UGT1A1 and anemia (phenotype): All <i>UGT1A1 *28/*28</i> patients experienced grade ≥ 2 AEs (100% vs. 69.3%; <i>p</i> = 0.109), with a statistically significant association in the case of febrile neutropenia (33.3% vs. 6.7%; <i>p</i> = 0.025), and a trend towards higher rates of anemia and diarrhea (50.0% vs. 17.3%; <i>p</i> = 0.053).