Derivative chromosome 9 deletions in chronic myeloid leukemia

Posted by rob on July 27, 2004 under Uncategorized | Be the First to Comment

Derivative chromosome 9 deletions in chronic myeloid leukemia are associated with loss of tumor suppressor genes.
Leuk Lymphoma. 2004 Apr ; 45(4): 689-94
It has recently been postulated that the absence of a single tumor suppressor gene (TSG) allele can provide a selective advantage for an emerging tumor cell. We have characterized the precise extension of the deletion on der(9) in 20 chronic myeloid leukemia (CML) cases using FISH analysis with an appropriate set of BAC/PAC probes to attempt a better definition of TSGs encompassed by these genomic deletions. Chromosome 9 deletions on the der(9) were detected in 15 (75%) cases; the TSG PTGES gene was lost in 11 (73%) cases. Chromosome 22 deletions on der(9) were found in 18 (90%) of the analysed cases; two TSGs were found located inside the deleted sequences of chromosome 22: SMARCB1 and GSTT1. These TSGs were found deleted in 16 (89%) cases bearing deletions of chromosome 22. Fourteen (70%) patients were treated with IFN-alpha therapy: 12 did not obtain complete haematologic remission (CHR) and 2 were not evaluable for response. Therefore, the patients did not respond to the IFN-alpha treatment started Glivec obtaining CHR and major cytogenetic response (MCR). The observation that deletions on der(9) are associated with the loss of TSGs suggests their possible involvement in the CML outcome, mediated by a haplo-insufficiency mechanism.

http://www.hubmed.org/display.cgi?issn=10428194&uids=15160940

Effect of antisense VEGF cDNA transfection on the growth of chronic myeloid leukemia K562 cells

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Effect of antisense VEGF cDNA transfection on the growth of chronic myeloid leukemia K562 cells in vitro and in nude mice.
Leuk Res. 2004 Jul ; 28(7): 763-9
To further elucidate the role of vascular endothelial growth factor (VEGF) in the pathogenesis of chronic myeloid leukemia (CML), we transfected K562 cells with a VEGF(121)cDNA sense vector (S), an antisense (AS) vector or vector (V) alone. The growth of transfected cells was investigated by MTT and colony-formation assays, and apoptosis was measured by flow cytometry (FCM) of Annexin-V-FITC/PI dual labeled cells. Transfected cells were subcutaneously transplanted into nude mice and the microvessel density (MVD) of tumor masses was determined by vWF immunohistochemistry staining. We tested the supernatant of different transfected K562 cells against human bone marrow endothelial cells (BMECs), and examined the synergic effects of antisense VEGF(121)cDNA and IFNalpha or STI571 on the proliferation and apoptosis of K562 cells. We found that K562/AS transfectants exhibited a 49% reduction in VEGF secretion, whereas K562/S transfectants exhibited a 3-fold increase in VEGF secretion, all in comparison to the vector controls. K562 cells transfected with antisense VEGF(121)cDNA showed growth retardation in vitro. In transplanted nude mice in vivo, transfection of implanted cells with antisense VEGF(121)cDNA resulted in decreased tumor MVD, and increased apoptosis in the presence of IFNalpha. Taken together, these results suggest that VEGF may be involved in the pathogenesis of CML through autocrine and paracrine mechanisms, and that anti-VEGF therapy alone or in combination with conventional treatment may be beneficial for CML patients.

http://www.hubmed.org/display.cgi?issn=01452126&uids=15158098

Allogeneic blood stem cell transplantation in chronic myeloid leukaemia-chronic phase

