Extended Field Postoperative Radiotherapy (EFRT) Yields better Outcomes as Compared to Localised Field RT (LFRT) in Radically Resected Gallbladder Cancer (GBC)

  1. Sushma Agrawal ,
  2. Rajan Saxena

Vol 5 No 4 (2020)

DOI 10.31557/apjcc.2020.5.4.287-293


Background: Postoperative adjuvant RT is recommended in node positive and positive resection margins patients after radical surgery (RS) in GBC. However there are no guidelines to suggest the regions to be irradiated. Our aim is to compare whether EFRT or LFRT improves outcomes.
Methods and Materials: Records of GBC patients who underwent adjuvant chemo-radiotherapy after RS, between January 2007 and December 2014 were reviewed. Demographic data, histopathological data, target delineation, RT treatment planning details, concurrent chemotherapy, side-effects of treatment, and survival data were collated. Patients were treated with either of two techniques: Localised field RT [LFRT] [from 2007-2010] or Extended field RT [EFRT] [from 2011-2014] along with concurrent 5-FU/capecitabine. LFRT involved RT to GB bed, peri-portal, common hepatic artery (CHA) and coeliac lymph nodes and EFRT involved RT to GB bed, peri-portal, CHA, coeliac, gastro-duodenal, superior mesenteric and para aortic lymph nodes. The RT dose was 50.4 Gy/28fractions/5.5 weeks. Loco-regional recurrence rate (LRR), Overall (OS) and Disease free Survival (DFS) was computed with Kaplan Meier method.
Results: Out of 60 patients reviewed, 30 were treated with EFRT and 30 with LFRT. There was no significant difference in the acute and late side-effects between the two techniques. At a median follow-up of 44 months (range 36-120 months), 37.5 % patients developed LRR (13.3 % vs 40% in EFRT and LFRT, p = NS).The median OS was not reached (NR) vs 42 months and the median DFS was NR vs 30 months in EFRT vs LFRT respectively (p=0.01 and 0.016). The 5 year OS was 80% vs 42% and 5 year DFS was 80% vs 40% for EFRT and LFRT respectively (p=0.01 and 0.016).
Conclusions: Based on our findings, we conclude that EFRT reduces LRR and improves survival in patients with absence of lymphovascular space invasion (LVI) and perineural invasion (PNI). This observation is hypothesis generating and merits validation in a randomised study.


GBC has a poor prognosis due to its highly aggressive behaviour, with only 10% cases presenting as resectable disease [1]. Radical surgery (RS) is the standard of care. Loco-regional recurrence (LRR) after RS has been reported in the hepatic hilum, bilio-enteric anastomosis, liver resection margins and retro-portal lymph nodes [2]. To prevent recurrences, adjuvant chemo-radiotherapy is advocated in node positive, resection margin positivity (R1) and high risk features like lympho-vascular invasion and poorly differentiated tumours[3-5]. LRR are 40% versus 64% with or without radiotherapy [3]. Hence adequate clinical target volume (CTV) definition for postoperative radiotherapy, with quality control is essential to avoid recurrences in this disease with high mortality.

Presently no guidelines are available for CTV delineation in post-operative patients. The available literature documents variable target volumes which ranges from inclusion of gallbladder bed and regional lymph nodes (peri-portal, celiac, pancreatico-duodenal with or without para aortic nodes) to whole abdomen irradiation with a boost to the tumour bed [6-8]. LRR with irradiation of para aortic nodes is 16% versus 27% when para aortic nodes were not irradiated and 34 % with whole abdominal irradiation [6-7-9]. Recently a systematic review of surgical-pathological series on GBC, reported that the incidence of various lymph-node station involvement in GBC is 25% (peri-choledochal), 23% along cystic duct, 17% (retro-portal lymph nodes), 15.8% along common hepatic artery, 13.4%, along the hepatoduodenal ligament, 12.3% retro-pancreatic nodes, 7.7% anterior and posterior pancreaticoduodenal nodes, 6% para-aortic and 5.1% for hilar lymph nodes. They suggested that these lymph-node groups should be irradiated in GBC [10].

