Details of the Drug Combination

General Information of Drug Combination (ID: DCBRVQY)

• Drug Combination Name: LY2835219 + Letrozole
• Indication: Breast Neoplasms; Status: Phase 1 [1]
• Component Drugs:
  LY2835219 (DM93VBZ): Small molecular drug
  Letrozole (DMH07Y3): Small molecular drug

Molecular Interaction Atlas of This Drug Combination

Indication(s) of LY2835219

Disease Entry	ICD 11	Status	REF
Breast cancer	2C60-2C65	Approved	[2]
Solid tumour/cancer	2A00-2F9Z	Phase 3	[3]

LY2835219 Interacts with 2 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Cyclin-dependent kinase 4 (CDK4)	TT0PG8F	CDK4_HUMAN	Modulator	[7]
Cyclin-dependent kinase 6 (CDK6)	TTO0FDJ	CDK6_HUMAN	Modulator	[7]

LY2835219 Interacts with 3 DTP Molecule(s)

DTP Name	DTP ID	UniProt ID	Mode of Action	REF
Organic cation transporter 2 (SLC22A2)	DT9IDPW	S22A2_HUMAN	Substrate	[8]
Multidrug and toxin extrusion protein 1 (SLC47A1)	DTZGT0P	S47A1_HUMAN	Substrate	[8]
Multidrug and toxin extrusion protein 2 (SLC47A2)	DT3TX4H	S47A2_HUMAN	Substrate	[8]

LY2835219 Interacts with 1 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	DE4LYSA	CP3A4_HUMAN	Metabolism	[9]

LY2835219 Interacts with 27 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Tripeptidyl-peptidase 1 (TPP1)	OT2LQ771	TPP1_HUMAN	Increases Expression	[6]
Glutaminase kidney isoform, mitochondrial (GLS)	OTGOZG2M	GLSK_HUMAN	Increases Expression	[6]
G2/mitotic-specific cyclin-B2 (CCNB2)	OTIEXTDK	CCNB2_HUMAN	Decreases Expression	[6]
Securin (PTTG1)	OTIMYS4W	PTTG1_HUMAN	Decreases Expression	[6]
G1/S-specific cyclin-E2 (CCNE2)	OTBBUKQQ	CCNE2_HUMAN	Decreases Expression	[10]
Apolipoprotein E (APOE)	OTFOWL2H	APOE_HUMAN	Increases Expression	[6]
Fibrinogen beta chain (FGB)	OT6RKLI9	FIBB_HUMAN	Decreases Expression	[6]
Fibrinogen gamma chain (FGG)	OT5BJSEX	FIBG_HUMAN	Decreases Expression	[6]
N-myc proto-oncogene protein (MYCN)	OTWD33K1	MYCN_HUMAN	Decreases Expression	[6]
Retinoblastoma-associated protein (RB1)	OTQJUJMZ	RB_HUMAN	Decreases Expression	[10]
ATP-dependent translocase ABCB1 (ABCB1)	OTEJROBO	MDR1_HUMAN	Decreases Activity	[11]
Gamma-enolase (ENO2)	OTRODL0T	ENOG_HUMAN	Increases Expression	[6]
SPARC (SPARC)	OTPN90H0	SPRC_HUMAN	Increases Expression	[6]
Apoptosis regulator Bcl-2 (BCL2)	OT9DVHC0	BCL2_HUMAN	Affects Expression	[12]
Cyclin-A2 (CCNA2)	OTPHHYZJ	CCNA2_HUMAN	Decreases Expression	[10]
G1/S-specific cyclin-D1 (CCND1)	OT8HPTKJ	CCND1_HUMAN	Affects Expression	[12]
Cyclin-dependent kinase inhibitor 1 (CDKN1A)	OTQWHCZE	CDN1A_HUMAN	Increases Expression	[6]
Caspase-3 (CASP3)	OTIJRBE7	CASP3_HUMAN	Increases Expression	[12]
Ran-specific GTPase-activating protein (RANBP1)	OTQE226K	RANG_HUMAN	Decreases Expression	[6]
Proliferation marker protein Ki-67 (MKI67)	OTA8N1QI	KI67_HUMAN	Decreases Expression	[6]
Apoptosis regulator BAX (BAX)	OTAW0V4V	BAX_HUMAN	Affects Expression	[12]
Ephrin-B3 (EFNB3)	OT12WTXQ	EFNB3_HUMAN	Decreases Expression	[6]
Insulin growth factor-like family member 2 (IGFL2)	OT64M0K7	IGFL2_HUMAN	Increases Expression	[6]
BRCA1-associated RING domain protein 1 (BARD1)	OTTC0Z9Y	BARD1_HUMAN	Decreases Expression	[6]
Fanconi anemia group E protein (FANCE)	OTKRPBW1	FANCE_HUMAN	Decreases Expression	[6]
Broad substrate specificity ATP-binding cassette transporter ABCG2 (ABCG2)	OTW8V2V1	ABCG2_HUMAN	Decreases Activity	[11]
Transforming acidic coiled-coil-containing protein 3 (TACC3)	OTRNEZTA	TACC3_HUMAN	Decreases Expression	[6]