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Allogeneic blood stem cell transplantation in chronic myeloid leukaemia-chronic phase following conditioning with busulphan and cyclophosphamide: a follow up report.
Natl Med J India. 2004 Mar-Apr ; 17(2): 71-3
BACKGROUND: Allogeneic bone marrow transplantation (BMT) or peripheral blood stem cell transplantation remains the only modality of treatment that can eradicate a leukaemia clone in the majority of patients with chronic myeloid leukaemia (CML). However, the advent of the targeted molecule imatinib mesylate (formerly STI-571) against the bcr-abl chimeric protein in the disease has brought the issue of managing newly diagnosed CML patients, especially those with available donors, to the crossroads. Although the curative potential of this agent remains unknown, it can produce complete cytogenetic response in > 60% of newly diagnosed patients. METHODS: From May 1991 to October 2002, a total of 55 Ph+ CML-chronic phase patients received oral busulphan 16 mg/kg and cyclophosphamide 120 mg/kg i.v. as a conditioning regimen. All patients received human leucocyte antigen (HLA)-identical sibling donor haematopoletic stem cells–bone marrow in 41 patients (74.5%) and peripheral blood stem cells in 14 (25.4%). Post-transplant prophylaxis for graft-versus-host disease included a short course of methotrexate (on days +1, +3, +6 and +11) and cyclosporin till day +180 in 38 patients (69.1%), while a combination of cyclosporin and methylprednisolone was used in the remaining 17 (29%). RESULTS: At a median follow up of 48 months (10-144 months), 26 patients (47.3%) are alive. Early mortality (100-day) occurred in 17 patients (30.9%). Acute graft-versus-host disease developed in 37 patients (67.3%), and was grade IV in 6 of them. Chronic graft-versus-host disease developed in 17 patients (30.9%). Relapse occurred in only 2 patients (3.6%) till date. The leukaemia-free survival is 64.3% in the peripheral stem cell group, whereas it is 41.5% in the bone marrow recipient group. CONCLUSION: Allogeneic BMT appears to result in eradication of CML and ensure disease-free survival in about half the patients. However, efforts should be made to prevent graft-versus-host disease and minimize early mortality.

http://www.hubmed.org/display.cgi?issn=0970258X&uids=15141598

Caenorhabditis elegans ABL-1 antagonizes p53-mediated germline apoptosis

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Caenorhabditis elegans ABL-1 antagonizes p53-mediated germline apoptosis after ionizing irradiation.
Nat Genet. 2004 Jul 25; ():
c-Abl, a conserved nonreceptor tyrosine kinase, integrates genotoxic stress responses, acting as a transducer of both pro- and antiapoptotic effector pathways. Nuclear c-Abl seems to interact with the p53 homolog p73 to elicit apoptosis. Although several observations suggest that cytoplasmic localization of c-Abl is required for antiapoptotic function, the signals that mediate its antiapoptotic effect are largely unknown. Here we show that worms carrying an abl-1 deletion allele, abl-1(ok171), are specifically hypersensitive to radiation-induced apoptosis in the Caenorhabditis elegans germ line. Our findings delineate an apoptotic pathway antagonized by ABL-1, which requires sequentially the cell cycle checkpoint genes clk-2, hus-1 and mrt-2; the C. elegans p53 homolog, cep-1; and the genes encoding the components of the conserved apoptotic machinery, ced-3, ced-9 and egl-1. ABL-1 does not antagonize germline apoptosis induced by the DNA-alkylating agent ethylnitrosourea. Furthermore, worms treated with the c-Abl inhibitor STI-571 (Gleevec; used in human cancer therapy), two newly synthesized STI-571 variants or PD166326 had a phenotype similar to that generated by abl-1(ok171). These studies indicate that ABL-1 distinguishes proapoptotic signals triggered by two different DNA-damaging agents and suggest that C. elegans might provide tissue models for development of anticancer drugs.

http://www.hubmed.org/display.cgi?issn=10614036&uids=15273685

Pic Of The Day

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Fort Jefferson, the largest Civil War-era coastal fort in the United States known as the ‘Gibraltar of the Gulf,’ is battling for survival before its storied history crumbles into the sea. The 158-year-old fortress is located on a tiny island 68 miles west of Key West in the Florida Keys and is part of the 23-acre Garden Key atoll in the Dry Tortugas National Park, a cluster of seven low-lying islands.

