Further analysis showed that FOLR1 is uniquely expressed in C/G AML (31 out of 39 [80%] of C/G-positive samples expressed FOLR1 greater than 1 transcript per kilobase million [TPM]) and is silent in other AML and in normal bone marrow bulk samples and peripheral blood CD34+ samples (Supplemental Figure 7). Here, FOLR1 is linked to acute myeloid leukemia.