Neither of the GM-CSF-secreting cell lines alone, injected intratumorally, was sufficient to induce complete tumor regression; however, the 3T3/GM-CSF cell line modestly improved survival compared to the PBS (p < 0.05), while the Neuro-2a/GM-CSF did not (Figure 1A,B). The gene discussed is CSF2; the disease is neoplasm.