Our study showed that inhibition of USP1 by shRNA or pimozide treatment significantly increased the ubiquitination of MAX/MYC and reduced the protein levels of MAX/MYC in rituximab/chemotherapy resistant DLBCL cells, which led to the decrease of MYC target genes and the growth inhibition of lymphoma cells in the cell or patient-derived DLBCL mouse model. Here, MYC is linked to lymphoma.