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Maxillofacial Plastic and Reconstructive Surgery
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Impact of skeletal muscle mass on postoperative complications in oral cancer surgery

Maxillofacial Plastic and Reconstructive Surgery volume 46, Article number: 12 (2024) Cite this article

Abstract

Background

Sarcopenia is characterized by a progressive and generalized loss of skeletal muscle mass and strength. The aim of this retrospective study was to investigate the impact of skeletal muscle mass on adverse events in free-flap reconstruction for defects after oral cancer resection.

Results

Of 120 patients, recipient-site adverse events occurred in 56 patients (46.7%), and recipient-site surgical site infections occurred in 45 patients (37.5%). Skeletal muscle index was significantly associated with recipient-site adverse events in univariate analysis (P < 0.05). Lower body mass index and skeletal muscle index were significantly associated with recipient-site surgical site infection in univariate analysis (P < 0.05). In the multiple logistic regression model, a lower skeletal muscle index was a significant risk factor for recipient-site adverse events and surgical site infections (adverse events odds ratio; 3.17/P = 0.04; surgical site infection odds ratio; 3.76/P = 0.02).

Conclusions

The SMI at level Th12 was an independent factor for postoperative AEs, especially SSI, in OSCC patients with free-flap reconstruction.

Background

This study was performed to investigate the association between skeletal muscle mass and predictors of postoperative adverse events (AEs) in patients with oral squamous cell carcinoma (OSCC) who underwent free-flap reconstruction. Sarcopenia is a disease characterized by a progressive and generalized loss of skeletal muscle mass and strength, and a low skeletal muscle index (SMI) is a clinical assessment method of the disorder [1,2,3]. Previous studies have shown that a low SMI in patients with a variety of malignancies such as liver, lung, bladder, colorectal, and breast cancer, as well as head and neck cancer (HNC), results in more postoperative complications, more severe chemotherapy toxicity, and a lower survival rate than in those without a low SMI [3,4,5,6,7,8,9,10,11,12]. The incidence of AEs in patients undergoing free-flap reconstruction for HNC is higher and making early prevention and treatment important [13]. Moreover, prioritizing the early prevention and treatment of AEs is crucial as they influence the timing of initiating postoperative therapy. Predictors of AEs include age, sex, body mass index (BMI), performance status (PS), comorbidities, and recurrence; however, there is no standardized list.

Skeletal muscle measurement using computed tomography (CT) images at the L3 vertebral level has been widely used to evaluate low SMI in patients undergoing routine abdominal CT [14], but for patients with oral squamous cell carcinoma (OSCC), a limitation was posed in the applicability of assessing low SMI by evaluation at the L3 level. Swartz et al. found a strong correlation between the cross-sectional area (CSA) of muscles at the L3 and third cervical vertebra (C3) levels and reported that the assessment of skeletal muscle mass on head and neck CT is feasible [15]. Matsuyama et al. suggested that the assessment of the skeletal muscle area of the C3 level on CT in patients with HNC may be impaired by tumor invasion or lymphadenopathies and found a strong correlation between muscle CSA at L3 and that at the 12th thoracic spine (Th12) level [16]. No studies have evaluated the impact of muscle mass on patients with AEs using thoracic spine level images in OSCC. This study therefore aims to investigate such association by assessing the correlation between AEs and muscle mass assessed at the Th12 level in patients affected by OSCC.

Methods

Study setting and participants

This retrospective single-center cohort study was approved by the Ethical Review Committee of Tokyo Dental College Ichikawa General Hospital (approval ID: I 20–51). Clinical records were retrieved concerning 131 patients diagnosed with stages II–IV primary OSCC (according to the 7th edition of the American Joint Committee on Cancer [AJCC] staging manual) who underwent reconstructive surgery with a free flap (forearm flap, rectus abdominis muscle flap, anterolateral thigh flap, and fibular flap) at the Oral Cancer Center, Tokyo Dental College, between April 2014 and March 2019. Of these, those concerning two patients were excluded because their Th12 could not be measured, and data concerning further three patients were excluded because they did not undergo neck dissection. Therefore, clinical data assessed for this retrospective cohort study concerned 120 patients (85 men and 35 women).

