Lung adenocarcinoma Ca means lung adenocarcinoma, and Ca is short for Cancer in English. In the clinic, in order to protect the privacy of patients, doctors write cancer as Ca at the request of family members.Lung adenocarcinoma is the main pathological type of non-small cell lung cancer, accounting for about 40% of non-small cell lung cancers, and is mostly found in women. Currently, gene mutations can be detected in lung adenocarcinoma, especially in non-smoking women who are prone to combine with gene mutations such as EGFR or ALK, which can then be treated with targeted drugs.