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how much exposure actually causes meso? my mom had just one job

Family · · 29 views
So I've been reading everything I can find about asbestos and honestly it's making me more anxious instead of less. My mom worked at a manufacturing plant in Tempe for like 3 years back in the 80s, that's it. Just one job. And now she's Stage III pleural meso. I keep thinking if she'd only worked there 2 years instead of 3 would this not have happened? Or is there just no safe amount and I'm driving myself crazy looking for a threshold that doesn't exist.

I teach fifth graders so I'm used to looking stuff up but this is different because the answer actually matters to me and I can't find a straight answer anywhere. Is it the intensity of exposure or the length of time or both? Because some people I've read about worked for decades and didn't get it and my mom was just there three years and got diagnosed at 67.

I'm not trying to blame her or anything I just need to understand if there's a point where you're safe or if everyone who was exposed just has to wait and see. Sorry if this is a dumb question. I'm just trying to make sense of why this happened to her and not to other people who were around asbestos longer.

10 Replies

Family
I get why you're looking for that threshold, I really do. We did the same thing when my dad was diagnosed in March. Like if we could just identify the magic number of fibers or years that made it "safe" then we could retroactively undo it somehow. But honestly the research doesn't work that way and it's frustrating.

What I've learned working in healthcare and now managing my dad's palliative care is that asbestos exposure is kind of like radiation exposure in terms of individual variability. There's no safe threshold we know of, but there's also huge differences in how bodies respond. Some people inhale a ton of fibers and their lungs never develop mesothelioma. Others get sick from much less. It probably comes down to genetics, how deeply those fibers lodged in the pleural lining, concurrent exposures, smoking history, immune function at the time. We don't fully understand the mechanism yet.

Three years in a manufacturing plant in the 80s when regulations were basically nonexistent? That's absolutely enough for occupational exposure to cause this. It's not about whether she worked long enough to "deserve" it or something. One significant exposure event can sometimes be enough if the conditions are right.

The hardest part is that you can't change it now and there's no "if only she'd worked two years instead of three" that would've prevented this. I wish I had better answers for you. My dad's Stage IV and we're on palliative care now and some days I still find myself wondering the same thing you're wondering about your mom.
Family
Yeah, the radiation comparison actually helps somehow. I think part of me wants there to be a magic number because then at least I could understand it, you know? Like if I could point to something and say "okay, three years at that plant was the tipping point," it would feel less random. But it does feel random right now and that's what's killing me.

How long was your dad exposed? I'm trying to figure out if I should be asking my mom's doctors different questions or if I'm just going to drive myself crazy either way.
Family
honestly i've been down this exact rabbit hole and it just made things worse for me. the truth is nobody can tell you a safe amount because there isn't one, and that's the hardest part to accept but also kind of the only thing that helps stop the spiraling.
Medical ✓ Expert Response
What you're going through makes complete sense. That need to find the logic in something that feels so random... I've sat with so many families asking this exact question and it never stops being a hard one.

So here's what I've seen in 12 years of oncology work and what the research actually shows. There genuinely isn't a safe threshold. The World Health Organization has said that pretty clearly, and it's one of those answers that feels worse, not better, when you first hear it. Some people with 30 years of heavy exposure never develop meso. Some people, like your mom, had a shorter window and did. The current thinking is that it's a combination of intensity of exposure, individual biology, and honestly some factors researchers are still working to understand. A 2020 analysis out of the Collegium Ramazzini found that even brief high-intensity exposures carry meaningful risk, which sounds like it might apply to manufacturing work in that era.

But I want to gently name something. The search for a threshold, the "what if it had been 2 years," that's grief doing what grief does. It's trying to find a handle on something that feels completely out of your hands. I've seen journaling help people work through that specific loop, writing out the question until it sort of exhausts itself.

If this is keeping you up at night I really do think talking to someone one on one would help more than another research tab. Your feelings about this deserve more than a forum can give them.
3 found this helpful
Family
Yeah okay so that's kind of what I was afraid of but also somehow it helps to hear someone actually say it instead of me just spiraling about it. The "no safe threshold" thing is terrifying but at least it's not my fault for not finding the magic number, you know? Like I can stop torturing myself trying to figure out what went wrong with her specific exposure.

I guess I just needed permission to stop researching and start actually being present with her instead of reading studies at 11pm every night. Thank you for that.
Family
honestly i've been down this exact rabbit hole and it only made me feel worse so i'm gonna tell you what helped me stop. my mom worked at that same manufacturing plant in tempe actually, different department but same era. when she got diagnosed last august i spent like two weeks googling "safe asbestos exposure levels" and "how much is too much" and just... there is no magic number. that's the thing nobody tells you clearly and it drives you insane.

what my oncologist finally explained to me is that it's not really about dose or time in the way we want it to be. some people get sick quick, some people work with asbestos for decades and nothing happens, some people have minimal exposure and develop meso at 70. it's partly genetics, partly luck, partly how bad the conditions were at that specific workplace. my mom was only there three years but apparently the plant had really bad ventilation in her area and she brought fibers home on her clothes. we didn't know that until after the diagnosis.

the hardest thing i've had to accept is that there probably wasn't a threshold where she would have been safe. one year wouldn't have saved her. two years wouldn't have. that's not comforting but it also means you can stop blaming the timeline and just focus on what you can actually do now which is getting her good treatment and taking care of yourself because this caregiving thing is brutal.

i'm juggling teaching full time and driving her to chemo appointments and some days i just sit in my car after school and cry. but then she'll make a joke or i'll have a good day with my class and i remember i can't fix what happened but i can show up for her now. that matters more than understanding why.
Family
I get why you're doing this because I do the same thing at like 10pm when I can't sleep. Reading everything and trying to find the magic number that would've changed things. But honestly the more I read the more I realize there isn't one.

