The cancer germ-line genes MAGE-1, MAGE-3 and PRAME are commonly expressedby human myeloma cells

In this study, we have investigated the mRNA expression of the cancer germ- line genes MAGE, BAGE, GAGE, RAGE and the tumor-overexpressed gene FRAME by human myeloma cell lines and malignant plasma cells from patients with mul tiple myeloma (MM). By reverse transcription-FOR, we show that all myeloma cell lines (n = 16) express at least one of these genes, except RAGE-1 that was never expressed. We show that malignant plasma cells from the majority of MM patients (n = 21) expressed MAGE-1, MAGE-3 and FRAME. On the contrar y, polyclonal reactive plasma cells did not express any of these genes. By flow cytometry, we show that mage-1 protein is expressed within myeloma cel ls and cell lines and that anti-mage-1.HLA-A1 cytotoxic T lymphocytes effic iently killed MAGE-1(+)HLA-A1(+) MDN myeloma cells. Taken together, our dat a show that mage-1 and mage-3 could constitute specific targets for tumor i mmunotherapy of MM patients.