In order to investigate how the ch14.18/CHO-treatment affects PHLDA1 protein interactors in neuroblastoma cells, we compared potential PHLDA1 binding proteins in the control- and the ch14.18/CHO antibody-treated IMR-32 cells by co-immunoprecipitation, using anti-PHLDA1 antibodies followed by mass spectrometry. The gene discussed is PHLDA1; the disease is neuroblastoma.