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Tan L, Sandhu S, Lee RJ, Li J, Callahan J, Ftouni S, Dhomen N, Middlehurst P, Wallace A, Raleigh J, Hatzimihalis A, Henderson MA, Shackleton M, Haydon A, Mar V, Gyorki DE, Oudit D, Dawson MA, Hicks RJ, Lorigan P, McArthur GA, Marais R, Wong SQ, Dawson SJ. Prediction and monitoring of relapse in stage III melanoma using circulating tumor DNA. Ann Oncol 2019; 30:804-814. [PMID: 30838379 PMCID: PMC6551451 DOI: 10.1093/annonc/mdz048] [Citation(s) in RCA: 94] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND The advent of effective adjuvant therapies for patients with resected melanoma has highlighted the need to stratify patients based on risk of relapse given the cost and toxicities associated with treatment. Here we assessed circulating tumor DNA (ctDNA) to predict and monitor relapse in resected stage III melanoma. PATIENTS AND METHODS Somatic mutations were identified in 99/133 (74%) patients through tumor tissue sequencing. Personalized droplet digital PCR (ddPCR) assays were used to detect known mutations in 315 prospectively collected plasma samples from mutation-positive patients. External validation was performed in a prospective independent cohort (n = 29). RESULTS ctDNA was detected in 37 of 99 (37%) individuals. In 81 patients who did not receive adjuvant therapy, 90% of patients with ctDNA detected at baseline and 100% of patients with ctDNA detected at the postoperative timepoint relapsed at a median follow up of 20 months. ctDNA detection predicted patients at high risk of relapse at baseline [relapse-free survival (RFS) hazard ratio (HR) 2.9; 95% confidence interval (CI) 1.5-5.6; P = 0.002] and postoperatively (HR 10; 95% CI 4.3-24; P < 0.001). ctDNA detection at baseline [HR 2.9; 95% CI 1.3-5.7; P = 0.003 and postoperatively (HR 11; 95% CI 4.3-27; P < 0.001] was also associated with inferior distant metastasis-free survival (DMFS). These findings were validated in the independent cohort. ctDNA detection remained an independent predictor of RFS and DMFS in multivariate analyses after adjustment for disease stage and BRAF mutation status. CONCLUSION Baseline and postoperative ctDNA detection in two independent prospective cohorts identified stage III melanoma patients at highest risk of relapse and has potential to inform adjuvant therapy decisions.
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Affiliation(s)
- L Tan
- Peter MacCallum Cancer Centre, Melbourne; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Australia
| | - S Sandhu
- Peter MacCallum Cancer Centre, Melbourne; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Australia
| | - R J Lee
- Molecular Oncology Group, Cancer Research UK Manchester Institute, Manchester; Faculty of Biology, Medicine and Health, The University of Manchester, Manchester
| | - J Li
- Peter MacCallum Cancer Centre, Melbourne; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Australia
| | - J Callahan
- Peter MacCallum Cancer Centre, Melbourne
| | - S Ftouni
- Peter MacCallum Cancer Centre, Melbourne
| | - N Dhomen
- Molecular Oncology Group, Cancer Research UK Manchester Institute, Manchester
| | - P Middlehurst
- Molecular Oncology Group, Cancer Research UK Manchester Institute, Manchester
| | - A Wallace
- Genomic Diagnostics Laboratory, Manchester Centre for Genomic Medicine, Manchester, UK
| | - J Raleigh
- Peter MacCallum Cancer Centre, Melbourne
| | | | - M A Henderson
- Peter MacCallum Cancer Centre, Melbourne; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Australia
| | | | | | - V Mar
- The Alfred Hospital, Melbourne
| | - D E Gyorki
- Peter MacCallum Cancer Centre, Melbourne; Department of Surgery, The University of Melbourne, Melbourne, Australia
| | - D Oudit
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester; The Christie NHS Foundation Trust, Manchester, UK
| | - M A Dawson
- Peter MacCallum Cancer Centre, Melbourne; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Australia; Centre for Cancer Research, The University of Melbourne, Melbourne, Australia
| | - R J Hicks
- Peter MacCallum Cancer Centre, Melbourne; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Australia
| | - P Lorigan
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester; The Christie NHS Foundation Trust, Manchester, UK
| | - G A McArthur
- Peter MacCallum Cancer Centre, Melbourne; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Australia
| | - R Marais
- Molecular Oncology Group, Cancer Research UK Manchester Institute, Manchester; Faculty of Biology, Medicine and Health, The University of Manchester, Manchester
| | - S Q Wong
- Peter MacCallum Cancer Centre, Melbourne
| | - S-J Dawson
- Peter MacCallum Cancer Centre, Melbourne; Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Australia; Centre for Cancer Research, The University of Melbourne, Melbourne, Australia.
