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. 2018 Feb 1;8:2117. doi: 10.1038/s41598-018-20331-2

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Violin plots representing the glycopeptide ratios (aggressive vs. indolent prostate cancer) of the three most frequent glycopeptide variants identified in the current study. Glycopeptides identified and quantified in 24 serum samples were segmented based on the glycan structures irrespective of the protein origin. The three most frequent glycopeptide variants were the mono-sialylated bi-antennary, di-sialylated bi-antennary without and with one fucose residue. Mascot Distiller was used to calculate the XIC values and the corresponding ratios between aggressive (12) and indolent (12) samples. Glycopeptide precursors contributing to a minimum 50% of the XIC peak area and passing the correlation threshold of 0.8 were only considered.