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This is a phase I, dose-escalation study to evaluate the safety of endorectal brachytherapy with concurrent capecitabine or 5-fluoruracil (5-FU) in the management of locally recurrent/residual rectal or anal cancer in patients who have received pelvic external beam radiation therapy (EBRT) +/- chemotherapy. We will use magnetic resonance imaging (MRI) with dynamic contrast enhancement (DCE) and diffusion weighted imaging (DWI) series to contribute to the assessment of tumor response.

Patients will receive 3 fractions of endorectal brachytherapy, each spaced apart by 7 days (+/- 1 day). The three dose tiers will be 1500cGy (500cGy per fraction), 1800cGy (600cGy per fraction), and 2100cGy (700cGy per fraction).

endorectal brachytherapy

Patients will receive 500 mg and 150 mg oral tablets of capecitabine for the prescribed dose of 825 mg/m2 BID, morning and evening (total daily dose of 1650 mg/m2 ). Dosages will be rounded to the nearest 150 mg or 500 mg. Tablets should be swallowed with water within 30 minutes after a meal. Capecitabine will be started on the Monday of the first week of brachytherapy (day 1) and taken on weekdays (Monday through Friday) during weeks of brachytherapy only.

Administration of 5-FU should be only by the intravenous route taking care to avoid extravasation. Patients will receive 225 mg/m2/day, as a continuous venous infusion by a portable pump for the 3 weeks of treatment. The infusional 5-FU will be exchanged every 7 days.

concurrent capecitabine or 5-FU

Patients should complete the 2 quality of life questionnaires during their follow-up appointments. If they are unable to be seen in follow-up, they may complete the questionnaires at home and email or mail them back to the investigator. Should there be any incomplete or ambiguous answers, a follow-up phone call will be made by a member of the research team for clarification. Additionally, if the questionnaires have not been returned within 3 weeks after the time when they are due, a member of the research team will call the patient, and the questions will be completed over the phone.

Questionnaires

Abraham Wu, MD

The purpose of this study is to see what amount of radiation is safe to give to rectal or anal cancer patients who are being treated with a procedure called brachytherapy.

Dose Escalation Trial of Endoluminal High-Dose-Rate Brachytherapy With Concurrent Chemotherapy for Rectal or Anal Cancer in Patients With Recurrent Disease or Undergoing Non-Operative Management

A Phase I, Dose Escalation Trial of Endoluminal High Dose Rate Brachytherapy With Concurrent Chemotherapy for Rectal or Anal Cancer in Patients With Recurrent Disease or Undergoing Non-Operative Management

will employ a standard 3+3 dose-escalation scheme. Patients will be accrued to the study in cohorts of 3. An initial cohort of 3 patients will be treated to each dose. The dose level will be escalated if none of the 3 patients exhibits any DLT within 90 days of completion of brachytherapy. Dose escalation will not take place until every patient in the prior dose cohort has been monitored for 90 days.

MRI with DCE \& DWI (unless contraindicated) after brachytherapy

Memorial Sloan Kettering Cancer Center

Carcinoma

Endorectal brachytherapy : 30 Gy in 3 sessions of 10 Gy delivered weekly

Endorectal brachytherapy

Véronique VENDRELY

Bénédicte DURAND

The management of rectal cancers has changed over the past decades towards a multidisciplinary strategy, combining radiotherapy, chemotherapy, and surgery. Local recurrence rates, dropped to less than 6 % with pre-operative radiotherapy and the standardization of total mesorectal excision (TME), at the price of increased peri-operative morbidity and functional sequelae. Since neoadjuvant treatment achieves up to 30 % complete response, organ preservation has been increasingly debated for good responders. With the introduction of better-quality imaging for tumour visualization and treatment planning, a new targeted radiation treatment was introduced with high dose rate endorectal brachytherapy (HDRBT), developped by Dr Te Vuong's team in Montreal. This treatment allows for radiotherapy dose escalation to increase the complete response rate, and subsequently the rate of patients amenable to rectal preservation. This phase 2 trial study is proposed to assess the feasibility of HDR brachytherapy after standard chemoradiotherapy among patients selected for rectal preservation.