Differentiating juvenile myelomonocytic leukemia from chronic myeloid leukemia

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Differentiating juvenile myelomonocytic leukemia from chronic myeloid leukemia in childhood.
J Pediatr Hematol Oncol. 2004 Apr ; 26(4): 236-42
Juvenile myelomonocytic leukemia (JMML) is a rare clonal myeloproliferative disease of early childhood. To determine the diagnostic features, appropriate treatment, and overall patient survival pertaining to JMML for children, the authors reviewed the clinical data of 16 children with JMML admitted to the National Taiwan University Hospital between 1978 and 2001. Median age at diagnosis was 2.5 years. Fever was the most common symptom at diagnosis. At initial presentation, the mean white blood count and absolute monocyte count were 30 x 10(9)/L and 4.5 x 10(9)/L, respectively. Cytogenetic analysis was performed in 14 patients, and 2 patients (14%) had monosomy 7. Another patient, with normal karyotype at diagnosis, had deletion of 7q22 at the follow-up chromosome study. Forty-seven chronic myeloid leukemia (CML) patients were also diagnosed and followed at the same hospital during the same interval period. The age, leukocyte counts, platelet counts, basophil counts, monocyte percentages on peripheral blood smears, and median survival rate showed significant differences between JMML and CML patients (P < 0.05). The median survival was 10 months and the probability of 10-month survival was 0.38 by Kaplan-Meier analysis for 12 of the 16 JMML patients who did not receive hematopoietic stem cell transplantation (HSCT). Among three patients receiving HSCT, one patient relapsed 9 months after the first HSCT and was treated successfully by a second HSCT from the same sibling donor.

http://www.hubmed.org/display.cgi?issn=10774114&uids=15087951

Uncommon karyotypic abnormality, t(11;19)(q23;p13.3), in a patient with blastic phase

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Uncommon karyotypic abnormality, t(11;19)(q23;p13.3), in a patient with blastic phase of chronic myeloid leukemia.
Cancer Genet Cytogenet. 2004 Apr 15; 150(2): 159-63
We describe unusual cytogenetic findings in a 33-year-old male with blastic phase of Philadelphia chromosome (Ph)-positive chronic myeloid leukemia. In addition to the t(9;22)(q34;q11), which was detected in all metaphases, a t(11;19)(q23;p13.3) was also identified as an evolutional change in all 20 metaphases. Fluorescence in situ hybridization (FISH) analysis showed that fusion signals of the ABL/BCR probes were found in 95% of blastic cells. Southern blotting and FISH analysis also revealed involvement of the MLL gene on 11q23. Clinical course was aggressive and the patient responded poorly to therapy. These findings suggest an association between Ph and 11q23 with poor prognosis, and that t(11;19)(q23;p13.3) was the essential pathogenic factor in our case.

http://www.hubmed.org/display.cgi?issn=01654608&uids=15066325

Clinical results with imatinib in chronic myeloid leukaemia

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Clinical results with imatinib in chronic myeloid leukaemia.
Leuk Res. 2004 May ; 28 Suppl 1(): S3-9
Since its introduction 5 years ago, imatinib mesylate has shown remarkable efficacy in treating patients with chronic myeloid leukaemia. Here we shall review the clinical results seen with imatinib at all stages of the disease, current views on the best way to monitor patients’ responses and potential ways of predicting response to treatment. We shall also briefly cover the reasons why quiescent stem cells pose a theoretical threat to successful treatment.

http://www.hubmed.org/display.cgi?issn=01452126&uids=15036936

Graft-versus-leukemia in a retrovirally induced murine CML model

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Graft-versus-leukemia in a retrovirally induced murine CML model: mechanisms of T-cell killing.
Blood. 2004 Jun 1; 103(11): 4353-61
The graft-versus-leukemia (GVL) effect, mediated by donor T cells, has revolutionized the treatment of leukemia. However, effective GVL remains difficult to separate from graft-versus-host disease (GVHD), and many neoplasms are GVL resistant. Murine studies aimed at solving these problems have been limited by the use of leukemia cell lines with limited homology to human leukemias and by the absence of loss-of-function leukemia variants. To address these concerns, we developed a GVL model against murine chronic-phase chronic myelogenous leukemia (mCP-CML) induced with retrovirus expressing the bcr-abl fusion cDNA, the defining genetic abnormality of chronic-phase CML (CP-CML). By generating mCP-CML in gene-deficient mice, we have studied GVL T-cell effector mechanisms. mCP-CML expression of Fas or tumor necrosis factor (TNF) receptors is not required for CD8-mediated GVL. Strikingly, maximal CD4-mediated GVL requires cognate interactions between CD4 cells and mCP-CML cells as major histocompatibility complex-negative (MHC II(-/-)) mCP-CML is relatively GVL resistant. Nevertheless, a minority of CD4 recipients cleared MHC II(-/-) mCP-CML; thus, CD4 cells can also kill indirectly. CD4 GVL did not require target Fas expression. These results suggest that CPCML’s GVL sensitivity may in part be explained by the minimal requirements for T-cell killing, and GVL-resistance may be related to MHC II expression.

