Influence of pre-operative sarcopenia on post-operative hepatic steatosis after pancreaticoduodenectomy for pancreatic ductal adenocarcinoma
Highlight box
Key findings
• Pre-operative sarcopenia had no significant impact on liver density attenuation.
What is known and what is new?
• The relation between sarcopenia and hepatic steatosis is well established.
• Pre-operative sarcopenia had no significant impact on liver density attenuation before and after pancreatic surgery.
What is the implication, and what should change now?
• Lower age and higher body mass index are associated with post-pancreaticoduodenectomy hepatic steatosis in patients with pancreatic ductal adenocarcinoma and should be considered when evaluating patients at risk of hepatic steatosis.
Introduction
Background
Non-alcoholic fatty liver disease (NAFLD) is the leading cause of chronic hepatopathy in France, with a prevalence of approximately 18% (1). It can lead to non-alcoholic steatohepatitis (NASH), characterized by inflammation, and in extreme cases to cirrhosis and hepatocarcinoma. Given its prevalence and complications, NAFLD represents a major public health concern and warrants attention for prevention and management. Pancreatic ductal adenocarcinoma (PDAC) is a growing concern, with incidence rates rising by 1.5 % for men and 2.1% for women each year in France (2). It is now the 6th cancer-related cause of death worldwide, despite being the 12th most common cancer globally (3). Pancreaticoduodenectomy (PD) remains the only curative surgical option for PDAC of the pancreatic head. PD has been associated with de novo post-operative NAFLD, in part due to exocrine and endocrine pancreatic insufficiency (4-7). A higher pre-operative body mass index (BMI) has also been shown to be a risk factor for post-operative hepatic steatosis (8). The European Working Group on Sarcopenia in Older People (EWGSOP) has defined sarcopenia as a “progressive and general loss of skeletal muscle mass and strength, causing adverse effects such as a poor quality of life, physical insufficiency and higher mortality”. Sarcopenia is highly prevalent amongst oncology patients (9). Although numerous studies have demonstrated the link between sarcopenia and NAFLD, primarily through mechanisms such as chronic systemic inflammation or insulin deficiency, the causal relationship between the two remains uncertain (10-12).
Rationale and knowledge gap
To our knowledge, this is the first study focusing on this relationship in patients undergoing PD for PDAC.
Objective
The primary objective of this study is to determine whether pre-operative sarcopenia had an impact on liver density attenuation within first 6 months after PD for PDAC. The secondary objectives were: (I) to identify pre-operative risk factors for hepatic steatosis; and (II) to evaluate the impact of sarcopenia and liver steatosis on survival after PD for PDAC. We present this article in accordance with the STROBE reporting checklist (available at https://jgo.amegroups.com/article/view/10.21037/jgo-24-700/rc).
Methods
Study population
All patients who underwent PD for PDAC between 2011 and 2020 in Lille University Hospital in France were retrospectively included. Inclusion criteria included: age ≥18 years, open approach, and curative resection. Exclusion criteria consisted of: PD for other diagnoses than PDAC, other pancreatic resections, palliative derivation without resection, age <18 years, and the lack of data. The study complied with French National Health guidelines on research involving human subjects. The study was conducted in accordance with the Declaration of Helsinki and its subsequent amendments, and has been approved by the ethics board of Lille University Hospital (No. DEC24-086). The patients’ consent was not collectible given the retrospective interventional design. A derogation has been obtained.
Data collection
Preoperative clinical data were collected including age, sex, comorbidities according to Charlson comorbidity index (CCI) [stratified into two groups (CCI =0–2 and CCI ≥3)], American Society of Anesthesiologists (ASA) score, nutritional markers (albumin, pre-albumin, preoperative weight, weight loss between healthy weight and preoperative weight, undernutrition grade) and biliary drainage before surgery. Complications at 3 months postoperatively were collected and rated according to the Clavien-Dindo classification (13), with severe complications defined by a grade ≥3. Postoperative pancreatic fistula was defined according to the International Study Group of Pancreatic Fistula (ISGPF) and classified into grades B or C (14). Bleeding and postoperative gastroparesis were graded according to the international consensus (15), and length of stay (LOS) was also assessed. Operative mortality was defined as death within 90 days of PD. The living status of all patients was verified using the Institut National de Statistiques et des Etudes Economiques (INSEE) database (16).