With a view to get clarity on the extent of lymph node (LN) irradiation required, we reviewed our departmental data of postoperative GBC patients who received chemo- radiation (CTRT) during the period 2007-2014. Localised field RT (LFRT, Figure1)) [practised from 2007-2010] was one where the target volume included GB bed and LN (along peri-portal, common-hepatic artery, coeliac artery: abdominal LN stations 5, 6, 9 and 12). Extended field (EFRT, Figure 1) [practised from 2011-2014] was one where the target volume also included the superior mesenteric artery and pre and para-aortic nodes (abdominal LN station 5, 6, 8, 9, 12, 13, 16) in addition to LFRT. In the absence of any delineation guidelines for GBC, EFRT was initiated in the department in 2011, after the availability of RTOG Atlas for target volume delineation in pancreatic cancers [11].

Figure 1: LFRT (black box): Includes Postoperative GB bed, Peri-portal, Common Hepatic Artery and Coeliac lymph-nodes, EFRT (black + red box): Postoperative GB bed, Peri-portal, Common Hepatic Artery, Coeliac, retro-pancreatic Nodes, Anterior and Posterior Pancreatico-duodenal Nodes, and Para-aortic Lymph-nodes.

Materials and Methods

After SGPGI institutional ethics committee approval, the records of GBC patients who received CTRT after RS (January 2007 and December 2014) were retrospectively reviewed. The need for informed consent was waived off by the ethics committee. All methods were performed in accordance with the relevant guidelines and regulations. Demographic and histopathological data, CTV, treatment planning data, concurrent chemotherapy, side-effects of treatment, and survival data were retrieved. Follow-up status was updated in December 2018. The following procedure was followed for simulation, target volume delineation, planning and RT delivery:


Patients were simulated on a wing board and a free breathing CECT of whole abdomen (from T6 to L5) with 100 ml oral contrast, at 5 mm slice thickness (on Somatom Sensation Open CT scanner, M/s Siemens Medical System, Germany). This data was imported into the treatment planning system (Eclipse).

Target volume (TV) delineation

TV were defined according to ICRU report 62 for the two techniques.

Clinical TV (CTV) was derived by merging clinical target volume of GB bed (CTV_GB) and lymph nodes (CTV_LN).

CTV_GB included the hypo-density in the excised gallbladder bed (with clips if available) taking into consideration the preoperative tumour extent and 0.5 cm margin around it.

CTV_LN (LFRT): included abdominal LN station 5, 6,9,12 (LFRT, Figure (2) b).

CTV_LN (EFRT) (Figure 2a): included abdominal LN station 5, 6,8,9,12,13 and 16

Figure 2: a, Clinical Target Volume (CTV) and Planning Target Volume (PTV) in Extended Field RT (EFRT) in Axial, Sagittal and Coronal View; b, Clinical target volume (CTV) and planning target volume (PTV) in localised field RT (LFRT) in axial, sagittal and coronal view.

-Attempt was made to identify and include the choledocho-jejunal anastomosis, and segment IV b of liver in the CTV, because of chances of microscopic spread of GBC in segment IVb of liver.

Planning target volume (PTV) was 1 cm expansion around CTV in all directions except raniocaudally (1.5 cm to account for respiratory motion) and 7 mm posteriorly.

Organs at risk (OAR): included liver, bilateral kidneys and spinal cord.

Three- Dimensional Conformal Radiotherapy (3DCRT) planning

PTV was treated with coplanar 3D conformal fields shaped to deliver the specified dose using a combination of 6 and 15 MV X-rays. The prescribed dose of radiotherapy to a reference point within the PTV was 50.4 Gy in 28 fractions. The treatment plan used for each patient was based on an analysis of the volumetric dose of the PTV and OAR. Normal tissue constraints were 18 Gy (median dose) for both kidneys, 30 Gy (mean liver dose) and 45 Gy (maximum spinal cord dose). Portal image of orthogonal images that localized the isocentre of planned beams was obtained on the first day of treatment only and any disparity more than the tolerance limit of 5 mm was corrected.