http://www.hubmed.org/display.cgi?issn=00064971&uids=14982874

Immunological effects of donor lymphocyte infusion in patients with chronic myelogenous leukemia

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Immunological effects of donor lymphocyte infusion in patients with chronic myelogenous leukemia relapsing after bone marrow transplantation.
Braz J Med Biol Res. 2004 Feb ; 37(2): 201-6
Allogeneic bone marrow transplantation (alloBMT) is the only curative therapy for chronic myelogenous leukemia (CML). This success is explained by the delivery of high doses of antineoplastic agents followed by the rescue of marrow function and the induction of graft-versus-leukemia reaction mediated by allogeneic lymphocytes against host tumor cells. This reaction can also be induced by donor lymphocyte infusion (DLI) producing remission in most patients with CML who relapse after alloBMT. The immunological mechanisms involved in DLI therapy are poorly understood. We studied five CML patients in the chronic phase, who received DLI after relapsing from an HLA-identical BMT. Using flow cytometry we evaluated cellular activation and apoptosis, NK cytotoxicity, lymphocytes producing cytokines (IL-2, IL-4 and IFN-gamma), and unstimulated (in vivo) lymphocyte proliferation. In three CML patients who achieved hematological and/or cytogenetic remission after DLI we observed an increase of the percent of activation markers on T and NK cells (CD3/DR, CD3/CD25 and CD56/DR), of lymphocytes producing IL-2 and IFN-gamma, of NK activity, and of in vivo lymphocyte proliferation. These changes were not observed consistently in two of the five patients who did not achieve complete remission with DLI. The percent of apoptotic markers (Fas, FasL and Bcl-2) on lymphocytes and CD34-positive cells did not change after DLI throughout the different study periods. Taken together, these preliminary results suggest that the therapeutic effect of DLI in the chronic phase of CML is mediated by classic cytotoxic and proliferative events involving T and NK cells but not by the Fas pathway of apoptosis.

http://www.hubmed.org/display.cgi?issn=0100879X&uids=14762574

CNS blast crisis of chronic myelogenous leukemia in a patient with a major cytogenetic response

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CNS blast crisis of chronic myelogenous leukemia in a patient with a major cytogenetic response in bone marrow associated with low levels of imatinib mesylate and its N-desmethylated metabolite in cerebral spinal fluid.
Ann Hematol. 2004 Jun ; 83(6): 401-2
Imatinib mesylate (STI571) is a very effective treatment option for Ph(+) chronic myeloid leukemia (CML) in chronic phase. Secondary treatment failures have mostly been observed in patients with advanced stages of disease. We report the case of a patient who unexpectedly experienced blast crisis of the central nervous system although having achieved complete cytogenetic remission in the bone marrow. The levels of STI571 and its metabolite N-desmethyl STI were 40-fold lower in the cerebral spine fluid than in plasma. The risk of CNS disease has to be kept in mind when patients with CML in chronic phase who are at an increased risk for blastic transformation are treated with imatinib mesylate.

http://www.hubmed.org/display.cgi?issn=09395555&uids=14673623

The graft-versus-leukemia effect of nonmyeloablative stem cell allografts may not be sufficient to cure CML

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The graft-versus-leukemia effect of nonmyeloablative stem cell allografts may not be sufficient to cure chronic myelogenous leukemia.
Bone Marrow Transplant. 2003 Nov ; 32(9): 897-901
We treated 12 patients with chronic myelogenous leukemia (CML) with a low-intensity preparative regimen followed by allogeneic stem cell transplantation in an attempt to confer a curative graft-versus-leukemia (GVL) effect with minimum morbidity. Seven patients in first chronic phase (CP1) and five in second chronic phase (CP2) (age 15-68 years) received a nonmyeloablative conditioning regimen of fludarabine and cyclophosphamide, followed by a G-CSF-mobilized peripheral blood stem cell (PBSC) transplant from an HLA-identical sibling. Cyclosporine (CsA) was used for graft-versus-host disease (GVHD) prophylaxis. Median follow-up was 384 days. Neutrophil recovery occurred at a median of 12 days. There was no transplant-related mortality. Of the seven CP1 patients transplanted, seven achieved a stable molecular remission; two with no post-transplant intervention, three after donor lymphocytes, imatinib and interferon, and two after a myeloablative stem cell transplant. Four of five CP2 patients died in blast crisis and one survived in molecular remission. Of the 12 patients with durable engraftment, six had Grades II-IV acute GVHD; six had limited chronic GVHD. These results suggest that cytoreduction is required to optimize the curative effect of allogeneic stem cell transplantation for CML.

http://www.hubmed.org/display.cgi?issn=02683369&uids=14561990

Current clinical management of gastrointestinal stromal tumors.

