Re-challenge Therapy With Chemotherapy & Panitumumab in Metastatic Colorectal Cancer Patients Treated With an Anti-EGFR

Phase 2

• Conditions: Metastatic Colorectal Cancer
• Interventions: Drug: Panitumumab

• Registration Number: NCT03940131
• Lead Sponsor: King Abdullah Medical City

Brief Summary

patients with metastatic colorectal cancer who were initially RAS wild and failed at least 2 lines of chemotherapy will be enrolled. Anti-EGFR must have been given in 1st line. Those who remain RAS-wild upon retesting will receive rechallenge with panitumumab and chemotherapy

Detailed Description

This is a single arm pilot multicenter prospective study. We will recruit KRAS/RAS wild metastatic colorectal cancer patients who received at least 2 lines of chemotherapy and the 1st line must include cetuximab/panitumumab combined with chemotherapy. We will repeat RAS testing after progression on the last line of therapy. RAS testing will be taken via liquid biopsy using ctDNA or tissue biopsy from either a new tumour lesion or a previously present lesion which shows evidence of disease progression by radiological imaging. Only RAS-wild patients upon re-testing will be enrolled and will receive re-challenge therapy with panitumumab combined with chemotherapy similar to that given at 1st line (5-fluorouracil/leucoverin combined with oxaliplatin or irinotecan). Those converted to RAS mutant will not be enrolled.

All patients will be treated until disease progression, unacceptable toxic effects or withdrawal of consent.

Study Timeline

• Study First Submitted: 2019-05-05
• Study First Submitted QC: 2019-05-06
• Study First Posted: 2019-05-07
• Study Start: 2020-06-10
• Status Verified: 2022-04
• Last Update Submitted: 2022-04-05
• Last Update Posted: 2022-04-06
• Primary Completion: 2022-07
• Study Completion: 2022-07

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 30

Inclusion Criteria

• Histologically confirmed metastatic adenocarcinoma of the colon or rectum with initially KRAS/RAS wild tumours.
• Patients received at least 2 lines of chemotherapy including a fluoropyrimidine, irinotecan and oxaliplatin± bevacizumab.
• First line chemotherapy regimen with a fluoropyrimidine and irinotecan or fluoropyrimidine and oxaliplatin in addition to an anti-EGFR agent (cetuximab/panitumumab).
• No evidence of disease progression for at least 4 months from the start of 1st line therapy.
• At least one measurable lesion ≥ 10 mm as assessed by CT-scan or MRI must be available and accessible for re-biopsy and RAS testing.
• Repeated RAS testing before re-challenge therapy must be done.
• Age ≥18 years.
• ECOG Performance status (PS) 0-2.
• The patient has adequate organ function, defined as : Absolute neutrophil count (ANC) ≥ 1.5 x 109/L, hemoglobin ≥ 9 g/dl, and platelets ≥ 100 x 109/L. Total bilirubin ≤ 1.5 times upper limit of normal value (ULN), serum alkaline phosphatase level < 5 times ULN, Serum creatinine level <1.5 mg/dl.
• For female patients of childbearing potential, negative pregnancy test within 7 days before starting the study treatment.
• Subject must provide informed consent prior to initiation of any study specific activities/procedures

Exclusion Criteria

• Significant cardiovascular disease including unstable angina or myocardial infarction within 12 months before initiation of study treatment or a history of ventricular arrhythmia (treated or not).
• History or evidence of central nervous system metastasis (CT-scan or MRI are not mandatory if no clinical symptoms).
• Known allergy or hypersensitivity to panitumumab.
• Patients with right-sided colon cancer originating from the ascending colon or hepatic flexure.
• Patients with known MSI-high status.
• Patients with known HER2-positive status.
• Previous or concurrent malignancy except for basal or squamous cell skin cancer, in situ carcinoma of the cervix, low-risk prostate cancer according to d'Amico classification or other solid tumors treated curatively and without evidence of recurrence for at least 5 years prior to the study.
• Active or uncontrolled clinically serious infection.
• Known human immunodeficiency virus (HIV) infection or acquired immunodeficiency syndrome (AIDS)-related illness.
• Other serious and uncontrolled non-malignant disease.
• Pregnancy.
• Breast feeding.
• Treatment with any other investigational medicinal product within 28 days prior to study entry.
• Concomitant administration of live, attenuated virus vaccine such as yellow fever vaccine.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Single Arm	Panitumumab	Panitumumab with FOLFOX6/FOLFIRI

Primary Outcome Measures

Name	Time	Method
Overall response rate (ORR)	3 years	defined as the proportion of patients with tumour response (complete response or partial response) by RECIST criteria 1.1.

Secondary Outcome Measures

Name	Time	Method
Progression-free survival (PFS)	3 years	defined as the time from the date of starting the study treatment regimen till the date of the first disease progression after re-challenge therapy or death (any cause).
Disease control rate (DCR)	3 years	defined as the proportion of patients with tumour response (complete response or partial response) or tumour stabilization during study treatment.
Overall survival (OS)	3 years	defined as the time from the date of starting the study treatment regimen to the date of patient death, due to any cause, or to the last date at which the patient was known to be alive.

Trial Locations

Locations (1)

King Abdullah Medical City, Holy Capital; 🇸🇦 Mecca, Makkah Western, Saudi Arabia