Manganese chloride tetrahydrate (CMC-001) enhanced liver MRI: evaluation of efficacy and safety in healthy volunteers.

Object: To evaluate the efficacy of three dose levels of the oral hepatobiliary manganese-based magnetic resonance imaging (MRI) contrast agent CMC-001, and assess its safety profile and patient acceptability.

Materials And Methods: After ethics committee approval, 32 healthy volunteers (males/females: 18/14) were included. Liver MRI was performed before and 3 h after ingestion of 0.8, 0.4, and 0.2 g of CMC-001 on separate occasions. Liver-to-muscle signal intensity (SI) ratio from baseline to post-contrast and image quality was assessed. Adverse drug reactions/adverse events (ADRs/AEs) and clinico-laboratory tests were monitored.

Results: The increase in liver-to-muscle SI ratio was significantly higher after 0.8 g (0.696) compared to 0.4 g (0.458) and 0.2 g (0.223) (in all pair-wise comparisons, P < 0.0001). The overall image quality was superior after 0.8 g. ADRs/AEs were dose-related and predominantly of mild intensity.

Conclusion: Liver MRI using 0.8 g CMC-001 has the highest efficacy and still acceptable ADRs and should therefore be preferred.