Data collection

Data collected from clinical records were age, sex, height, weight, BMI, tumor localization, TNM classification, SMI, American Society of Anesthesiologists physical status (ASA-PS) classification, smoking history, drinking status, the presence of diabetes mellitus, and preoperative laboratory data (hemoglobin, albumin, leukocytes, platelets, and C-reactive protein). Intraoperative factors, including the site of free flap harvest (anterolateral thigh, fibula, forearm, and others), operation time, blood loss, neck dissection method, and reconstruction method, were also recorded. Surgery-related complications were defined as those occurring within 30 days after the procedure, and all postoperative AEs were scored according to the Clavien–Dindo classification of surgical complications [17]. For each cut-off value, poor PS was defined as ASA-PS > 2 [18]. A BMI of < 18.5 kg/m2 was defined as underweight based on the definition of the Japan Society for the Study of Obesity (JASSO) [19].

Image analysis

Axial CT images at the Th12 level of a cervicothoracic CT scan performed prior to the treatment for malignancy were used to measure the muscle CSA. The CSA measurement method used was that described by Matsuyama et al. [16]. CT images were scrolled from caudal to cephalic, and the Th12 CT slice with the clearest view of the costal process was selected [16]. Contrast agents (barium and iodine) commonly administered during normal CT scans have been reported to not interfere with the evaluation of skeletal muscle and abdominal adipose tissue [20]; thus, they were used to obtain contrast-enhanced CT images. The CSA of the muscles at Th12 was measured using the Vincent software (version 6, FUJIFILM Corp., Tokyo, Japan). One trained researcher (A. F.) performed all of the image analyses. CSA was measured semiautomatically and independently, and the values obtained from the two measurements were averaged and used in this study. For the measurement of skeletal muscle area, the magnification of the images, CT value threshold adjustment, and calculation of measurements were performed automatically by the software. The skeletal muscles were examined visually for anatomical features and manually traced. Skeletal muscles were identified using the standard Hounsfield unit in the range of − 29 to + 150 [16, 21]. The CSA of the delineated area was automatically calculated as the sum of the delineated pixels and was quantitatively evaluated. At the Th12 level slice, all muscles of the trunk wall, in addition to the erector muscles of the spine, were included (Fig. 1a, b). Subsequently, the skeletal muscle CSA at level L3 was estimated using the prediction rule described by Matsuyama et al. (Eq. (1)) [17]: the estimated skeletal muscle CSA at L3 was normalized for height by dividing it by the squared height: lumbar skeletal muscle index (L3SMI: lumbar 3 SMI, cm2/m2) (Eq. (2)). The optimal cut-off value for L3SMI was reported by Ohashi et al. [22] (men: 45.471 cm2/m2, women: 35.170 cm2/m2). This cut-off value correlated with the value from DXA, which is used to diagnose low skeletal muscle mass as defined by the Asian Working Group for Sarcopenia (AWGS) [23].

Fig. 1
figure 1

a The original CT image at Th12 transferred in the DICOM format. b The tissue HU threshold was set from − 29 to + 150 HU for skeletal muscle. The skeletal muscle was calculated by excluding the abdominal viscera and Th12

Full size image

Equation 1 is as follows:

$$\mathrm{CSA\ at\ L}3\mathrm{\ level\ }({{\text{cm}}}^{2}) = 14.143 + 0.779 \times \mathrm{ CSA\ at\ Th}12\ ({{\text{cm}}}^{2})-0.212 \times \mathrm{ age\ }({\text{y}}) + 0.502 \times \mathrm{ weight\ }({\text{kg}}) + 13.763 \times \mathrm{ sex\ }({\text{women}}: 1,\mathrm{ men}: 2)$$
(1)

Equation 2 is as follows:

$${\text{L}}3\mathrm{SMI }=\mathrm{ L}3\mathrm{CSA }\times 1/(\mathrm{height }[{{\text{m}}}^{2}]).$$
(2)

Statistical analysis

Data were summarized by means of descriptive statistics, that is by calculating the mean ± standard deviation (SD) or median (range) for continuous variables and reporting frequencies or calculating percentages (%) for categorical ones. As normality of continuous variables was rejected when they were assessed using the Kolmogorov–Smirnov test, differences in their distribution were investigated respectively by means of the Mann–Whitney test. Those of categorical ones were assessed using the χ2 test. To investigate the correlation between AEs and SMI, and to identify other independent risk factors associated with the occurrence of AEs in OSCC patients, data were assessed by means of univariate and multivariate analyses. The covariates used in the multivariate analysis were selected based on previous reports, so this study did not investigate the association between tumor stage and AEs. Multivariate analysis was performed using logistic regression analysis. All tests were two sided, and a P-value < 0.05 was considered statistically significant. All statistical analyses were performed using EZR software (64 bit) [24].

