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Erschienen in: Radiation Oncology 1/2013

Open Access 01.12.2013 | Research

Palliative radiotherapy in patients with a poor performance status: the palliative effect is correlated with prolongation of the survival time

verfasst von: Shinsaku Yamaguchi, Takayuki Ohguri, Yuichi Matsuki, Katsuya Yahara, Hiroyuki Narisada, Hajime Imada, Yukunori Korogi

Erschienen in: Radiation Oncology | Ausgabe 1/2013

Abstract

Background

The purpose of this study was to analyze the efficacy and tolerability of palliative radiotherapy (RT) in patients with a poor performance status (PS) and to evaluate the relationship between the palliative effect and survival time.

Methods

One hundred and thirty-three patients with a poor PS (Eastern Cooperative Oncology Group 3 or 4) were treated with palliative RT using the three-dimensional conformal technique and retrospectively analyzed. Each patient's primary symptom treated with palliative RT as the major cause of the poor PS was evaluated using the second item of the Support Team Assessment Schedule (STAS) at the start and one week after the completion of palliative RT.

Results

One hundred and fourteen (86%) of the 133 patients completed the planned palliative radiation dose. Grade 3 acute toxicity was observed in two patients (2%) and Grade 2 acute toxicity was observed in 10 patients (9%). No Grade 2 or higher late toxicities were observed, except for Grade 3 radiation pneumonitis in one patient. Improvement in the STAS scores between pre- and post-palliative RT was recorded in 76 (61%) of the 125 patients with available scores of STAS. A significant improvement in the mean STAS score between pre- and post-palliative RT was recognized (p < 0.0001). Improvement in the STAS score was found to be the most statistically significant prognostic factor for overall survival after palliative RT in both the multivariate and univariate analyses. The median overall survival time in the patients with an improvement in the STAS score was 6.4 months, while that in the patients without improvement was 2.4 months (p < 0.0005).

Conclusions

Palliative RT in patients with a poor PS provides symptomatic benefits in more than half of patients without inducing severe toxicities. The palliative effect is strongly correlated with prolongation of the survival time and may contribute to improving the remaining survival time in patients with metastatic/advanced cancer with a poor PS.
Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1748-717X-8-166) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

SY collected and analyzed data, and drafted the manuscript; TO analyzed data and drafted the manuscript; YM collected and analyzed data; KY contributed to data analysis; HN contributed to data analysis; HI contributed to data analysis; YK revised the manuscript. All authors read and approved the final manuscript.
Abkürzungen
RT
Radiotherapy
PS
Performance status
STAS
Support team assessment schedule

Background

Radiation therapy (RT) is widely used to treat cancer, which has become a leading cause of death in Japan, with 275,000 Japanese patients dying of cancer in 2010. RT with palliative intent is administered in approximately 35-50% of cancer patients [1]. Distressing symptoms, including pain, bleeding and obstruction, can often be relieved with minimal toxic effects [2]. Painful bone metastasis, in particular, is common in oncologic practice.
The performance status (PS) has been demonstrated to be strongly correlated with survival as well as treatment outcomes in all types of cancer patients [3]. This may explain why a poor PS is negatively correlated with the RT referral rates [4]. Potential risks, such as serious acute side effects, discomfort associated with the waiting time for treatment, transportation, hospitalization and the duration of the RT course, are concerns in patients with a poor PS [5, 6]. Few clinical studies have assessed the effects of palliative RT in patients with a poor PS, and the merit and prognostic factors of palliative RT have not been established [7, 8].
Several previous studies have demonstrated that the baseline QoL is a significant predictor of survival in patients with advanced cancer [911]. Improvements in the QoL in addition to palliative effects have also been recognized following the administration of palliative RT in several studies [12, 13]. The use of palliative RT, especially that administered to treat bone metastasis, should be considered due to its valuable effects, even in patients with an estimated survival time of three months [14]. Several surgical interventions performed with a palliative intent have exhibited survival benefits in advanced cancer patients with a poor PS [15, 16]. Poststenting RT effectively prolonged the duration of dysphagia relief and improved the overall survival in patients with inoperable esophageal cancer in a randomized trial [17]. In this context, we hypothesized that a meaningful effect of palliative RT would result in prolongation of the limited survival time in patients with advanced/metastatic cancer with a poor PS.
The Support Team Assessment Schedule (STAS) is a proxy assessment scale used to evaluate palliative care that was originally developed in the UK and is currently used worldwide [1820]. The second item of the STAS, symptom control, evaluates the patient’s most severe symptom. The reliability of assessing the primary symptom using the second item of the STAS has been previously established [21]. The purpose of this study was to evaluate the palliative effect, assessed based on the second item of the STAS, and tolerability of palliative RT in patients with a poor PS and to analyze the relationship between the palliative effect and the survival time.

