Choi, a woman in her 50s who lives in Seongbuk-gu, Seoul, was diagnosed with stage 4 lung cancer last year and was disappointed. At the time of diagnosis, metastases had occurred in various organs, including the brain, eyeballs, and bones, so it was impossible to participate in clinical research as well as surgery. Fortunately, EGFR targeted anti-cancer drugs were available. The condition began to miraculously improve when the primary treatment began with "Tagrisso," which has the highest penetration rate of brain war among EGFR targeted anti-cancer drugs on the market. The size of the cancer has also decreased noticeably. However, she has been unable to quit her job for seven months due to her continued high-priced a