Clinical trial NCT05316103: Targeted Optical Biopsy for Local Rectal Scars in Rectal Cancer Patients After Neoadjuvant Chemoradiotherapy
Official title: Use of Probe-based Confocal Laser Endomicroscopy to Perform Targeted Optical Biopsy for Local Rectal Scars in Rectal Cancer Patients After Neoadjuvant Chemoradiotherapy
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: NA
Conditions: Rectal Cancer
Keywords: rectal cancer
confocal laser endomicroscopy
optical biopsy
Lead sponsor: Nanfang Hospital, Southern Medical University
Sponsor class: OTHER
First posted: 2022-04-07
Enrollment: 68
Sex: ALL
Minimum age (years): 18
Maximum age (years): 80
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: DIAGNOSTIC

Brief summary: Currently, low concordance (36%) is found between clinical complete response and pathologic complete response in patients with rectal cancer after neoadjuvant chemoradiotherapy. Probe-based confocal laser endoscopy (pCLE) provides a promising targeted optical biopsy to evaluate the response to neoadjuvant chemoradiotherapy. The aim of this study is to investigate whether pCLE-targeted optical biopsy can improve the accuracy of preoperative endoscopic biopsy for local rectal scars in rectal cancer patients after neoadjuvant chemoradiotherapy.

Detailed description: Patients with locally advanced rectal cancer can benefit from neoadjuvant chemoradiotherapy, and 20%-30% of patients receiving such therapy can attain a pathologic complete response, defined as the eradication of cancer cells. For those who reach pathologic complete response, a watch-and-wait strategy is supposed to be the best choice. However, low concordance (36%) was found between clinical complete response and pathologic complete response in patients with rectal cancer after neoadjuvant chemoradiotherapy. There is a compelling need to improve the consistency.

Probed-based confocal laser endoscopy (pCLE) is a novel endoscopic adjunct that allows real-time in vivo histological examination of mucosal surfaces. By using intravenous fluorescent agents, pCLE highlights certain mucosal elements that facilitate an optical biopsy in real time. It provides a promising targeted optical biopsy for local rectal scars in rectal cancer patients after neoadjuvant chemoradiotherapy.

The investigators perform this study to investigate whether pCLE-targeted optical biopsy could improve the accuracy of preoperative endoscopic biopsy for local rectal scars in rectal cancer patients after neoadjuvant chemoradiotherapy. In this study, rectal cancer patients after neoadjuvant chemoradiotherapy will be successively arranged to accept traditional endoscopic biopsy and pCLE-based targeted optical biopsy. The consistency rate will be calculated according to the postoperative pathological results.

Eligibility criteria: Inclusion Criteria:

1. Age from over 18 to under 80 years
2. American Society of Anesthesiology(ASA) score class I,II,or III
3. Locally advanced rectal cancer
4. Patient has completed standard neoadjuvant therapy
5. Expected surgical resection
6. Written informed consent

Exclusion Criteria:

1. Pregnant or lactating women
2. Acute renal insufficiency or stage II to IV chronic renal insufficiency
3. Patients with allergic constitution

Primary outcomes:
measure: Accuracy of pCLE-targeted optical biopsy
timeFrame: 7 days
Secondary outcomes:
measure: Sensitivity,specificity,positive predictive value and negative predictive value of pCLE targeted optical biopsy
timeFrame: 7 days
measure: Complications of biopsy
timeFrame: 7 days
Other outcomes:
Locations:
city: Guangzhou
country: China
facility: Nanfang Hospital, Southern Medical University
state: Guangdong
Study officials:
affiliation: Nanfang Hospital, Southern Medical University
name: Jun Yan, M.D., Ph.D.
role: PRINCIPAL_INVESTIGATOR
References:
citation: Gash KJ, Baser O, Kiran RP. Factors associated with degree of tumour response to neo-adjuvant radiotherapy in rectal cancer and subsequent corresponding outcomes. Eur J Surg Oncol. 2017 Nov;43(11):2052-2059. doi: 10.1016/j.ejso.2017.07.024. Epub 2017 Aug 10.
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citation: Safatle-Ribeiro AV, Marques CFS, Pires C, Arraes L, Baba ER, Meirelles L, Kawaguti FS, da Costa Martins B, Lenz LT, de Lima MS, Gusmon-Oliveira CC, Ribeiro U Jr, Maluf-Filho F, Nahas SC. Diagnosis of Clinical Complete Response by Probe-Based Confocal Laser Endomicroscopy (pCLE) After Chemoradiation for Advanced Rectal Cancer. J Gastrointest Surg. 2021 Feb;25(2):357-368. doi: 10.1007/s11605-020-04878-y. Epub 2021 Jan 14.