Methods

Patients

Between May 2006 and May 2012, 350 consecutive patients were treated with palliative RT at the authors’ institution. During the same period, there were 133 consecutive patients with 150 lesions treated with palliative RT with a poor PS (Eastern Cooperative Oncology Group 3 or 4) at the start of palliative RT; these patients were enrolled in this retrospective study. Table 1 shows the patients’ clinical characteristics. The pretreatment evaluation included a complete history, physical examination, complete blood count, body computed tomography scan and, in some cases, 18 F-FDG PET/CT and/or magnetic resonance imaging and/or bone scintigraphy. Concomitant diseases associated with a worse performance status were recognized in 19 patients as follows: dementia (n = 8), cerebrovascular disease (n = 5) and others (n = 6). This study was approved by the Institutional Review Board of the authors’ institution.
Table 1
Patient clinical characteristics
Variable
n (%)
Age (y)
Median (range)
75 (38-100)
Gender
  Male
79 (59)
  Female
54 (41)
PS
  3
103 (77)
  4
30 (23)
Concomitant disease associated with worsening PS
  Yes
19 (14)
  No
114 (86)
Primary site
  Lung
51 (38)
  Stomach
8 (6)
  Esophagus
8 (6)
  Bladder
8 (6)
  Breast
7 (5)
  Colorectum
7 (5)
  Prostate
7 (5)
  Liver
6 (5)
  Other
31 (23)
No. of metastatic lesion
  0-3
30 (23)
  ≧ 4
103 (77)
Histology
  Squamous cell carcinoma
30 (23)
  Adenocarcinoma
35 (26)
  Small cell carcinoma
15 (11)
  Hepatocellular carcinoma
6 (5)
  Transitional cell carcinoma
6 (5)
  Other
41 (31)
No. of irradiated site
  One site
117 (88)
  Two sites
15 (11)
  Three sites
1 (1)
Irradiated site (n = 150)
  Primary tumor
  Bladder
7 (5)
  Lung
7 (5)
  Esophagus
5 (3)
  Uterus
3 (2)
  Rectum
3 (2)
  Others
9 (6)
 Metastatic tumor
  Bone
86 (57)
   Vertebrate
47
   Pelvic
17
   Rib
10
   Femur
4
   Others
8
  Brain
18 (12)
  Mediastinum
5 (3)
  Head and neck
3 (2)
  Others
4 (3)

Palliative radiotherapy

All patients were treated with external RT using a linear accelerator with 4, 10 MV or 5–15 MeV electrons (Toshiba PRIMUS linear accelerator equipped with standard multi-leaf collimators). Computed tomography (CT) images were obtained in 5-mm increments over the region of interest. Three-dimensional conformal RT was performed using the Xio (CMS Japan, Tokyo, Japan) treatment planning system in all patients. The clinical target volume (CTV) was defined as the primary tumor or metastatic site (gross tumor volume) plus a 0.5-1.0-cm margin. The planned target volume (PTV) was defined as the CTV plus 0.5-1.0 cm for the daily setup variation and respiratory movement. To reduce the irradiation dose to the organs at risk, 34 (23%) of the 150 lesions were treated with a three- or four-field beam arrangement or conformational therapy. The schedule of palliative RT was as follows: 30 Gy in 10 fractions in 95 lesions (63%), 20 Gy in five fractions in seven lesions (5%), 39 Gy in 13 fractions in five lesions (3%), 8 Gy in one fraction in two lesions (1%) and other in 41 lesions (27%).

