Monitoring of somatic mutations in circulating cell-free DNA by digital PCR and next-generation sequencing during afatinib treatment in patients with lung adenocarcinoma positive for EGFR activating mutations. - Iwama, E.; Sakai, K.; Azuma, K.; Harada, T.; Harada, D.; Nosaki, K.; Hotta, K.; Ohyanagi, F.; Kurata, T.; Fukuhara, T.; Akamatsu, H.; Goto, K.; et al. (Annals of Oncology, 2017)