HM13 and diffuse large B-cell lymphoma: Abbreviations: DLBCL, diffuse large B-cell lymphoma; NaPi2b, sodium-dependent phosphate transport protein 2B; SPDB, disulfide N-succinimidyl 4-(2pyridyldithio)butyrate; SPP, N-succinimidyl 4-(2-pyridyldithio)pentanoate.