Details of the Drug Combination

General Information of Drug Combination (ID: DCPMOSD)

• Drug Combination Name: Mefloquine + Tamoxifen
• Indication: Primitive neuroectodermal tumor; Status: Investigative [1]
• Component Drugs:
  Mefloquine (DMWT905): Small molecular drug
  Tamoxifen (DMLB0EZ): Small molecular drug
• High-throughput Screening Result:
  Testing Cell Line: TC-32
  Zero Interaction Potency (ZIP) Score: 23.19
  Bliss Independence Score: 25.54
  Loewe Additivity Score: 2.31
  LHighest Single Agent (HSA) Score: 2.9

Molecular Interaction Atlas of This Drug Combination

Indication(s) of Mefloquine

Disease Entry	ICD 11	Status	REF
Malaria	1F40-1F45	Approved	[2]
Coronavirus Disease 2019 (COVID-19)	1D6Y	Phase 2	[3]
Middle East Respiratory Syndrome (MERS)	1D64	Preclinical	[4]
Severe acute respiratory syndrome (SARS)	1D65	Preclinical	[4]
Progressive multifocal leukoencephalopathy	8A45.02	Investigative	[5]

Mefloquine Interacts with 1 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Plasmodium 80S ribosome (Malaria 80S)	TTT28H3	NOUNIPROTAC	Binder	[8]

Mefloquine Interacts with 1 DTP Molecule(s)

DTP Name	DTP ID	UniProt ID	Mode of Action	REF
P-glycoprotein 1 (ABCB1)	DTUGYRD	MDR1_HUMAN	Substrate	[9]

Mefloquine Interacts with 1 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	DE4LYSA	CP3A4_HUMAN	Metabolism	[10]

Indication(s) of Tamoxifen

Disease Entry	ICD 11	Status	REF
Breast cancer	2C60-2C65	Approved	[6]
Inflammatory breast cancer	2C62	Approved	[7]
Invasive ductal breast carcinoma	N.A.	Approved	[7]

Tamoxifen Interacts with 1 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Estrogen receptor (ESR)	TTZAYWL	ESR1_HUMAN	Antagonist	[11]

Tamoxifen Interacts with 3 DTP Molecule(s)

DTP Name	DTP ID	UniProt ID	Mode of Action	REF
P-glycoprotein 1 (ABCB1)	DTUGYRD	MDR1_HUMAN	Substrate	[12]
Breast cancer resistance protein (ABCG2)	DTI7UX6	ABCG2_HUMAN	Substrate	[13]
Multidrug resistance-associated protein 7 (ABCC10)	DTPS120	MRP7_HUMAN	Substrate	[14]

Tamoxifen Interacts with 16 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	DE4LYSA	CP3A4_HUMAN	Metabolism	[15]
Cytochrome P450 1A2 (CYP1A2)	DEJGDUW	CP1A2_HUMAN	Metabolism	[16]
UDP-glucuronosyltransferase 1A1 (UGT1A1)	DEYGVN4	UD11_HUMAN	Metabolism	[17]
Cytochrome P450 2A6 (CYP2A6)	DEJVYAZ	CP2A6_HUMAN	Metabolism	[18]
Cytochrome P450 1A1 (CYP1A1)	DE6OQ3W	CP1A1_HUMAN	Metabolism	[19]
Sulfotransferase 1A1 (SULT1A1)	DEYWLRK	ST1A1_HUMAN	Metabolism	[20]
Cytochrome P450 2D6 (CYP2D6)	DECB0K3	CP2D6_HUMAN	Metabolism	[21]
Cytochrome P450 3A5 (CYP3A5)	DEIBDNY	CP3A5_HUMAN	Metabolism	[22]
Cytochrome P450 2E1 (CYP2E1)	DEVDYN7	CP2E1_HUMAN	Metabolism	[18]
Thiopurine methyltransferase (TPMT)	DEFQ8VO	TPMT_HUMAN	Metabolism	[23]
Cytochrome P450 3A7 (CYP3A7)	DERD86B	CP3A7_HUMAN	Metabolism	[24]
Cytochrome P450 2C9 (CYP2C9)	DE5IED8	CP2C9_HUMAN	Metabolism	[25]
Cytochrome P450 2B6 (CYP2B6)	DEPKLMQ	CP2B6_HUMAN	Metabolism	[26]
Mephenytoin 4-hydroxylase (CYP2C19)	DEGTFWK	CP2CJ_HUMAN	Metabolism	[27]
UDP-glucuronosyltransferase 2B7 (UGT2B7)	DEB3CV1	UD2B7_HUMAN	Metabolism	[28]
UDP-glucuronosyltransferase 1A10 (UGT1A10)	DEL5N6Y	UD110_HUMAN	Metabolism	[29]

Tamoxifen Interacts with 1 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Coagulation factor V (F5)	OTDMZ3LT	FA5_HUMAN	Increases ADR	[30]

Test Results of This Drug Combination in Other Disease Systems

Indication	DrugCom ID	Cell Line	Status	REF
Diffuse intrinsic pontine glioma	DCM84H1	SU-DIPG-XIII	Investigative	[1]

