Two patients treated at MD Anderson Cancer Center for brain tumors were given Botox injections for their tumor-related headaches. The report at the recent meeting of the American Headache Society describes two patients, one with a meningioma (“extensive meningiomatosis”) and the second one with metastatic breast cancer. The first patient completed 14 treatments with Botox over 4 years and the second, 9 treatments over 2 years. Both patients had sustained improvement in their headache intensity, duration, headache-free days, and quality of life. The recurrence of headaches often began 90 days after each treatment, which is the usual duration of the effect of Botox.
Botox is approved by the FDA for the preventive treatment of chronic migraine headaches, which are defined as headaches occurring on at least 15 days each month. However, most headache specialists I know use it for other types of headaches as well. Cluster headaches, hemicrania continua, post-traumatic headaches, numular headaches, trigeminal neuralgia have all been reported in the medical literature to respond to Botox. I’ve also successfully treated patients with these types of headaches, as well as a large number with episodic migraines (less than 15 headache days a month) and a few with chronic tension-type headaches.
Neuropathic pain also seems to respond to Botox and I’ve treated patients with post-herpetic neuralgia (shingles), stump pain after amputation, post-surgical scar pain, and other pain types.
It is not surprising that Botox could help headaches caused by a brain tumor. The brain itself is not pain-sensitive – neurosurgeons can cut it in an awake patient without causing any pain. Most of the pain originates in the brain covering called meninges which are innervated by the trigeminal nerve and which can be stretched and irritated by a tumor. The trigeminal nerve also provides sensation over the face and the anterior part of the head. Botox works by reducing pain signals sent from the trigeminal nerve endings to the brain.
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