After the allogeneic transplant was mightily intensified by an infusion of donor lymphocytes (my donor gave a second time for the DLI!), my old blood and marrow were gone. What I have now grew from my donor's cells, giving a whole new meaning to the farmer's tomato-adoring phrase, "home growner." I can no longer say things such as "my donor is recoloring my hair" because my actual donor isn't changing my hair: she's a resident physician in a hospital. So why is my hair lightening for summer? It's not as if my hair fell out and came back a different color, which happens all the time with chemotherapy: the color, now a golden brown, evolved over weeks.Again, nothing of my old blood and marrow system remains: blood type A- has become O+; the marrow itself, in nearly every bone in my body, is entirely from my donor, which also means that the blood and everything part of the blood and marrow system—biochemical signaling (e.g., cytokines), clotting, oxygenating, waste disposal, nourishment, and a multitude of other functions of which I know very little. My blood is no longer mine at all, except, I suppose, by right of possession, and most of us can remember how well asserting that principle of law worked out in The Maltese Falcon. (No, children, not the Millennium Falcon.)
Were I to be a trifle careless at a murder scene and spill a few drops of blood, my donor could be identified as a result of a DNA test. In the process, in passing, not of particular significance, I suppose, I also became female, or so saith the DNA. I've posted about that already.
This is a fascinating situation for a guy who has been wrangling with myeloma for fourteen years. I thought I had experienced all of it—the whole Borscht Belt of it—but nothing is easy. The problem lies in discourse: my donor is a real person somewhere. She isn't changing my hair color, or tearing up my fingernails, or demolishing my callouses. So, meet Eve, about whom I can say valid things without inadvertently making a reference to my donor, may she live a thousand years.
This whole subject would be a mere amusement if medical science knew it meant nothing to switch from male to female, A- to O+, live with a foreign marrow, and acquire a completely different DNA profile. However, some differences are significant and observable. I respond to at least one chemo drug to which I had grown resistant (Velcade). Eve is like a new patient who has never been exposed to anything other than the usual childhood diseases and an apple or two. However, because the cancer appears to be gone, I don't foresee having to use steroids in the future except when it is necessary to hold down the graft-versus-host-disease (GVHD), and certainly I'll need no chemotherapy. Eve doesn't have multiple myeloma. Over time, Eve is likely to drop many of her make-over projects as normal becomes redefined (e.g., when she stops hassling my liver).
But interesting thoughts return, probably of doubtful significance, but fascinating to me nevertheless. Although my donor had different parents, we are, in some sense, twins with identical DNA (I can't decide between fraternal or maternal twins). Because I test female, she has a twin-sister-like chimera in San Diego who shares no family resemblances: although, as things progress, perhaps in delicate light some changes in me might be noticed.
So the interesting question, crazy or not, is whether or not Eve is sentient. Is there an awareness somewhere, or is all of what is happening strictly biochemical or mechanical? We're in terra incognita again, because there are other possibilities than those two. If there is an awareness, surely it lives in the right hemisphere of the brain across the corpus callosum, the greatest bridge ever built by humankind. Eve and I don't share a thinking process of which I'm aware, so how would she make her awareness known to me, were she to desire to do so? Is awareness the same as identity? (Philosophers please comment.)
There are guidebooks of sorts. When I taught artificial intelligence, I learned from these books: Drawing on the Right Side of the Brain, as well as Zen and the Art of Motorcycle Maintenance. I read everything I could find on what happens to a person when the corpus callosum is severed.
So I told Eve what I wanted in several different ways. First, I simply asked her: she, after all, isn't separated from me by a damaged brain bridge. One of the lessons of a severed corpus collosum patient is that the left side has to use drawings or photographs or objects to talk to the right side. The right side recognizes items by touch, too. I didn't tell her what sign she might use to get my attention because I didn't know. Besides, I was feeling crazier by the second just trying to formulate the question properly.
Yes, I suspect, some of you think there's no difference between my two examples. One thing I can't demo is writing speed without a video. One day I'll fix that deficiency, too.
There are other possibilities than Eve's awareness that might explain all this, I admit, but Eve's way was certain to get my attention. One day, I plead, tell me somehow you are there, Eve. A day or two later, I acquired a new ability. I doubt very much if the quality of my writing has improved one jot, but the penmanship, speed, and spelling certainly have (although, at times, I do revert to chicken scratching when reaching for a word I can't spell).
Other than this bit of strangeness (that I am somewhat embarrassed to write about), I am slowly getting stronger, clearer minded, and more productive, but I can backslide for quite some time when the CMV is active or the GVHD is tearing up my liver. Eve doesn't respond well to prednisone: she reacts rather rudely to it. However, when combined with tacrolimus, that's all we have to fight GVHD. Fight the GVHD too hard, it releases the often-deadly CMV virus. Fight it too little and it goes after my liver. We scientist types call this situation a "deadly embrace", where neither side can find a way to get away from the other without horrific consequences. So we lighten the steroid, the CMV appears, we add Valcyte and up the steroid by 5mg or so, then wait a week. If everything goes the right direction, my doctor lowers the steroid by 5 again and we wait. Eventually, we hope, Eve will tire of attacking my liver, skin, GI tract, and other parts of me and the result will be a return to a semi-normal life.
I ache for that return.