Outcome measurements
Sarcopenia was measured using the Skeletal Muscle Index (SMI), which consists of the entire muscle surface on a L2–3 computed tomography (CT) scan cross-section (Figure 1), in cm2, divided by the square height of the patient in m2. To define sarcopenia, we used the cut-offs reported by Mourtzakis et al. of 38.9 cm2/m2 for women and 55.4 cm2/m2 for men (17). Hepatic steatosis was measured using a mean of 5 regions of interest (ROI) in the liver parenchyma, on a non-injected CT scan section (Figure 2). A measure below the cut-off of 40 Hounsfield units (HU) was used to define hepatic steatosis (18). Preoperative SMI and hepatic steatosis were assessed on the most recent preoperative CT scan using the MYRIAN software and were measured within 6 months after PD and after 6 months.
Statistical analysis
Qualitative variables were described in terms of frequencies and percentages. Quantitative variables were described by the mean and standard deviation or by the median and interquartile range in cases of non-Gaussian distribution. The normality of the distributions was graphically checked and using the Shapiro-Wilk test. Patient survival was estimated using the Kaplan-Meier method. Patient characteristics and preoperative data were compared between patients with sarcopenia and those without using the Chi-squared test (or Fisher’s exact test when the expected count was <5) for qualitative variables, and using the Student’s t-test (or Mann-Whitney U test in cases of non-Gaussian distribution) for quantitative variables. The association between sarcopenia status and the change in liver density 6 months postoperatively was analysed using a mixed linear model (covariance pattern, with a compound symmetry covariance matrix) on liver density values, including a time effect in the model (6 months vs. preoperative), sarcopenia status, and the interaction term between sarcopenia status and time. The mean difference in liver density variation 6 months postoperatively according to sarcopenia status was estimated from the interaction term. The model was adjusted for sex and preoperative liver density (including an interaction term with time). The normality of the model’s residuals was verified. The association between sarcopenia status and different postoperative criteria was assessed using a logistic regression model for binary outcomes, a one-way analysis of variance (ANOVA) for quantitative outcomes, and a Cox proportional hazards model for survival. Effect sizes and their 95% confidence intervals (CIs) were derived from the models [odds ratios (ORs) for binary outcomes, mean differences for quantitative outcomes, and hazard ratios for survival]. A sensitivity analysis adjusted for sex, CCI (categorized: 0+1+2 vs. 3+4 vs. >4), age, and BMI was performed for the primary outcome of liver density. The identification of risk factors for hepatic steatosis within 6 months postoperatively was conducted using univariate and multivariate logistic regression models. ORs and their 95% CIs were derived from the models as a measure of effect size. Factors with a P value <0.20 in the univariate analysis were included in the multivariate logistic regression model. The association between hepatic steatosis within 6 months postoperatively and patient survival was assessed using a Cox proportional hazards model, with the origin date set as the date 6 months postoperatively (landmark at 6 months). The association between preoperative SMI and patient survival was also assessed using a Cox proportional hazards model. Hazard ratios and their 95% CIs were derived from both models as a measure of effect size. We designed a scatter plot to study the correlation between 1–6 months SMI and liver density. No statistical comparison was made for qualitative variables with a sample size <8. The significance level was set at 5%. Statistical analyses were performed using the SAS software (SAS Institute version 9.4).
Results
A total of 185 patients who underwent PD for PDAC were identified. After exclusion of patients with missing data (n=71), unclear pathological diagnosis (n=2), extended resection (n=2) and another tumor localization (n=1), 109 patients were included.