My mom's pulmonologist told us something that actually helped a little bit. He said asbestos exposure is kind of like... it's not about whether you were exposed, it's about what your body did with it. Some people's immune systems clear it out better. Some people have genetics that make them more susceptible. Some people just got unlucky. There's no threshold where you worked exactly 2.5 years and you're fine but 3 years and you're not. That's not how it works.

What got to me was finding out that my mom didn't even know she was being exposed back then. She worked in an office area of that plant in Tempe and didn't think it was relevant when she first talked to her doctor about chest pain. Like she didn't put the two things together because it was just a regular job and nobody told her to be worried about it. When we finally got her records the asbestos exposure was way more significant than she remembered.

I stopped trying to find the threshold around October because it was making me worse, not better. I was snapping at my students which is not fair to them and it wasn't changing anything about her diagnosis anyway. Some of my coworkers think I should have a therapist and they're probably right. The "why her and not someone else" question is the one that's gonna drive you crazy if you let it.

The hard part is just accepting that exposure happened and now we're dealing with what we're dealing with. I know that sounds like I'm giving up on understanding it but I'm kind of not.
Family
honestly i've been down this exact rabbit hole and it doesn't help. like i spent a whole weekend in august reading about fiber sizes and occupational exposure limits and none of it changed anything about my mom's diagnosis so i just... stopped. it was making me crazy.

what i did learn though is that it's not really about the math of it. my mom's oncologist at Mayo said some people's bodies just respond differently to asbestos exposure and genetics plays a huge role too. so yeah there's no magic threshold where you're suddenly safe. it's frustrating because our brains want that answer, right? we want to know the rules so we can figure out how things went wrong.

the worst part is reading about people who worked in asbestos factories for 40 years and never got sick and then your mom gets it after 3 years at a manufacturing plant and you're just like... why her. i think that's the real question we're all asking even if we phrase it differently.

what helped me stop spiraling was talking to her care team instead of google. they explained her specific pathology and that made it feel less like a random punishment and more like okay this is what we're dealing with now. the exposure happened decades ago, we can't change that, but we can focus on her treatment and getting her the best care possible.

i'm sorry you're going through this. it's okay to be angry about the unfairness of it even if there's no one to blame really.
Medical ✓ Expert Response
What you're describing, that desperate search for a threshold or a rule that explains why your mom and not someone else, is something I see so often with families in this situation. And I want to say clearly: there is no dumb question here.

So the honest answer is that researchers still don't have a clean dose-response model for mesothelioma the way they do for some other cancers. There's no "safe" level that's been established. What we do know is that intensity of exposure tends to matter more than duration, which is why someone who worked briefly in a high-dust environment can develop meso while a neighbor who worked decades in a lower-exposure setting didn't. A 2013 review in the American Journal of Industrial Medicine looked at this specifically and found enormous variability in individual susceptibility, possibly genetic factors, possibly just random chance in how fibers lodge in the pleura.

Three years versus two years almost certainly wasn't the variable. I know that's not the tidy answer you were hoping for.

What I'm noticing in your post is that you're doing what I call "backward problem-solving," trying to find the decision point where the outcome could have changed. In my 12 years working with oncology families I've watched that process eat people alive. The question doesn't have an answer that will bring relief. If anything it tends to deepen the grief.

Journaling specifically about what you're searching for and why sometimes helps surface what's underneath the research. And if this is persisting, talking to a counselor who works with medical families would really be worth your time.
3 found this helpful
Medical ✓ Expert Response
Not a dumb question at all. This is actually one of the hardest things to explain to families and I've spent a lot of time at the bedside trying to do exactly that.

The honest answer is there's no safe threshold. The IARC (International Agency for Research on Cancer) classified all forms of asbestos as Group 1 carcinogens, meaning no level of exposure has been established as safe. So the 2 years vs 3 years question... I understand why your brain goes there but it's not really how this works.

What we do know from the literature, specifically the work coming out of the Helsinki Criteria studies, is that it's a combination of fiber type, intensity of exposure, and individual biology. And that last part is what gets people. Two people in the same room breathing the same air for the same amount of time can have completely different outcomes because of genetic susceptibility factors we're still working to understand. The Carbone et al. research on BAP1 gene mutations has been particularly interesting on this front.

The latency period is also wild, 20 to 50 years between exposure and diagnosis is typical, which is why your mom presenting at 67 after an 80s exposure fits the pattern almost exactly.

You're not going to find a clean causal math equation here, and I know that's frustrating when you're someone who looks things up to find answers. Sometimes the answer really is "we don't fully know why her and not the woman who worked beside her for 20 years."

Please talk to her oncologist about any specific questions around her exposure history, it can actually matter for treatment planning and clinical trial eligibility.
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