In agreement with these findings, we summarized that miR‐149‐5p repression recovered circ‐CSNK1G1 knockdown‐blocked cell proliferation, survival, and invasion, while miR‐149‐5p restoration suppressed these cell malignant behaviors, exposing that miR‐149‐5p played a tumor‐suppressor role in thyroid cancer. This evidence concerns the gene CSNK1G1 and thyroid cancer.