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Erschienen in: Journal of Medical Case Reports 1/2017

Open Access 01.12.2017 | Research article

Surgical intervention for vertebral metastases may benefit lung cancer patients no less than other patients: a retrospective study

verfasst von: Takashi Kobayashi, Naohisa Miyakoshi, Toshiki Abe, Eiji Abe, Kazuma Kikuchi, Yoichi Shimada, Seiko Matsumoto, Shin Fukui

Erschienen in: Journal of Medical Case Reports | Ausgabe 1/2017

Abstract

Background

Spinal metastasis is considered to have a worse prognosis in lung cancer than in other cancers, but recent clinical studies report improved overall survival of lung cancer. We compared the postoperative prognoses of vertebral metastatic tumors from lung with other types of cancer.

Methods

From 2011 to 2015, 31 Japanese patients (mean age 73 years, range 55–88 years; 19 males, 12 females) underwent surgery for spinal metastasis at our center. We observed patients retrospectively in March 2016, dividing them into groups by cancer type: lung (LK group, n = 10); prostate, breast, or thyroid (PB group, n = 12); and other (OT group, n = 9). We compared survival and revised Tokuhashi score, which provides a basis for choosing a treatment course. Neurologic status was graded before and after surgery using the Frankel system.

Results

Mean follow-up was 16.5 months (range 1–62 months). Only seven of 31 patients (22.6%) were alive at final follow-up. Frankel grade significantly improved postoperatively only in the LK (P = 0.01) and PB (P = 0.048) groups. Revised Tokuhashi score differed across groups (P < 0.0001), and was significantly lower in the LK group than in the PB group (P = 0.00) and OT group (P = 0.02). Postoperative survival was significantly shorter in the LK group than in the PB group (P = 0.01) but did not differ between the LK and OT groups.

Conclusions

The revised Tokuhashi score may underestimate the survival of lung cancer patients, who may derive the same benefit from surgical intervention as those with vertebral metastasis from other cancer types.

Background

Lung cancer is the third most common cancer, and the most common cause of cancer death in Japan [1]. However, overall survival of lung cancer has recently improved [2]. Bone metastases from lung cancer are common, affecting 36% of patients with advanced lung cancer [3]. The spine is the most common site of metastatic lesions, which can impair mobility and functional independence [3]. On histology, adenocarcinoma and squamous cell carcinoma are associated with higher and lower risks of developing bone metastases [4]. Surgery is the most effective method of pain relief and recovery from palsy due to paraparesis from vertebral metastasis, and is therefore the treatment of choice when survival longer than 3 months is predicted [5, 6]. The treatment strategy and procedure should be based on life expectancy [79]; the revised Tokuhashi score is generally used to evaluate the prognosis of patients with a metastatic vertebral tumor before considering surgical treatment [1018]. The revised Tokuhashi score is based on six parameters, including patient condition, number of bone metastases outside spine, metastasis to major organs, primary site, and palsy (Table 1). “Palsy” is evaluated using Frankel scores. Frankel scores are defined as follows: A, complete neurological injury; B, preserved sensation only; C, preserved motor, nonfunctional; D, preserved motor, functional; E, normal (no neurological injury). Proper use of the revised Tokuhashi score to determine whether, on the basis of life expectancy, a patient is a surgical candidate can help surgical decision-making in patients with spinal metastases [1618]. The prognosis of lung cancer metastatic to the spine is considered worse than that of other cancers with spinal metastases [79, 19]. However, recent clinical studies have shown improvement in the overall survival of lung cancer [2]. This progress has been facilitated by the introduction of new drugs, and by patient selection based on the recognition that different histological subtypes and driver mutations determine the biology of these malignancies and predict drug efficacy [20]. Therefore, whether the revised Tokuhashi score properly evaluates the prognosis of lung cancer has been called into question. For patients with vertebral metastases, we choose surgery when survival greater than 3 months is expected based on either the original or an unknown malignancy.
Table 1
Modified Tokuhashi score
Prognosis parameter
Score
General condition
 Poor (performance status 10–40%)
0
 Moderate (performance status 50–70%)
1
 Good (performance status 80–100%)
2
Number of bone metastases outside spine
 >2
0
 ≤2
1
 0
2
Metastasis to major organs
 Non-removable
0
 Removable
1
 None
2
Primary site
 Lung, osteosarcoma, stomach, bladder, esophagus, pancreas
0
 Liver, gallbladder, unidentified
1
 Other
2
 Kidney, uterus
3
 Rectum
4
 Thyroid, breast, prostate, carcinoid tumor
5
Palsy
 Complete (Frankel A, B)
0
 Incomplete (Frankel C, D)
1
 None (Frankel E)
2
The purpose of this study was to compare the prognoses of surgically treated patients with a vertebral metastatic tumor from lung versus other cancers, and to determine whether the revised Tokuhashi score properly evaluates the prognosis of lung cancer.

