Details of the Drug Combination

General Information of Drug Combination (ID: DC22L67)

• Drug Combination Name: Letrozole + Bendamustine hydrochloride
• Indication: Melanoma; Status: Investigative [1]
• Component Drugs:
  Letrozole (DMH07Y3): Small molecular drug
  Bendamustine hydrochloride (DMFH15Z): Small molecular drug
• High-throughput Screening Result:
  Testing Cell Line: UACC-257
  Zero Interaction Potency (ZIP) Score: 2.55
  Bliss Independence Score: 7.7
  Loewe Additivity Score: 6.55
  LHighest Single Agent (HSA) Score: 6.51

Molecular Interaction Atlas of This Drug Combination

Indication(s) of Letrozole

Disease Entry	ICD 11	Status	REF
Estrogen-receptor positive breast cancer	N.A.	Approved	[2]
Hormonally-responsive breast cancer	2C60-2C65	Approved	[3]

Letrozole Interacts with 1 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Aromatase (CYP19A1)	TTSZLWK	CP19A_HUMAN	Inhibitor	[5]

Letrozole Interacts with 3 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	DE4LYSA	CP3A4_HUMAN	Metabolism	[6]
Aromatase (CYP19A1)	DEQX145	CP19A_HUMAN	Metabolism	[7]
Cytochrome P450 2A6 (CYP2A6)	DEJVYAZ	CP2A6_HUMAN	Metabolism	[8]

Letrozole Interacts with 18 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Aromatase (CYP19A1)	OTZ6XF74	CP19A_HUMAN	Decreases Activity	[9]
Cytochrome P450 3A4 (CYP3A4)	OTQGYY83	CP3A4_HUMAN	Increases Oxidation	[10]
Cytochrome P450 2A6 (CYP2A6)	OT52TWG3	CP2A6_HUMAN	Increases Oxidation	[10]
Adenylate kinase isoenzyme 1 (AK1)	OT614AR3	KAD1_HUMAN	Increases ADR	[11]
Dickkopf-related protein 1 (DKK1)	OTRDLUSP	DKK1_HUMAN	Increases Expression	[12]
Follitropin subunit beta (FSHB)	OTGLS283	FSHB_HUMAN	Increases Expression	[13]
Lutropin subunit beta (LHB)	OT5GBOVJ	LSHB_HUMAN	Increases Expression	[13]
Progesterone receptor (PGR)	OT0FZ3QE	PRGR_HUMAN	Decreases Expression	[14]
Leukemia inhibitory factor (LIF)	OTO46S5S	LIF_HUMAN	Increases Expression	[12]
Gap junction alpha-1 protein (GJA1)	OTT94MKL	CXA1_HUMAN	Decreases Expression	[15]
G1/S-specific cyclin-D1 (CCND1)	OT8HPTKJ	CCND1_HUMAN	Decreases Expression	[16]
G1/S-specific cyclin-D2 (CCND2)	OTDULQF9	CCND2_HUMAN	Decreases Expression	[16]
Cyclin-dependent kinase inhibitor 1 (CDKN1A)	OTQWHCZE	CDN1A_HUMAN	Increases Expression	[17]
Leukemia inhibitory factor receptor (LIFR)	OT36W9O5	LIFR_HUMAN	Increases Expression	[12]
Proliferation marker protein Ki-67 (MKI67)	OTA8N1QI	KI67_HUMAN	Decreases Expression	[14]
Small ribosomal subunit protein eS6 (RPS6)	OTT4D1LN	RS6_HUMAN	Decreases Phosphorylation	[16]
Lanosterol 14-alpha demethylase (CYP51A1)	OTAYHG9C	CP51A_HUMAN	Decreases Activity	[18]
Fibroblast growth factor 22 (FGF22)	OTVIX6J0	FGF22_HUMAN	Increases Expression	[12]

Indication(s) of Bendamustine hydrochloride

Disease Entry	ICD 11	Status	REF
leukaemia	2A60-2B33	Approved	[4]

Bendamustine hydrochloride Interacts with 1 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Human Deoxyribonucleic acid (hDNA)	TTUTN1I	NOUNIPROTAC	Modulator	[4]

Bendamustine hydrochloride Interacts with 1 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 1A2 (CYP1A2)	DEJGDUW	CP1A2_HUMAN	Metabolism	[20]

Bendamustine hydrochloride Interacts with 13 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Cellular tumor antigen p53 (TP53)	OTIE1VH3	P53_HUMAN	Increases Expression	[19]
Poly polymerase 1 (PARP1)	OT310QSG	PARP1_HUMAN	Increases Cleavage	[19]
Beta-galactosidase (GLB1)	OTB0TKAG	BGAL_HUMAN	Increases Expression	[21]
Caspase-3 (CASP3)	OTIJRBE7	CASP3_HUMAN	Increases Activity	[19]
Caspase-7 (CASP7)	OTAPJ040	CASP7_HUMAN	Increases Activity	[19]
Caspase-9 (CASP9)	OTD4RFFG	CASP9_HUMAN	Increases Activity	[19]
Caspase-6 (CASP6)	OTXLD3EC	CASP6_HUMAN	Increases Activity	[19]
Baculoviral IAP repeat-containing protein 3 (BIRC3)	OT3E95KB	BIRC3_HUMAN	Decreases Expression	[19]
Baculoviral IAP repeat-containing protein 2 (BIRC2)	OTFXFREP	BIRC2_HUMAN	Decreases Expression	[22]
Caspase-8 (CASP8)	OTA8TVI8	CASP8_HUMAN	Increases Activity	[19]
PRKC apoptosis WT1 regulator protein (PAWR)	OTKY7W52	PAWR_HUMAN	Decreases Expression	[19]
Diablo IAP-binding mitochondrial protein (DIABLO)	OTHJ9MCZ	DBLOH_HUMAN	Increases Localization	[19]
Death domain-associated protein 6 (DAXX)	OTX6O7PL	DAXX_HUMAN	Decreases Expression	[19]