Results

The characteristics of these 120 patients are presented in Table 1. The patients were aged 20–86 years, with a median age (interquartile range of 60 years; 85 were men, and 35 were women). According to the Union for International Cancer Control, the clinical stages were stage II in 15 cases, stage III in 15 cases, and stage IV in 90 cases. The primary tumor site was the tongue in 69 patients (57.5%), followed by the mandible in 26 (21.7%), floor of the mouth in 15 (12.5%), and buccal mucosa in 10 (8.3%).

Table 1 Patient characteristics
Full size table

The mean values ± standard deviation of SMIs were 47.1 ± 8.1 (range: 28.0–69.1) cm2/m2 in all patients, 50.7 ± 6.4 cm2/m2 (range: 36.3–69.1) in men, and 38.9 ± 5.1 cm2/m2 (range: 28.0–57.3) in women.

AEs occurred in 57 (47.5%) patients. In univariate analysis, AEs were significantly associated with a lower SMI (Table 2). Multivariate analysis was conducted for factors considered to be associated with AEs, and lower SMI (odds ratio [OR] = 3.17, P = 0.04) and sex differences (OR = 2.45, P = 0.04) emerged as independent significant factors (Table 3). SSIs at the recipient site were observed in 45 patients (37.5%). In the univariate analysis, recipient-site SSI was significantly associated with lower BMI and SMI (Table 4). Multivariate analysis was performed for factors considered to be associated with SSI, and lower SMI (OR = 3.76, P = 0.02), sex difference (OR = 3.22, P = 0.01), and ACE27 (OR = 2.80, P = 0.03) emerged as independent significant factors (Table 5).

Table 2 Preoperative variables of patients who underwent oral cancer resection with flap reconstruction and did and did not have recipient-site surgical site infection (SSI)
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Table 3 Significant risk factors for adverse events identified in multiple logistic regression analysis
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Table 4 Perioperative variables of patients who underwent oral cancer resection with flap reconstruction and did and did not have recipient-site surgical site infection
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Table 5 Significant risk factors for recipient-site surgical site infection identified using multiple logistic regression analysis
Full size table

Discussion

There are currently no reports examining muscle mass using thoracic spine level images in patients with OSCC, and, to our knowledge, this is the first study to demonstrate the association of AEs and SSIs with Th12 SMI.

Although the evaluation of skeletal muscle area at the C3 level on CT in patients with OSCC is common, in our study, there were many inter-rater errors, and more patients were excluded than in the Th12 measurement group owing to the influence of the imaging axis.

SSI is defined by the Centers for Disease Control and Prevention as a wound infection that occurs within 30 days of an operative procedure. The incidence of postoperative AE, especially SSI, is high after oral cancer surgery because patients probably have poor nutrition prior to surgery, a dead space is likely to form anatomically, and the wound is exposed to saliva and fluid retained in the oral cavity [18, 25,26,27,28,29,30,31,32]. Therefore, it is important to control the risk of AEs before surgery.

To date, hypoalbuminemia, long surgical time, and high ASA scores have been reported as risk factors for SSI after oral cancer surgery [15, 25,26,27,28,29,30,31,32]. In this study, a decrease in muscle mass, which is closely related to a low SMI, was shown to be a risk factor for SSI after oral cancer surgery. However, no significant associations were observed for hypoalbuminemia and long surgical time. The reason for this is that the The European Society of Parenteral and Enteral Nutrition guidelines recommend postponing surgery if the serum albumin level is less than 3.0 g/dl [33]. In the present study, there was only one patient with a serum albumin level of less than 3.0 g/dl, which was presumably insufficient for a statistical study. In addition, the surgical time suggested to be associated with AEs (especially flap complications) is > 10 h [34]. In this study, flap necrosis occurred in 16 patients, and the mean operative time was 12 h 31 min. The mean operative time for patients without necrosis was 16 h 22 min. In a study on lung cancer, PS ≥ 2 was associated with poor overall survival [35, 36]. Similarly, in our study, PS was a predictor of prognosis, which is a reasonable finding.