Methods

Thirty-three consecutive Japanese patients underwent surgery for treatment of spinal metastases at Akita Kousei Medical Center from April 2011 to September 2015. Thirty-one patients (mean age 73.4 years, range 55–88 years; 19 males, 12 females) were included in the study. Two patients were removed because of a lack of clinical data. We observed patients retrospectively in March of 2016. The primary lesions were lung (n = 10), and other (n = 21). Lung cancers were categorized by histology as non-small-cell lung cancer in nine patients and small-cell lung cancer in one patient. Preoperative assessments included medical history, history of primary tumors, and spinal magnetic resonance imaging. Expected survival >3 months was used as a criterion for choosing surgical treatment [5, 6]. Patient survival and physical and neurological status were noted. The prognosis was evaluated retrospectively using the revised Tokuhashi score. Neurological status was graded before and after surgery using the Frankel system [21]. The postoperative Frankel grade was assigned 1–2 months after surgery, at which time the neurological status was likely to be maximal.
Cases were divided into three groups: lung cancer (LK group, n = 10); prostate, breast, or thyroid cancer (PB group, n = 12); and other (OT group, n = 9), and revised Tokuhashi score and survival periods were compared. Patients’ profiles are shown in Table 2. Survival rates were compared using Kaplan–Meier analysis and the log-rank statistic. All data are expressed as a mean ± standard deviation. All tests of significance were two-tailed, and differences with a P value <0.05 were considered statistically significant. All statistical analyses were performed with EZR (Saitama Medical Center, Jichi Medical University, Saitama, Japan), which is a graphical user interface for R (The R Foundation for Statistical Computing, Vienna, Austria).
Table 2
Patient profiles
 
Age (years)
Sex
Primary tumor type
Revised Tokuhashi score
Complication
Survival period (month)
Preoperative Frankel scorea
Postoperative Frankel scorea
Initial stageb
General condition
Extraspinal bone metastases
Vertebral metastases
Internal organ
Primary site
Palsy
Tokuhashi score
LK
 1
78
f
Lung
0
2
0
2
0
1
5
 
