Prognostic value of body mass index for first-line chemoimmunotherapy combinations in advanced non-small cell lung cancer in Chinese population

Background: Few studies have examined the correlation between body mass index (BMI) and effectiveness of first -line chemoimmunotherapy in patients with advanced non -small cell lung cancer (NSCLC); moreover, the conclusion remains elusive and no such studies have been conducted in the Chinese population. Our study aimed to validate the predictive significance of BMI in Chinese patients with advanced NSCLC receiving first -line chemoimmunotherapy combinations. Methods: Data of patients with advanced NSCLC treated with first -line chemoimmunotherapy between June 2018 and February 2022 at three centers were retrieved retrospectively. The association between baseline BMI with progression-free survival (PFS) and overall survival (OS) was evaluated using the Kaplan -Meier method and Cox regression models. BMI was categorized according to the World Health Organization criteria. Results: Of the included 805 patients, 5.3 % were underweight, 63.4 % had normal weight, 27.8 % were overweight, and 3.5 % were obese. Survival analysis showed that patients in the high BMI group had significantly better PFS ( p = 0.012) and OS ( p = 0.014) than those in the low BMI group. Further, patients in the overweight subgroup had better PFS ( p = 0.036) and OS ( p = 0.043) compared to the normal weight population. The results of Cox regression analysis confirmed the correlations between BMI and prognosis of advanced NSCLC patients receiving first -line chemoimmunotherapy combinations. Conclusions: Baseline BMI affected the clinical outcomes of first -line chemoimmunotherapy combinations in patients with advanced NSCLC, and was especially favorable for the overweight subgroup.