Test Results of This Drug Combination in Other Disease Systems

Indication	DrugCom ID	Cell Line	Status	REF
Adenocarcinoma	DCEN74V	HCT-15	Investigative	[1]
Malignant melanoma	DC36CTJ	UACC62	Investigative	[1]
Melanoma	DC2D5K9	SK-MEL-2	Investigative	[1]
Mixed endometrioid and clear cell carcinoma	DC1BE6T	IGROV1	Investigative	[1]
Renal cell carcinoma	DCRBETP	SN12C	Investigative	[1]
Carcinoma	DCFGD57	RXF 393	Investigative	[23]
Invasive ductal carcinoma	DCSCGV8	HS 578T	Investigative	[23]

References

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• [2] Letrozole FDA Label
• [3] 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: 5209).
• [4] 2008 FDA drug approvals. Nat Rev Drug Discov. 2009 Feb;8(2):93-6.
• [5] Aromatase inhibitors--theoretical concept and present experiences in the treatment of endometriosis. Zentralbl Gynakol. 2003 Jul-Aug;125(7-8):247-51.
• [6] Inhibition of drug metabolizing cytochrome P450s by the aromatase inhibitor drug letrozole and its major oxidative metabolite 4,4'-methanol-bisbenzonitrile in vitro. Cancer Chemother Pharmacol. 2009 Oct;64(5):867-75.
• [7] Double-blind, randomised, multicentre endocrine trial comparing two letrozole doses, in postmenopausal breast cancer patients. Eur J Cancer. 1999 Feb;35(2):208-13.
• [8] Letrozole concentration is associated with CYP2A6 variation but not with arthralgia in patients with breast cancer. Breast Cancer Res Treat. 2018 Nov;172(2):371-379.
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• [12] Clomiphene citrate versus letrozole: molecular analysis of the endometrium in women with polycystic ovary syndrome. Fertil Steril. 2011 Oct;96(4):1051-6. doi: 10.1016/j.fertnstert.2011.07.1092.
• [13] Aromatase inhibition, testosterone, and seizures. Epilepsy Behav. 2004 Apr;5(2):260-3. doi: 10.1016/j.yebeh.2003.12.001.
• [14] Aromatase inhibitors: cellular and molecular effects. J Steroid Biochem Mol Biol. 2005 May;95(1-5):83-9. doi: 10.1016/j.jsbmb.2005.04.010.
• [15] Inhibition of estrogen receptor reduces connexin 43 expression in breast cancers. Toxicol Appl Pharmacol. 2018 Jan 1;338:182-190. doi: 10.1016/j.taap.2017.11.020. Epub 2017 Nov 24.
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• [17] Synergistic activity of letrozole and sorafenib on breast cancer cells. Breast Cancer Res Treat. 2010 Nov;124(1):79-88. doi: 10.1007/s10549-009-0714-5. Epub 2010 Jan 7.
• [18] Comparison of lanosterol-14 alpha-demethylase (CYP51) of human and Candida albicans for inhibition by different antifungal azoles. Toxicology. 2006 Nov 10;228(1):24-32. doi: 10.1016/j.tox.2006.08.007. Epub 2006 Aug 12.
• [19] Synergistic effects of chemotherapeutic drugs in lymphoma cells are associated with down-regulation of inhibitor of apoptosis proteins (IAPs), prostate-apoptosis-response-gene 4 (Par-4), death-associated protein (Daxx) and with enforced caspase activation. Biochem Pharmacol. 2003 Sep 1;66(5):711-24. doi: 10.1016/s0006-2952(03)00410-6.
• [20] Pharmacokinetic and pharmacodynamic profile of bendamustine and its metabolites. Cancer Chemother Pharmacol. 2015 Jun;75(6):1143-54.
• [21] Chronic senescent human mesenchymal stem cells as possible contributor to the wound healing disorder after exposure to the alkylating agent sulfur mustard. Arch Toxicol. 2021 Feb;95(2):727-747. doi: 10.1007/s00204-020-02946-5. Epub 2021 Jan 25.
• [22] Upon drug-induced apoptosis in lymphoma cells X-linked inhibitor of apoptosis (XIAP) translocates from the cytosol to the nucleus. Leuk Lymphoma. 2004 Jul;45(7):1429-36. doi: 10.1080/1042819042000198858.
• [23] Biologically active neutrophil chemokine pattern in tonsillitis.Clin Exp Immunol. 2004 Mar;135(3):511-8. doi: 10.1111/j.1365-2249.2003.02390.x.