Benefit of ongoing temozolomide in unmethylated GBM

  • 3 replies
  • 15 subscribers
  • 1174 views

Hi all, I'm guessing many of you know that temozlomide is much more effective in patients who have a methylated version of the MGMT gene. My wife's tumour doesn't have this and we could tell when the oncologist told us that it really does mean the surgery and the radiotherapy are the two main weapons that they can use. She's just finished her second cycle of standalone temozolomide and whilst it doesn't cause sickness (thank goodness) it does cause a lot of fatigue and we can also see from her blood test the impact it has on her immune system making her more vulnerable to infection. 

The fatigue isn't completely debilitating but she does a lot less for the first and second weeks of a cycle. We all know the clock is ticking with a GBM so I question whether it's worth losing all this time to the fatigue.

When we see the oncologist in 2 weeks I'm going to bring this up as from reading I'm not sure how much benefit the temozolomide is in people without the gene mutation. I think the difficult thing is that if we don't take it then it feels like we're giving up as there's so few other options. Link here to article written by the same people  who came up with the RT + temozolomide treatment used worldwide (Stupp protocol)  which they themselves question in patients with unmethylated MGMT. Though I should point out they're only suggesting withholding so that other things can be tried. Withholding temozolomide in glioblastoma patients with unmethylated MGMT promoter—still a dilemma? - PMC (nih.gov)

I just wondered if anyone else is having the same dilemma or has discussed it with their oncologist?

Thanks

Chris

Withholding temozolomide in glioblastoma patients with unmethylated MGMT promoter—still a dilemma? - PMC (nih.gov)

  • Hello Chris,

    i decided not to have the adjuvant temozolomide after reading the very article you quote here (and several others) My rationale was to try and maintain my present quality of life.

    The oncologist disagreed (he thinks some people with unmethylated tumours do respond) but has respected my decision. 

    i don’t think they really know. 
    “Whether TMZ can be omitted in unmethylated GBM cannot be answered definitively.”

    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7596890/

    Whatever you decide, I wish you and your wife all the best.  
    PS despite not taking the drug, I still suffer from fatigue but blood counts are good

  • HI Chris

    we faced a similar dilemma about three weeks ago after my husband's most recent MRI showed that there are two new active tumour areas and two potential areas.

    His initial GBM4 was methylated but he declined the TMZ only treatment after the 6 weeks of oral chemo/radiotherapy. There's been no testing done on the recent new tumours so unsure if they are methylated or not.

    The oncologist offered my husband TMZ (5 days on/23 days off) but qualified the offer by saying it only has a 1 in 3 chance of being effective at slowing the tumour growth. With TMZ he gave him  " 9-6 months or considerably less" - not great odds.

    He was given a week to decide what to do.and after much soul searching, he decided not to take the drugs. The risk of side effects and compromise to his current quality of life outweighed the benefits. Quality of life is far more important to him than longevity.

    This is a debate with no right or wrong answer...there's only what is best for each individual. It's a heartbreaking decision for anyone to face.

    When we advised the oncologist of the decision, he accepted it without question, leading me to suspect he too agreed in our situation it was the right one.

    love n hugs

    Wee Me xx

    Macmillan Support Line - 0808 808 00 00, 7 days a week between 8am-8pm

  • Thanks both for sharing your experiences. My wife had an MRI on Friday so we shall see what news that brings and then talk it all through with the oncologist.