Patient characteristics
Demographic data are detailed in Table 1. The mean age of patients was 64.5 years, with a majority being male. With regards to comorbidities, 60 patients (55%) had a CCI ≥3. Overall, 61% of patients had sarcopenia and the mean pre-operative SMI was 46.48 cm2/m2. Hepatic steatosis was present in 36% of patients at 1–6 months.
Table 1
| Variable | N | All patients | Sarcopenia | ||
|---|---|---|---|---|---|
| No (n=43) | Yes (n=66) | P value | |||
| Age (years) | 109 | 64.5±9.7 | 66.8±8 | 63.1±10.4 | 0.045 |
| Sex ratio (M/F) | 109 | 1.27 | 0.65 | 2 | 0.005 |
| ASA score | 2.09±0.67 | ||||
| ASA 1–2 | 109 | 84 [77] | 32 [74] | 52 [79] | 0.6 |
| ASA 3–4 | 109 | 25 [23] | 11 [26] | 14 [21] | |
| Charlson score | 109 | 2.84±2.58 | |||
| 0–2 | 49 [45] | 13 [30] | 36 [55] | 0.01 | |
| ≥3 | 60 [55] | 30 [70] | 30 [45] | ||
| Comorbidities | |||||
| High blood pressure | 108 | 42 [39] | 21 [49] | 21 [32] | 0.059 |
| Ischemic heart disease | 108 | 13 [12] | 4 [9] | 9 [14] | 0.52 |
| Heart failure | 108 | 2 [2] | 1 [2] | 1 [2] | |
| Kidney failure | 108 | 2 [2] | 2 [5] | 0 [0] | |
| COPD | 109 | 5 [5] | 4 [9] | 1 [2] | |
| Chronic pancreatitis | 109 | 5 [5] | 2 [5] | 3 [5] | |
| Diabetes | 109 | 31 [28] | 12 [28] | 19 [29] | 0.92 |
| Cirrhosis | 102 | 1 [1] | 1 [2] | 0 [0] | |
| Nutritional markers | |||||
| Albumin (g/L) | 104 | 37.37±5.43 | 37.83±5.25 | 37.08±5.56 | 0.49 |
| Pre-albumin (g/L) | 79 | 0.2±0.07 | 0.2±0.06 | 0.2±0.07 | 0.98 |
| Pre-operative BMI (kg/m2) | 109 | 25.32±4.93 | 27.02±5.52 | 24.22±4.19 | 0.006 |
| SMI (cm2/m2) | |||||
| Pre-operative | 108 | 46.48±10.71 | 53.45±10.23 | 41.86±8.3 | <0.001 |
| 1–6 months | 109 | 34.61±6.92 | 36.74±7.67 | 33.23±6.04 | |
| >6 months | 88 | 36.57±7.76 | 37.58±8.24 | 35.87±6.86 | |
| Liver density (HU) | |||||
| 1–6 months | 109 | 38.16±23.79 | 37.77±23.69 | 38.41±24.03 | |
| >6 months | 89 | 41.14±25.47 | 43.63±24.32 | 39.46±26.32 | |
| Hepatic steatosis | |||||
| Pre-operative | 108 | 11 [10] | 3 [7] | 8 [12] | 0.52 |
| 1–6 months | 108 | 39 [36] | 13 [30] | 26 [39] | |
| >6 months | 89 | 26 [29] | 9 [21] | 17 [32] | |
| Post operative complications | |||||
| Clavien-Dindo ≥3 | 109 | 20 [18] | 10 [23] | 10 [15] | |
| Anatomopathology | 0.42 | ||||
| pT1–2 | 106 | 48 [45] | 17 [40] | 31 [47] | |
| pT3–4 | 106 | 58 [55] | 25 [60] | 33 [50] | |
| Chemotherapy | |||||
| Neoadjuvant chemotherapy | 109 | 36 [33] | 15 [35] | 21 [32] | |
| Adjuvant chemotherapy | 107 | 94 [88] | 33 [77] | 61 [92] | |
| Death | |||||
| 1 year | 109 | 16 [15] | 6 [14] | 10 [15] | |
| 3 years | 109 | 69 [63] | 30 [70] | 39 [59] | |
Data are presented as n [%] or mean ± SD unless otherwise specified. ASA, American Society of Anesthesiologists; BMI, body mass index; COPD, chronic obstructive pulmonary disease; F, female; HU, Hounsfield unit; M, male; SD, standard deviation; SMI, skeletal muscle index.
