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Research ArticleClinical Studies

Change in PMI During Neoadjuvant Therapy Is a Predictive Prognostic Marker in Rectal Cancer

TATSUNARI FUKUOKA, KIYOSHI MAEDA, HISASHI NAGAHARA, MASATSUNE SHIBUTANI, YASUHITO ISEKI, SHINJI MATSUTANI, KOSEI HIRAKAWA and MASAICHI OHIRA
Anticancer Research September 2019, 39 (9) 5157-5163; DOI: https://doi.org/10.21873/anticanres.13711
TATSUNARI FUKUOKA
1Department of Gastroenterological Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan
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KIYOSHI MAEDA
2Department of Gastroenterological Surgery, Osaka City General Hospital, Osaka, Japan
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  • For correspondence: m1378386@med.osaka-cu.ac.jp
HISASHI NAGAHARA
1Department of Gastroenterological Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan
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MASATSUNE SHIBUTANI
1Department of Gastroenterological Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan
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YASUHITO ISEKI
1Department of Gastroenterological Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan
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SHINJI MATSUTANI
1Department of Gastroenterological Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan
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KOSEI HIRAKAWA
1Department of Gastroenterological Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan
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MASAICHI OHIRA
1Department of Gastroenterological Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan
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Abstract

Background/Aim: Neoadjuvant therapy is often administered to patients with locally advanced rectal cancer (LARC). The aim of this study was to investigate the correlation between the change in the psoas muscle index (PMI) during neoadjuvant therapy and the prognosis of LARC patients. Patients and Methods: Forty-seven patients who underwent potentially curative surgery for LARC with neoadjuvant therapy were enrolled in this study. We evaluated the relationship between the prognosis and clinicopathological factors, including the prognostic value of a change in the PMI. Results: A >10% decrease in the PMI value was observed in 15 of the 47 patients. A >10% decrease in the PMI value was associated with shorter OS and RFS compared to patients who did not show a >10% decrease in their PMI. The decrease in PMI after neoadjuvant therapy was an independent negative prognostic factor for patients undergoing neoadjuvant therapy for LARC. Conclusion: A decrease in PMI after neoadjuvant therapy might predict a poor prognosis in LARC patients undergoing neoadjuvant therapy.

  • Psoas muscle index
  • rectal cancer
  • neoadjuvant therapy

Colorectal cancer (CRC) is the first most commonly diagnosed cancer in Japan. Rectal cancer (RC) is the seventh leading cause of cancer death, with approximately 46,000 new cases and nearly 15,000 deaths in Japan in 2014 (1). Recently, there have been remarkable advances in RC treatment. Neoadjuvant chemoradiotherapy (NACRT) has been established as the standard treatment for locally advanced RC in most parts of Europe and the United States (2, 3), while neoadjuvant chemotherapy without radiation (NAC) is a feasible treatment option for locally advanced RC (4). These treatments reduce local recurrence; however, they do not dramatically improve the overall survival (OS) rate. Some patients develop recurrent disease, even if they undergo combined therapy for RC. Furthermore, the indications for postoperative adjuvant chemotherapy remain controversial. Although the TNM classification and histological response are very important prognostic markers, they are not sufficient, and it is necessary to preoperatively predict recurrence and the prognosis after surgery in order to establish the indications for postoperative adjuvant therapy.

In previous studies, the nutritional status has been shown to affect perioperative surgical outcomes, such as complication rates. Furthermore, sarcopenia is associated with a poorer prognosis in patients with pancreatic cancer, gastric cancer, bladder cancer, and hepatocellular carcinoma (5-9). Miyamoto et al. have reported that a decrease in the skeletal muscle index due to the administration of chemotherapy was associated with a poor prognosis in patients with unresectable CRC (10).

The aim of this study was to investigate whether or not the change in the psoas muscle index (PMI; an index of the skeletal muscle mass) due to neoadjuvant therapy could be used to predict the prognosis of RC patients who receive neoadjuvant therapy.

Patients and Methods

We retrospectively reviewed the data of consecutive RC patients who underwent primary tumor resection after neoadjuvant therapy (NAC or NACRT) at Osaka City University from January 2010 to December 2016. We performed neoadjuvant therapy for patients with pathologically-confirmed rectal adenocarcinoma when the depth of tumor invasion was beyond the outer border of the proper muscle or lymph node involvement (cN+) was detected on computed tomography, according to National Comprehensive Cancer Network (NCCN) and previous reports (11, 12). The exclusion criteria for this study were distant metastasis and a history of malignancies other than RC. Regarding the neoadjuvant therapy regimen, the physician in charge selected NAC or NACRT with consideration of the preoperative diagnosis and background of the patient.

