Help me understand

My ex husband and father to my children was recently diagnosed with neuroendocrine cancer(stage 3). He was having excruciating pain in his shoulder and back. He went to the ER and a scan showed a mass on his lung that had wrapped around his spine and was compressing his spinal cord. He was also losing feeling in his arms and legs. He had surgery that evening to remove the tumor and relieve the pressure on his spine. One week later he began chemo(platnium based?) and radiation. He will have chemo and radiation on alternating days for seven weeks. He also has Horner's Syndrome from the interference with the sympathetic nervous system. Can someone help me understand this type of cancer and the prognosis better? Thanks. Julie