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McLean L, Moore M, Mar V, Cebon J, Kelly J, Haydon A. 347PD BRAF mutation status – a good prognostic indicator in the era of targeted therapies? Ann Oncol 2015. [DOI: 10.1093/annonc/mdv528.04] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Abstract
Despite a strong correlation between telomerase activity and malignancy, the outcome of telomerase inhibition in human tumor cells has not been examined. Here, we have addressed the role of telomerase activity in the proliferation of human tumor and immortal cells by inhibiting TERT function. Inducible dominant-negative mutants of hTERT dramatically reduced the level of endogenous telomerase activity in tumor cell lines. Clones with short telomeres continued to divide, then exhibited an increase in abnormal mitoses followed by massive apoptosis leading to the loss of the entire population. This cell death was telomere-length dependent, as cells with long telomeres were viable but exhibited telomere shortening at a rate similar to that of mortal cells. It appears that telomerase inhibition in cells with short telomeres lead to chromosomal damage, which in turn trigger apoptotic cell death. These results provide the first direct evidence that telomerase is required for the maintenance of human tumor and immortal cell viability, and suggest that tumors with short telomeres may be effectively and rapidly killed following telomerase inhibition.
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Affiliation(s)
- X Zhang
- Department of Cancer Biology, Amgen, Thousand Oaks, California 91320 USA
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Harrington L, Zhou W, McPhail T, Oulton R, Yeung DS, Mar V, Bass MB, Robinson MO. Human telomerase contains evolutionarily conserved catalytic and structural subunits. Genes Dev 1997; 11:3109-15. [PMID: 9389643 PMCID: PMC316744 DOI: 10.1101/gad.11.23.3109] [Citation(s) in RCA: 338] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We have cloned and characterized a human gene encoding TP2 (telomerase-associated protein 2), a protein with similarity to reverse transcriptases and the catalytic telomerase subunits from Saccharomyces cerevisiae and Euplotes aediculatus. Indirect immunofluorescence revealed that TP2 was localized to the nucleus. Using antibodies to endogenous and epitope-tagged TP2, we found that TP2 was associated specifically with human telomerase activity and the recently identified telomerase-associated protein TP1. Mutation of conserved residues within the reverse transcriptase domain of TP2 severely reduced associated telomerase activity. These results suggest that telomerase is an evolutionarily conserved multisubunit complex composed of both structural and catalytic subunits.
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Affiliation(s)
- L Harrington
- Amgen Institute/Ontario Cancer Institute, Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 2C1, Canada.
