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"Furthermore, both SMAD2 and SMAD3 are activated by phosphorylation, and our results support that patients whose TAFs exhibit a low (<1) pSMAD3/pSMAD2 ratio may be refractory to nintedanib and possibly to other antifibrotic drugs, whereas those with high (>1) pSMAD3/pSMAD2 ratio may elicit positive responses (where pSMAD2 and pSMAD3 refers to phosphorylated SMAD2 and SMAD3, respectively) (Figure 3D)."