POST treatment with Zometa, or any biphosphonate

[RobinP]

THIS QUESTION POST IS ONLY FOR EARLY STAGE BREAST CANCER, NOT METS

I am not a fan of Zometa and the biphosphonates, despite the fact they are suppose to help prevent bone mets. I was on Actonel for four years but stopped due to my fears of jaw osteonecrosis, as the longer you are on biphosphonates,the higher the risk for osteonecrosis side effects.

Just curious, but how many of you have started biphosphonates post treatment recently with the news that these drugs decrease bone mets? Also, has anyone else stopped treatment after four years of being on oral bone building drugs due to fear of jaw rotting?

PS There is an expotential terminal half life of biphos. drugs, where they never completely leave the bone once deposited. Also, if you're on these drug you better make sure you are taking calcium 1500 mg a day and at least 800mg of vit D or you could do your bones worse damage.

[dlaxague]

Hi Robin,

I haven't taken these drugs, so can't answer your question. But I have a tag-along question to add to yours.

In the study most recently reported, which was of premenopausal women doing ovarian suppression and Tamoxifen or an AI plus Zometa every 6 months, there was a decrease in all mets by 36%, not just bone (a surprise to almost everyone). In addition, there were no reports of osteonecrosis of the jaw. But that's just one study.

I don't know if there's a relationship between ONJ and bisphosphonate dose, but I would suspect that to be true. There has been a very wide dose range especially when the drugs are given to women with active bone mets. I think that more recently, most oncs have backed off from the more frequent dose interval when administering bisphosphonates.

So when answering Robin's question, would you also say what bisphosphonate and what dose (if known) and how often you take (or took) it?

Debbie Laxague

[Gerri]

Hi Robin,

Since I just started on Zometa last August, I was struck by your post on another thread:

"I'm NOT doing Zometa, nor would I ever do Zometa, unless I had bone mets . You see Zometa has a ten percent chance of causing osteonecrosis of the jaw(Jaw bone rotting and death), which is resistant to treatment."

Where did you get that number? I did a brief search of the internet and couldn't come up with anything more recent than 2006, but found nothing with statistics. I'm sure if I spent more time I would be able to find something but I was hoping you could provide a link to your stats. I did find this on the ADA website http://www.ada.org/prof/resources/to...eonecrosis.asp

My reasons for Zometa: I was on Tamoxifen for two years and finally went into menopause. Now that I could finally switch to an AI, I asked to be put on Femara. My onc did not do a bone density test until I requested it after the first three months on Femara (she felt I was "covered" because Tamoxifen builds bones). The results were that I had osteopenia of the lumbar spine. I had read research about the benefits of Femara and Zometa and asked to start on Zometa. I had my first (and so far only ) dose in August. I am scheduled for another in Feb(sorry don't know the dosage).

I hope that this is a topic that will be discussed in San Antonio this December. For now I am going to sit back and wait to see what current reseach shows. I plan on having dose number two unless something definitive comes out to show me that the risks outweigh the benefits.

Thanks for starting this thread. I am sure it will generate a lot of interest.

[RobinP]

Gerri, I had osteopenia of the hips and took the Actonel for a while, but I don't think I would ever do Zometa for oestopenia, due to the risk of osteonecrosis. It was probably good that I take Actonel for four years,not only to build bones, but to help decrease any bone mets. I need to recheck my bone density soon to see what's going on there.


No, I don't have the ten percent risk articles in front of me now, but the risk I have read for intravenous biphosphonates is around 10%, while the risk for oral was low at 2%.

Note, I was was only aware that bisphosphonates decrease bone mets:
BREAST CANCER — Bisphosphonates have several potential uses in women with breast cancer:

• Prevention or delay in skeletal complications, as well as palliation of bone pain in patients with documented bone metastases

• Preventing the appearance of bone metastases in patients with high-risk early stage disease (ie, those receiving adjuvant treatment)

• Prevention of the bone loss that accompanies adjuvant systemic therapy

[dlaxague]

I can't find the full text of Paul Gnant's study that I mentioned below. He presented it at ASCO in 2008. Here's one snip from the press release that was reported many places:

"The new study involved 1,800 premenopausal women taking hormone treatments for early-stage breast cancer. Zometa cut by one-third the chances that cancer would recur -- in their bones or anywhere else." (my emphasis)

As for ONJ, the stats range from 1 to 10%, most being in between. The studies and articles that discuss dose, frequency, and route of administration note that the incidence is highest for those receiving the most frequent IV doses for long periods of time, for treatment of active bone mets. There are very few reports of ONJ after oral therapy.

And again, Gnant's study of the 1800 women above, given Zometa every six months IV (which was enough to decrease recurrence by 36%) has so far not had any ONJ. Here's one online article that noted that, in the bullets midway down:
http://professional.cancerconsultant....aspx?id=42046

Debbie Laxague

[StephN]

Hi -
I know the question is for those who did not have mets, but I am answering the osteonecrosis of the jaw question.

My med onc had a special interest in bones - their problems and treatment. I asked her earlier this year about taking Zometa again and she said "probably not necessary at this juncture since you already had so much and are NED."

Since I had taken the Zometa for so long, I was curious about the jaw reports. My med onc said she did not know of one patient at my cancer center who had that problem. I also asked my dentist who knew of the reports. Same answer - he said at the last conference he went to, there was ONE dentist who reported this problem and said that person had bad teeth and gums even before being treated.

This is not really an answer from a STUDY, but I HAVE been asking and these are the experiences of my big city doctors.

So I think the actual numbers are quite low.