Indication(s) of Letrozole

Disease Entry	ICD 11	Status	REF
Estrogen-receptor positive breast cancer	N.A.	Approved	[4]
Hormonally-responsive breast cancer	2C60-2C65	Approved	[5]

Letrozole Interacts with 1 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Aromatase (CYP19A1)	TTSZLWK	CP19A_HUMAN	Inhibitor	[13]

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	[14]
Aromatase (CYP19A1)	DEQX145	CP19A_HUMAN	Metabolism	[15]
Cytochrome P450 2A6 (CYP2A6)	DEJVYAZ	CP2A6_HUMAN	Metabolism	[16]

Letrozole Interacts with 18 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Aromatase (CYP19A1)	OTZ6XF74	CP19A_HUMAN	Decreases Activity	[17]
Cytochrome P450 3A4 (CYP3A4)	OTQGYY83	CP3A4_HUMAN	Increases Oxidation	[18]
Cytochrome P450 2A6 (CYP2A6)	OT52TWG3	CP2A6_HUMAN	Increases Oxidation	[18]
Adenylate kinase isoenzyme 1 (AK1)	OT614AR3	KAD1_HUMAN	Increases ADR	[19]
Dickkopf-related protein 1 (DKK1)	OTRDLUSP	DKK1_HUMAN	Increases Expression	[20]
Follitropin subunit beta (FSHB)	OTGLS283	FSHB_HUMAN	Increases Expression	[21]
Lutropin subunit beta (LHB)	OT5GBOVJ	LSHB_HUMAN	Increases Expression	[21]
Progesterone receptor (PGR)	OT0FZ3QE	PRGR_HUMAN	Decreases Expression	[22]
Leukemia inhibitory factor (LIF)	OTO46S5S	LIF_HUMAN	Increases Expression	[20]
Gap junction alpha-1 protein (GJA1)	OTT94MKL	CXA1_HUMAN	Decreases Expression	[23]
G1/S-specific cyclin-D1 (CCND1)	OT8HPTKJ	CCND1_HUMAN	Decreases Expression	[24]
G1/S-specific cyclin-D2 (CCND2)	OTDULQF9	CCND2_HUMAN	Decreases Expression	[24]
Cyclin-dependent kinase inhibitor 1 (CDKN1A)	OTQWHCZE	CDN1A_HUMAN	Increases Expression	[25]
Leukemia inhibitory factor receptor (LIFR)	OT36W9O5	LIFR_HUMAN	Increases Expression	[20]
Proliferation marker protein Ki-67 (MKI67)	OTA8N1QI	KI67_HUMAN	Decreases Expression	[22]
Small ribosomal subunit protein eS6 (RPS6)	OTT4D1LN	RS6_HUMAN	Decreases Phosphorylation	[24]
Lanosterol 14-alpha demethylase (CYP51A1)	OTAYHG9C	CP51A_HUMAN	Decreases Activity	[26]
Fibroblast growth factor 22 (FGF22)	OTVIX6J0	FGF22_HUMAN	Increases Expression	[20]