9
C
D
3
 2
81
f
Lung
0
2
1
2
0
1
6
 
35
C
D
4
 3
87
f
Lung
0
2
2
0
0
1
5
 
4
C
D
1
 4
72
m
Lung
0
2
0
2
0
1
5
 
3
C
D
4
 5
60
f
Lung
1
2
1
2
0
1
7
 
26
D
D
4
 6
86
f
Lung
0
2
0
2
0
1
5
 
12
C
D
4
 7
82
m
Lung
0
1
0
0
0
0
1
infection
1
A
A
3
 8
72
m
Lung
0
1
2
2
0
1
6
 
3
C
C
4
 9
65
m
Lung
1
2
0
0
0
1
4
 
8
C
D
4
 10
69
f
Lung
0
1
0
2
0
1
4
 
7
C
D
4
Average
75.2 ± 9.1
  
0.2 ± 0.4
1.7 ± 0.5
0.6 ± 0.8
1.4 ± 1.0
0
0.9 ± 0.3
4.8 ± 1.6
 
10.8 ± 11.1
   
PB
 11
76
m
Prostate
0
2
2
2
5
1
12
 
62
C
D
4
 12
74
m
Prostate
1
2
1
2
5
1
12
 
11
D
D
3
 13
68
m
Thyroid
1
2
2
2
5
1
13
 
53
D
D
4
 14
84
f
Breast
0
2
1
2
5
1
11
 
44
C
D
1
 15
55
f
Breast
1
0
2
2
5
1
11
 
40
D
D
4
 16
70
m
Prostate
0
1
2
2
5
0
10
 
24
B
D
4
 17
72
m
Prostate
1
2
0
2
5
1
11
infection
27
D
D
4
 18
66
f
Thyroid
1
2
1
2
5
1
12
 
26
D
D
4
 19
88
m
Prostate
0
2
0
2
5
0
9
 
10
A
A
4
 20
62
f
Breast
2
2
2
2
5
1
14
 
26
D
D
4
 21
58
m
Prostate
0
2
0
0
5
1
8
 
3
C
D
4
 22
73
m
Prostate
0
1
0
2
5
1
9
 
5
C
D
4
Average
70.5 ± 9.7
  
0.6 ± 0.7
1.7 ± 0.7
1.1 ± 0.9
1.8 ± 0.6
5
0.8 ± 0.4
11.0 ± 1.8
 
27.6 ± 19.0
   
OT
 23
71
f
Rectum
0
2
2
0
4
1
9
 
19
D
D
2
 24
76
m
Kidney
0
2
2
2
3
1
10
 
8
D
D
1
 25
71
m
Kidney
0
2
0
0
3
1
6
 
7
C
D
4
 26
83
m
Rhabdomyosarcoma
0
2
2
2
2
1
9
 
3
C
C
4
 27
78
m
Kidney
0
2
0
2
3
1
8
infection
5
C
C
4
 28
87
m
Unknown
0
2
2
2
1
1
8
 
8
C
D
4
 29
62
m
Colon
0
2
0
0
2
1
5
 
2
C
C
4
 30
70
m
Colon
0
1
1
0
2
1
5
 
10
D
D
3
 31
79
f
Multiple myeloma
0
2
0
2
2
1
7
 
9
C
C
4
Average
75.2 ± 7.6
  
0
1.9 ± 0.3
1.0 ± 1.0
1.1 ± 1.1
2.4 ± 0.9
1
7.4 ± 1.8
 
7.9 ± 5.0
   
LK lung cancer group, PB prostate, breast, or thyroid cancer group, OT other cancers group, m male, f female
aFrankel scores: A, complete neurological injury; B, preserved sensation only; C, preserved motor, nonfunctional; D, preserved motor, functional; E, normal (no neurological injury)
bInitial stage: 1, localized; 2, early locally advanced; 3, late locally advanced; 4, metastasized

Results

Clinical data for all patients, including primary tumor type and location of metastases, are presented in Table 2. All patients had neurological deficits. Mean follow-up was 16.5 months (range 1–62 months). At final follow-up, seven of the 31 patients were alive.
Group comparisons of age, sex, and initial stage were performed with the Kruskal–Wallis test [22], which is a nonparametric method for testing, and there was no significant difference among the groups.
Overall, Frankel classifications improved postoperatively (P = 0.00). The mean revised Tokuhashi score was 8.0 (range 1–14). Regarding surgical interventions, total en bloc spondylectomy was performed in three patients, anterior spinal decompression and instrumentation in one patient, posterior spinal decompression and instrumentation in 25 patients, and laminectomy alone in two patients.
The Frankel classification improved significantly preoperatively to postoperatively in the LK (P = 0.01) and PB (P = 0.047) groups, but not in the OT group.
Mean revised Tokuhashi scores for each group are presented in Table 2. Group comparisons of the revised Tokuhashi score were performed with the Kruskal–Wallis test. The revised Tokuhashi score differed significantly across groups (Kruskal–Wallis chi-squared = 22.1, degrees of freedom = 2, P < 0.0001). Pairwise comparisons using the Mann–Whitney U test revealed the Tokuhashi score of the LK group to be significantly lower than that of both the PB group (P = 0.00) and OT group (P = 0.02). There was no significant difference in the survival period with initial stages of “localized” or “early locally advanced” carcinoma compared with “late locally advanced” or “metastasized” carcinoma (Mann–Whitney U test).
Mortality after the operation was compared among groups by applying Kaplan–Meier analysis and the log-rank statistic. The postoperative survival period differed significantly among the three groups (P = 0.00, Fig. 1). Pairwise comparisons using the log rank test revealed the survival period of the LK group to be significantly shorter than that of the PB group (P = 0.01), but there was no difference between the LK and OT groups (Fig. 1). The median survival time after the surgical treatment was 7.5 months in the LK group, 44.0 months in the PB group, and 8.0 months in the OT group.