The standard treatment for locally advanced rectal cancer consists in chemoradiotherapy followed by radical surgery with total mesorectal excision (TME) and adjuvant chemotherapy depending on lymph node status. This radiosurgical strategy has reduced local recurrence rates to less than 5% in expert centers, but at the cost of 20-30% morbidity and functional sequelae. Chemoradiotherapy can sterilize 15% of tumors, and up to 30% when neoadjuvant chemotherapy is given, calling into question the usefulness of systematic radical surgery in good responders. Ongoing trials are looking at treatment intensification either by chemotherapy intensification or by dose escalation in radiotherapy, with the aim of increasing the rectal preservation rate. Endorectal brachytherapy, developed by Prof. Té Vuong in Montreal, makes it possible to deliver a complementary dose directly to the tumor using a high-activity Iridium-192 radioactive source. It is an ambulatory treatment, which allows to deliver a complementary dose of 30 Gy in 3 sessions of 10 Gy at one week interval after external radiotherapy.

The objective of our trial is to demonstrate the feasibility of rectal brachytherapy for our patients in France with an acceptable toxicity rate similar to that described by the Canadian teams. In addition, this bicentric trial will allow to prove capacity to train radiotherapist colleagues in the technique of endorectal brachytherapy, which is an essential prerequisite for the development of the technique throughout France.

Main objective : To assess the feasibility of endorectal brachytherapy in patients showing partial response after standard neoadjuvant therapy with a goal of rectal preservation.

Secondary objectives: To describe the potential efficacy of endorectal brachytherapy in patients with partial response after standard neoadjuvant therapy by the complete clinical response rate and complete radiological response rate on MRI at 8 weeks, 4 months, 8 months, and 1 year, local recurrence rate, recurrence-free survival, and overall survival at 1 year Describe the rate of curative surgery (R0) in case of recurrence as well as the surgical morbidity according to the Dindo-Clavien score at 3 months after surgery.

Endorectal Brachytherapy for Rectal Cancer

Endorectal Brachytherapy for Dose Escalation in Rectal Preservation Treatment of Rectal Cancer (ICUREC)

Proportion of patients receiving the 3 brachytherapy sessions without acute grade 3 proctitis (requiring hospitalization or transfusion) within 8 weeks after the end of treatment

Proportion of patients with a complete clinical response

Proportion of patients with a complete radiological response on MRI

Proportion of patients with a local recurrence up to 1 year

The scores of questionnaire QLQ C-30 will be examined. The EORTC QLQ-C30 is a patients self-rating questionnaire that measures physical, role, social, emotional, and cognitive functions as well as overall QoL. Scores can be linearly transformed to provide a score from 0 to 100. Higher scores represent better functioning on the functional scales and a higher level of symptoms of the symptom scales

The scores of questionnaire QLQ CR-29 will be examined. The EORTC QLQ-CR29 has five functional and 18 symptom scales. Scores can be linearly transformed to provide a score from 0 to 100. Higher scores represent better functioning on the functional scales and a higher level of symptoms of the symptom scales

The LARS questionnaire (low anterior resection score) evaluates bowel function. Five questions regarding incontinence for flatus and liquid stools, frequency, clustering and urgency for defecation are taken into account. The score ranges from 0 to 42 is divides into no LARS (0 to 20 points), minor LARS (21 to 29 points), and major LARS (30 to 42 points)

Proportion of curative surgery in case of recurrence (R0)

Proportion of patients with and description of surgical morbidity (Dindo) at 3 months in case of surgery

Study title	NCT ID	Conditions	Interventions	Eligibility	Organization
Dose Escalation Trial of Endoluminal High-Dose-Rate Brachytherapy With Concurrent Chemotherapy for Rectal or Anal Cancer in Patients With Recurrent Disease or Undergoing Non-Operative Management	NCT02199236	Rectal or Anal ...	endorectal brac... concurrent cape... Questionnaires	18 Years -	Memorial Sloan Kettering Cancer Center
Dose Escalation Trial of Endoluminal High-Dose-Rate Brachytherapy With Concurrent Chemotherapy for Rectal or Anal Cancer in Patients With Recurrent Disease or Undergoing Non-Operative Management	NCT02199236	Rectal or Anal ...	endorectal brac... concurrent cape... Questionnaires	18 Years -	Memorial Sloan Kettering Cancer Center
Endorectal Brachytherapy for Rectal Cancer	NCT05591534	Locally Advance...	Endorectal brac...	18 Years -	University Hospital, Bordeaux

Spots Global Cancer Trial Database for endorectal brachytherapy