packaging cell line that produces retroviral gene therapy vectors for the treatment of cancer, AIDS, metabolic diseases, neurogenerative diseases, cardiovascular diseases, hemoglobinopathies and hormone deficiencies; packaging cell lines for use in the treatment of cancer, AIDS, metabolic diseases, neurodegenerative diseases, cardiovascular diseases, hemoglobinopathies and hormone deficiencies; pharmaceutical preparations for use in the treatment of cancer, AIDS, metabolic diseases, neurodegenerative diseases, cardiovascular diseases and hormone deficiencies