Of note, one additional patient (not on study) who had pure bone metastasis and received DeltaRex-G + DeltaVax (a tumor-targeted retrovector encoding a granulocyte macrophage colony stimulating factor (GM-CSF) gene) for 6 months was reported alive 12 years after DeltaRex-G treatment initiation. Here, CSF2 is linked to bone metastasis.