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Table of Contents
ORIGINAL ARTICLE
Year : 2018  |  Volume : 1  |  Issue : 1  |  Page : 40-45

Clinicians view and practice pattern on the use of stereotactic radiosurgery in brain metastases: A survey among Indian radiation oncologists


1 Department of Radiation Oncology, Medica Cancer Hospital, Siliguri, West Bengal, India
2 Department of Radiotherapy, Malabar Cancer Centre, Thalassery, Kerala, India
3 Deparment of Radiotherapy, R.G. Kar Medical College and Hospital, Kolkata, West Bengal, India

Date of Submission22-Jun-2018
Date of Acceptance03-Sep-2018
Date of Web Publication14-Nov-2018

Correspondence Address:
Dr. Kazi Sazzad Manir
Department of Radiation Oncology, Medica Cancer Hospital, Rangapani, Siliguri - 734 434, West Bengal
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/IJNO.IJNO_3_18

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  Abstract 


Context: Due to increased incidence of late neurotoxicities associated with whole-brain radiotherapy (WBRT), the idea of treating limited brain metastasis (BM) (1–4) only with stereotactic radiosurgery (SRS) has become an interesting topic. Due to lack of SRS facilities, there is a major disagreement in the use of SRS in BMs.
Aims: In our study, we tried to find out views and practice patterns of the Indian radiation oncologists (RO) on the use of SRS in BMs.
Setting and Design: This is an internet-based, cross-sectional survey among ROs.
Materials and Methods: Online questionnaires were sent to 411 RO through an online survey portal (SurveyMonkey®). Responses were analyzed.
Results: Among which, 24.6% (101) responded completely. 39.6% were from teaching hospitals and 49.4% (48) were had <5 years of postspecialization experiences. About 38% (36) treats 30–100 BMs cases/month. Among the respondents who have SRS facilities (25.8%), only 26.1% use SRS routinely for BMs. Majorities (39.7%) have <3-year experiences. In oligometastases (1-4), 56.1% still practice WBRT only, though 57.6% feel that WBRT followed by SRS boost is the ideal treatment. 30.2% RO feels that local control is most important outcome determining factor for single metastasis, 40.9% RO feels the best modality is SRS alone. For treating >5 metastases, 92.1% ROs practice WBRT only.
Conclusions: This is probably the first study on practice patterns of SRS in India if not the world. Major discordance exists between practice patterns and views on SRS use among RO in India. Majority do not practice SRS due to lack of facilities.

Keywords: Brain metastases, neurotoxicity, stereotactic radiosurgery, whole-brain radiotherapy


How to cite this article:
Manir KS, Mukherjee A, Banerjee D, Basu A, Basu S, Guha S. Clinicians view and practice pattern on the use of stereotactic radiosurgery in brain metastases: A survey among Indian radiation oncologists. Int J Neurooncol 2018;1:40-5

How to cite this URL:
Manir KS, Mukherjee A, Banerjee D, Basu A, Basu S, Guha S. Clinicians view and practice pattern on the use of stereotactic radiosurgery in brain metastases: A survey among Indian radiation oncologists. Int J Neurooncol [serial online] 2018 [cited 2019 Jun 20];1:40-5. Available from: http://www.Internationaljneurooncology.com/text.asp?2018/1/1/40/245362




  Introduction Top


The incidence of brain metastases (BMs) in cancer patients varies widely between 9% and 50%.[1],[2],[3] The occurrence of BMs generally indicates terminal stage of a cancer patient due to the poor outcome associated with it.[4],[5] For the management of single or multiple BM, various treatment options such as surgery, whole-brain radiotherapy (WBRT), stereotactic radiosurgery (SRS), and systemic therapy (chemotherapy/immunotherapy) are available. Best supportive care can be offered to terminally ill patients not suitable for any therapeutic intervention. The choice of any specific treatment modality or any combination of the above options depend on patient factors (such as age, performance status, and neurological status), tumor factors (such as number and size of BMs, tumor type, and extracranial disease burden), and availability of these modalities in any particular oncology center.[4],[6] Timely intervention with an appropriate therapeutic modality can provide local control, improve quality of life, prevent deaths from neurological causes, and often improve survival in this prognostically poor group of patients.[7],[8]

Since 1970s, WBRT has remained the traditional standard treatment for BM. Retrospective series have shown its efficacy to improve survival from 1 to 3 months and often higher[5],[9],[10] when used alone or in combination with surgery. SRS is the latest treatment modality for BM in which suitably small-sized BM, usually <4 cm, can be ablated using a single large dose of high-precision radiotherapy.[11] While WBRT has been proven to significantly reduce the intracranial relapse rate, its potential for neurotoxicity has been a matter of much concern as it suggests a detriment in the already poor quality of life of BM patients and limits reapplication when the need arise again.[12],[13] Furthermore, some prospective studies have revealed that local control of WBRT does not translate into improvement of survival.[14],[15] Quite naturally, these areas of concern were specifically investigated in recent landmark trials of SRS compared against WBRT, either alone or in combination with the later in low-volume BM. Mixed results were obtained from these trials, but the efficacy of SRS alone in conferring a survival benefit in carefully selected BM patients was clearly established.[16],[17],[18],[19]

Witnessing the rapid rise in popularity of SRS globally, we thought of assessing the patterns of practice of SRS among radiation oncologists (ROs) of India. According to AERB 2012 statistics, the total number of oncology centers in India with radiotherapy facilities is 319. Among all these centers, only 32 centers provide SRS facilities (including 5 cyberknife, 7 gamma knife, and 2 tomotherapy).[20] Hence, this study will also reflect the opinions about SRS among ROs who have no access to such facility. This may be relevant to similar oncology centers in other developing and underdeveloped countries.


