Treatment Regimens
| Treatment regimen | RI-SUV ≥ 0% (n = 27) | RI-SUV < 0% (n = 23) | P |
| None | 7 | 17 | 0.0007 |
| Treatment | 20 | 6 | |
| Prednisolone only | 7 | 2 | |
| Prednisolone + cyclosporine A | 1 | 0 | |
| Prednisolone + cyclophosphamide | 0 | 2 | |
| Prednisolone + pirfenidone | 1 | 0 | |
| Prednisolone + cyclosporine A + pirfenidone | 4 | 0 | |
| Pirfenidone only | 7 | 2 | |
| Median time to treatment initiation (d) | 22.5 (range, 1–1,161) | 351.5 (range, 62–1,668) | 0.088 |