Four structurally similar compounds were found to have IC50 values in an RNA‐competitive FP assay ranging from 2.9 to 15 μM, while none were able to inhibit hnRNP A1 or F. Further selectivity analysis was performed by evaluating the inhibition of the growth of cancer cell lines in comparison to the same cell lines that had hnRNP A18 knocked down. Here, CIRBP is linked to cancer.