Discussion

The prognostic factors associated with spinal metastases are unclear. Surgery can improve mechanical stability, cord compression, and pain, and may be considered when a patient has a life expectancy of >3 months [5, 6]. Palliative surgery for spinal metastasis can improve the quality and length of life [23]. The revised Tokuhashi score is an important and effective tool for considering the prognosis of patients with a metastatic vertebral tumor [1018]. Spinal metastases are considered to carry a worse prognosis in patients with lung cancer compared with other cancers [79, 19]; therefore, conservative treatment is selected for many lung cancer patients. However, improvements in chemotherapy, radiotherapy, and hormonal therapies have led to increased survival times for patients with lung cancer [2, 20].
Our results show that the postoperative survival period after surgical treatment of vertebral metastases was significantly shorter in the LK group than in the PB group, but did not differ between the LK and OT groups, even though the revised Tokuhashi score of the LK group was significantly lower than that of the PB and OT groups.
The present study highlights two important clinical issues. First, some cases of vertebral metastasis from lung cancer can be expected to have a long survival period. Patients with a revised Tokuhashi score of 0–8 are expected to survive <3 months. In the revised Tokuhashi scoring system, lung cancer is assigned 0 points, giving a low score to a lung cancer patient with Frankel C palsy. However, a lack of correlation between the revised Tokuhashi score and the survival period has been reported for patients with spinal metastases of lung cancer [2426]. Ogihara et al. recommended surgical treatment of spinal metastases from lung cancer for patients without hypercalcemia or hypoalbuminemia [24]. Bilsky et al. showed that, when considering surgical intervention, patient-by-patient assessment may be more important than the result of a scoring instrument such as the Tokuhashi score [27].
Second, the present study demonstrates that, when considering treatment of vertebral metastasis of lung cancer, surgical treatment may be appropriate even if the revised Tokuhashi score is <8 points. Chemotherapy, radiotherapy, and surgery are three treatment options for spinal metastases; of these, surgery is most effective for early mobilization and return to functional ambulation, but it is also the most invasive treatment and risks complications such as infection and worsening of palsy. However, only one of the 11 lung cancer patients in the present study had a severe postoperative complication; that patient (patient #7, Table 2) died from a surgical site infection 1 month after surgery. Despite the fears surrounding the invasiveness of surgery and its associated risks, we had a low rate of surgical complication. Hirabayashi et al. showed that postoperative ambulation was associated with a longer survival time after surgery for spinal metastases in patients with lung cancer [23]. Surgical treatment for a vertebral tumor from lung cancer can improve the quality of life and survival time [28]. Therefore, considering the advances made in lung cancer treatment and the results of the present study, we believe that the revised Tokuhashi score requires further revision, and that a primary cancer site score of 0 for lung cancer may no longer be justified. Because the average score for the primary cancer site in the OT group was 2.4, we believe that a score of 2 for lung cancer may be appropriate.
The limitations of the present study were its relatively small number of patients, the heterogeneity of the OT group, and the questionable validity of comparing the LK and OT groups.

Conclusions

The revised Tokuhashi score may underestimate the survival of lung cancer patients, who could derive the same benefit from surgical intervention as those with vertebral metastasis from other types of cancer.

Acknowledgements

The authors wish to thank Mamiko Kondo, Emi Nakayama, and coworkers for their valuable assistance with the editing of this manuscript.

Funding

No funding was received for this study.

Availability of data and materials

The authors have obtained consent to publish from all the patients. The authors agree to make the raw data and materials described in our manuscript freely available.

Authors’ contributions

TK was the major contributors in writing the manuscript. NM, EA, TA, KK, SM, SF, and YS supervised the whole work. All authors read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.
Written informed consent was obtained from the patients for publication of this report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
This study is in accordance with the ethical standards in the 1964 Declaration of Helsinki. The institutional ethics committee of Akita Kousei Medical Center approved this project. Prior to data collection, consent to participate was obtained from all the patients involved in the study.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://​creativecommons.​org/​licenses/​by/​4.​0/​), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://​creativecommons.​org/​publicdomain/​zero/​1.​0/​) applies to the data made available in this article, unless otherwise stated.

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Metadaten
Titel
Surgical intervention for vertebral metastases may benefit lung cancer patients no less than other patients: a retrospective study
verfasst von
Takashi Kobayashi
Naohisa Miyakoshi
Toshiki Abe
Eiji Abe
Kazuma Kikuchi
Yoichi Shimada
Seiko Matsumoto
Shin Fukui
Publikationsdatum
01.12.2017
Verlag
BioMed Central
Erschienen in
Journal of Medical Case Reports / Ausgabe 1/2017
Elektronische ISSN: 1752-1947
DOI
https://doi.org/10.1186/s13256-016-1157-3

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