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Current clinical management of gastrointestinal stromal tumors.
Expert Rev Anticancer Ther. 2004 Aug ; 4(4): 595-605
Gastrointestinal stromal tumors (GIST) are defined as c-KIT-positive mesenchymal neoplasias located in the gastrointestinal tract and abdomen, most of which present an activating KIT mutation, a fundamental step in the development of disease. However, recent studies reported a small subgroup of KIT-negative GIST, in which platelet-derived growth factor receptor A, protein kinase C-tau, and FLJ10261 expression was detected. Imatinib (Gleevec((R)), Novartis) is an orally administered competitive inhibitor of the tyrosine kinase domain of receptors such as KIT, ABL, and BCR-ABL fusion proteins, and the platelet-derived growth factor receptor. Phase I-III clinical trials have demonstrated the efficacy of imatinib in the treatment of metastatic GIST. However, the optimal dose and role of imatinib in an adjuvant or neoadjuvant setting have yet to be defined. Therefore, further studies investigating the mechanism of resistance to imatinib in patients with GIST are warranted.

http://www.hubmed.org/display.cgi?issn=14737140&uids=15270663

Thymic carcinoma with overexpression of mutated KIT and the response to imatinib

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Thymic carcinoma with overexpression of mutated KIT and the response to imatinib.
N Engl J Med. 2004 Jun 17; 350(25): 2625-6

 

http://www.hubmed.org/display.cgi?issn=15334406&uids=15201427

Pic Of The Day

Posted by rob on July 26, 2004 under Uncategorized | Be the First to Comment

A family gets their feet wet at Sabinillas Beach in southern Spain on a hot summer day.

A cancer patient’s struggle – Trial &Error

Posted by rob on July 25, 2004 under Uncategorized | Be the First to Comment

July 25, 2004, 1:19AM

A cancer patient’s struggle

Trial &Error

Searching for information on drug trial held in Houston becomes a study in frustration

By JIM SHAHIN
Copyright 2004 Houston Chronicle News Service

 

I’ll bet a story about drug companies keeping information from the public isn’t most people’s idea of exciting news. But most people aren’t desperately trying to find the location of a clinical trial in the hopes that it might save their lives. After reading a recent newspaper account of how pharmaceutical companies routinely ignore a 1997 law designed to create a list of ongoing clinical trials for new drugs, I raced through the house, whooping ecstatically.

The story about the Food and Drug Administration’s registry of clinical drug trials appeared in The Post a week after my cousin Connie Ojile and I had returned to Washington from Houston. We’d gone there to see whether Connie qualified for a clinical trial for a new leukemia drug. Before we went, I’d tried my damnedest to get an answer to this question: Is the trial being held anywhere besides Houston?

It would be much easier on Connie to undergo a trial closer to home. But try as I did, I couldn’t get the answer. Now I knew why. Not only were the companies flouting the law, they weren’t even required to register the kind of trial Connie was looking at — the very first, most preliminary trial to test a promising new experimental drug, the kind of trial that someone like Connie might be desperate to know something about.

The news — both elements of it — outraged me. But it also restored a bit of my dignity. I no longer felt inadequate for not getting the information Connie had wanted.

I cannot tell you how big a deal dignity is when you’re dealing with cancer.

Connie and I are old hands when it comes to leukemia. We know all about platelets and white blood counts and hemoglobin. If somebody forgets to give iodine before a certain test, we know to holler, “Hey, a little iodine over here.” We check the date on the chemo to make sure it hasn’t expired. That is, after we check the chemo label to make sure it’s the right stuff in the first place.

