The drug has been and is still[when?] being evaluated for diseases other than migraine, where the endogenous substance CGRP has been implicated in the pathology.[citation needed] Teva is still[when?] developing it for episodic cluster headache but stopped development of fremanezumab for the treatment of chronic cluster headache in 2018 after the primary endpoint of a Phase III trial was not met.[13][needs update]