STAS measurements

Each patient's primary symptom treated with palliative RT as the major cause of the poor PS was evaluated using the second item of the STAS (Japanese version) at the start of and one week after the completion of palliative RT by one of four radiation oncologists. The second item of the STAS, the various symptom control item, was rated on a 5-point Likert scale with the following definitions: 0 = none, 1 = occasional, single or few symptom(s), the patient performs usual activities and is not bothered by the symptom(s), 2 = moderate distress, occasional bad days, the symptoms limit some activities depending on the extent of the disease, 3 = severe symptom(s) present often, activities and concentration are markedly affected by the symptom(s), 4 = severe and continuous overwhelming symptom(s), the patient is unable to think of other matters.

Evaluation of the tumor response, progression criteria and toxicity

The tumor response was evaluated according to the Response Evaluation Criteria in Solid Tumors using CT and/or a physical examination [22]. The absence of local progression was defined as locally controlled disease, and local control was analyzed in patients monitored for a minimum follow-up of one month. The overall survival was calculated from the first day of palliative RT to the date of death.
Toxicity was graded using the National Cancer Institute Common Toxicity Criteria (CTCAE) version 3. The highest toxicity grade for each patient was used for the toxicity analysis. The toxicity was defined as acute (occurring during therapy and up to three months after therapy) or late (over three months after the completion of therapy).

Statistical analysis

The Wilcoxon signed-rank test was used to assess the STAS scores between pre- and postpalliative RT. Univariate analyses using Fisher’s exact test and multivariate analyses using logistic regression were performed to evaluate the effects of certain factors on improvement of the STAS score. The overall survival and local control rates were calculated using the Kaplan–Meier method. The statistical significance of the differences between the actuarial curves was assessed using the log-rank test. To identify prognostic factors for overall survival, univariate analyses were performed using gender, age, PS, concomitant disease, number of tumors, irradiated site, total RT dose, completion of the planned RT dose, chemotherapy, primary tumor site, target of palliative RT and improvement in the STAS score. Multivariate analyses using the Cox proportional–hazards model were performed to determine the overall survival rates with respect to the PS, concomitant disease, number of tumors, total RT dose, completion of the planned RT dose, primary tumor site and improvement in the STAS score.

Results

The median follow-up period was 2.3 months (range 0.0–47.4) in all patients. One hundred and fourteen (86%) of the 133 patients completed the planned palliative RT dose. The remaining 19 patients (14%) were unable to complete the planned dose due to the following reasons: worsening of the patient’s general condition/comorbidities in 14 patients, patient refusal to continue palliative RT in four patients and acute radiation proctitis in one patient. Regarding acute toxicities, Grade 3 complications were observed in two patients (appetite loss and proctitis) and Grade 2 complications were observed in 10 patients (esophagitis in six patients, appetite loss in two patients, oral mucositis in one patient and tinnitus in one patient). With respect to late toxicities, there were no Grade 2 or higher complications, except for Grade 3 radiation pneumonitis in one patient with lung cancer.
The STAS scores of eight (6%) of the 133 patients were not evaluated due to dementia caused by brain metastases in five patients and deterioration of consciousness in three patients. Improvements in the STAS scores between pre- and postpalliative RT were recorded in 76 (61%) of the total 125 patients, 35 (64%) of the 54 patients with pain, nine (64%) of the 14 patients with dyspnea, six (46%) of the 13 patients with symptoms of increased intracranial pressure, three (30%) of the 10 patients with paralysis and four (44%) of the nine patients with bleeding. The mean STAS scores of all patients at pre- and postpalliative RT were 3.3 and 2.3, respectively, with a statistically significant difference (p < 0.0001) (Figure 1). The mean STAS scores at pre- and postpalliative RT were 3.6 and 2.2 (p < 0.0001) in the 54 patients with pain, 3.6 and 2.6 (p = 0.005) in the 14 patients with dyspnea, 3.2 and 2.8 (p = 0.03) in the 13 patients with symptoms of increased intracranial pressure, 3.7 and 3.0 (p = 0.09) in the 10 patients with paralysis and 2.0 and 1.4 (p = 0.05) in the nine patients with bleeding, respectively (Figure 1). Table 2 shows the results of the univariate and multivariate analyses performed to evaluate the effects of certain factors on improvements in the STAS scores among the 125 patients with available STAS scores. According to the univariate analyses, the irradiated site of bone, completion of the planned RT dose and a total RT dose of ≧30 Gy were found to be significant factors. According to the multivariate analyses, the irradiated site of bone and a performance grade of 3 were found to be significant factors.
Table 2
Univariate and multivariate analyses to evaluate effects of certain factors on an improvement of STAS score in 125 patients with available scores of STAS
  
