The present application relates to methods and uses of conjugates comprising antitumor agents (e.g., chemotherapeutic agents) conjugated to
peptide compounds targeting Sortilin-expressing
cancer stem cells (CSCs), in embodiments for the treatment of
poor prognosis cancers
refractory to standard antitumor therapies associated the presence of Sortilin-expressing CSCs, and for preventing or treating
cancer relapse or recurrence.