V-myc avian myelocytomatosis viral oncogene homolog |
Structure of the c-Myc (red) in complex with Max (blue) and DNA (PDB 1nkp). Both proteins are binding the major groove of the DNA by forming a fork-like structure.
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Available structures |
PDB |
Ortholog search: PDBe, RCSB |
List of PDB id codes |
1A93, 1EE4, 1MV0, 1NKP, 2A93, 2OR9
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Identifiers |
Symbols |
MYC ; MRTL; MYCC; bHLHe39; c-Myc |
External IDs |
OMIM: 190080 MGI: 97250 HomoloGene: 31092 ChEMBL: 1250348 GeneCards: MYC Gene |
Gene ontology |
Molecular function |
• RNA polymerase II core promoter proximal region sequence-specific DNA binding
• RNA polymerase II core promoter proximal region sequence-specific DNA binding transcription factor activity involved in positive regulation of transcription
• DNA binding
• sequence-specific DNA binding transcription factor activity
• protein binding
• transcription factor binding
• protein complex binding
• protein dimerization activity
• repressing transcription factor binding
• E-box binding
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Cellular component |
• nucleus
• nucleoplasm
• nucleolus
• cytosol
• protein complex
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Biological process |
• negative regulation of transcription from RNA polymerase II promoter
• MAPK cascade
• branching involved in ureteric bud morphogenesis
• positive regulation of mesenchymal cell proliferation
• energy reserve metabolic process
• chromatin remodeling
• transcription, DNA-templated
• transcription initiation from RNA polymerase II promoter
• cellular iron ion homeostasis
• cellular response to DNA damage stimulus
• cell cycle arrest
• transforming growth factor beta receptor signaling pathway
• Notch signaling pathway
• positive regulation of cell proliferation
• response to gamma radiation
• gene expression
• regulation of gene expression
• oxygen transport
• regulation of telomere maintenance
• negative regulation of stress-activated MAPK cascade
• cellular response to UV
• cellular response to drug
• response to drug
• negative regulation of apoptotic process
• positive regulation of cysteine-type endopeptidase activity involved in apoptotic process
• fibroblast apoptotic process
• negative regulation of monocyte differentiation
• positive regulation of transcription, DNA-templated
• positive regulation of transcription from RNA polymerase II promoter
• positive regulation of fibroblast proliferation
• negative regulation of fibroblast proliferation
• positive regulation of epithelial cell proliferation
• chromosome organization
• negative regulation of cell division
• canonical Wnt signaling pathway
• response to growth factor
• positive regulation of metanephric cap mesenchymal cell proliferation
• positive regulation of DNA biosynthetic process
• positive regulation of response to DNA damage stimulus
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Sources: Amigo / QuickGO |
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Orthologs |
Species |
Human |
Mouse |
Entrez |
4609 |
17869 |
Ensembl |
ENSG00000136997 |
ENSMUSG00000022346 |
UniProt |
P01106 |
P01108 |
RefSeq (mRNA) |
NM_002467 |
NM_001177352 |
RefSeq (protein) |
NP_002458 |
NP_001170823 |
Location (UCSC) |
Chr 8:
127.74 – 127.74 Mb |
Chr 15:
61.99 – 61.99 Mb |
PubMed search |
[1] |
[2] |
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Myc (c-Myc) is a regulator gene that codes for a transcription factor. The protein encoded by this gene is a multifunctional, nuclear phosphoprotein that plays a role in cell cycle progression, apoptosis and cellular transformation.[1]
A mutated version of Myc is found in many cancers, which causes Myc to be constitutively (persistently) expressed. This leads to the unregulated expression of many genes, some of which are involved in cell proliferation, and results in the formation of cancer.[1] A common human translocation involving Myc is critical to the development of most cases of Burkitt Lymphoma.[2] Malfunctions in Myc have also been found in carcinoma of the cervix, colon, breast, lung and stomach.[1] Myc is thus viewed as a promising target for anti-cancer drugs.[3]
In the human genome, Myc is located on chromosome 8 and is believed to regulate expression of 15% of all genes[4] through binding on Enhancer Box sequences (E-boxes) and recruiting histone acetyltransferases (HATs). This means that in addition to its role as a classical transcription factor, Myc also functions to regulate global chromatin structure by regulating histone acetylation both in gene-rich regions and at sites far from any known gene.[5]
Contents
- 1 Discovery
- 2 Structure
- 3 Function
- 4 Myc-nick
- 5 Clinical significance
- 6 Animal Models
- 7 Interactions
- 8 See also
- 9 References
- 10 Further reading
- 11 External links
Discovery
Myc gene was first discovered in Burkitt lymphoma patients. In Burkitt lymphoma, cancer cells show chromosomal translocations, in which Chromosome 8 is frequently involved. Cloning the break-point of the fusion chromosomes revealed a gene that was similar to myelocytomatosis viral oncogene (v-Myc). Thus, the newfound cellular gene was named c-Myc.