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Table I.

Clinicopathologic characteristics of 47 rectal cancer patients with neoadjuvant therapy.

Forty-seven patients who underwent potentially R0 surgery for locally advanced RC with NAC or NACRT were enrolled in the present study. Radiotherapy was performed once (1.8 or 2.0 Gy) daily to reach a total dose of 50.4 Gy. Capecitabine (825-900 mg/m2) was the only chemotherapy agent administered concurrently with RT. Capecitabine was simultaneously given with RT on weekdays, followed by a two-day rest interval on weekends. This cycle was repeated during irradiation. The chemotherapy agents that were administered for NAC were capecitabine + oxaliplatin (CapeOx), capecitabine + oxaliplatin + cetuximab (CapeOx + cetuximab), or modified FOLFOX6.

Figure 1.
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Figure 1.

Receiver operating characteristic curve analysis of the changing rate of PMI value. Area under the curve=0.621, 95% Confidence interval=0.438-0.805, p=0.213.

Resected specimens were pathologically classified according to the UICC TNM classification of malignant tumors, version 7 (13). Pathologists evaluated the tumor pathological response according to the Japanese definition (14): Grade 0, no response; Grade 1, necrosis and degeneration of cancer cells (<2/3 of tumor cells); Grade 2, significant degeneration, necrosis, fusion, disappearance in more than 2/3 tumor cells; and Grade 3, complete response, extensive degeneration and replacement by granulomatous or fibrous tissue. Postoperative complications were categorized according to the Clavien-Dindo Classification (CDC) (15). We performed adjuvant chemotherapy after the operation at the request of the physician. Oxaliplatin doublet chemotherapy was performed in 18 cases, while oral anticancer agents were provided only in 16 cases. We also followed the patients clinically to monitor the clinical outcomes. All patients underwent regular physical examinations and blood tests, and demographic, pathologic, and outcome data were collected for each patient. The median follow-up period of these patients was 24.1 months (range=4-85 months).

PMI. We performed computed tomography before and after neoadjuvant therapy in order to evaluate the effects of neoadjuvant therapy. We calculated the PMI (cm2/m2) before (pre-PMI) and after neoadjuvant therapy (post-PMI). The bilateral psoas muscle area (cm2)/2 was calculated at the level of the navel from computed tomography images by a single investigator who was blinded to the patient outcomes (5). To normalize the PMI for body size, the psoas muscle area was divided by the square of the body height (m2). We subtracted the pre-PMI from the post-PMI. These values were then divided by the pre-PMI and multiplied by 100 to determine the rate of change in the PMI.

Ethical considerations. This study was approved by the Osaka City University ethics committee. Informed consent was obtained from all patients.

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Table II.

Association between the extent of PMI and clinicopathological and surgical factors.

Statistical analysis. A receiver operating characteristic (ROC) curve was used to determine an appropriate cut-off value. All patients were classified into two groups according to the rate of PMI change. The χ2 test and Fisher's exact test were performed to determine the significance of differences in the rate of PMI change and the associated clinicopathological factors. Survival curves were constructed using the Kaplan–Meier method and compared using a log-rank test. The influence of each prognostic factor on the patient's survival was evaluated using a Cox regression analysis. p-Values of <0.05 were considered to indicate a statistically significant difference. All of the analyses were performed using the SPSS software program (SPSS Japan, Tokyo, Japan).

Results

The patient characteristics are presented in Table I. The study population included 35 men and 12 women, and median patient age at the time of the initial surgery was 66 years (range=27-88 years). The distribution of the location of tumor was as follows: upper rectum (n=3), middle rectum (n=9), and lower rectum (n=35). These three parts were defined from the anal verge as follows: lower rectum, 0 to 6 cm; middle rectum, 7 to 11 cm; upper rectum, 12 to 15 cm (16, 17). The chemotherapeutic responses were classified as follows: complete response (CR), n=0; partial response (PR), n=38; stable disease (SD), n=6; and progressive disease (PD), n=3, according to the response evaluation criteria in solid tumors (RESIST) (18). The response rate was 80.9%, and the disease control rate was 93.6%. Side effects of NAC or NACRT were estimated in accordance with the Common Terminology Criteria for AEs (CTCAE) v.4.0, Japanese Clinical Oncology Group (JCOG) version. Adverse events were leukopenia (grade 1, n=3; grade 2, n=4), thrombocytopenia (grade 1, n=4; grade 2, n=5), diarrhea (grade 1, n=9; grade 2, n=2; grade 3, n=1), peripheral neuropathy (grade 1, n=9; grade 2, n=1; grade 3, n=1), appetite loss (grade 1, n=7; grade 3, n=1). Adverse event cases were observed in 25 cases.

