What latex-related warning applies to the needle cap of the Xolair (omalizumab) 150 mg pre-filled syringe?

The Xolair (omalizumab) 150 mg pre-filled syringe’s removable needle cap contains a natural rubber latex derivative, although no natural rubber latex has been detected; use in latex-sensitive individuals has not been studied, so a potential risk of hypersensitivity reactions cannot be ruled out.