Concurrent 5-fluorouracil (cCRT: concurrent chemo radiation) was administered as a bolus of 500 mg, day 1-3 and day 29-32 (3 successive days during Week 1and 5 of RT) as tolerated. If the first cycle resulted in grade 3 diarrhoea then the dose was reduced by 10% in the next cycle. Side-effects due to concurrent chemo-radiotherapy were recorded according to CTCAE-v 3.


Follow-up was done by clinical examination and ultrasound whole abdomen, 3 monthly for 2 years and thereafter 6 monthly. LRR was defined as recurrence in the GB bed and regional lymph nodes. Distant metastases (DM) was defined as recurrence in distant organs. Any evidence of LRR or DM was confirmed by CECT abdomen and fine needle aspiration cytology. Overall survival (OS) and disease-free survival (DFS) were estimated using Kaplan-Meier method using SPSS v 15.


The demographic characteristics of patients (n=60) were: median age 53 years (range 27-77 yrs.), 18 males (30%) and 42 females (70%), stage II: 5 (11.1%), IIIa: 11 (24.4%), IIIb: 26 (57.8%), stage IV: 3(6.6%) (Table 1).

Table 1: Patient Characteristics.

Clinical and treatment characteristics Localised field (LFRT) Extended field (EFRT)
N=30, % N=30, %
Age in median (IQR) 52 (42-57) 54 (41-70)
Sex (female) 27:73 34:66
Surgical technique (%)
Extended cholecystectomy 20 (66.7) 30 (100)
Cholecystectomy with hepatectomy 7 (23.3) -
Cholecystectomy with Hepato-pancreaticoduodenectomy 3 (10) -
T status (%)
1 1 (3.3) -
2 16 (53.3) 12 (40)
3 13 (43.3) 16 (53.3)
4 - 2 (6.7)
N status (%)
0 8 (26.7) 10 (33.3)
1 17 (56.7) 8 (26.7)
2 5 (16.7) 12 (40)
Stage group (%)
1 1 (3.3) -
2 3 (10) 2 (6.7)
3 26 (86.7) 20 (66.7)
4 - 8 (26.7)
Grade (%)
WD 22 (73.3) 18 (60)
PD 8 (27.3) 12 (40)
Resection status (%)
R0 13 (43.3) 16 (53.3)
R1 17 (56.7) 14 (46.7)
LVI (%) 5 (16.7) 0
PNI (%) 4 (13.3) 0

Forty-eight patients (80 %) underwent extended cholecystectomy (EC), nine (15 %) underwent EC with right hepatectomy and lymphadenectomy and three (5 %) underwent EC with pancreato-duodenectomy. 30 patients were treated with LFRT (2007-2010) and 30 with EFRT (2011-2014).The demographic features and tumour and treatment related factors were well balanced in both the arms. The median radiotherapy dose was 50.4 Gy (range 45Gy – 50.4 Gy). 2 patients could not tolerate concurrent 5-FU, hence the second cycle of 5-FU was not given subsequently. Those who were elderly (age > 70 years were not offered concurrent chemotherapy, n=3).

10% and 15% patients experienced grade 2 emesis and dyspepsia in LFRT and EFRT respectively. Though grade 3 acute toxicity was not seen during treatment, 2 patients died, one due to subacute intestinal obstruction 6 months following treatment due to local recurrence and in second the cause of death could not be ascertained. No grade 3 late morbidity was reported till the time of last follow-up.

