Fig. 1
From: Can IDO activity predict primary resistance to anti-PD-1 treatment in NSCLC?
Correlation of serum kyn/trp ratio and serum quinolic acid concentration with immunotherapy response. Patients who showed an early progression (YES, n = 14) present a significantly higher concentration of kyn/trp ratio (a) and quinolic acid concentration (b) compared to patients who do not have an early progression (NO, n = 12). #p < 0.05 (Mann–Whitney test)