Structure
Myc protein belongs to Myc family of transcription factors, which also includes N-Myc and L-Myc genes. Myc family of transcription factors contain bHLH/LZ (basic Helix-Loop-Helix Leucine Zipper) domain. Myc protein, through its bHLH structural motif can bind to DNA, while the leucine zipper domain allows the dimerization with its partner Max, another bHLH transcription factor.
Myc mRNA contains an IRES (internal ribosome entry site) that allows the RNA to be translated into protein when 5' cap-dependent translation is inhibited, such as during viral infection.
Function
Myc protein is a transcription factor that activates expression of many genes through binding enhancer box sequences (E-boxes) and recruiting histone acetyltransferases (HATs). It can also act as a transcriptional repressor. By binding Miz-1 transcription factor and displacing the p300 co-activator, it inhibits expression of Miz-1 target genes. In addition, myc has a direct role in the control of DNA replication.[6]
Myc is activated upon various mitogenic signals such as Wnt, Shh and EGF (via the MAPK/ERK pathway). By modifying the expression of its target genes, Myc activation results in numerous biological effects. The first to be discovered was its capability to drive cell proliferation (upregulates cyclins, downregulates p21), but it also plays a very important role in regulating cell growth (upregulates ribosomal RNA and proteins), apoptosis (downregulates Bcl-2), differentiation, and stem cell self-renewal. Myc is a very strong proto-oncogene and it is very often found to be upregulated in many types of cancers. Myc overexpression stimulates gene amplification,[7] presumably through DNA over-replication.
There have been several studies that have clearly indicated Myc's role in cell competition.[8]
A major effect of Myc is B cell proliferation.[9]
c-Myc induces AEG-1 or MTDH gene expression and in turn itself requires AEG-1 oncogene for its expression.
Myc-nick
Myc-nick is a cytoplasmic form of Myc produced by a partial proteolytic cleavage of full-length c-Myc and N-Myc.[10] Myc cleavage is mediated by the calpain family of calcium-dependent cytosolic proteases.
The cleavage of Myc by calpains is a constitutive process but is enhanced under conditions that require rapid downregulation of Myc levels, such as during terminal differentiation. Upon cleavage, the C-terminus of Myc (containing the DNA binding domain) is degraded, while Myc-nick, the N-terminal segment 298-residue segment remains in the cytoplasm. Myc-nick contains binding domains for histone acetyltransferases and for ubiquitin ligases.
The functions of Myc-nick are currently under investigation, but this new Myc family member was found to regulate cell morphology, at least in part, by interacting with acetyl transferases to promote the acetylation of α-tubulin. Ectopic expression of Myc-nick accelerates the differentiation of committed myoblasts into muscle cells.
Clinical significance
Except for early response genes, Myc universally upregulates gene expression. Furthermore the upregulation is nonlinear. Genes whose expression is already significantly upregulated in the absence of Myc are strongly boosted in the presence of Myc, whereas genes whose expression is low in the absence Myc get only a small boost when Myc is present.[11]
Inactivation of SUMO-activating enzyme (SAE1 / SAE2) in the presence of Myc hyperactivation results in mitotic catastrophe and cell death in cancer cells. Hence inhibitors of SUMOylation may be a possible treatment for cancer.[12]
Amplification of the MYC gene was found in a significant number of epithelial ovarian cancer cases.[13] In TCGA datasets, the amplification of Myc occurs in several cancer types, including breast, colorectal, pancreatic, gastric, and uterine cancers.[14]
In the experimental transformation process of normal cells into cancer cells, the MYC gene can cooperate with the RAS gene.[15][16]
Expression of Myc is highly dependent on BRD4 function in some cancers.[17][18] BET inhibitors have been used to successfully block Myc function in pre-clinical cancer models and are currently being evaluated in clinical trials.[19][20]
Animal Models
During the discovery of Myc gene, it was realized that chromosomes that reciprocally translocate to Chromosome 8 contained immunoglobulin genes at the break-point. Enhancers that normally drive expression of immunoglobin genes now lead to overexpression of Myc proto-oncogene in lymphoma cells. To study the mechanism of tumorigenesis in Burkitt lymphoma by mimicking expression pattern of Myc in these cancer cells, transgenic mouse models were developed. Myc gene placed under the control of IgM heavy chain enhancer in transgenic mice gives rise to mainly lymphomas. Later on, in order to study effects of Myc in other types of cancer, transgenic mice that overexpress Myc in different tissues (liver, breast) were also made. In all these mouse models overexpression of Myc causes tumorigenesis, illustrating the potency of Myc oncogene.
