Meaningful nomograms based on systemic immune inflammation index predicted survival in metastatic pancreatic cancer patients receiving chemotherapy oleh Yanan Sun, Jiahe Hu, Rongfang Wang, Xinlian Du, Xiaoling Zhang, Jiaoting E, Shaoyue Zheng, Yuxin Zhou, Ruishu Mou, Xuedong Li, Hanbo Zhang, Ying Xu, Yuan Liao, Wenjie Jiang, Lijia Liu, Ruitao Wang, Jiuxin Zhu, Rui Xie