If you are found to be eligible to take part in this study, you will be given the L9-NC aerosol (an inhaled spray) by mouth through a face mask for Cycle 1 of therapy. You will receive L9-NC over about 30 minutes once a day, for 5 days in a row. This will be done for 2 weeks. Doctors will then monitor you for safety for another 2 weeks after treatment. A treatment cycle lasts for 4 weeks.