Comparison between sarcopenic and non-sarcopenic patients
Non-sarcopenic patients were significantly older (66.8 vs. 63.1 years, P=0.045) and had a significantly lower male to female ratio (M/F) (0.65 vs. 2, P=0.005) compared to sarcopenic patients. Regarding comorbidities, there were more patients in the non-sarcopenic group with a CCI ≥3 (P=0.01). Moreover, the pre-operative BMI was significantly higher (P=0.006) in the non-sarcopenic group (27.02 kg/m2) compared to the sarcopenic group (24.22 kg/m2) (Table 1).
Correlation between sarcopenia and hepatic steatosis
No significant difference (P=0.97) was found between non-sarcopenic and sarcopenic patients regarding liver density attenuation after PD for PDAC after adjusting the analysis for patient’s sex. The mean preoperative liver density was 52.98 HU in the non-sarcopenic group and 52.04 HU in the sarcopenic group. Liver density decreased to 37.77 in non-sarcopenic patients and 38.40 in sarcopenic patients after surgery (Figures 3,4). This result was similar after adjusting for sex, CCI, age and preoperative BMI (P=0.20). Preoperative sarcopenia did not impact hepatic steatosis after 6 months (OR 1.42, 95% CI: 0.55–3.67, P=0.52), administration of adjuvant chemotherapy (OR 2.96, 95% CI: 0.89–9.77, P=0.07), and Clavien-Dindo 3 and 4 complications (OR 0.59, 95% CI: 0.22–1.56, P=0.29).
Risk factors for hepatic steatosis after PD for PDAC
We performed a univariate and multivariate analysis to assess for risk factors of hepatic steatosis within 6 months after PD (Tables 2,3). In the univariate analysis, a lower age was significantly associated with the occurrence of hepatic steatosis. As shown in Table 2, increased age was significantly associated with decreased liver steatosis after PD for PDAC (OR 0.57, P=0.01, 95% CI: 0.37–0.84). This tendency was confirmed in the multivariate analysis (Table 3). Additionally, the multivariate analysis showed that preoperative BMI was significantly associated with postoperative liver steatosis (OR 1.62, P=0.04, 95% CI: 1.02–2.57).
Table 2
| Variable | OR | 95% CI | P value |
|---|---|---|---|
| Denutrition Grade 1 | 0.91 | 0.36–2.32 | 0.84 |
| Denutrition Grade 2 | 0.73 | 0.25–2.10 | 0.84 |
| Pre-operative biliary drainage | 1.44 | 0.64–3.24 | 0.38 |
| Neo-adjuvant chemotherapy | 0.50 | 0.20–1.21 | 0.12 |
| Age | 0.57 | 0.37–0.84 | 0.01 |
| Pre-operative BMI | 1.43 | 0.94–2.16 | 0.08 |
| Pre-operative albumin level | 0.96 | 0.64–1.43 | 0.84 |
| Pre-operative prealbumin level | 1.04 | 0.63–1.70 | 0.88 |
BMI, body mass index; CI, confidence interval; OR, odds ratio.
Table 3
| Variable | OR | 95% CI | P value |
|---|---|---|---|
| Neoadjuvant chemotherapy | 0.58 | 0.22–1.53 | 0.27 |
| Age | 0.57 | 0.36–0.89 | 0.01 |
| Pre-operative BMI | 1.62 | 1.02–2.57 | 0.04 |
BMI, body mass index; CI, confidence interval; OR, odds ratio.
Impact of sarcopenia and hepatic steatosis on survival after PD for PDAC
No significant difference was shown between non-sarcopenic and sarcopenic patients in terms of 3-year survival (P=0.54). Furthermore, hepatic steatosis within 6 months after PD for PDAC had no impact on survival (P=0.90).
