PDCD4 and colorectal cancer: The highest number of citations (n = 1669) was achieved by the 2008 article “MicroRNA-21 (miR-21) post-transcriptionally downregulates tumor suppressor Pdcd4 and stimulates invasion, intravasation and metastasis in colorectal cancer” [36], published in the Oncogene journal, with a 7.22 impact factor (IF) at the time of publication.