TCF3 and acute lymphoblastic leukemia: These included multiple IKZF1‐ (ALL‐17, ALL‐19, ALL‐88, ALL‐93) or PAX5‐ (ALL‐11, ALL‐88) altered PDXs, one TCF3::HLF fusion (ALL‐7), and one NUP214::ABL1 fusion (ALL‐19).