BackgroundPrevious studies have documented the therapeutic value of computed tomography (CT)âguided percutaneous microwave ablation (MWA) for earlyâstage nonâsmall cell lung cancer (NSCLC). However, few studies have focused on patients aged 80âyears and older. This retrospective study aimed to evaluate the safety and clinical outcomes of CTâguided percutaneous MWA in patients aged 80âyears and older with earlyâstage peripheral NSCLC.MethodsA retrospective analysis of 63 patients aged 80âyears and older with cT1aâ2bN0M0 peripheral NSCLC who underwent CTâguided percutaneous MWA was performed between January 2008 and January 2018 at 11 hospitals in Shandong Province, China.ResultsThe median followâup time was 21.0 months. The overall median survival time was 50âmonths. The cancerâspecific median survival time was not reached in five years. The oneâ, twoâ, threeâ, fourâ, and fiveâyear overall survival rates were 97.1%, 92.6%, 63.4%, 54.4%, and 32.6%, respectively. The oneâ, twoâ, and threeâyear cancerâspecific survival (CSS) rates were 97.9%, 97.9%, and 69.4%, respectively. The fourâ and fiveâyear CSS rates were not achieved. A total of 14 patients (22.2%) had local progression. The oneâ, twoâ, threeâ, fourâ, and fiveâyear local control rates were 88.8%, 78.8%, 70.3%, 63.9%, and 63.9%, respectively. The mortality rate was 0% within 30âdays after the procedure. Major complications included pneumothorax requiring drainage (21.1%), pulmonary infection (4.2%), and pleural effusions requiring drainage (2.8%).ConclusionsCTâguided percutaneous MWA is a safe and effective modality for treating patients aged 80âyears and older with earlyâstage peripheral NSCLC.