The median follow up for all patients was 44 months (IQR 36 – 120 months) and 68 months for those alive (36-120 months).Ten percent patients (6/60) were lost to follow-up. There was significant difference in median overall and disease free survival time between the two groups. The 5 year overall survival (OS) rates was 80% and 42% for EFRT and LFRT respectively (p=0.01, Table 2, Figure 3 (a)).

Table 2: Local Recurrence and Survival in LFRT and EFRT.

Outcomes Localised field (n=30) Extended field (n=30) p-value
#Overall survival (in months) 34 (4-64) NR 0.03
#Disease free survival (in months) 25 (11-50) NR 0.03
Local recurrence 12 (40 %) 4 (13.3 %) 0.18
Distant metastases 8 (26.7%) 0 (0%) 0.01

#Data presented in median (IQR), compared by Log rank test

The 5 year disease free survival (DFS) was 80 % and 40% for EFRT and LFRT respectively (p=0.01, Figure 3 (b)).

Figure 3: a, Overall Survival with LFRT and EFRT; b, Disease Free Survival with LFRT and EFRT.

This benefit was seen irrespective of resection and nodal status. Overall 37.5 % (16/60) patients developed recurrence (13.3 % vs 40% in EFRT and LFRT). While 80% of patients with LRR in LFRT had R1 and node positive disease, both patients with LRR in EFRT had R1 disease and one was lost to follow-up. The incidence of distant metastases (DM) was 26.6 % in LFRT and 0 % in EFRT.


Our results demonstrate that irradiation of para-aortic lymph nodes improves LRR, DFS and OS irrespective of the resection and nodal status. Though patient numbers are small, the improvement in survival rates are optimistic and suggests inclusion of para-aortic node in all patients of GBC after RS. This also reiterates the fact that careful and consistent CTV delineation resulted in decrease of LRR rates from 40% in LFRT to 13 % in EFRT. Our results also suggest that better LRR results in decrease in DM rates. The GBC audit of National Cancer Database of 4775 patients showed only early survival benefit (3 year OS of 39.9%) in patients who received CTRT as compared to those who did not (3 year OS of 6.8%). The authors contested that the poor outcome was due to the inclusion of a mixed bag of patients (in-adequate surgery [simple/ partial cholecystectomy: 26.4%] and adequate surgery [total cholecystectomy: 27.1%]) and that the benefit of adjuvant therapy should be assessed only in patients who have undergone RS [3]. Our data shows that with EFRT the 5 year OS rose to 80% and this benefit is sustainable. In a multi-institutional audit of adjuvant CTRT (EFRT) in GBC patients (in those with node positive, high grade and LVI), the 5 year OS was 44.9% [4]. Based on the absence of late morbidity in liver, kidney and small bowel, irradiation of para-aortic nodes seems to be safe.

Our study emphasizes that standardisation of CTV delineation improves local control. Poor LRR with LFRT was due to non-inclusion of superior mesenteric nodes, para-aortic nodes, due to lack of availability of guidelines at that time. With availability of RTOG guidelines for postoperative pancreatic cancers, we adopted similar LN-CTV delineation volumes in GBC. We propose to draw two clinical target volumes, the GB bed (CTV_GB) and the lymphatic CTV (CTV_LN) and then merge both the volumes to form the CTV. Based on the fact that GBC spreads by direct infiltration to adjacent liver segments IV and V (34-83%), the cystic duct, hepatico – choledochal duct (6-57%) and the peritoneum of the hepatoduodenal ligament, these structures should be included along with clips at the liver resection margin (if available) to form the CTV_GB [12]. The role of surgical clips in aiding CTV delineation for postoperative GBC is not available in literature, but it is intuitive that it will improve the accuracy of CTV delineation as seen in other tumors. The number, site and type of clips to be inserted (to differentiate from haemostatic clips) needs to be standardised. The preoperative CT scans should be fused with the simulation scans, but it is not routinely advocated because the postoperative anatomy varies considerably from preoperative anatomy, the preoperative imaging is not obtained on a flat table or with appropriate patient positioning, the imaging sets may have been obtained in different phases of respiration, and there may be significant change in weight and body habitus after RS. Since no histopathological studies of microscopic spread are available in the literature for GBC, an arbitrary 0.5 cm margin was given around the above target volume to form CTV_GB.

