Details of the Drug Combination

General Information of Drug Combination (ID: DCHGDDP)

• Drug Combination Name: Lapatinib + Letrozole
• Indication: Neoplasms, Breast; Status: Phase 1 [1]
• Component Drugs:
  Lapatinib (DM3BH1Y): Small molecular drug
  Letrozole (DMH07Y3): Small molecular drug

Molecular Interaction Atlas of This Drug Combination

Indication(s) of Lapatinib

Disease Entry	ICD 11	Status	REF
Breast cancer	2C60-2C65	Approved	[2]
Gastroesophageal junction adenocarcinoma	2B71	Approved	[3]
Melanoma	2C30	Approved	[3]

Lapatinib Interacts with 3 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Erbb2 tyrosine kinase receptor (HER2)	TT6EO5L	ERBB2_HUMAN	Inhibitor	[7]
Epidermal growth factor receptor (EGFR)	TTGKNB4	EGFR_HUMAN	Inhibitor	[7]
Eukaryotic elongation factor 2 kinase (eEF-2K)	TT1QFLA	EF2K_HUMAN	Inhibitor	[8]

Lapatinib Interacts with 2 DTP Molecule(s)

DTP Name	DTP ID	UniProt ID	Mode of Action	REF
P-glycoprotein 1 (ABCB1)	DTUGYRD	MDR1_HUMAN	Substrate	[9]
Breast cancer resistance protein (ABCG2)	DTI7UX6	ABCG2_HUMAN	Substrate	[10]

Lapatinib Interacts with 4 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	DE4LYSA	CP3A4_HUMAN	Metabolism	[11]
Cytochrome P450 3A5 (CYP3A5)	DEIBDNY	CP3A5_HUMAN	Metabolism	[12]
Cytochrome P450 2C8 (CYP2C8)	DES5XRU	CP2C8_HUMAN	Metabolism	[11]
Mephenytoin 4-hydroxylase (CYP2C19)	DEGTFWK	CP2CJ_HUMAN	Metabolism	[12]

