Well, well. I should have known. Sometime before I was diagnosed with multiple myeloma in October of 2019, I was diagnosed with pernicious anemia. That’s a vitamin B12 deficiency that cannot be corrected by just taking a supplement. With a B12 deficiency, a dietary supplement can fix the problem, but pernicious anemia is a situation where B12 cannot be absorbed into the blood by ordinary means because of a missing intrinsic factor, a protein which is produced in the gut by gastric parietal cells. For me to get vitamin B12 into my bloodstream I need to inject it intramuscularly. I do it myself because I can’t be bothered to go to the Nursing Centre or somewhere where someone can do it for me. It’s a simple jab in the leg. No big deal, but for me it’s a life saver. As Martyn Hooper, the Founder and President of the Pernicious Anemia Society (PAS) in Britain, says it regarding his own experience: “Consequently, should I stop receiving injections then I would once again be unable to make healthy red blood cells and would gradually become anaemic and eventually die”*. Hooper was undiagnosed for years and has suffered permanent neural damage because of the delayed treatment. It’s a question of life or death. Pernicious anemia is called pernicious because it’s deadly. Just to add a bit of fun to it, it’s also incurable, just like myeloma. Towards the end of this post I specifically address the link between pernicious anemia and myeloma, but for now I need to deal with pernicious anemia.

As it turns out, I had been on monthly injections of B12 for years before about six months ago I let it slide. I ran out of B12 and just didn’t bother asking my GP for another prescription. Truth be told, I didn’t really feel as though the monthly injections were doing any good. Of course, my whole body was thrown into chaos by myeloma making it very difficult to pinpoint the source of any given issue I may be having, and there were lots of those. Frankly, I should never have stopped injecting B12, but it’s not going to do me much good to beat myself up about it. I’ve already spent enough time doing that.

About three weeks ago, after feeling like I’d been going downhill for some time, I called my GP’s office and requested a B12 blood test and a prescription for a new supply of it. This past Monday I went to the lab for my regular monthly blood workup in preparation for my chemo appointment today, but this time B12 was added to the assay. On Tuesday I got the results. No wonder I haven’t been feeling well, the level of B12 in my blood was way below the recommended amount. I came in at 84 pmol/L when the reference range is between 150 and 600. The literature I’ve scoured is inconclusive, but it seems that 150 is way too low for most people and 1000 is recommended by some sources for seniors to maintain good cognitive and neural health. In any case, my GP’s office contacted me this morning and told me that for the coming week I should inject B12 daily, for the following month, every week, and thereafter once a month. I’ll have to make sure the docs add B12 to my monthly blood assay so that I can ensure that I have the requisite amount in my blood. I think I’ll aim for 1000 pmol/L. If I can’t maintain that with a monthly injection, I’ll increase it to bi-monthly, etcetera. 

I haven’t conducted a scientific poll, but I doubt that most people know about how important vitamin B12 is for good health. B12 is crucial for the production of red blood cells. B9 (folate) is also important as is D3 but these can be easily supplemented. It’s worth doing an internet surf to find out more about B12 especially if you’re feeling chronically tired for no reason. I think the PAS is a great source but there are others, lots of them. The challenge is to recognize the stupid sites and not use any of their stupid suggestions or offers of stupid products. Make sure that if a site makes specific claims like methylcobalamin is better than cyanocobalamin get a second opinion. Martyn Hooper injects methylcobalamin twice a week (5mg/ml). It’s available online but it’s not cheap. He offers only one source for his assertion that methylcobalamin reduces peripheral neuropathy whereas cyanocobalamin doesn’t, and that paper¹ is about ALS and methylcobalamin in megadoses. I generally trust Hooper, but we all make mistakes and sometimes we get headstrong about our own health and how to manage it. Hooper has good reason to be pissed at the medical profession, and the medical establishment in Britain and if you read his very accessible books you’ll know why.

Now we get to the fun part…the one with no conclusive argument: the relationship of pernicious anemia with multiple myeloma. So far, very little research has been conducted on the links between pernicious anemia and myeloma. This article does address the issue but is ambivalent in its findings as you can ascertain from this quote:

For multiple myeloma, increased risk was seen only with pernicious anemia, an inflammatory condition in the stomach leading to vitamin B12 deficiency. This association was also demonstrated in two other large studies, which found few other autoimmune conditions associated with multiple myeloma.^16, 17 Because of the lack of association with other autoimmune conditions, our finding may point towards the involvement of vitamin B12 deficiency. Indeed, vitamin B12 deficiency has been reported in patients with multiple myeloma and in patients with the precursor condition, monoclonal gammopathy of undetermined significance.^16–19, 46 Although multiple myeloma may cause vitamin B12 deficiency by consuming stored vitamin B12,⁴⁷ we speculate that vitamin B12 deficiency could promote the development of multiple myeloma by causing derangement of one-carbon metabolism, as proposed in other cancers.^48 2

See citation below.

This study³ shows a more significant association between myeloma and pernicious anemia: “Using a large population-based dataset, we observed a 3-fold significantly increased risk of MM among subjects with a personal history of pernicious anemia, which has been found in previous studies.” Now, that got my attention. It’s clear that I had pernicious anemia before I had myeloma – at least that’s what I think. However, because I wasn’t diagnosed with myeloma for a long time before I contracted the disease it may be that I had both pernicious anemia and myeloma at the same time. 

All I know is that pernicious anemia and multiple myeloma share a whole load of effects and they are both incurable and fatal if not treated. I’ll let you know how my current B12 therapy goes. Right now it’s being affected by today’s injection of Daratumumab. Oh well. I always liked a puzzle.

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* from: What You Need to Know About Pernicious Anaemia and Vitamin B12 Deficiency by Martyn Hooper, Chris Steele)

¹Izumi Y, Kaji R. Clinical trials of ultra-high-dose methylcobalamin in ALS. Brain Nerve 2007:59 (10): 1141-1147.

²  Lesley A. Anderson, Shahinaz Gadalla, Lindsay M. Morton, Ola Landgren, Ruth Pfeiffer, Joan L. Warren, Sonja I. Berndt, Winnie Ricker, Ruth Parsons, Eric A. Engels. Population-based study of autoimmune conditions and the risk of specific lymphoid malignancies. International Journal of Cancer. Volume 125, Issue2, 15 July 2009, Pages 398-405

³Ola Landgren, Martha S. Linet, Mary L. McMaster, Gloria Gridley, Kari Hemminki, Lynn R. Goldin. Familialcharacteristics of autoimmune and hematologic disorders in 8,406 multiple myeloma patients: A population-based case-control study. Int J Cancer 2006 Jun 15;118(12):3095-8.