Tetrandrine slows the radiographic progression of progressive massive fibrosis in pneumoconiosis: a retrospective cohort study

Objective This study aims to explore the clinical effect of Tetrandrine (Tet) on progressive massive fibrosis (PMF) of pneumoconiosis. Methods This retrospective study collected 344 pneumoconiosis patients with PMF, and 127 were eligible for the final analysis, including 57 patients in the Tet group and 70 patients in the control group. The progress of imaging and lung function were compared between the two groups. Results After 13 months (median) of treatment, the size of PMF was smaller in the Tet group than that in the control group (1526 vs. 2306, p =0.001), and the size was stable in the Tet group (1568 vs. 1526, p = 0.381), while progressed significantly in the control group (2055 vs. 2306, p =0.000). The small nodule profusion and emphysema were also milder than that in the control group (6.0 vs. 7.5, p =0.046 and 8.0 vs. 12, p =0.016 respectively). Pulmonary ventilation function parameters FVC and FEV 1 improved in the Tet group (3222 vs. 3301, p =0.021; 2202 vs. 2259, p =0.025 respectively) and decreased in the control group (3272 vs. 3185, p = 0.00; 2094 vs. 1981, p =0.00 respectively). FEV 1 /FVC was also significantly higher in the Tet group than that in the control group (68.45vs. 60.74, p =0.001). However, similar result was failed to observed for DLco%, which showed a significant decrease in both groups. Conclusion Tet has shown great potential in the treatment of PMF by slowing the progression of pulmonary fibrosis and the decline of lung function.