When there is a distant spread of cancer, or metastasis, lung melanoma is incurable, according to News Medical. The five-year survival rate is less than 10 percent, with the median survival being six to 12 months, as of 2011.
People can live many months with melanomas, with a better prognosis for skin and lung melanoma, notes News Medical. Melanomas that are less invasive, even if they have progressed to the lymph nodes, are easier to treat than deeper melanomas that have no metastasis. The type of treatment that is given for later stages of the disease is hospice, which is also known as palliative care.