Details of the Drug Combination

General Information of Drug Combination (ID: DC4DE81)

• Drug Combination Name: Letrozole + Sirolimus
• Indication: Plasma cell myeloma; Status: Investigative [1]
• Component Drugs:
  Letrozole (DMH07Y3): Small molecular drug
  Sirolimus (DMGW1ID): Small molecular drug
• High-throughput Screening Result:
  Testing Cell Line: RPMI-8226
  Zero Interaction Potency (ZIP) Score: 1.42
  Bliss Independence Score: 5.89
  Loewe Additivity Score: 5.04
  LHighest Single Agent (HSA) Score: 3.63

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	[10]

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	[11]
Aromatase (CYP19A1)	DEQX145	CP19A_HUMAN	Metabolism	[12]
Cytochrome P450 2A6 (CYP2A6)	DEJVYAZ	CP2A6_HUMAN	Metabolism	[13]

Letrozole Interacts with 7 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Adenylate kinase isoenzyme 1 (AK1)	OT614AR3	KAD1_HUMAN	Increases ADR	[14]
Follitropin subunit beta (FSHB)	OTGLS283	FSHB_HUMAN	Increases Expression	[15]
Lutropin subunit beta (LHB)	OT5GBOVJ	LSHB_HUMAN	Increases Expression	[15]
G1/S-specific cyclin-D2 (CCND2)	OTDULQF9	CCND2_HUMAN	Decreases Expression	[16]
Cyclin-dependent kinase inhibitor 1 (CDKN1A)	OTQWHCZE	CDN1A_HUMAN	Increases Expression	[17]
Small ribosomal subunit protein eS6 (RPS6)	OTT4D1LN	RS6_HUMAN	Decreases Phosphorylation	[16]
Fibroblast growth factor 22 (FGF22)	OTVIX6J0	FGF22_HUMAN	Increases Expression	[18]

Indication(s) of Sirolimus

Disease Entry	ICD 11	Status	REF
Advanced cancer	2A00-2F9Z	Approved	[4]
Brainstem neoplasm	N.A.	Approved	[4]
Graft-versus-host disease	4B24	Approved	[4]
Intracranial meningioma	N.A.	Approved	[4]
Lung cancer	2C25.0	Approved	[4]
Lung lymphangioleiomyomatosis	N.A.	Approved	[4]
Lymphangioleiomyomatosis	CB07	Approved	[5]
Mucosal melanoma	N.A.	Approved	[4]
Multiple myeloma	2A83	Approved	[6]
Multiple sclerosis	8A40	Approved	[4]
Non-small-cell lung cancer	2C25.Y	Approved	[4]
Organ transplant rejection	NE84	Approved	[7]
Plasma cell myeloma	2A83.1	Approved	[4]
Prostate cancer	2C82.0	Approved	[4]
Salivary gland squamous cell carcinoma	N.A.	Approved	[4]
Uveitis	9A96.Z	Phase 3	[8]
Coronavirus Disease 2019 (COVID-19)	1D6Y	Phase 2	[9]
Dutch elm disease	8D64	Phase 1/2	[7]
Castration-resistant prostate carcinoma	N.A.	Investigative	[4]
Neuroblastoma	2D11.2	Investigative	[4]
Pancreatic acinar cell carcinoma	N.A.	Investigative	[4]
Polycystic kidney disease	GB8Y	Investigative	[4]
Rheumatoid arthritis	FA20	Investigative	[4]

Sirolimus Interacts with 3 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Serine/threonine-protein kinase mTOR (mTOR)	TTCJG29	MTOR_HUMAN	Inhibitor	[19]
PI3K/AKT/mTOR pathway (PAm pathway)	TTGQUFK	NOUNIPROTAC	Inhibitor	[20]
HUMAN mammalian target of rapamycin (mTOR)	TT7HQAF	MTOR_HUMAN	Inhibitor	[21]

Sirolimus Interacts with 2 DTP Molecule(s)

