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 Table of Contents  
LETTER TO EDITOR
Year : 2018  |  Volume : 7  |  Issue : 2  |  Page : 135-136

EUS -guided liquid fiducial placement for stereotactic radiotherapy in pancreatic cancer: Feasibility study


1 Department of Internal Medicine, Mount Sinai Medical Center Miami Beach, Florida, USA
2 Department of Radiation Oncology, Mount Sinai Medical Center Miami Beach, Florida, USA
3 Department of Gastroenterology, Mount Sinai Medical Center Miami Beach, Florida, USA

Date of Submission16-Jul-2017
Date of Acceptance05-Nov-2017
Date of Web Publication12-Mar-2018

Correspondence Address:
Dr. Vivian Ussui
Mount Sinai Medical Center, Miami, Florida
USA
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/eus.eus_98_17

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How to cite this article:
Ussui V, Kuritzky N, Berzosa M. EUS -guided liquid fiducial placement for stereotactic radiotherapy in pancreatic cancer: Feasibility study. Endosc Ultrasound 2018;7:135-6

How to cite this URL:
Ussui V, Kuritzky N, Berzosa M. EUS -guided liquid fiducial placement for stereotactic radiotherapy in pancreatic cancer: Feasibility study. Endosc Ultrasound [serial online] 2018 [cited 2019 Nov 15];7:135-6. Available from: http://www.eusjournal.com/text.asp?2018/7/2/135/227155



Dear Editor,

For patients with unresectable pancreatic tumors, stereotactic body radiation therapy (SBRT) has shown promising results for local control with reduced toxicity.[1] Fiducials are used in SBRT to allow better localization of the tumor for adequate mapping. Despite the high success rates with metal fiducials,[2] its placement can be technically difficult, particularly with lesions located in the head or uncinate process, and when the scope is torqued. Metal fiducials have limited visibility given their small size, requiring multiple fiducials for a single location, cannot be removed, and have high migration rates.[3] Recent Food and Drug Administration approval of fiducial preloaded needles has overcome safety concerns when backloading fiducials into standard needles, allowing deployment of 1–3 fiducials per endoscopic passage.

A new injectable hydrogel made of iodinated polyethylene glycol particles (TraceIT Fiducial Marker, Augmenix Inc., Waltham, MA, USA) has been approved and used as a liquid fiducial on solid tumors.[4] It is reabsorbable, has multimodal visibility, and can be easily injected through small needles into advanced cancer and surrounding soft tissue.[5]

We recently reported (Poster Mo1992, presented at Digestive Disease Week 2016; San Diego, CA. Published at Gastrointestinal Endoscopy 2016, vol 83 (5): AB486-87) two patients with locally advanced pancreatic cancer, who were deemed not surgical candidates due to vascular involvement and performance status. Both patients underwent hydrogel fiducial placement for palliative SBRT. Procedures were performed under moderate sedation using a linear echoendoscope (GF-UCT180, Olympus, Japan).

A 19-gauge standard needle was first primed with the injectable hydrogel marker outside the echoendoscope. The hydrogel was injected in aliquots of 0.1–0.2 cc at a time without repositioning the needle until there was a clear endosonographic visualization of hydrogel blebs within the tumor. The hydrogel appeared hyperechoic on endoscopic ultrasound (EUS) imaging [Figure 1]. Although not visible on fluoroscopy, the hydrogel exhibits hyperenhancement on T2-weighted magnetic resonance imaging and reveals radiopacity of approximately 300 Hounsfield units on simulation with computed tomography (CT) imaging and cone-beam CT. All patients received periprocedural prophylactic antibiotics. No major complications were noted. The liquid fiducial allowed adequate radiation simulation, including motion studies. Onboard imaging during radiation treatment with cone-beam CT visualized the implanted hydrogel marker allowing real-time registration of images and accurate targeting of the tumor. Both patients successfully received a total of 33 Gray (Gy) under SBRT protocol.
Figure 1: Adenocarcinoma of the head of pancreas after injection of hydrogel. Noticed hyperechoic features of the hydrogel within the mass

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EUS-guided delivery of a new liquid fiducial into pancreatic cancer appears to be feasible, providing adequate visualization of the marker during EUS placement and most importantly during mapping and image guidance during stereotactic radiotherapy. Compared to metal fiducials, it appears to have less artifact on cone-beam pretreatment mapping, it can be delivered with smaller gauge needles, and with one single puncture, the targeted area can be completely delineated with just needle repositioning within the tumor. This novel hydrogel fiducial can become an alternative to metal fiducial to aid on SBRT. Further studies are necessary to assess long-term outcomes, safety, and cost, particularly when compared to standard metal fiducials.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

1.
Higuera O, Ghanem I, Nasimi R, et al. Management of pancreatic cancer in the elderly. World J Gastroenterol 2016;22:764-75.  Back to cited text no. 1
[PUBMED]    
2.
Varadarajulu S, Trevino JM, Shen S, et al. The use of endoscopic ultrasound-guided gold markers in image-guided radiation therapy of pancreatic cancers: A case series. Endoscopy 2010;42:423-5.  Back to cited text no. 2
[PUBMED]    
3.
Khashab MA, Kim KJ, Tryggestad EJ, et al. Comparative analysis of traditional and coiled fiducials implanted during EUS for pancreatic cancer patients receiving stereotactic body radiation therapy. Gastrointest Endosc 2012;76:962-71.  Back to cited text no. 3
[PUBMED]    
4.
Machiels M, van Hooft J, Jin P, et al. Endoscopy/EUS-guided fiducial marker placement in patients with esophageal cancer: A comparative analysis of 3 types of markers. Gastrointest Endosc 2015;82:641-9.  Back to cited text no. 4
[PUBMED]    
5.
Blumencranz PW, Ellis D, Barlowe K. Use of hydrogel breast biopsy tissue markers reduces the need for wire localization. Ann Surg Oncol 2014;21:3273-7.  Back to cited text no. 5
[PUBMED]    


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