This study is a retrospective, multicenter clinical study. The main goal is to identify the risk factors for cavity formation in central-type lung cancer lesions, and to construct a prediction model for cavity formation in central-type lung cancer lesions based on the above risk factors.

Inclusion Criteria:

1. Age：older than 18 years；
2. Clinical or pathologically confirmed central lung cancer;
3. Lesions without cavities at first diagnosis of central lung cancer;
4. Performed complete laboratory and imaging research at the first diagnosis of the central lung cancer;
5. Patients with cavities formation during follow up, and the cavities were independently confirmed by at least 3 imaging experts;
6. Patients with complete medical records;

Exclusion Criteria:

1. Patients suffering other malignant tumors;
2. Patients missing the imaging data;
3. Patients missing the clinical data.

This is a multicenter study. Patients from Lishui Central Hospital of Zhejiang Province, the Second Affiliated Hospital of Medical College of Zhejiang University, and Affiliated Hospital of Xinjiang Medical University who meet the above criteria will be included in this study

Statistical analysis plan, informed consent form, and clinical study report can be shared with other researchers.

Within six months after the trial is completed.

Shared data is not available for downloading, but can only be browsed. To download the data, you must contact the researchers. Shared data does not provide any private information of the participants.