Erratum to: J Cancer Res Clin Oncol (2012) 138:1717–1725 DOI 10.1007/s00432-012-1219-x

In the original publication, the order in the author group was incorrect. The correct order of authors is given below.

Ying ** · Yan-**a Shi · **u-Yu Cai · **-Ya **a · Yu-Chen Cai · Ye Cao · Wei-Dong Zhang · Wei-Han Hu · Wen-Qi Jiang

Also, the name of one of the co-authors was missed in the contribution line. The amended statement is given below.

**u-Yu Cai, Yan-**a Shi, Ying ** contributed equally to this work.