preferred_name: No information whatsoever can be inferred from this exceptional value (e.g, unknown if immunotherapy administered).
preferred_name_lc: no information whatsoever can be inferred from this exceptional value (e.g, unknown if immunotherapy administered).
label: No information whatsoever can be inferred from this exceptional value (e.g, unknown if immunotherapy administered).
label_lc: no information whatsoever can be inferred from this exceptional value (e.g, unknown if immunotherapy administered).