A Study to Assess Efficacy of RXC004 +/- Nivolumab in Ring Finger Protein 43 (RNF43) or R-spondin (RSPO) Aberrated, Metastatic, Microsatellite Stable, Colorectal Cancer After Progression on Standard of Care (SOC)

The study is composed of two arms, RXC004 monotherapy (Arm A) and RXC004 in combination with nivolumab (Arm B). 20 evaluable patients will be enrolled in Arm A and 20 eligible patients in Arm B. The study initially opened with Arm A; Arm B will be opened once a recommended Phase II dose (RP2D) for RXC004 in combination with nivolumab is established in the phase I dose escalation study (NCT03447470). Once Arm B is opened, patients who are eligible for both Arm A and Arm B will be randomised 2:1 to Arm B: Arm A in an open-label manner. Patients in Arm A may be treated with RXC004 + nivolumab if they have progressive disease on the 8 week scan, as long as they are eligible for Arm B and have Sponsor approval.

Age

18–any

Sex

ALL

Healthy volunteers

Not accepted

You may be eligible if

Histological documentation of metastatic (Stage IV) Colorectal cancer (CRC) and
1. Documented tumour tissue aberration in RNF43 and/or RSPO
2. Documented confirmation of microsatellite stable (MSS) status
Patients must have had documented radiological progression following a minimum of 1 prior SOC treatment regimen for metastatic disease
Eastern Cooperative Oncology Group performance status 0 or 1
At least one lesion that is measurable by RECIST 1.1 at baseline
Patients must have at least one lesion suitable for biopsy at screening and be willing to provide mandatory tumour biopsy samples
Patients with adequate organ functions
Female patients of childbearing potential must have a negative pregnancy test prior to start of dosing
Female patients of childbearing potential and male patients with female partners of childbearing potential must agree to use a highly effective method of contraception during the study and for at least 5 months after the last dose of study drug.
Patients must have had documented RECIST1.1 defined radiological progression on RXC004 monotherapy treatment on the first scheduled scan (week 8 +/- 1 week)
Patients must receive Cycle 1 Day 1 of combination study treatment within 28 days of the first scheduled scan (week 8 +/- 1 week).

You may not be if

Prior therapy with a compound of the same mechanism of action as RXC004
Patients at higher risk of bone fractures
Any known uncontrolled inter-current illness or persistent clinically significant toxicity related to prior anti-cancer treatment
Patients who have any history of an active (requiring treatment) other malignancy within 2 years of study entry
Patients with known or suspected brain metastases
Use of anti-neoplastic agents, immunosuppressants and other investigational drugs
Patients with a known hypersensitivity to any RXC004 excipients
Patients with a contra-indication for denosumab treatment
Patients who are pregnant or breast-feeding
Use of any live or live-attenuated vaccines against infectious diseases (e.g., influenza nasal spray, varicella) within 4 weeks (28 days) of initiation of study treatment
Patients with a mean resting corrected QTcF \>470 ms, obtained from triplicate electrocardiograms performed at screening
For patients on RXC004 + nivolumab combination treatment (Arm B or Arm A RXC004 + nivolumab treatment phase):
Patients with any contraindication to the use of nivolumab
Patients with active or prior documented autoimmune or inflammatory disorders within the past 5 years
Patients with active infections, including tuberculosis, hepatitis B, hepatitis C or human immunodeficiency virus
Patients with a history of allogeneic organ transplant or active primary immunodeficiency
Patients with a known hypersensitivity to nivolumab or any of the excipients of the product

What this study is about