NGS analysis of ctDNA revealed a rare ALK oncogenic fusion involving DCTN1 exon 26 and ALK exon 20 (level, plasma 0.23%), and no detectable T790M mutation….The patient was therefore treated with alectinib, and her symptoms significantly improved after 1 month with almost no noticeable side effects....The patient was evaluated with a PR, nearly complete response (CR), as revealed by chest CT, chest x-ray, and brain MRI 6 months later (Figure 1a, 2021 January).