Noninvasive real-time monitoring of cfDNA genotyping and disease changes in patients with NKTCL. Patient identification (ID) numbers 2 (A), 5 (B), 10 (C), 12 (D), 15 (E), 17 (F), 24 (G), 20 (H), 3 (I), 6 (J), 4 (K), 1 (L), and 11 (M). PR, partial remission.