Lapatinib Interacts with 36 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Epidermal growth factor receptor (EGFR)	OTAPLO1S	EGFR_HUMAN	Decreases Activity	[13]
Bile salt export pump (ABCB11)	OTRU7THO	ABCBB_HUMAN	Decreases Activity	[14]
Superoxide dismutase , mitochondrial (SOD2)	OTIWXGZ9	SODM_HUMAN	Increases Expression	[15]
Heme oxygenase 1 (HMOX1)	OTC1W6UX	HMOX1_HUMAN	Increases Expression	[15]
NAD(P)H dehydrogenase 1 (NQO1)	OTZGGIVK	NQO1_HUMAN	Increases Expression	[15]
Nuclear factor erythroid 2-related factor 2 (NFE2L2)	OT0HENJ5	NF2L2_HUMAN	Increases Activity	[15]
Baculoviral IAP repeat-containing protein 5 (BIRC5)	OTILXZYL	BIRC5_HUMAN	Decreases Expression	[16]
Estrogen receptor (ESR1)	OTKLU61J	ESR1_HUMAN	Decreases Activity	[13]
Poly polymerase 1 (PARP1)	OT310QSG	PARP1_HUMAN	Increases Cleavage	[17]
Apoptosis regulator Bcl-2 (BCL2)	OT9DVHC0	BCL2_HUMAN	Decreases Expression	[18]
DNA topoisomerase 1 (TOP1)	OT51O0CF	TOP1_HUMAN	Decreases Expression	[19]
DNA topoisomerase 2-alpha (TOP2A)	OT6LPS08	TOP2A_HUMAN	Decreases Expression	[19]
Histone H2AX (H2AX)	OT18UX57	H2AX_HUMAN	Increases Expression	[19]
Cyclin-A2 (CCNA2)	OTPHHYZJ	CCNA2_HUMAN	Decreases Expression	[17]
Phosphatidylcholine translocator ABCB4 (ABCB4)	OTE6PY83	MDR3_HUMAN	Decreases Activity	[20]
Receptor tyrosine-protein kinase erbB-3 (ERBB3)	OTRSST0A	ERBB3_HUMAN	Decreases Activity	[21]
Alanine aminotransferase 1 (GPT)	OTOXOA0Q	ALAT1_HUMAN	Increases Secretion	[22]
G1/S-specific cyclin-D1 (CCND1)	OT8HPTKJ	CCND1_HUMAN	Decreases Expression	[13]
Mitogen-activated protein kinase 3 (MAPK3)	OTCYKGKO	MK03_HUMAN	Decreases Activity	[17]
Mitogen-activated protein kinase 1 (MAPK1)	OTH85PI5	MK01_HUMAN	Decreases Activity	[17]
RAC-alpha serine/threonine-protein kinase (AKT1)	OT8H2YY7	AKT1_HUMAN	Decreases Activity	[13]
DNA replication licensing factor MCM7 (MCM7)	OT6FXC6K	MCM7_HUMAN	Decreases Expression	[17]
Caspase-3 (CASP3)	OTIJRBE7	CASP3_HUMAN	Increases Activity	[19]
Cyclin-dependent kinase inhibitor 1B (CDKN1B)	OTNY5LLZ	CDN1B_HUMAN	Increases Expression	[13]
Caspase-7 (CASP7)	OTAPJ040	CASP7_HUMAN	Increases Activity	[19]
Caspase-9 (CASP9)	OTD4RFFG	CASP9_HUMAN	Increases Activity	[19]
Apoptosis regulator BAX (BAX)	OTAW0V4V	BAX_HUMAN	Increases Expression	[18]
Cytochrome P450 1B1 (CYP1B1)	OTYXFLSD	CP1B1_HUMAN	Decreases Activity	[23]
GTPase KRas (KRAS)	OT78QCN8	RASK_HUMAN	Decreases Response To Substance	[24]
HLA class II histocompatibility antigen, DQ alpha 1 chain (HLA-DQA1)	OTC6GISG	DQA1_HUMAN	Increases ADR	[25]
Zinc finger protein SNAI1 (SNAI1)	OTDPYAMC	SNAI1_HUMAN	Decreases Response To Substance	[26]
Cytochrome P450 1A1 (CYP1A1)	OTE4EFH8	CP1A1_HUMAN	Increases Metabolism	[19]
Cytochrome P450 3A7 (CYP3A7)	OTTCDHHM	CP3A7_HUMAN	Increases Metabolism	[19]
Transforming growth factor beta-1 proprotein (TGFB1)	OTV5XHVH	TGFB1_HUMAN	Decreases Response To Substance	[26]
Tenascin-X (TNXB)	OTVBWAV5	TENX_HUMAN	Increases ADR	[25]
HLA class II histocompatibility antigen, DQ beta 1 chain (HLA-DQB1)	OTVVI3UI	DQB1_HUMAN	Increases ADR	[25]

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	[27]

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	[28]
Aromatase (CYP19A1)	DEQX145	CP19A_HUMAN	Metabolism	[29]
Cytochrome P450 2A6 (CYP2A6)	DEJVYAZ	CP2A6_HUMAN	Metabolism	[30]