Interactions
Myc has been shown to interact with:
- ACTL6A[21]
- BRCA1[22][23][24][25]
- Bcl-2[26]
- Cyclin T1[27]
- CHD8.[28]
- DNMT3A[29]
- EP400[30]
- GTF2I[31]
- HTATIP[32]
- let-7[33][34][35]
- MAPK1[26][36][37]
- MAPK8[38]
- MAX[39][40][41][42][43][44][45][46][47][48][49][50][51]
- MLH1[43]
- MYCBP2[52]
- MYCBP[53]
- NMI[22]
- NFYB[54]
- NFYC[55]
- P73[56]
- PCAF[57]
- PFDN5[58][59]
- RuvB-like 1[21][30]
- SAP130[57]
- SMAD2[60]
- SMAD3[60]
- SMARCA4[21][39]
- SMARCB1[42]
- SUPT3H[57]
- TIAM1[61]
- TADA2L[57]
- TAF9[57]
- TFAP2A[62]
- TRRAP[21][40][41][57]
- WDR5[63]
- YY1[64] and
- ZBTB17.[65][66]
Overview of signal transduction pathways involved in apoptosis.
See also
Myc-tag
References
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- ^ Uramoto H, Izumi H, Ise T, Tada M, Uchiumi T, Kuwano M, Yasumoto K, Funa K, Kohno K (2002). "p73 Interacts with c-Myc to regulate Y-box-binding protein-1 expression". J. Biol. Chem. 277 (35): 31694–702. doi:10.1074/jbc.M200266200. PMID 12080043.
- ^ a b c d e f Liu X, Tesfai J, Evrard YA, Dent SY, Martinez E (2003). "c-Myc transformation domain recruits the human STAGA complex and requires TRRAP and GCN5 acetylase activity for transcription activation". J. Biol. Chem. 278 (22): 20405–12. doi:10.1074/jbc.M211795200. PMC 4031917. PMID 12660246.
- ^ Mori K, Maeda Y, Kitaura H, Taira T, Iguchi-Ariga SM, Ariga H (1998). "MM-1, a novel c-Myc-associating protein that represses transcriptional activity of c-Myc". J. Biol. Chem. 273 (45): 29794–800. doi:10.1074/jbc.273.45.29794. PMID 9792694.
- ^ Fujioka Y, Taira T, Maeda Y, Tanaka S, Nishihara H, Iguchi-Ariga SM, Nagashima K, Ariga H (2001). "MM-1, a c-Myc-binding protein, is a candidate for a tumor suppressor in leukemia/lymphoma and tongue cancer". J. Biol. Chem. 276 (48): 45137–44. doi:10.1074/jbc.M106127200. PMID 11567024.
- ^ a b Feng XH, Liang YY, Liang M, Zhai W, Lin X (2002). "Direct interaction of c-Myc with Smad2 and Smad3 to inhibit TGF-beta-mediated induction of the CDK inhibitor p15(Ink4B)". Mol. Cell 9 (1): 133–43. doi:10.1016/s1097-2765(01)00430-0. PMID 11804592.
- ^ Otsuki Y, Tanaka M, Kamo T, Kitanaka C, Kuchino Y, Sugimura H (2003). "Guanine nucleotide exchange factor, Tiam1, directly binds to c-Myc and interferes with c-Myc-mediated apoptosis in rat-1 fibroblasts". J. Biol. Chem. 278 (7): 5132–40. doi:10.1074/jbc.M206733200. PMID 12446731.
- ^ Gaubatz S, Imhof A, Dosch R, Werner O, Mitchell P, Buettner R, Eilers M (1995). "Transcriptional activation by Myc is under negative control by the transcription factor AP-2". EMBO J. 14 (7): 1508–19. PMC 398238. PMID 7729426.
- ^ Thomas LR, Wang Q, Grieb BC, Phan J, Foshage AM, Sun Q, Olejniczak ET, Clark T, Dey S, Lorey S, Alicie B, Howard GC, Cawthon B, Ess KC, Eischen CM, Zhao Z, Fesik SW, Tansey WP (Mar 2015). "Interaction with WDR5 Promotes Target Gene Recognition and Tumorigenesis by MYC". Molecular Cell 58 (3): 1–13. doi:10.1016/j.molcel.2015.02.028. PMC 4427524. PMID 25818646.
