Updates are available Correction dated 2018-03-12

Article History

Received: 8 November 2017

Accepted: 29 January 2018

First Online: 6 February 2018

Change Date: 12 March 2018

Change Type: Correction

Change Details: The original article [1] contained an error in Table 1 whereby the ‘Positive’ column in the ‘PD-L1’ Tumor type group of columns was mistakenly included at the beginning of the ‘PD-L2’ Tumor type group of columns.

Ethics approval and consent to participate

: Tumor samples were acquired from the Musculoskeletal Tumor Center, Peking University People’s Hospital (Beijing, China). Informed consent was obtained from each patient, and the study was approved by the ethics committee of Peking University People’s Hospital.

: Not applicable.

: The authors declare that they have no competing interests.

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