Cancer Immunotherapy Preparation and Immune Cells Activation through Hapten-Enhanced Chemotherapy in Primary Lung Cance Baofa Yu1,2,3,4,5*, Feng Gao1, Peng Jing1, Peicheng Zhang1, Xiaomin Zhang1, Guoqin Zheng1, Shengjun Zhou1, Jian Zhang2, Fu Qiang2, Yan Han2 and Yan Jiang6