Univariate
Multivariate
 
n
p
p
Gender
  M/F
76/49
0.85
-
Age
  < 70/≧ 70
47/78
0.56
-
Performance status
  3/4
98/27
0.074
0.013
Concomitant disease
  Yes/No
14/111
0.078
0.322
No. of tumor lesion
  1-3/≧ 4
25/100
0.36
-
Irradiated site
  Bone/others
71/54
0.0054
0.0074
Target of palliative RT
  Metastatic/primary
97/28
0.20
-
Primary tumor site
  Lung/others
51/74
0.58
-
Total RT dose (Gy)
  < 30/≧ 30
20/105
0.047
0.78
Completion of planned RT dose
  Yes/No
109/16
0.013
0.16
Chemotherapy
  Yes/No
25/100
0.82
-
RT radiotherapy.
The median overall survival time of all patients was 4.5 months. The overall survival rate at one year in all patients was 31%. The 1-year local control rate for the 93 patients who were monitored for a minimum follow-up of one month was 72%. In the univariate analyses of the 125 patients with available STAS scores, the statistically significant factors for better overall survival rates were as follows: an improvement in the STAS score, the presence of concomitant diseases, completion of the planned RT dose, a non-lung primary tumor site, a performance status of 3 and the presence of one to three tumors (Figure 2). The median overall survival time in the patients with an improvement in the STAS score was 6.4 months, while that of the patients without an improvement of the STAS score was 2.4 months (p = 0.0005) (Figure 2). In the multivariate analyses of the 125 patients, an improvement in the STAS score, the presence of concomitant diseases, a PS of 3 and a non-lung primary tumor site were found to be statistically significant prognostic factors (Table 3). An improvement in the STAS score was the most statistically significant prognostic factor for overall survival following palliative RT in both the multivariate and univariate analyses.
Table 3
Results of the univariate and multivariate analyses of certain factors for overall survival rates after palliative RT in125 patients with available scores of STAS
  
Univariate
Multivariate
  
MST
 
OR
 
 
n
(mos)
p
(95% CI)
p
Gender
 
  M
76
4.5
0.20
-
-
  F
49
6.3
   
Age
  < 70
47
5.6
0.65
-
-
  ≧ 70
78
4.1
   
Performance status
  3
98
6.3
0.026
1.9
0.064
  4
27
2.0
 
(1.0-3.9)
 
Concomitant disease*
  Yes
14
26.8
0.011
4.5
0.0084
  No
111
3.8
 
(1.5-13.7)
 
No. of tumor lesion
  1-3
25
6.3
0.041
1.4
0.42
  ≧ 4
100
3.6
 
(0.6-3.1)
 