Figure 2.
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Figure 2.

Overall survival of patients. The Kaplan–Meier survival curve of the 47 rectal carcinoma patients with neoadjuvant therapy. The overall survival of patients with a >10% decrease in the PMI was significantly worse than the patients with not a >10% decrease in their PMI value (Log-rank; p=0.026).

The rate of change of the PMI. The mean pre-neoadjuvant PMI value was 325.4 cm2/m2 (range=146.7-696.1 cm2/m2), and the mean post-neoadjuvant PMI value was 313.0 cm2/m2 (range=110.5-722.3 cm2/m2). The mean rate of change in the PMI was −4.3% (range=−24.8%-25.2%). We used the rate of change of the PMI (a continuous variable) as the test variable and the relapse-free survival (RFS) as the state variable. We found that the appropriate cut-off value for the change in the PMI value was −10% (sensitivity, 0.771%; specificity, 0.583%) using the ROC curve (Figure 1). We set −10% as the cut-off value and classified patients according to the presence or absence of a >10% decrease in the PMI.

The correlation between the change in the PMI and clinicopathological and surgical factors. A >10% decrease in the PMI was observed in 15 of the 47 patients (32%). Table II shows the relationship between the decrease in the PMI and clinicopathological factors. A >10% decrease in the PMI was associated with severe postoperative complications (CDC >3a; p=0.030) but not with sex (p=0.481), body weight loss (p=0.211), age (p=1.00), neoadjuvant therapy (p=0.758), T stage as depth of tumor invasion (p=0.220), lymph node metastasis (p=0.322), tumor size (p=0.505), pathological grade (p=0.753), adjuvant therapy (p=0.728), adjuvant therapy (doublet) (p=0.524), adverse event of neoadjuvant therapy (p=0.133), all complications (p=0.121), operation time (p=0.762), intraoperative blood loss (p=0.753), or surgical procedure (open vs. laparoscopy, p=1.000).

Figure 3.
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Figure 3.

Relapse-free survival of patients. The Kaplan–Meier survival curve of the 47 rectal carcinoma patients with neoadjuvant therapy. The relapse-free survival of patients with a >10% decrease in the PMI was significantly worse than the patients with not a >10% decrease in their PMI value (Log-rank; p=0.018).

The prognostic significance of the change in the PMI. The median follow-up period was 24.1 months among 47 patients. Twelve patients had recurrent disease, and six died from the recurrent disease. Among the patients who showed a >10% decrease in their PMI, six died from the recurrent disease (40%). However, no patients died of RC (0%) among the patients whose PMI values did not decrease by >10%. A >10% decrease in the PMI value was associated with a shorter OS compared to patients whose PMI values did not show a >10% decrease (Figure 2). Among the patients who showed a >10% decrease in their PMI, recurrent disease was observed in seven patients (47%). In contrast, five patients had recurrent RC (16%) among those whose PMI values did not decrease by >10%. A >10% decrease in the PMI value was associated with a shorter RFS than in the patients whose PMI values did not show a >10% decrease (Figure 3).

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Table III.

Univariate and multivariate analysis with respect to relapse-free survival with rectal cancer.

The univariate analyses revealed that a >10% decrease in the PMI and response of neoadjuvant therapy and adjuvant therapy of doublet chemotherapy was significantly associated with RFS (p=0.005). However, neither the pre- nor post-PMI were associated with RFS (p=0.138, p=0.109). In the multivariate analysis, a >10% decrease in the PMI and adjuvant therapy of doublet chemotherapy were independently associated with RFS (Table III).

Discussion

Neoadjuvant therapy has recently been established as a standard treatment for locally advanced RC. However, even if patients are able to tolerate chemotherapy and surgery for RC, the disease may recur. Thus, predicting the risk of recurrence is very important for predicting prognosis after surgery.

In the present study, we investigated the correlation between the prognosis of RC and the change in the PMI after neoadjuvant therapy. The PMI before and after neoadjuvant therapy was not associated with prognosis or postoperative complications. However, the decrease in the PMI during neoadjuvant therapy was associated with postoperative severe complications and a poor RFS and OS.