Test Results of This Drug Combination in Other Disease Systems

Indication	DrugCom ID	Cell Line	Status	REF
Breast Cancer	DCCPSYD	N. A.	Phase 3	[27]
Recurrent Endometrial Carcinoma	DC3V2G3	N. A.	Phase 2	[28]
Endometrial Cancer	DCPBCJQ	N. A.	Phase 2	[29]

References

• [1] ClinicalTrials.gov (NCT02057133) A Study of LY2835219 (Abemaciclib) in Combination With Therapies for Breast Cancer That Has Spread
• [2] 2017 FDA drug approvals.Nat Rev Drug Discov. 2018 Feb;17(2):81-85.
• [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: 7382).
• [4] Letrozole FDA Label
• [5] 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).
• [6] Biological specificity of CDK4/6 inhibitors: dose response relationship, in vivo signaling, and composite response signature. Oncotarget. 2017 Jul 4;8(27):43678-43691. doi: 10.18632/oncotarget.18435.
• [7] Interpreting expression profiles of cancers by genome-wide survey of breadth of expression in normal tissues. Genomics 2005 Aug;86(2):127-41.
• [8] Abemaciclib Inhibits Renal Tubular Secretion Without Changing Glomerular Filtration Rate. Clin Pharmacol Ther. 2019 May;105(5):1187-1195.
• [9] LiverTox: Clinical and Research Information on Drug-Induced Liver Injury [Internet]-Abemaciclib.
• [10] CDK4/6 Inhibition Controls Proliferation of Bladder Cancer and Transcription of RB1. J Urol. 2016 Mar;195(3):771-9. doi: 10.1016/j.juro.2015.08.082. Epub 2015 Aug 28.
• [11] Effect of abemaciclib (LY2835219) on enhancement of chemotherapeutic agents in ABCB1 and ABCG2 overexpressing cells in vitro and in vivo. Biochem Pharmacol. 2017 Jan 15;124:29-42. doi: 10.1016/j.bcp.2016.10.015. Epub 2016 Nov 2.
• [12] In vitro therapeutic effects of abemaciclib on triple-negative breast cancer cells. J Biochem Mol Toxicol. 2021 Sep;35(9):e22858. doi: 10.1002/jbt.22858. Epub 2021 Jul 26.
• [13] Aromatase inhibitors--theoretical concept and present experiences in the treatment of endometriosis. Zentralbl Gynakol. 2003 Jul-Aug;125(7-8):247-51.
• [14] 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.
• [15] Double-blind, randomised, multicentre endocrine trial comparing two letrozole doses, in postmenopausal breast cancer patients. Eur J Cancer. 1999 Feb;35(2):208-13.
• [16] 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.
• [17] Aromatase inhibition: translation into a successful therapeutic approach. Clin Cancer Res. 2005 Apr 15;11(8):2809-21. doi: 10.1158/1078-0432.CCR-04-2187.
• [18] Deactivation of anti-cancer drug letrozole to a carbinol metabolite by polymorphic cytochrome P450 2A6 in human liver microsomes. Xenobiotica. 2009 Nov;39(11):795-802. doi: 10.3109/00498250903171395.
• [19] 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.
• [20] 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.
• [21] Aromatase inhibition, testosterone, and seizures. Epilepsy Behav. 2004 Apr;5(2):260-3. doi: 10.1016/j.yebeh.2003.12.001.
• [22] 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.
• [23] 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.
• [24] 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.
• [25] 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.
• [26] 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.
• [27] ClinicalTrials.gov (NCT02246621) A Study of Nonsteroidal Aromatase Inhibitors Plus Abemaciclib (LY2835219) in Postmenopausal Women With Breast Cancer
• [28] ClinicalTrials.gov (NCT04469764) Abemaciclib for the Treatment of Recurrent Ovarian or Endometrial Cancer
• [29] ClinicalTrials.gov (NCT03675893) Abemaciclib + Letrozole +/- Metformin in Recurrent or Persistent Endometrial Cancer