Letrozole Interacts with 18 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Aromatase (CYP19A1)	OTZ6XF74	CP19A_HUMAN	Decreases Activity	[31]
Cytochrome P450 3A4 (CYP3A4)	OTQGYY83	CP3A4_HUMAN	Increases Oxidation	[32]
Cytochrome P450 2A6 (CYP2A6)	OT52TWG3	CP2A6_HUMAN	Increases Oxidation	[32]
Adenylate kinase isoenzyme 1 (AK1)	OT614AR3	KAD1_HUMAN	Increases ADR	[33]
Dickkopf-related protein 1 (DKK1)	OTRDLUSP	DKK1_HUMAN	Increases Expression	[34]
Follitropin subunit beta (FSHB)	OTGLS283	FSHB_HUMAN	Increases Expression	[35]
Lutropin subunit beta (LHB)	OT5GBOVJ	LSHB_HUMAN	Increases Expression	[35]
Progesterone receptor (PGR)	OT0FZ3QE	PRGR_HUMAN	Decreases Expression	[36]
Leukemia inhibitory factor (LIF)	OTO46S5S	LIF_HUMAN	Increases Expression	[34]
Gap junction alpha-1 protein (GJA1)	OTT94MKL	CXA1_HUMAN	Decreases Expression	[37]
G1/S-specific cyclin-D1 (CCND1)	OT8HPTKJ	CCND1_HUMAN	Decreases Expression	[38]
G1/S-specific cyclin-D2 (CCND2)	OTDULQF9	CCND2_HUMAN	Decreases Expression	[38]
Cyclin-dependent kinase inhibitor 1 (CDKN1A)	OTQWHCZE	CDN1A_HUMAN	Increases Expression	[39]
Leukemia inhibitory factor receptor (LIFR)	OT36W9O5	LIFR_HUMAN	Increases Expression	[34]
Proliferation marker protein Ki-67 (MKI67)	OTA8N1QI	KI67_HUMAN	Decreases Expression	[36]
Small ribosomal subunit protein eS6 (RPS6)	OTT4D1LN	RS6_HUMAN	Decreases Phosphorylation	[38]
Lanosterol 14-alpha demethylase (CYP51A1)	OTAYHG9C	CP51A_HUMAN	Decreases Activity	[40]
Fibroblast growth factor 22 (FGF22)	OTVIX6J0	FGF22_HUMAN	Increases Expression	[34]

Test Results of This Drug Combination in Other Disease Systems

Indication	DrugCom ID	Cell Line	Status	REF
Breast Neoplasms	DCKK4B7	N. A.	Phase 1	[41]