To delineate the CTV_LN, familiarity with lymphatic dissemination is essential. The lymphatic spread in GBC cancers follows an intrahepatic and an extrahepatic path. The intrahepatic spread occurs along lymph vessels in adjacent liver segments IV and V towards the lymphatic tissue in liver hilum and the hepatoduodenal ligament lymphatics. The extrahepatic lymphatic spread follows the sub-serosal lymphatic tissue of the gallbladder and the cystic duct to the hepatoduodenal and pancreato- duodenal lymphatics (lymph-node stations 8, 9 and 12). The hepatoduodenal lymphatic network drains to the superior, anterior and posterior pancreato-duodenal lymph nodes, aorto – caval nodes near the left renal vein, superior mesenteric artery, nodes along the hepatic artery and coeliac trunk (lymph-node stations 5,6,13 and 16) [13]. Hence all the above LN stations were included and merged with CTV_GB bed to form the CTV in EFRT. The altas for CTV definition for locally advanced GBC published this year also suggests similar target volumes [14].

A PTV margin of 1 cm (except cranio-caudal margin of 1.5 cm for respiratory motion and 7mm posteriorly) was given to account for setup errors based on our departmental data on chest tumours positioned on a wing board [15]. Due to lack of facility of 4D-CT, individual respiratory motion could not be accounted for though data from 4D CT in liver stereotactic treatment does reveal that compared to conventional PTV, the use of 4D CT-based PTVs with individual margins significantly reduces normal tissues being unnecessarily irradiated and also contributes to reducing the risk of missing targets for tumours with large motion [16-17].

Our findings validates the suggestions of the systematic pathologic analysis for inclusion of abdominal LN station 5,6,8,9,12,13,16 for TV delineation in GBC, as it has shown better outcome [10]. In the absence of any randomised study comparing LFRT and EFRT, we suggest that EFRT can be practiced to achieve low LRR and DM rates. Since resectable GBC are only 10% of the GBC patients presenting in clinic, conducting a randomised study to compare both the techniques is difficult because of likelihood of low accrual.

The limitations of our study is the small sample size which can be explained by the rarity of early stage GBC presentation. The sample size explains the demographic and clinical differences between the two groups. Propensity score analysis to account for these differences was not undertaken due to the small sample size. Though literature suggests the lymph-node stations to be irradiated for biliary cancers, outcomes with RT based on localised and extended field RT is not available in the literature in this disease with high mortality.

In conclusions, based on our findings, we conclude that EFRT reduces LRR and improves survival in patients with absence of lympho-vascular space invasion (LVI) and peri-neural invasion (PNI). This observation is hypothesis generating. A prospective randomized trial with EFRT is desirable to validate our observations.


Not applicable.

Authors’ contributions:

All authors read and approved the final manuscript



Availability of data and materials

Datasets used and/or analyzed in the current study are available from the corresponding author on reasonable request.

Ethics approval and consent to participate

Institutional Ethics Committee.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.


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© Asian Pacific Journal of Cancer Care , 2021

Author Details

Sushma Agrawal
Sanjay Gandhi Postgraduate Institute of Medical Sciences

Rajan Saxena
<p>Professor and Head of Department</p> <p>Department of Surgical Gastroenterology</p>
Sanjay Gandhi Postgraduate Institute of Medical Sciences

How to Cite

Agrawal, S., & Saxena, R. (2020). Extended Field Postoperative Radiotherapy (EFRT) Yields better Outcomes as Compared to Localised Field RT (LFRT) in Radically Resected Gallbladder Cancer (GBC). Asian Pacific Journal of Cancer Care, 5(4), 287-293. https://doi.org/10.31557/apjcc.2020.5.4.287-293
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