Circulating tumor DNA guided adjuvant chemotherapy in stage II colon cancer (MEDOCC-CrEATE): study protocol for a trial within a cohort study

BMC Cancer. 2020 Aug 20;20(1):790. doi: 10.1186/s12885-020-07252-y.

Abstract

Background: Accurate detection of patients with minimal residual disease (MRD) after surgery for stage II colon cancer (CC) remains an urgent unmet clinical need to improve selection of patients who might benefit form adjuvant chemotherapy (ACT). Presence of circulating tumor DNA (ctDNA) is indicative for MRD and has high predictive value for recurrent disease. The MEDOCC-CrEATE trial investigates how many stage II CC patients with detectable ctDNA after surgery will accept ACT and whether ACT reduces the risk of recurrence in these patients.

Methods/design: MEDOCC-CrEATE follows the 'trial within cohorts' (TwiCs) design. Patients with colorectal cancer (CRC) are included in the Prospective Dutch ColoRectal Cancer cohort (PLCRC) and give informed consent for collection of clinical data, tissue and blood samples, and consent for future randomization. MEDOCC-CrEATE is a subcohort within PLCRC consisting of 1320 stage II CC patients without indication for ACT according to current guidelines, who are randomized 1:1 into an experimental and a control arm. In the experimental arm, post-surgery blood samples and tissue are analyzed for tissue-informed detection of plasma ctDNA, using the PGDx elio™ platform. Patients with detectable ctDNA will be offered ACT consisting of 8 cycles of capecitabine plus oxaliplatin while patients without detectable ctDNA and patients in the control group will standard follow-up according to guideline. The primary endpoint is the proportion of patients receiving ACT when ctDNA is detectable after resection. The main secondary outcome is 2-year recurrence rate (RR), but also includes 5-year RR, disease free survival, overall survival, time to recurrence, quality of life and cost-effectiveness. Data will be analyzed by intention to treat.

Discussion: The MEDOCC-CrEATE trial will provide insight into the willingness of stage II CC patients to be treated with ACT guided by ctDNA biomarker testing and whether ACT will prevent recurrences in a high-risk population. Use of the TwiCs design provides the opportunity to randomize patients before ctDNA measurement, avoiding ethical dilemmas of ctDNA status disclosure in the control group.

Trial registration: Netherlands Trial Register: NL6281/NTR6455 . Registered 18 May 2017, https://www.trialregister.nl/trial/6281.

Keywords: Adjuvant chemotherapy; Circulating tumor DNA; Colon cancer; TwiCs; ctDNA.

Publication types

  • Clinical Trial Protocol

MeSH terms

  • Adult
  • Antineoplastic Combined Chemotherapy Protocols / administration & dosage*
  • Antineoplastic Combined Chemotherapy Protocols / adverse effects
  • Antineoplastic Combined Chemotherapy Protocols / standards
  • Biomarkers, Tumor / blood*
  • Capecitabine / administration & dosage
  • Capecitabine / adverse effects
  • Chemotherapy, Adjuvant / economics
  • Chemotherapy, Adjuvant / psychology
  • Chemotherapy, Adjuvant / standards
  • Chemotherapy, Adjuvant / statistics & numerical data
  • Circulating Tumor DNA / blood*
  • Colectomy
  • Colonic Neoplasms / blood
  • Colonic Neoplasms / diagnosis
  • Colonic Neoplasms / mortality
  • Colonic Neoplasms / therapy*
  • Cost-Benefit Analysis
  • Disease-Free Survival
  • Female
  • Follow-Up Studies
  • Humans
  • Liquid Biopsy
  • Male
  • Neoplasm Recurrence, Local / epidemiology*
  • Neoplasm Recurrence, Local / prevention & control
  • Neoplasm Staging
  • Neoplasm, Residual
  • Netherlands / epidemiology
  • Oxaliplatin / administration & dosage
  • Oxaliplatin / adverse effects
  • Patient Acceptance of Health Care / psychology
  • Patient Acceptance of Health Care / statistics & numerical data
  • Practice Guidelines as Topic
  • Prospective Studies
  • Quality of Life
  • Randomized Controlled Trials as Topic

Substances

  • Biomarkers, Tumor
  • Circulating Tumor DNA
  • Oxaliplatin
  • Capecitabine