CELF4 and osteosarcoma: Six variants were found to be associated with doxorubicin-induced cardiotoxicity in a cohort containing osteosarcoma patients and were replicated minimally once in an independent patient cohort, namely CELF4 rs1786814, HAS3 rs2232228, RARG rs2229774, SLC22A17 rs4982753, SLC22A7 rs4149178, SLC28A3 rs7853758.