  Materials and Methods Top


We have conducted an internet survey-based, cross-sectional study among (RO) practicing in India, with the aim of finding out the practice patterns and their opinion regarding use of SRS in BM. Total study duration was 3 months (July 2016 to September 2016).

Online were sent to 411 ROs practicing over India through online survey portal: SurveyMonkey (which is an online survey portal with the features of real-time results, text analysis, SPSS integration, custom reporting, etc.). The participants were asked to answer 26 questions including baseline information. The response was anonymous.

The survey includes questions regarding availability of SRS facilities in their institutes, patient load, ratio of planning treatment time between SRS and EBRT, and their opinion for treating limited BM. The response of the survey was evaluated and results were analyzed.


  Results Top


Questionnaires were sent to 411 RO. Total respondents were 24.6% (n = 101), among which 82.3% (82) responses were complete.

Baseline characteristics

Question 1: Nature of center:

Among all respondents (101) 33.6% (32) were from academic referral center. 39.6% (40) were from teaching hospitals, whereas 25.7% (26) were from nonteaching private hospitals and 1% (1) was from teaching private hospital.

Question 2: Working zone:

Among all (101), participants from Eastern India were maximum in number, that is, 39% (39) About 25% (25), 20% (20), and 16% (16) were from Northern, Western, and Southern part of the country, respectively.

Question 3 and 4: Working tier and experience in radiation oncology:

Among the respondents (100), 30.7% (31) were senior consultants/senior teachers, 30.7% (31) were junior consultants/junior teachers, and 38.6 (39%) were residents. About 49.5% (48) had <5 years' experience in this field, whereas, 33% (32),6.2% (6), and 11.4% (11) had 5–10 years, 10–20 years, and >20 years experiences, respectively.

Question 5 and 6: Incidence of new cases and BM cases:

Among the respondents (96), 17.7% (17) said that new case registration/year in there is <1000. About 42.7% (41) participants have 1000–3000 new cases/year in their center, whereas 17.7% (17) and 21.9% (21) participants have 3000–5000 and >5000 cases registered/year, respectively.

Nearly 25.3% (24) respondents have 10–30 BM cases/month in their radiotherapy department. 37.9% (36) have 30–100 cases and 36.8% (35) have >100 BM cases/month in their department.

Question 7 and 8: Neurosurgery and SRS facility availability:

Among all respondents (90), 77.9% (70) respondents have standard neurosurgery facility, whereas 25.8% (23) have standard SRS facility in their hospitals.

Question 7–17: SRS practice and experiences:

Among the respondents (23) who have SRS facilities only 26.1% (6) use SRS routinely for BM. Among all respondents (68), 35.3% (24) do not have any experience in SRS. 39.7% (27) have <3 years experiences, 11.8% (8) have 3–5 years of experience, and 13.2% (9) have >5 years experiences in SRS. Among all respondents (87), 28.7% have linear accelerator (LA) with frame, 39.1% (34) are using LA without frame, and 8% (7) are using gamma knife. Upon asking machine preferences, among all respondents (69), 37.7% (26) preferred LA without frame, 24.6% (17) prefer LA with frame, and 13% (9) preferred gamma knife.

We asked about time ratio of SRS versus WBRT planning of BM at their department. Among all respondents (44), 25% (11) said it as 2:1, 18.1% (8) said 3:1, 13.6% (6) said its 4:1, and 15.9% (7) said its 5:1. Majority 27.1% (12) said it is >5.1.

Question 18: Cobalt 60-based WBRT:

Among all respondents (64), 90.6% (58) have experiences in Cobalt 60 based WBRT in BM.

Question 19–23: Oligometastasis (1-4 metastases) treatments and modalities:

All the responses related to questions about oligo-metastasis (es) are detailed in [Table 1].
Table 1: Opinions on treatment and modalities in oligometastases brain (1-4 metastases)

Click here to view


Question 24–26: Multiple BM:

We asked about the current treatment protocols for treating multiple (≥5) BMs. Among all respondents (63), 92.1% (58) said WBRT and 7.9% (5) said it is WBRT and SRS boost. Upon asking the key decision-making factor in multiple BMs, among all responses (58), 89.7% (52) said tumor volume burden and 10.3% (6) said it is the number of metastases foci.


