We explored the in vitro efficacy of drug combinations Ribociclib (R) and Alpelisib (A) in four CRC cell lines with different mutational status; CACO2 (PIK3CA/KRAS wild-type), LS1034 (KRAS mutated), SNUC4 (PIK3CA mutated) and DLD1 (PIK3CA/KRAS mutated)....Drug combination analysis showed that the combination of R and A has a synergistic anti-proliferative effect in all CRC cell lines tested.