- ^ Shrivastava A, Saleque S, Kalpana GV, Artandi S, Goff SP, Calame K (1993). "Inhibition of transcriptional regulator Yin-Yang-1 by association with c-Myc". Science 262 (5141): 1889–92. doi:10.1126/science.8266081. PMID 8266081.
- ^ Staller P, Peukert K, Kiermaier A, Seoane J, Lukas J, Karsunky H, Möröy T, Bartek J, Massagué J, Hänel F, Eilers M (2001). "Repression of p15INK4b expression by Myc through association with Miz-1". Nat. Cell Biol. 3 (4): 392–9. doi:10.1038/35070076. PMID 11283613.
- ^ Peukert K, Staller P, Schneider A, Carmichael G, Hänel F, Eilers M (1997). "An alternative pathway for gene regulation by Myc". EMBO J. 16 (18): 5672–86. doi:10.1093/emboj/16.18.5672. PMC 1170199. PMID 9312026.
Further reading
- Ruf IK, Rhyne PW, Yang H, Borza CM, Hutt-Fletcher LM, Cleveland JL, Sample JT (2001). "EBV regulates c-MYC, apoptosis, and tumorigenicity in Burkitt's lymphoma". Curr. Top. Microbiol. Immunol. 258: 153–60. PMID 11443860.
- Lüscher B (2001). "Function and regulation of the transcription factors of the Myc/Max/Mad network". Gene 277 (1–2): 1–14. doi:10.1016/S0378-1119(01)00697-7. PMID 11602341.
- Hoffman B, Amanullah A, Shafarenko M, Liebermann DA (2002). "The proto-oncogene c-myc in hematopoietic development and leukemogenesis". Oncogene 21 (21): 3414–21. doi:10.1038/sj.onc.1205400. PMID 12032779.
- Pelengaris S, Khan M, Evan G (2002). "c-MYC: more than just a matter of life and death". Nat. Rev. Cancer 2 (10): 764–76. doi:10.1038/nrc904. PMID 12360279.
- Nilsson JA, Cleveland JL (2003). "Myc pathways provoking cell suicide and cancer". Oncogene 22 (56): 9007–21. doi:10.1038/sj.onc.1207261. PMID 14663479.
- Dang CV, O'donnell KA, Juopperi T (2005). "The great MYC escape in tumorigenesis". Cancer Cell 8 (3): 177–8. doi:10.1016/j.ccr.2005.08.005. PMID 16169462.
- Dang CV, Li F, Lee LA (2005). "Could MYC induction of mitochondrial biogenesis be linked to ROS production and genomic instability?". Cell Cycle 4 (11): 1465–6. doi:10.4161/cc.4.11.2121. PMID 16205115.
- Coller HA, Forman JJ, Legesse-Miller A (2007). ""Myc'ed messages": myc induces transcription of E2F1 while inhibiting its translation via a microRNA polycistron". PLoS Genet. 3 (8): e146. doi:10.1371/journal.pgen.0030146. PMC 1959363. PMID 17784791.
- Astrin SM, Laurence J (1992). "Human immunodeficiency virus activates c-myc and Epstein-Barr virus in human B lymphocytes". Ann. N. Y. Acad. Sci. 651: 422–32. doi:10.1111/j.1749-6632.1992.tb24642.x. PMID 1318011.
- Bernstein PL, Herrick DJ, Prokipcak RD, Ross J (1992). "Control of c-myc mRNA half-life in vitro by a protein capable of binding to a coding region stability determinant". Genes Dev. 6 (4): 642–54. doi:10.1101/gad.6.4.642. PMID 1559612.
- Iijima S, Teraoka H, Date T, Tsukada K (1992). "DNA-activated protein kinase in Raji Burkitt's lymphoma cells. Phosphorylation of c-Myc oncoprotein". Eur. J. Biochem. 206 (2): 595–603. doi:10.1111/j.1432-1033.1992.tb16964.x. PMID 1597196.
- Seth A, Alvarez E, Gupta S, Davis RJ (1991). "A phosphorylation site located in the NH2-terminal domain of c-Myc increases transactivation of gene expression". J. Biol. Chem. 266 (35): 23521–4. PMID 1748630.