References

• [1] ClinicalTrials.gov (NCT00422903) Letrozole In Combination With Lapatinib In Neoadjuvant Treatment Of Early Breast Cancer
• [2] 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: 5692).
• [3] Lapatinib FDA Label
• [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] UGT-dependent regioselective glucuronidation of ursodeoxycholic acid and obeticholic acid and selective transport of the consequent acyl glucuronides by OATP1B1 and 1B3. Chem Biol Interact. 2019 Sep 1;310:108745. doi: 10.1016/j.cbi.2019.108745. Epub 2019 Jul 9.
• [7] Triple negative breast cancer--current status and prospective targeted treatment based on HER1 (EGFR), TOP2A and C-MYC gene assessment. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub. 2009 Mar;153(1):13-7.
• [8] Inhibition of eEF-2 kinase sensitizes human nasopharyngeal carcinoma cells to lapatinib-induced apoptosis through the Src and Erk pathways.BMC Cancer. 2016 Oct 19;16(1):813.
• [9] Tarascon Pocket Pharmacopoeia 2018 Classic Shirt-Pocket Edition.
• [10] The role of efflux and uptake transporters in [N-{3-chloro-4-[(3-fluorobenzyl)oxy]phenyl}-6-[5-({[2-(methylsulfonyl)ethyl]amino}methyl)-2-furyl]-4-quinazolinamine (GW572016, lapatinib) disposition and drug interactions. Drug Metab Dispos. 2008 Apr;36(4):695-701.
• [11] Mechanism-based inactivation of cytochrome P450 3A4 by lapatinib. Mol Pharmacol. 2010 Oct;78(4):693-703.
• [12] Clinical pharmacokinetics of tyrosine kinase inhibitors. Cancer Treat Rev. 2009 Dec;35(8):692-706.
• [13] The dual ErbB1/ErbB2 inhibitor, lapatinib (GW572016), cooperates with tamoxifen to inhibit both cell proliferation- and estrogen-dependent gene expression in antiestrogen-resistant breast cancer. Cancer Res. 2005 Jan 1;65(1):18-25.
• [14] Interference with bile salt export pump function is a susceptibility factor for human liver injury in drug development. Toxicol Sci. 2010 Dec; 118(2):485-500.
• [15] P450 3A-catalyzed O-dealkylation of lapatinib induces mitochondrial stress and activates Nrf2. Chem Res Toxicol. 2016 May 16;29(5):784-96.
• [16] Combining lapatinib (GW572016), a small molecule inhibitor of ErbB1 and ErbB2 tyrosine kinases, with therapeutic anti-ErbB2 antibodies enhances apoptosis of ErbB2-overexpressing breast cancer cells. Oncogene. 2005 Sep 15;24(41):6213-21. doi: 10.1038/sj.onc.1208774.
• [17] CDK4/6 inhibition provides a potent adjunct to Her2-targeted therapies in preclinical breast cancer models. Genes Cancer. 2014 Jul;5(7-8):261-72. doi: 10.18632/genesandcancer.24.
• [18] Effects of lapatinib on cell proliferation and apoptosis in NB4 cells. Oncol Lett. 2018 Jan;15(1):235-242. doi: 10.3892/ol.2017.7342. Epub 2017 Nov 3.
• [19] The involvement of hepatic cytochrome P450s in the cytotoxicity of lapatinib. Toxicol Sci. 2023 Dec 21;197(1):69-78. doi: 10.1093/toxsci/kfad099.
• [20] Evaluating the Role of Multidrug Resistance Protein 3 (MDR3) Inhibition in Predicting Drug-Induced Liver Injury Using 125 Pharmaceuticals. Chem Res Toxicol. 2017 May 15;30(5):1219-1229. doi: 10.1021/acs.chemrestox.7b00048. Epub 2017 May 4.
• [21] Suppression of HER2/HER3-mediated growth of breast cancer cells with combinations of GDC-0941 PI3K inhibitor, trastuzumab, and pertuzumab. Clin Cancer Res. 2009 Jun 15;15(12):4147-56. doi: 10.1158/1078-0432.CCR-08-2814. Epub 2009 Jun 9.
• [22] Cytotoxicity of 34 FDA approved small-molecule kinase inhibitors in primary rat and human hepatocytes. Toxicol Lett. 2018 Jul;291:138-148. doi: 10.1016/j.toxlet.2018.04.010. Epub 2018 Apr 12.
• [23] Association of CYP1A1 and CYP1B1 inhibition in in vitro assays with drug-induced liver injury. J Toxicol Sci. 2021;46(4):167-176. doi: 10.2131/jts.46.167.
• [24] The K-Ras effector p38 MAPK confers intrinsic resistance to tyrosine kinase inhibitors by stimulating EGFR transcription and EGFR dephosphorylation. J Biol Chem. 2017 Sep 8;292(36):15070-15079. doi: 10.1074/jbc.M117.779488. Epub 2017 Jul 24.
• [25] HLA-DQA1*02:01 is a major risk factor for lapatinib-induced hepatotoxicity in women with advanced breast cancer. J Clin Oncol. 2011 Feb 20;29(6):667-73. doi: 10.1200/JCO.2010.31.3197. Epub 2011 Jan 18.
• [26] Niclosamide inhibits epithelial-mesenchymal transition and tumor growth in lapatinib-resistant human epidermal growth factor receptor 2-positive breast cancer. Int J Biochem Cell Biol. 2016 Feb;71:12-23. doi: 10.1016/j.biocel.2015.11.014. Epub 2015 Nov 28.
• [27] Aromatase inhibitors--theoretical concept and present experiences in the treatment of endometriosis. Zentralbl Gynakol. 2003 Jul-Aug;125(7-8):247-51.
• [28] 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.
• [29] Double-blind, randomised, multicentre endocrine trial comparing two letrozole doses, in postmenopausal breast cancer patients. Eur J Cancer. 1999 Feb;35(2):208-13.
• [30] 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.
• [31] 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.
• [32] 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.
• [33] 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.
• [34] 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.
• [35] Aromatase inhibition, testosterone, and seizures. Epilepsy Behav. 2004 Apr;5(2):260-3. doi: 10.1016/j.yebeh.2003.12.001.
• [36] 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.
• [37] 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.
• [38] 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.
• [39] 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.
• [40] 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.
• [41] ClinicalTrials.gov (NCT00073528) Study Comparing Lapatinib (GW572016) And Letrozole Versus Letrozole In Subjects With Advanced Or Metastatic Breast Cancer