I was diagnosed with leukemia after my gums started bleeding and my back radiated with pain so searing I couldn’t sit up. That was 19 years ago, in 1985. Since then, I’ve had let’s see, a splenectomy, synthetic interferon, human interferon, something called 2-CdA (2-chlorodeoxyadenosine) and probably some stuff I’m just not remembering at the moment. Now I’m in remission. Remission, of course, is not cure, and I am proof of that: I’ve fallen out of remission three or four times, depending on how you define it.

Connie has it worse. That she has the disease at all is something that, personally, I think is weird — two first cousins with two different kinds of leukemia. She was diagnosed eight years ago with chronic myelogenous leukemia. CML, for short. (I had hairy cell leukemia. It’s an appropriate name; I’m a hairy guy.) Since then, she has undergone radiation, a bone marrow transplant, and more or less constant chemotherapy. She has yet to achieve remission.

Last month, Connie’s New York oncologist recommended she go to Houston to see if she qualified for a trial of a new drug that might put her into remission, or at least arrest her cancer’s advance. The trial was due to begin in just two weeks. Overwhelmed by the details of preparing

Connie called her doctor but couldn’t reach her.

The drug was called AMN107. Or maybe AMN-107. At the time, I didn’t know how to spell it because I couldn’t find out anything about it. With so little time before Connie had to decide whether to go to Houston, I was desperate to find any information I could. I searched for the drug under both spellings, with a hyphen and without one. Either way, it was as if it didn’t exist.

I searched the Web site of the manufacturer, Novartis, to no avail. I called the customer relations division, but the rep I spoke to hadn’t heard of AMN107 and couldn’t find it in her computer.

I called back and talked to a different representative. She didn’t know anything about the drug, either. She referred me to the Web site, which I’d already tried, and to its oncology section, which I’d also tried, and then to another site which, well, I tried, too: www.ClinicalTrials.gov.

That is where the Food and Drug Administration is supposed to keep a registry of the nation’s clinical trials. Guess what? No trials for AMN107 or AMN-107 were listed there.

Germany wasn’t what I had in mind

I tried Googling. I got a couple of things in German. The trial, it seemed, was also being conducted in Frankfurt. Not exactly the close-to-home location we were looking for.

I tried the Web sites of the National Institutes of Health and the National Cancer Institute. Those are the two primary government organizations that oversee research on diseases like leukemia. They don’t seem to have much idea of what clinical trials are going on in this country. Based on their Web sites, they didn’t know a thing about this one. I called a few leukemia and cancer organizations. Nothing.

Even the Web site of M.D. Anderson Cancer Center, the place conducting the trial Connie’s doc had told us about, didn’t have anything about it.

A rep at M.D. Anderson, though, did stay on the line with me and remained remarkably patient in the face of my increasing frustration. After first saying that perhaps I was mistaken about the name of the drug or the whereabouts of the trial, she discovered somewhere deep in the system that, by golly, M.D. Anderson did have a clinical trial for AMN107 after all.

I finally found a little information about the drug at a Web site run by and for CML patients, www.CMLwatch.org. They knew about it because a few of them were in the trial. They didn’t know, however, if a trial was being held anywhere other than Houston.

On top of it all, there are personal costs

Connie didn’t want to go to Houston. She doesn’t know a soul there.

Nowadays, Connie can’t work. Eight years of constant testing has made her anunstable employee. She’s wiped out financially. She does have Medicare and private insurance, but she’s been told that neither cover investigational trials.

The trial would last at least four weeks, maybe as long as eight. Typically, a manufacturer picks up the tab for the drug it is testing.

That’s it. Otherwise, a trial participant is responsible for all the costs: housing, food, travel and the many medical tests involved. How would Connie pay for it all?

It would be hell, going to Houston in the summer, alone, not knowing anybody, and getting long needles shoved through her bone and into her marrow. It would be hell, too, asking for money from her friends and family to help pay for the trip. But that is what she would have to do. She’d have to sell some of her stuff on consignment, and go with some stalwart hope that the clinical trial would have her.

How could I not find anything? This was, after all, a clinical trial for a potentially significant new drug. As time went on and the answer remained elusive, I began to wonder if it was subversive of me to even ask the question. Was it wrong for me to expect that drug companies might divulge information about their clinical trials so that desperate cancer patients might avail themselves of what could be their last chance?

