Correction to: Leukemia https://doi.org/10.1038/s41375-021-01501-0, published online 29 January 2022

We noted a mistake in the Introduction section in the following sentence: “and ability to differentiate therapeutic monoclonal antibodies from endogenous M proteins based on unique retention time and mass”. The use of mass and retention time is actually not true for the MALDI method. We would like to correct this sentence and replace it with: “with ability to aid in differentiating therapeutic monoclonal antibodies from endogenous M proteins on the basis of mass to charge”.