Irradiated site
  Bone
71
4.7
0.94
-
-
  Others
54
4.4
   
Target of palliative RT
  Metastatic tumor
97
3.8
0.14
-
-
  Primary tumor
28
6.3
   
Primary tumor site
  Lung
51
3.4
0.020
2.2
0.011
  Others
74
6.1
 
(1.2-3.9)
 
Total RT dose (Gy)
  <30
20
0.7
0.080
1.1
0.91
  ≧ 30
105
4.9
 
(0.4-2.7)
 
Completion of planned RT dose
  Yes
109
5.0
0.0025
2.0
0.170
  No
16
0.5
 
(0.7-5.2)
 
Chemotherapy
  Yes
25
5.6
0.82
-
-
  No
100
3.9
   
Improvement of STAS score
  Yes
76
6.4
0.0005
3.7
<0.0001
  No
49
2.4
 
(2.0-6.6)
 
RT radiotherapy, STAS Support Team Assesment Schedule, MST median survival time, OR odds ratio, CI confidence interval.
*associated with a worse performance status.

Discussion

The present study is the first study to assess the various palliative RT effects observed in patients with a poor PS using the second item of the STAS. To our knowledge, previous reports of detailed treatment results of palliative RT in patients with a poor PS are limited [7, 8]. Yamazaki et al. analyzed the feasibility of palliative RT in patients with an ECOG PS of 3–4 and found that the treatment completion rate (79%) in the patients with a PS of 3–4 was significantly worse than that (89%) observed in the patients with a PS of 0–2 [8]. Campos et al. demonstrated that the PS, as measured by KPS, is significantly related to the response rate one month after palliative RT in patients with painful bone metastases. In their study, the response rate was 44% in patients with a KPS of ≦40, 44% in patients with a KPS of 50–60, 57% in patients with a KPS of 70–80 and 68% in patients with a KPS of 90–100; however, no such relationships were observed at two or three months [7]. Dennis et al. reported that patients suffering from painful bone metastases with an estimated survival of three months whose median KPS score is 60 should still be considered for palliative RT because, in their study, the overall rate of pain relief was as favorable as 70% at one month and 63% at two months [14]. Similarly, in the current study, the treatment completion rate was 86%, and an improvement in the STAS score following palliative RT was recorded in 64% of the patients with pain. In addition, a PS of 3 was found to be a better predictive factor of improvements in the STAS score than a PS of 4 in the multivariate analyses. We confirmed that administering palliative RT in patients with a poor PS is feasible and offers significant palliative effects, especially in patients with pain, dyspnea and symptoms of increased intracranial pressure.
Previous studies have shown that the baseline QoL is a strong independent predictor of survival in patients with advanced cancer [911]. Langendijk et al. reported that the global QoL assessed using the EORTC QLQ-C30 is also a strong prognostic factor for survival in patients with NSCLC treated with RT [23]. There are few reports regarding the correlation between the palliative effects of RT and the duration of survival [24]. Stevens et al. reported that, according to a multivariate analysis, the independent predictive factors for overall survival in head and neck cancer patients treated with palliative RT included a positive treatment response and a higher radiation dose [24]. Recently, Temel et al. examined the effects of introducing palliative care early after diagnosis in a randomized trial of patients with metastatic non-small cell lung cancer and demonstrated that providing early palliative care led to significant improvements in both the quality of life and duration of survival [25]. Nieder et al. demonstrated that, in a randomized clinical trial of whole-brain RT versus best supportive care in patients with brain metastases and adverse prognostic factors, significant improvements in survival time were observed in the 30 Gy whole-brain RT group in comparison to the 20 Gy whole-brain RT group [26]. In the current study, an improvement in the STAS score following palliative RT was found to be the most statistically significant prognostic factor for overall survival in both the univariate and multivariate analyses. Therefore, we suppose that the good palliative effects of RT observed in patients with a poor PS can result in not only improvement of the QoL, but also prolongation of the limited survival time.
Chow et al. reported a predictive model for survival from the time of presentation in an outpatient palliative RT clinic and found that six prognostic factors (primary cancer site, site of metastases, Karnofsky PS and the fatigue, appetite and shortness-of-breath items on the Edmonton Symptom Assessment Scale) had a statistically significant impact in the 395 patients who were prospectively analyzed [27]. In the current study, the palliative effect at one week after the completion of RT was found to be the most statistically significant prognostic factor for overall survival, although the primary cancer site and PS were also identified as significant predictors. Therefore, the palliative RT effect, as well as previously reported prognostic factors, may contribute to predicting the survival time in metastatic/advanced cancer patients with a poor PS.
The proxy assessment of the STAS scale has been used in various palliative settings, including support teams in the community, hospitals and hospices and in both cancer and acquired immunodeficiency syndrome patients [1821]. Patient self-assessment of symptoms is the gold standard in the palliative care setting. However, patients with a poor PS are unstable and suffer from various symptoms; therefore, completing a self-assessment of symptoms is difficult for these patients. In such situations, the use of a proxy assessment scale, such as the STAS, by medical practitioners is useful because an improvement in the STAS score was found to be the most statistically significant prognostic factor in the current study.
A meta-analysis of dose-fractionation RT trials found no significant differences in complete or overall pain relief between single- and multifraction palliative RT in patients with bone metastasis [28]. Most cancer patients destined for palliative RT have a very limited life span. In such situations, finding a balance between the potential benefits of treatment and the risk of toxicity and inconvenience for the patient is essential. The use of protracted treatment regimens is not appropriate in patients with a poor PS. In the current study, single-fraction RT was administered in only two patients, and 14% of the patients were unable to complete the planned palliative RT dose primarily due to general deterioration. Therefore, we suggest that single-fraction palliative RT be considered in such cases and may be worthwhile, especially in patients with poor prognostic factors for survival.
Our study is associated with several limitations. First, it is a retrospective study that introduces the possibility of treatment selection bias. Moreover, it was a relatively small case series conducted in a single institute, and both the patient profiles and RT regimens were heterogeneous. Therefore, in the future, large prospective studies are required to investigate the actual benefits of palliative RT, including the effects on survival and the QoL, in patients with a poor PS.

