by the Construction Project of Fujian Province Minimally Invasive Medical Center (Grant number: 171) and Natural Science Foundation of Fujian Province (Grant number: 2020J011030).
Ethics approval and consent to participate
This study was subject to approval by the Institutional Review Board of Fujian Medical University Union Hospital. All procedures performed in this study (involving human participants) were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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The authors declare that they have no competing interests.
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The optimal cut-off value of the index in association with overall survival was determined by the X-tile software. (A) advanced lung cancer inflammation index (B) prognostic nutritional index (C) systemic inflammation index.
Time-dependent ROC curves for ALI, PNI and SII in patients with right-sided colon cancer. (A) overall survival (B) disease-free survival.
Kaplan-Meier survival analysis according to ALI status in patients with right sided colon cancer. (A) overall survival of patients without propensity matching patients (B) disease-free survival of patients without propensity matching.
COX regression analysis of risk factors for overall survival of right-sided colon cancer patients before propensity score match.
COX regression analysis of risk factors for disease-free survival of right-sided colon cancer patients before propensity score match.
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Deng, Y., Sun, Y., Lin, Y. et al. Clinical implication of the advanced lung cancer inflammation index in patients with right-sided colon cancer after complete mesocolic excision: a propensity score-matched analysis. World J Surg Onc 20, 246 (2022). https://doi.org/10.1186/s12957-022-02712-0
- Advanced lung cancer inflammation index
- Right-sided colon cancer
- Postoperative complications
- Propensity score-matched