DTP Name	DTP ID	UniProt ID	Mode of Action	REF
P-glycoprotein 1 (ABCB1)	DTUGYRD	MDR1_HUMAN	Substrate	[22]
Organic anion transporting polypeptide 1B1 (SLCO1B1)	DT3D8F0	SO1B1_HUMAN	Substrate	[23]

Sirolimus Interacts with 3 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	DE4LYSA	CP3A4_HUMAN	Metabolism	[24]
Cytochrome P450 3A5 (CYP3A5)	DEIBDNY	CP3A5_HUMAN	Metabolism	[25]
Cytochrome P450 3A7 (CYP3A7)	DERD86B	CP3A7_HUMAN	Metabolism	[25]

Sirolimus Interacts with 1 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Calcineurin subunit B type 1 (PPP3R1)	OTGQNFJQ	CANB1_HUMAN	Increases ADR	[14]

Test Results of This Drug Combination in Other Disease Systems

Indication	DrugCom ID	Cell Line	Status	REF
Adult T acute lymphoblastic leukemia	DC4MYEK	MOLT-4	Investigative	[1]
High grade ovarian serous adenocarcinoma	DCNBP7W	NCI\\/ADR-RES	Investigative	[1]

References

• [1] CheMBL Affinity Phenotypic Cellular Interaction Assay ID: CHEMBL1125966
• [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] Sirolimus FDA Label
• [5] FDA Approved Drug Products from FDA Official Website. 2019. Application Number: (ANDA) 201578.
• [6] Drugs@FDA. U.S. Food and Drug Administration. U.S. Department of Health & Human Services. 2015
• [7] 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: 6031).
• [8] Clinical pipeline report, company report or official report of the Pharmaceutical Research and Manufacturers of America (PhRMA)
• [9] ClinicalTrials.gov (NCT04341675) Sirolimus Treatment in Hospitalized Patients With COVID-19 Pneumonia. U.S. National Institutes of Health.
• [10] Aromatase inhibitors--theoretical concept and present experiences in the treatment of endometriosis. Zentralbl Gynakol. 2003 Jul-Aug;125(7-8):247-51.
• [11] 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.
• [12] Double-blind, randomised, multicentre endocrine trial comparing two letrozole doses, in postmenopausal breast cancer patients. Eur J Cancer. 1999 Feb;35(2):208-13.
• [13] 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.
• [14] ADReCS-Target: target profiles for aiding drug safety research and application. Nucleic Acids Res. 2018 Jan 4;46(D1):D911-D917. doi: 10.1093/nar/gkx899.
• [15] Aromatase inhibition, testosterone, and seizures. Epilepsy Behav. 2004 Apr;5(2):260-3. doi: 10.1016/j.yebeh.2003.12.001.
• [16] Dual inhibition of mTOR and estrogen receptor signaling in vitro induces cell death in models of breast cancer. Clin Cancer Res. 2005 Jul 15;11(14):5319-28. doi: 10.1158/1078-0432.CCR-04-2402.
• [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] 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.
• [19] Knockouts model the 100 best-selling drugs--will they model the next 100 Nat Rev Drug Discov. 2003 Jan;2(1):38-51.
• [20] The genomic landscape of nasopharyngeal carcinoma.Nat Genet. 2014 Aug;46(8):866-71.
• [21] Network-based drug repurposing for novel coronavirus 2019-nCoV/SARS-CoV-2. Cell Discov. 2020 Mar 16;6:14.
• [22] Pharmacogenetics of tacrolimus and sirolimus in renal transplant patients: from retrospective analyses to prospective studies. Transplant Proc. 2007 Sep;39(7):2142-4.
• [23] Pharmacokinetic and pharmacodynamic interactions between the immunosuppressant sirolimus and the lipid-lowering drug ezetimibe in healthy volunteers. Clin Pharmacol Ther. 2010 Jun;87(6):663-7.
• [24] Summary of information on human CYP enzymes: human P450 metabolism data. Drug Metab Rev. 2002 Feb-May;34(1-2):83-448.
• [25] Drug Interactions Flockhart Table