Conclusions

In summary, this is the first report that attempted to assess the efficacy and tolerability of palliative RT in patients with a poor PS and to evaluate the relationship between the palliative RT effect and the survival time using the second item of the STAS. The use of palliative RT in patients with a poor PS was found to be feasible, and significant palliative effects were obtained, especially for pain, dyspnea and symptoms of increased intracranial pressure. The palliative effect at one week after the completion of RT was found to be strongly correlated with prolongation of the survival time, which may contribute to the assessment of the remaining survival time in metastatic/advanced cancer patients with a poor PS. These results justify conducting further prospective evaluations with detailed treatment protocols, including those regarding the radiation dose and fractionation, to clarify whether palliative RT can improve the limited survival time and QoL in patients with a poor PS.
Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License ( https://​creativecommons.​org/​licenses/​by/​2.​0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

SY collected and analyzed data, and drafted the manuscript; TO analyzed data and drafted the manuscript; YM collected and analyzed data; KY contributed to data analysis; HN contributed to data analysis; HI contributed to data analysis; YK revised the manuscript. All authors read and approved the final manuscript.
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Metadaten
Titel
Palliative radiotherapy in patients with a poor performance status: the palliative effect is correlated with prolongation of the survival time
verfasst von
Shinsaku Yamaguchi
Takayuki Ohguri
Yuichi Matsuki
Katsuya Yahara
Hiroyuki Narisada
Hajime Imada
Yukunori Korogi
Publikationsdatum
01.12.2013
Verlag
BioMed Central
Erschienen in
Radiation Oncology / Ausgabe 1/2013
Elektronische ISSN: 1748-717X
DOI
https://doi.org/10.1186/1748-717X-8-166

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