Peptides that home, distribute to, target, are directed to, or accumulate in tumors, cancers, or diseased cells are disclosed. Peptides that cross the blood brain barrier and home, distribute to, target, are directed to, or accumulate in the brain and in a specific region of the brain are also disclosed. Pharmaceutical compositions and uses for peptides or peptide-active agent complexes comprisingsuch peptides are additionally disclosed. Such compositions can be formulated for targeted or untargeted delivery of a drug to a target region, tissue, structure or cell. Targeted compositions of thedisclosure can deliver peptide or peptide- active agent complexes to target regions, tissues, structures or cells targeted by the peptide.
