Drug Profile

XL 557

Alternative Names: XL-557

Latest Information Update: 28 Jan 2026

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At a glance

Originator Basecamp Bio
Developer Exelixis
Class Antineoplastics; Small molecules
Mechanism of Action Somatostatin receptor 2 agonists

Orphan Drug Status

Orphan designation is assigned by a regulatory body to encourage companies to develop drugs for rare diseases.

No
New Molecular Entity Yes

Highest Development Phases

Preclinical Neuroendocrine tumours

Most Recent Events

28 Jan 2026 Exelixis plans an IND application of XL 557 in Neuroendocrine tumors
11 Jan 2026 Preclinical trials in Neuroendocrine tumours in USA (PO)

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