- Takahashi E, Hori T, O'Connell P, Leppert M, White R (1991). "Mapping of the MYC gene to band 8q24.12----q24.13 by R-banding and distal to fra(8)(q24.11), FRA8E, by fluorescence in situ hybridization". Cytogenet. Cell Genet. 57 (2–3): 109–11. doi:10.1159/000133124. PMID 1914517.
- Blackwood EM, Eisenman RN (1991). "Max: a helix-loop-helix zipper protein that forms a sequence-specific DNA-binding complex with Myc". Science 251 (4998): 1211–7. doi:10.1126/science.2006410. PMID 2006410.
- Gazin C, Rigolet M, Briand JP, Van Regenmortel MH, Galibert F (1986). "Immunochemical detection of proteins related to the human c-myc exon 1". EMBO J. 5 (9): 2241–50. PMC 1167107. PMID 2430795.
- Lüscher B, Kuenzel EA, Krebs EG, Eisenman RN (1989). "Myc oncoproteins are phosphorylated by casein kinase II". EMBO J. 8 (4): 1111–9. PMC 400922. PMID 2663470.
- Finver SN, Nishikura K, Finger LR, Haluska FG, Finan J, Nowell PC, Croce CM (1988). "Sequence analysis of the MYC oncogene involved in the t(8;14)(q24;q11) chromosome translocation in a human leukemia T-cell line indicates that putative regulatory regions are not altered". Proc. Natl. Acad. Sci. U.S.A. 85 (9): 3052–6. doi:10.1073/pnas.85.9.3052. PMC 280141. PMID 2834731.
- Showe LC, Moore RC, Erikson J, Croce CM (1987). "MYC oncogene involved in a t(8;22) chromosome translocation is not altered in its putative regulatory regions". Proc. Natl. Acad. Sci. U.S.A. 84 (9): 2824–8. doi:10.1073/pnas.84.9.2824. PMC 304752. PMID 3033665.
- Guilhot S, Petridou B, Syed-Hussain S, Galibert F (1988). "Nucleotide sequence 3' to the human c-myc oncogene; presence of a long inverted repeat". Gene 72 (1–2): 105–8. doi:10.1016/0378-1119(88)90131-X. PMID 3243428.
- Hann SR, King MW, Bentley DL, Anderson CW, Eisenman RN (1988). "A non-AUG translational initiation in c-myc exon 1 generates an N-terminally distinct protein whose synthesis is disrupted in Burkitt's lymphomas". Cell 52 (2): 185–95. doi:10.1016/0092-8674(88)90507-7. PMID 3277717.
External links
- The Myc Protein
- NCBI Human Myc protein
- Myc cancer gene
- myc Proto-Oncogene Proteins at the US National Library of Medicine Medical Subject Headings (MeSH)
- Generating iPS Cells from MEFS through Forced Expression of Sox-2, Oct-4, c-Myc, and Klf4
- Drosophila Myc - The Interactive Fly
- FactorBook C-Myc
PDB gallery
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1nkp: Crystal structure of Myc-Max recognizing DNA
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Neoplasm: Tumor suppressor genes/proteins and Oncogenes/Proto-oncogenes
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Ligand |
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Receptor |
Wnt signaling pathway |
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Hedgehog signaling pathway |
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TGF beta signaling pathway |
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Receptor tyrosine kinase |
- ONCO: ErbB/c-ErbB
- c-Met
- c-Ret
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JAK-STAT signaling pathway |
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Intracellular signaling P+Ps |
Wnt signaling pathway |
- ONCO: Beta-catenin
- TSP: APC
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TGF beta signaling pathway |
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Akt/PKB signaling pathway |
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Hippo signaling pathway |
- TSP: Neurofibromin 2/Merlin
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MAPK/ERK pathway |
- TSP: Neurofibromin 1
- ONCO: c-Ras
- HRAS
- c-Raf
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Other/unknown |
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Nucleus |
Cell cycle |
- TSP: p53
- pRb
- WT1
- p16/p14arf
- ONCO: CDK4
- Cyclin D
- Cyclin E
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DNA repair/Fanconi |
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Ubiquitin ligase |
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Transcription factor |
- TSP: KLF6
- ONCO: AP-1
- c-Myc
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Mitochondrion |
- Apoptosis inhibitor: SDHB
- SDHD
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Other/ungrouped |
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Index of neoplasms and cancer
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Description |
- Tumor suppressing and oncogenes
- Tumor markers
- Carcinogen
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Disease |
- Neoplasms and cancer
- Symptoms and signs
- Paraneoplastic
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Treatment |
- Radiotherapy
- Drugs
- Immunotherapy
- intracellular chemotherapeutics
- extracellular chemotherapeutics
- adjuvant detoxification
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