---
title: Study of ctDNA Guided Change in Tx for Refractory Minimal Residual Disease in Colon Adenocarcinomas
nct_id: NCT04920032
overall_status: RECRUITING
phase: PHASE1
sponsor: University of California, Irvine
study_type: INTERVENTIONAL
primary_condition: Colon Adenocarcinoma
countries: United States
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT04920032.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT04920032"
ct_last_update_post_date: 2026-05-11
last_seen_at: "2026-05-12T06:37:13.185Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Study of ctDNA Guided Change in Tx for Refractory Minimal Residual Disease in Colon Adenocarcinomas

**Official Title:** Proof of Concept Study of ctDNA Guided Change in Treatment for Refractory Minimal Residual Disease in Colon Adenocarcinomas

**NCT ID:** [NCT04920032](https://clinicaltrials.gov/study/NCT04920032)

## Key Facts

- **Status:** RECRUITING
- **Phase:** PHASE1
- **Study Type:** INTERVENTIONAL
- **Target Enrollment:** 22
- **Lead Sponsor:** University of California, Irvine
- **Collaborators:** Taiho Pharmaceutical Co., Ltd., Natera, Inc.
- **Conditions:** Colon Adenocarcinoma, Colorectal Cancer
- **Start Date:** 2021-08-26
- **Completion Date:** 2028-01-21
- **CT.gov Last Update:** 2026-05-11

## Brief Summary

This is a phase 1b, prospective, single arm, non-randomized, open-label clinical trial determining the efficacy of adjuvant trifluridine and tipiracil (TAS-102) in combination with irinotecan in patients with ctDNA positive colon adenocarcinoma.

## Detailed Description

Treatment on study will be administered in 14 day cycles.

## Eligibility

- **Minimum age:** 18 Years
- **Sex:** ALL
- **Healthy Volunteers:** No

```
Inclusion Criteria:

1. Patients must have histologically or cytologically confirmed adenocarcinoma of the colon (high rectal cancer is eligible if resected and no radiation needed). Other histologies which are treated per NCCN guidelines for adjuvant colon cancer are eligible.
2. Must have Stage II, Stage III, or Stage IV colorectal cancer after curative intent resection eligible for adjuvant doublet chemotherapy for at least 3 months.
3. Must have ctDNA positive assay (tested by Signatera MRD assay) after at least 3 months of perioperative chemotherapy
4. Age ≥ 18 years
5. Performance status: ECOG performance status ≤2
6. Life expectancy of greater than 3 months
7. Adequate organ and marrow function as defined below:

   1. leukocytesL ≥ 3,000/mcL
   2. absolute neutrophil count: ≥ 1,500/mcL
   3. platelets: ≥ 80,000/mcl
   4. total bilirubin: within normal institutional limits
   5. AST(SGOT)/ALT(SPGT): ≤ 3 X institutional upper limit of normal or ≤ 5 X if liver metastases are present
   6. creatinine: \<1.5 X ULN
8. The effects of TAS-102 on the developing human fetus at the recommended therapeutic dose are unknown. For this reason and because topoisomerase inhibitors are known to be teratogenic, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of study participation, and for 90 days following completion of therapy. Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately.

   a. A female of child-bearing potential is any woman (regardless of sexual orientation, having undergone a tubal ligation, or remaining celibate by choice) who meets the following criteria:
   * Has not undergone a hysterectomy or bilateral oophorectomy; or
   * Has not been naturally postmenopausal for at least 12 consecutive months (i.e., has had menses at any time in the preceding 12 consecutive months).
9. Ability to swallow tablets
10. Ability to understand and the willingness to sign a written informed consent.

Exclusion Criteria:

1. Patients who have had major surgery within 4 weeks, or chemotherapy or radiotherapy within 2 weeks prior to Cycle 1 Day 1
2. All toxicities attributed to prior anti-cancer therapy other than alopecia must have resolved to grade 1 or baseline
3. Patients may not be receiving any other investigational agents.
4. Patients with known metastases.
5. History of allergic reactions attributed to compounds of similar chemical or biologic composition to TAS-102, irinotecan or other agents used in study.
6. Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements.
7. Prior treatment with TAS-102 at any time or irinotecan within 90 days from enrollment.
8. History of another primary cancer within the last 3 years with the exception of non-melanoma skin cancer, early-stage prostate cancer, or curatively treated cervical carcinoma in-situ.
9. Inability to comply with study and follow-up procedures as judged by the Investigator
10. Patients who are pregnant or nursing due to the potential for congenital abnormalities and the potential of this regimen to harm nursing infants. -
```

## Arms

- **TASIRI** (EXPERIMENTAL) — Patients randomized to the experimental arm ("TASIRI") will be treated with TAS-102 25mg/m2 p.o. on days 1-5 and irinotecan 180mg/m2 i.v. on day 1 every 14 days. If ANC \<1500/uL on day 1 of a cycle, then G-CSF will be added on day 6 for three days.

## Interventions

- **TAS-102** (DRUG) — Given PO
- **Irinotecan** (DRUG) — Given IV
- **Standard Treatment** (COMBINATION_PRODUCT) — 6 cycles for a 2-week regimen (infusional 5FU based) and up to 4 cycles for a 3-week regimen (oral capecitabine based) after randomization
- **Signatera MRD ctDNA Assay** (DIAGNOSTIC_TEST) — To be performed within 6-8 weeks of Cycle 1 Day 1. A Mid-treatment ctDNA is to be completed within 6 - 8 weeks of starting treatment. ctDNA is to also be completed within four weeks after completion of study treatment (+/- two weeks)

## Primary Outcomes

- **Percentage of ctDNA positivity in treatment cohort after 6 cycles or at least 3 months of adjuvant treatment** _(time frame: 6 months)_ — Percent of patients positive for ctDNA after 6 cycles or at least 3 months months after starting adjuvant treatment will be used to estimate the efficacy of adjuvant trifluridine and tipiracil (TAS102) in combination with irinotecan in patients with ctDNA positive colon adenocarcinoma. The Signatera MRD ctDNA Assay will be used to measure ctDNA positivity.

## Secondary Outcomes

- **Percentage of Grade 3-5 Adverse Events** _(time frame: 8 weeks)_

## Locations (1)

- Chao Family Comprehensive Cancer Center, University of California, Irvine, Orange, California, United States — _RECRUITING_

## Recent Field Changes (last 30 days)

- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.phases` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `outcomes.secondary` — added _(2026-05-12)_
- `armsInterventions.arms` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `sponsor.collaborators` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.chao family comprehensive cancer center, university of california, irvine|orange|california|united states` — added _(2026-05-12)_

---

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