Discussion
To our knowledge, this study is the first to assess the correlation between preoperative sarcopenia and postoperative hepatic steatosis in the context of pancreatic surgery. Similarly to previous studies, 36.1% of patients had hepatic steatosis (19) and 61% had sarcopenia (20). Our analysis showed no significant difference in terms of hepatic density attenuation between non-sarcopenic and sarcopenic patients (P=0.97), while previous studies reported a correlation between sarcopenia and NAFLD (11). This could be explained by the fact that physiological and physical changes induced by PD may mask the effects of pre-operative sarcopenia on hepatic steatosis. Physiological mechanisms of sarcopenia and hepatic steatosis should be further explored to determine the risk factors for these two conditions.
Our results revealed no significant difference in 3 years survival between non-sarcopenic and sarcopenic or between steatosis and no steatosis groups (Figures 5,6). Previous research has suggested a poorer prognosis for patients with postoperative hepatic steatosis or pre-operative sarcopenia (20,21). Our results could be explained by a limited sample size, resulting in insufficient statistical power. Conducting a multicentric study could help to address this limitation and provide more robust conclusions on the survival outcomes.
Similarly to previous studies, our multivariate analysis revealed that BMI was significantly higher in patients with post-operative steatosis. Patel et al. (4) showed, in an analysis of 136 patients, an OR of 1.19 (95% CI: 1.02–1.4, P=0.03) for the occurrence of hepatic steatosis following PD. BMI was also an independent risk factor for hepatic steatosis after total PD in Kato et al.’s study (8), a retrospective multicentric study of 148 patients. Similarly, Sato et al. found a significantly higher BMI in 120 patients with steatosis after PD (22). The multivariate analysis also showed that decreasing age was significantly associated with the occurrence of post-operative steatosis after PD for PDAC. To our knowledge, no study has previously reported this postoperative finding. A higher age is considered as a risk factor for the occurrence of hepatic steatosis after pancreatectomy in previous publications (23). Further research is needed to elucidate this correlation.
The present study has some limitations. First, the retrospective nature may be a source of potential bias. Second, data about exocrine and endocrine pancreatic insufficiencies were not available, although they may contribute in the occurrence of liver steatosis (8,19,21,24). Third, the definition of sarcopenia and liver steatosis was only focused on imaging data, making these measures very restrictive. Indeed, other methods to measure muscle mass such as BMI or dual energy X-ray absorptiometry (DXA), are more precise, but given the retrospective nature of this study and the lack of access to this data, we chose to use SMI to measure muscle mass. Other strategies, such as MRI or liver biopsy, could be considered (19,25). Finally, all patients in this study were treated in the same center, which limits the external validity of our findings.
Conclusions
No correlation was found between pre-operative sarcopenia and liver density attenuation after PD for PDAC. Further investigations are needed to clarify these findings, and a prospective multicentric study would be beneficial to standardize data collection and enhance the robustness of these results.
Acknowledgments
None.
Footnote
Reporting Checklist: The authors have completed the STROBE reporting checklist. Available at https://jgo.amegroups.com/article/view/10.21037/jgo-24-700/rc
Data Sharing Statement: Available at https://jgo.amegroups.com/article/view/10.21037/jgo-24-700/dss
Peer Review File: Available at https://jgo.amegroups.com/article/view/10.21037/jgo-24-700/prf
Funding: None.
Conflicts of Interest: All authors have completed the ICMJE uniform disclosure form (available at https://jgo.amegroups.com/article/view/10.21037/jgo-24-700/coif). The authors have no conflicts of interest to declare.
Ethical Statement: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. The study was conducted in accordance with the Declaration of Helsinki and its subsequent amendments, and has been approved by the ethics board of Lille University Hospital (No. DEC24-086). The patients’ consent was not collectible given the retrospective interventional design. A derogation has been obtained.
Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0/.
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