Sarcopenia is defined as a syndrome characterized by the progressive and systemic loss of skeletal muscle mass and muscular strength (19). Cancer patients are particularly likely to develop sarcopenia because of the catabolic change in proteins caused by excessive inflammatory reactions and their poor nutrition status, due to hypermetabolism and appetite loss. Thus, the association between sarcopenia and cancer has recently received a great deal of attention. Previous studies have shown that sarcopenia is associated with postoperative complications and a poor prognosis in various carcinomas (5-7, 20-22). However, other studies have reported conflicting results (23). Our study showed that there was no relationship between the individual PMI values before and after neoadjuvant therapy and the post-operative complications and prognosis. This result suggests the potential importance of catabolic changes and poor nutrition during neoadjuvant therapy. Indeed, Reisinger et al. reported that a loss of muscle mass during NACRT was associated with postoperative mortality in patients with esophageal malignancies (24, 25).

Patients with a decreased PMI during neoadjuvant therapy are thought to be more likely to develop post-operative severe complications and recurrence than those without such a decrease. Our study showed that preventing a decrease in the PMI helps prevent post-operative complications. It is important to prevent muscle weakness and maintain and improve the nourishment state during neoadjuvant therapy. Specifically, physical exercise and nutritional support may preserve the muscle mass during neoadjuvant therapy. These patients may also need to undergo aggressive adjuvant chemotherapy and receive detailed follow-up.

The present study was associated with certain limitations. First, it was a retrospective study with a short follow-up period and was performed at a single institution with a small number of patients. Second, data on the contents and quantity of the patients' meals and the calories consumed per day during neoadjuvant therapy were not collected. We also focused on the PMI, but other methods of evaluating the muscle mass, such as a bioelectrical impedance analysis were not used because this study was a retrospective study. Third, although we set 10% as the cut-off value in the current study based on the ROC curve findings, the appropriate cut-off value for the decrease in the PMI differed from the values mentioned in previous studies. Larger-scale prospective studies should therefore be performed in order to confirm our findings.

In conclusion, a decrease in the PMI during neoadjuvant therapy was an independent negative prognostic factor for locally advanced RC patients undergoing neoadjuvant therapy. Further prospective studies are needed to confirm the clinical effects of these differences. Finally, nutritional intervention with an elemental diet and physical exercise is required for RC patients undergoing neoadjuvant therapy.

Footnotes

  • Authors' Contributions

    Tatsunari Fukuoka designed the study, performed the statistical analysis and draft the manuscript; Kiyoshi Maeda designed the study, performed the statistical analysis and draft the manuscript; Hisashi Nagahara collected the clinical data and revised the manuscript critically; Masatsune Shibutani collected the clinical data and revised the manuscript critically; Yasuhito Iseki collected the clinical data and revised the manuscript critically; Shinji Matsutani collected the clinical data and revised the manuscript critically; Kosei Hirakawa designed the study and critically reviewed the manuscript; Masaichi Ohira designed the study and critically reviewed the manuscript.

  • Conflicts of Interest

    There are no financial or other interests with regard to the submitted manuscript that might be construed as a conflict of interest.

  • Received July 6, 2019.
  • Revision received July 14, 2019.
  • Accepted July 15, 2019.
  • Copyright© 2019, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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Anticancer Research: 39 (9)
Anticancer Research
Vol. 39, Issue 9
September 2019
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Change in PMI During Neoadjuvant Therapy Is a Predictive Prognostic Marker in Rectal Cancer
TATSUNARI FUKUOKA, KIYOSHI MAEDA, HISASHI NAGAHARA, MASATSUNE SHIBUTANI, YASUHITO ISEKI, SHINJI MATSUTANI, KOSEI HIRAKAWA, MASAICHI OHIRA
Anticancer Research Sep 2019, 39 (9) 5157-5163; DOI: 10.21873/anticanres.13711

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Change in PMI During Neoadjuvant Therapy Is a Predictive Prognostic Marker in Rectal Cancer
TATSUNARI FUKUOKA, KIYOSHI MAEDA, HISASHI NAGAHARA, MASATSUNE SHIBUTANI, YASUHITO ISEKI, SHINJI MATSUTANI, KOSEI HIRAKAWA, MASAICHI OHIRA
Anticancer Research Sep 2019, 39 (9) 5157-5163; DOI: 10.21873/anticanres.13711
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Keywords

  • Psoas muscle index
  • Rectal cancer
  • neoadjuvant therapy
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