For reasons that are not well understood despite repeated efforts we were able to recover cells that only stably over-express GFP, but not the GFP-DUSP12 fusion, from a human fibrosarcoma (HT1080), cervical adenocarcinoma (HELA), breast adenocarcinoma (MCF-7) or a mouse fibroblast (NIH3T3) cell line (data not shown). The gene discussed is DUSP12; the disease is fibrosarcoma.