Tuesday, December 16, 2008

Is Temozolomide a new treatment for aggressive pituitary tumors?

The authors of this study, Low 06-methylguanine-DNA methyltransferase[P1] (MGMT) expression and response to temozolomide in aggressive pituitary tumours, detail the use of temozolomide as a possible treatment for the aformentioned tumors. They also evaluate 06-methylguanine-DNA methyltransferase (MGMT) "expression in pituitary tumours and consider whether MGMT expression is associated with response to temozolomide therapy in aggressive pituitary tumours".

Why is this relevant? Because so many ACTH-secreting adenomas of the pituitary invade other structures. The study states:

Clinically significant pituitary tumours occur in approximately 1 in every 1000
individuals ...between 35-55% of adenomas demonstrate invasion into bone,
dura or adjacent structures such as the cavernous or sphenoid sinuses or
brain...

According to this article, some tumors display aggressive behavior and are resistant to current treatments. They can require the patient to have multiple operations and/or radiation therapy in order to control the growth.

Temozolomide works for some patients in the control of their tumors. Widely used for other brain tumors, its success has been mixed when applied to aggressive pituitary tumors. In this study, the relationship of "MGMT immunohistochemistry in two patients with aggressive pituitary tumours treated with temozolomide" is important. "[L]ow expression was demonstrated in a patient who responded to temozolomide whereas high expression was seen in another patient with no response to this agent 20."

When enlarging their study to 88 tissue samples from previous patients, the authors found their "work suggests that low MGMT protein expression, as assessed by immunohistochemistry, may be associated with a clinical response to temozolomide in aggressive pituitary tumours and supports the brief report of Kovacs et al."

The bottom line: MGMT immunohistochemistry is a promising technique for predicting the applicability of temozolomide for controlling aggressive pituitary tumors.


Ann I. McCormack, Kerrie L. McDonald, Anthony J. Gill, Susan J. Clark, Morton G. Burt, Kirsten A. Campbell, Wilton J. Braund, Nicholas S. Little, Raymond J. Cook, Ashley B. Grossman, Bruce G. Robinson, Roderick J. Clifton-Bligh (2008). Low 0(6)-methylguanine-DNA methyltransferase (MGMT) expression and response to temozolomide in aggressive pituitary tumours
Clinical Endocrinology DOI: 10.1111/j.1365-2265.2008.03487.x

5 comments:

  1. First paper of Temozolomide in Pituitary Adenomas ( agressive ):
    Antitumour effects of temozolomide in a man with a large, invasive prolactin-producing pituitary neoplasm.
    Syro LV, Uribe H, Penagos LC, Ortiz LD, Fadul CE, Horvath E, Kovacs K.
    Clin Endocrinol (Oxf). 2006 Oct;65(4):552-3.

    ReplyDelete
  2. Excellent! Thank you. I found the abstract here (click me) for those who want to read.

    ReplyDelete
  3. Hello,

    Where would one be able to determine if they in fact have low MGMT protein expression?

    I'm currently being considered for this treatment for an agressive GH secreting tumor.

    ReplyDelete
  4. Hi there, does anyone know the answer to the above question?

    thanks.

    ReplyDelete
  5. It looks like it's in a clinical trial phase. WHy don't you go here and contact them?

    http://clinicaltrials.gov/ct2/show/NCT00601289

    Good luck! Let us know what you find out.

    ReplyDelete

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