The story I eventually read in The Washington Post about the FDA’s clinical trial registry showed me there was nothing wrong with my efforts. The story said that although drug companies conduct 80 percent of the trials going on in the country, they represented only 13 percent of the trials listed on ClinicalTrials.gov. That means that countless industry-sponsored trials weren’t listed. And that meant that it was improbable that I’d find an answer to my question. But beyond that, the law as written turned my search from difficult to more or less impossible. That’s because it only covers Phase 2 through 4 trials. It exempts Phase 1 trials. That’s the category AMN107 falls into.

A Phase 1 is known as a “safety” trial, while Phases 2 through 4 are considered “effectiveness” trials. What safety means, in this case, is that they keep jacking up the dosage to gauge your tolerance. They want to see how much you can take before you throw up. Or spike a fever. Or get the chills. Or suffer some combination of all three. It also means, more significantly, that they want to see if this stuff might actually work. Sometimes it does.

A Phase 1 trial requires a lot of testing to monitor the patient’s response to the drug. It could mean lots of painful intrusions, such as bone marrow biopsies. Yet it turns out that the very people who would submit to the expense and horrors of a Phase 1 trial — that is, the people in the worst shape — are, by law, the ones least likely to find out about them. People like Connie.

Eventually, a battery of tests in Houston

have no idea why the law would exempt Phase 1 trials. Maybe it’s a concern about their risky nature. Maybe it’s a bow to the industry’s fear of “poaching” — company B finding out what company A is doing. But that can happen at any stage of testing. Whatever the reason, that Phase 1 trials aren’t even included is, to me, a disgrace.

Connie went down to Houston on a Saturday. I followed the next day, so that she wouldn’t have to be alone at least for this first trip. When I arrived, she was pale. She told me she had had nonstop diarrhea and stomach cramps throughout the night. “I always get really anxious before big test days,” she said apologetically.

The next day, she endured a battery of tests just to see if she qualified to take the actual tests to get into the trial. The day after that, Tuesday, she met with a doctor who ran the clinical trial. He finally answered our question: Yes, M.D. Anderson is the only place in America conducting the trial for AMN107.

Answer received and decision made

Now, Connie could decide. Should she gamble that she wouldn’t get any worse any time soon, save her money, and hope that AMN107 went into the less intensive Phase 2, which might be held at hospitals around the country, reasonably soon? But what if her condition, which is already in the accelerated stage, shot into “blast” while she was waiting for Phase 2? The blast stage is not good. Coming back from blast is a little like raising Lazarus. It can be done, but it isn’t an everyday occurrence.

She called me after we returned home. “What do you think I should do?” she asked. “I don’t know,” I replied. “What do you think you should do?” She mentioned the high cost, the constant testing, the uncertain dosages and coping with the unknown side effects on her own. “I think I’ll wait,” she said. “I think I will be OK.”

We’re both holding our breath a little. I hope she’s right. It’s hard to tell, even for a couple of old leukemia hands like us.

But I hope, too, that she and the millions of others like her might someday have a registry that meets the spirit and the letter of the law, that enforces compliance and includes Phase 1 trials. For I do know that, when it comes to clinical trials, what you don’t know can’t help you.

Shahin is a freelance writer who lives in Silver Spring, Md.

http://www.chron.com/cs/CDA/ssistory.mpl/editorial/outlook/2700234

Pic Of The Day

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Laird Hamilton is seen surfing a Tahitian wave in the new documentary ‘Riding Giants’. Move over Michael Moore. With the director’s controversial ‘Fahrenheit 9/11′ cooling at box offices after $94 million in ticket sales in about four weeks, a new wave of documentaries is headed for audiences hungry for more than standard Hollywood popcorn.

Chronic myelogenous leukemia

Posted by rob on July 24, 2004 under Uncategorized | Be the First to Comment

Chronic myelogenous leukemia.

http://www.pmbrowser.info/pmdisplay.cgi?issn=08898588&uids=15271405

Accelerated and blastic phases of chronic myelogenous leukemia

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Accelerated and blastic phases of chronic myelogenous leukemia.

http://www.hubmed.org/display.cgi?issn=08898588&uids=15271404

Immunity to chronic myelogenous leukemia

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Immunity to chronic myelogenous leukemia.

http://www.hubmed.org/display.cgi?issn=08898588&uids=15271403