Individuals with MRP1A−/GSTP1Val− had significantly higher urinary arsenic levels.
Individuals with the MRP1A−/GSTP1Val− had lower blood arsenic levels.
Individuals with MRP1A−/GSTP1Val− might be advantageous for being protected from arsenic toxicity.
Genetic variants in MRP1 G1666A seemed to affect individual susceptibility to arsenic toxicity.