A drug conjugate is provided herein. The conjugate comprises a protein based recognition-molecule (PBRM) and a polymeric carrier comprising poly(1-hydroxymethylethylene hydroxymethyl-formal) (PHF) substituted with one or more -LD-D, the protein based recognition-molecule being connected to the polymeric carrier by Lp. Each occurrence of D is independently a therapeutic agent having a molecular weight ≤ 5 kDa, LD and Lp are linkers connecting the therapeutic agent and PBRM to the polymeric carrier respectively. Also disclosed are polymeric scaffolds comprising PHF useful for conjugating with a PBRM to form a polymer-drug-PBRM conjugate described herein, compositions comprising the conjugates, methods of their preparation, and methods of treating various disorders with the conjugates of their compositions.
