UGT1A1 and Decreased total neutrophil count: TEAEs causing study withdrawal were in three patients (10.3%): one (3.4%) experienced rapid‐onset anaphylaxis14, 15; one died (3.4%) of pulmonary mucormycosis; and one experienced grade 4 diarrhea and neutropenia with a UGT1A1*6 (A/A) homozygosity mutation concerning severe irinotecan‐related neutropenia.16