  Discussion Top


As discussed in the beginning, SRS has revolutionized the treatment of BM since the last decade. It has become so eagerly accepted by ROs all over the world that the century-old standard of care, namely WBRT, is now being questioned for its deleterious effect of neurocognitive outcome of BM patients, especially with increased survival of nearly all types of Stage IV cancer these days. The rationale behind this trend is chiefly because SRS offers a chance of cure in low-volume BM while WBRT is essentially a palliative treatment modality. In fact, two robust studies have proven that addition of SRS to WBRT can improve survival.[16],[21] The recent ASTRO trial went one step further showing that SRS alone renders improved survival in BM patients under 50 years of age in the absence of WBRT.[22] Whether Indian ROs share the same enthusiasm as their global counterparts can only be gauged by knowing their perceptions, training exposure, and experience about SRS in clinical practice. This study aims to explore these areas to understand the current practice of SRS in India.

The electronic module is an effective tool for conducting surveys in a resource-constrained setting. At the same time, there is the inherent drawback of poor response rate due to various reasons such as lack of time, apathy to share personal choices, especially on treatment decision-making, or simply poor access to internet facilities. For these reasons, only 24.6% ROs responded to this online survey. This is the usual response rate for surveys over E-mail.[23] A similar survey conducted by Tata Memorial Centre, Mumbai, on stereotactic body radiotherapy also witnessed a response rate of 24%.[24]

Most (71.2%, 72) of the respondents were from academic referral centers and teaching hospitals, that is, government hospitals. This is an interesting finding because SRS facilities are more available in private setups than government institutions. The reason may be that academic environment is fostered relatively more in the latter which promotes interest in such survey studies. Geographically, there was not much variation in response rate, except from Eastern India which is because more ROs were personally known to the authors. Work tier did not influence the response rate much which is a sign that interest with SRS is quite unanimous. Relatively less (<5 years) experienced personnel responded more than others (5–10 years and >10 years). This may be due to multiple factors like younger generations were more enthusiastic than others, apathy, or bias against newer treatment modalities in more experienced personnel probably due to lack of long-term data on SRS, etc.

About 25.3% (24) respondents have 10–30 BM cases/month in their radiotherapy department. 37.9% (36) have 30–100 cases and 36.8% (35) have >100 BM cases/month in their department. As for the incidence of BM, most (74.7%, 71) centers had >30 cases of BM/month.

Nearly 26% centers had SRS facility which shows that most of our centers depend on neurosurgeons for treating SRS suitable BM too. However, as stated in beginning, 2012 statistics of AERB showed only 10% centers equipped with SRS facility. Hence, nearly 2.5-fold increase over the last 5 years proves the rapidly increasing popularity of SRS in India. More than one-third of respondents had no experience with SRS and about 13% ROs had significant (>5 years) experience. This again reflects the dearth of adequate training of ROs in SRS. Most of the respondents practicing SRS preferred linear accelerators (LAs) with frame as they are most commonly available in most centers. Dedicated gamma knife centers for stereotactic radiotherapy are infrequently present in India, so preference of the same was limited to only 13% respondents. Planning for SRS is quite time-consuming all though it is a one time job. Lack of training and infrastructure may have contributed to a nearly fivefold increase in time consumption as compared to WBRT planning in most SRS centers.

Coming to treatment for oligometastases (<4), most ROs picked on addition of SRS to WBRT as their preferred choice. Local control and overall survival were voted to be the most important outcomes deciding the use of this combination therapy. On the other hand, the choice of WBRT vs. SRS was decided more by age and performance status than status of primary (controlled or progressing) and least by its histology. WBRT was the obvious choice for multiple (>5) metastases foci in >90% respondents. This practice pattern for oligomets is in line with the conclusions of the major RCTs on SRS.[16],[17],[18],[19] Stockholm et al. conducted a similar survey to explore the practice patterns among ROs of USA for management of intracranial necrosis post SRS.[25] Although the study aim was different, there are two major similarities with our study – most of the respondents were from academic centers and most of them used LINAC-based SRS systems.

To sum up, our study reflects the eagerness with which ROs have incorporated SRS in their clinical practice notwithstanding the significantly unmet needs for SRS training and facilities in India. The infrastructural deficit can be addressed by government funding along with financial aid from international organizations such as IAEA (International Atomic Energy Agency). International collaboration on SRS training can help in technical training of ROs. Personnel exchange program, fellowships, workshops, sharing of institutional evidence on SRS can be of significant impact in this regard. All such steps will improve the awareness on SRS and motivate our ROs to enrich their experience on the same.


  Conclusions Top


Major discordance exists between practice patterns and views on SRS use among RO in India. Majority do not practice SRS due to lack of facilities.

This is probably the first study on practice patterns of SRS in India if not the world. This will enlighten the perception of ROs on SRS. The information presented here can be used for discussion with neurosurgeons to build a SRS consortium in the near future. Such a consortium can chalk out policies on SRS and maintain a database for audit and formulating guidelines.

Acknowledgment

We are thankful to all faculty members of Radiotherapy Department of Medica Cancer Hospital, Siliguri and R. G. Kar Medical College and Hospital, Kolkata, for their support. We also acknowledge all the respondents of this survey. We are also thankful to the management of Medica Cancer Hospital, Siliguri, for the financial support.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
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