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Perkins CP, Mar V, Shutter JR, del Castillo J, Danilenko DM, Medlock ES, Ponting IL, Graham M, Stark KL, Zuo Y, Cunningham JM, Bosselman RA. Anemia and perinatal death result from loss of the murine ecotropic retrovirus receptor mCAT-1. Genes Dev 1997; 11:914-25. [PMID: 9106662 DOI: 10.1101/gad.11.7.914] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The mCAT-1 gene encodes a basic amino acid transporter that also acts as the receptor for murine ecotropic leukemia viruses. Targeted mutagenesis in embryonic stem cells has been used to introduce a germ-line null mutation into this gene. This mutation removes a domain critical for virus binding and inactivates amino acid transport activity. Homozygous mutant pups generated from these cells were approximately 25% smaller than normal littermates, very anemic, and died on the day of birth. Peripheral blood from homozygotes contained 50% fewer red blood cells, reduced hemoglobin levels, and showed a pronounced normoblastosis. Histological analyses of bone marrow, spleen, and liver showed a decrease in both erythroid progenitors and mature red blood cells. Mutant fetal liver cells behaved normally in in vitro hematopoietic colony-forming assays but generated an anemia when transplanted into irradiated C.B.-17 SCID mice. Furthermore, reconstitution of the white cell compartment of SCID mice by mutant fetal liver cells was less complete than that observed with a mixed population of wild-type and heterozygous fetal liver cells. Primary embryo fibroblasts from mutant mice were completely resistant to ecotropic retrovirus infection. Thus, mCAT-1 not only appears to be the sole receptor for a group of murine ecotropic retroviruses associated with hematological disease but also plays a critical role in both hematopoiesis and growth control during mouse development.
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Affiliation(s)
- C P Perkins
- Department of Molecular Genetics, Amgen, Inc., Thousand Oaks, California 91320, USA.
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Abstract
The telomerase ribonucleoprotein catalyzes the addition of new telomeres onto chromosome ends. A gene encoding a mammalian telomerase homolog called TP1 (telomerase-associated protein 1) was identified and cloned. TP1 exhibited extensive amino acid similarity to the Tetrahymena telomerase protein p80 and was shown to interact specifically with mammalian telomerase RNA. Antiserum to TP1 immunoprecipitated telomerase activity from cell extracts, suggesting that TP1 is associated with telomerase in vivo. The identification of TP1 suggests that telomerase-associated proteins are conserved from ciliates to humans.
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Affiliation(s)
- L Harrington
- Arruda, Ontario Cancer Institute-Amgen Institute, Department of Medical Biophysics, University of Toronto, 620 University Avenue, Toronto, Ontario M5G 2C1, Canada
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Chang MS, McNinch J, Basu R, Shutter J, Hsu RY, Perkins C, Mar V, Suggs S, Welcher A, Li L. Cloning and characterization of the human megakaryocyte growth and development factor (MGDF) gene. J Biol Chem 1995; 270:511-4. [PMID: 7822271 DOI: 10.1074/jbc.270.2.511] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The megakaryocyte growth and development factor (MGDF) is a cytokine that regulates megakaryocyte development and is a ligand for the MPL receptor. In this study, we describe the genomic structure of the human MGDF gene. The MGDF gene was found to consist of seven exons and six introns spanning 8 kilobases. The protein is encoded by exons 3 through 7. The human MGDF gene has been mapped to chromosome 3q26.3. In addition to the previously described full-length cDNA, two cDNA variants were isolated from human fetal liver. Comparison of these two cDNA sequences with the genomic sequence indicates that they arise by differential splicing.
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Affiliation(s)
- M S Chang
- Department of Developmental Biology, Amgen Inc., Thousand Oaks, California 91320
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Abstract
Pertussis toxin binds target cells through the carbohydrate recognition properties of two subunits, S2 and S3, which share amino acid sequence similarity with the lectin domains of the eukaryotic selectin family. Selectins appear on inflamed endothelial cells and promote rolling of leukocytes by reversibly binding carbohydrates. S2, S3, and synthetic peptides representing their carbohydrate recognition domains competitively inhibited adherence of neutrophils to selectin-coated surfaces and to endothelial cells in vitro. These proteins and peptides also rapidly upregulated the function of the leukocyte integrin CD11b/CD18. These findings implicate mimicry of eukaryotic selectins by prokaryotic adhesive ligands and link the mechanisms underlying leukocyte trafficking to microbial pathogenesis.
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Affiliation(s)
- E Rozdzinski
- Laboratory of Molecular Infectious Diseases, Rockefeller University, New York, New York 10021
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