The authors would like to draw the reader's attention to errors in the following article:
Yamaguchi SI, Ueki A, Sugihara E, Onishi N, Yaguchi T, Kawakami Y, Horiuchi K, Morioka H, Matsumoto M, Nakamura M, Muto A, Toyama Y, Saya H, Shimizu T. Synergistic antiproliferative effect of imatinib and adriamycin in platelet-derived growth factor receptor-expressing osteosarcoma cells. Cancer Sci 2015; 106: 875–882.
The captions showing the treatment of imatinib (2 μM) on Fig. 3(c) and (d) should be “−− + − + − +” from lane 1 to 7.
The authors apologize for this error and any confusion it may have caused.