The results of this study suggest that the female sex could be a risk factor for SSI. Recently, skeletal muscle was identified as an organ that secretes myokines that may influence the growth of cancer cells [37]. Hojman et al. reported that myokines, which are released from muscles during exercise, inhibit the growth of breast cancer cells and induce apoptosis of these cells [38]. Therefore, as muscle mass decreases, myokine levels and responses may also decrease, making it easier for cancer to progress.

In our study, univariate analysis results demonstrated that BMI was not statistically significantly different from postoperative AEs. Notably, conventional nutritional assessments do not reliably detect skeletal muscle loss [39]. BMI alone makes it difficult to distinguish between fat and fat-free mass [40], presumably because weight loss cannot differentiate between adipose tissue and muscle loss.

This study has some limitations. As it was conducted at a single center, the presence of an unmeasured bias cannot be ruled out. According to the Asian Working Group for Sarcopenia (AWGS) guidelines, the diagnosis of low SMI requires low muscle strength or low physical performance in addition to low muscle mass. The present study did not consider muscle strength, as its measurements were not available in the clinical records being assessed. A further limitation is operative in nature: as the the AWGS has not proposed clear SMI cut-off values for Th12, the one used in the present study is not standardized, as in previous studies concerning SMI. However, such skeletal muscle mass measurement might still be an additional useful predictor of postoperative AEs, especially when used in conjunction with those already assessed in the clinical setting. Other limitations of the present study include the selection of covariates — not including, for example, the tumor stage, as well as those stemming from it being retrospective. To address these limitations, it is suggested that future studies employ more comprehensive analyses that include more covariates and a prospective study design. In addition, larger validation studies and clinical trials with different patient populations should be conducted to confirm preliminary findings. This would further solidify the results of this study and confirm the utility of the proposed predictors.

Conclusions

The SMI at the Th12 level was an independent factor for postoperative AEs, especially SSI, in OSCC patients with free-flap reconstruction, suggesting this might be a useful predictive factor for AEs in the clinical setting. Such results though are preliminary, and prospective studies on a greater number of subjects should be warranted to further investigate such clinically relevant matter.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

AE:

Adverse events

AJCC:

American Joint Committee on Cancer

ASA-PS:

American Society of Anesthesiologists physical status

AWGS:

Asian Working Group for Sarcopenia

BMI:

Body mass index

CSA:

Cross-sectional area

CT:

Computed tomography

DXA:

Dual-energy X-ray absorptiometry

HNC:

Head and neck cancer

OR:

Odds ratio

OSCC:

Oral squamous cell carcinoma

PNI:

Prognostic nutritional index

PS:

Performance status

SD:

Standard deviation

SMI:

Skeletal muscle index

SSI:

Surgical site infection

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Acknowledgements

We would like to extend our deepest gratitude to the medical staff of the Department of Oral Medicine and Hospital Dentistry and the Department of Oral Oncology, Oral and Maxillofacial Surgery.

Funding

The authors did not receive financial support from any organization for the submitted work.

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Authors and Affiliations

  1. Department of Oral Pathobiological Science and Surgery, Tokyo Dental College, Tokyo, 101-0061, Japan

    Arisa Fujii, Keisuke Sugahara & Akira Katakura

  2. Department of Oral Oncology, Oral and Maxillofacial Surgery, Tokyo Dental College, Chiba, 272-8513, Japan

    Taiki Suzuki & Takeshi Nomura

  3. Department of Oral Medicine and Hospital Dentistry, Tokyo Dental College, Chiba, 272-8513, Japan

    Katsuhiko Sakai & Nobuyuki Matsuura

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Contributions

AF participated in the design and coordination of the study. TS and KS were responsible for data collection and analysis. KS, NM, and TN were involved in the drafting of the manuscript. AK was involved in the study design and correction of the manuscript, as well as study coordination. All authors read and approved the final manuscript.

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Correspondence to Akira Katakura.

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The study design was approved by the Ethical Review Committee of Tokyo Dental College Ichikawa General Hospital (approval ID I 20–51).

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The authors declare that they have no competing interests.

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Fujii, A., Suzuki, T., Sakai, K. et al. Impact of skeletal muscle mass on postoperative complications in oral cancer surgery. Maxillofac Plast Reconstr Surg 46, 12 (2024). https://doi.org/10.1186/s40902-024-00417-w

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