References

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• [2] FDA Approved Drug Products from FDA Official Website. 2019. Application Number: (NDA) 019578
• [3] ClinicalTrials.gov (NCT04347031) An Open Randomized Study of the Effectiveness of Mefloquine for the Treatment of Patients With COVID19. U.S. National Institutes of Health.
• [4] Repurposing of clinically developed drugs for treatment of Middle East respiratory syndrome coronavirus infection. Antimicrob Agents Chemother. 2014 Aug;58(8):4885-93.
• [5] Mefloquine FDA Label
• [6] URL: http://www.guidetopharmacology.org Nucleic Acids Res. 2015 Oct 12. pii: gkv1037. The IUPHAR/BPS Guide to PHARMACOLOGY in 2016: towards curated quantitative interactions between 1300 protein targets and 6000 ligands. (Ligand id: 1016).
• [7] Tamoxifen FDA Label
• [8] An ultrastructural study of the effects of mefloquine on malaria parasites. Am J Trop Med Hyg. 1987 Jan;36(1):9-14.
• [9] Polymorphisms in human MDR1 (P-glycoprotein): recent advances and clinical relevance. Clin Pharmacol Ther. 2004 Jan;75(1):13-33.
• [10] Effect of rifampin on plasma concentrations of mefloquine in healthy volunteers. J Pharm Pharmacol. 2000 Oct;52(10):1265-9.
• [11] Modulators of vascular sex hormone receptors and their effects in estrogen-deficiency states associated with menopause. Recent Pat Cardiovasc Drug Discov. 2008 Nov;3(3):165-86.
• [12] Mammalian drug efflux transporters of the ATP binding cassette (ABC) family in multidrug resistance: A review of the past decade. Cancer Lett. 2016 Jan 1;370(1):153-64.
• [13] The phytoestrogen genistein enhances multidrug resistance in breast cancer cell lines by translational regulation of ABC transporters. Cancer Lett. 2016 Jun 28;376(1):165-72.
• [14] Modulation of the ATPase and transport activities of broad-acting multidrug resistance factor ABCC10 (MRP7). Cancer Res. 2012 Dec 15;72(24):6457-67.
• [15] Comprehensive evaluation of tamoxifen sequential biotransformation by the human cytochrome P450 system in vitro: prominent roles for CYP3A and CYP2D6. J Pharmacol Exp Ther. 2004 Sep;310(3):1062-75.
• [16] Endoxifen and other metabolites of tamoxifen inhibit human hydroxysteroid sulfotransferase 2A1 (hSULT2A1). Drug Metab Dispos. 2014 Nov;42(11):1843-50.
• [17] Functional significance of UDP-glucuronosyltransferase variants in the metabolism of active tamoxifen metabolites. Cancer Res. 2009 Mar 1;69(5):1892-900.
• [18] Genotoxicity of tamoxifen, tamoxifen epoxide and toremifene in human lymphoblastoid cells containing human cytochrome P450s. Carcinogenesis. 1994 Jan;15(1):5-9.
• [19] Metabolism of tamoxifen by recombinant human cytochrome P450 enzymes: formation of the 4-hydroxy, 4'-hydroxy and N-desmethyl metabolites and isomerization of trans-4-hydroxytamoxifen. Drug Metab Dispos. 2002 Aug;30(8):869-74.
• [20] Tamoxifen-induced adduct formation and cell stress in human endometrial glands. Drug Metab Dispos. 2010 Jan;38(1):200-7.
• [21] CYP2D6 polymorphisms and tamoxifen metabolism: clinical relevance. Curr Oncol Rep. 2010 Jan;12(1):7-15.
• [22] Polymorphisms in cytochrome P4503A5 (CYP3A5) may be associated with race and tumor characteristics, but not metabolism and side effects of tamoxifen in breast cancer patients. Cancer Lett. 2005 Jan 10;217(1):61-72.
• [23] Polymorphism of estrogen metabolism genes and cataract. Med Hypotheses. 2004;63(3):494-7.
• [24] Drug Interactions Flockhart Table
• [25] Tamoxifen inhibits cytochrome P450 2C9 activity in breast cancer patients. J Chemother. 2006 Aug;18(4):421-4.
• [26] Effect of tamoxifen on the enzymatic activity of human cytochrome CYP2B6. J Pharmacol Exp Ther. 2002 Jun;301(3):945-52.
• [27] Cytochrome P450 pharmacogenetics and cancer. Oncogene. 2006 Mar 13;25(11):1679-91.
• [28] Metabolism and transport of tamoxifen in relation to its effectiveness: new perspectives on an ongoing controversy. Future Oncol. 2014 Jan;10(1):107-22.
• [29] Glucuronidation of active tamoxifen metabolites by the human UDP glucuronosyltransferases. Drug Metab Dispos. 2007 Nov;35(11):2006-14.
• [30] Factor V Leiden mutation and thromboembolism risk in women receiving adjuvant tamoxifen for breast cancer. J Natl Cancer Inst. 2010 Jul 7;102(13):942-9. doi: 10.1093/jnci/djq211. Epub 2010 Jun 16.