Drug Information

Drug (ID: DG00403) and It's Reported Resistant Information
Name
Letrozole
Synonyms
Femara; Femera; Letoval; Letrozol; Novartis Brand of Letrozole; CGS 20267; CGS-20267; FEM-345; Femara (TN); Letrozole [USAN:INN]; CGS 20267, Femara, Piroxicam, Letrozole; Letrozole (JAN/USP/INN); 1-[Bis-(4-cyanophenyl)methyl]-1,2,4-triazole; 1-[bis(4-cyanophenyl)methyl]-1,2,4-triazole; 4,4'-((1h-1,2,4-triazol-1-yl)methylene)dibenzonitrile; 4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile; 4,4'-(1H-1,2,4-triazol-1-yl-methylene)-bis(benzonitrile); 4,4'-(1H-1,2,4-triazol-1-ylmethanediyl)dibenzonitrile; 4,4'-(1H-1,2,4-triazol-1-ylmethylene)bis-Benzonitrile Letrozole; 4,4'-(1h-1,2,4-triazol-1-ylmethylene) bis-benzonitrile; 4,4'-(1h-1,2,4-triazol-1-ylmethylene)bis-benzonitrile; 4,4'-(1h-1,2,4-triazol-1-ylmethylene)bisbenzonitrile; 4-[(4-cyanophenyl)-(1,2,4-triazol-1-yl)methyl]benzonitrile
    Click to Show/Hide
Indication
In total 1 Indication(s)
Breast cancer [ICD-11: 2C60]
Approved
[1]
Structure
Drug Resistance Disease(s)
Disease(s) with Clinically Reported Resistance for This Drug (1 diseases)
Breast cancer [ICD-11: 2C60]
[2]
Disease(s) with Resistance Information Discovered by Cell Line Test for This Drug (1 diseases)
Breast cancer [ICD-11: 2C60]
[3]
Target Aromatase (CYP19A1) CP19A_HUMAN [1]
Click to Show/Hide the Molecular Information and External Link(s) of This Drug
Formula
C17H11N5
IsoSMILES
C1=CC(=CC=C1C#N)C(C2=CC=C(C=C2)C#N)N3C=NC=N3
InChI
1S/C17H11N5/c18-9-13-1-5-15(6-2-13)17(22-12-20-11-21-22)16-7-3-14(10-19)4-8-16/h1-8,11-12,17H
InChIKey
HPJKCIUCZWXJDR-UHFFFAOYSA-N
PubChem CID
3902
ChEBI ID
CHEBI:6413
TTD Drug ID
D0C1WH
INTEDE ID
DR0929
DrugBank ID
DB01006
Type(s) of Resistant Mechanism of This Drug due to Structure Alteration
  UAPP: Unusual Activation of Pro-survival Pathway
Drug Resistance Data Categorized by Their Corresponding Diseases
ICD-02: Benign/in-situ/malignant neoplasm
Click to Show/Hide the Resistance Disease of This Class
Breast cancer [ICD-11: 2C60]
Click to Show/Hide
Drug Resistance Data Categorized by Their Corresponding Mechanisms
  Unusual Activation of Pro-survival Pathway (UAPP) Click to Show/Hide
Key Molecule: Estrogen receptor alpha (ESR1) [2], [4]
Resistant Disease Breast cancer [ICD-11: 2C60.3]
 Disease Info 
Molecule Alteration Missense mutation
p.Y537S
 Molecule Info 
Wild Type Structure Method: X-ray diffraction Resolution: 1.60  Å
PDB: 2IOG
Mutant Type Structure Method: X-ray diffraction Resolution: 1.50  Å
PDB: 5DXE
   Download The Information of Sequence       Download The Structure File   
RMSD: 1.7
TM score: 0.91757
Amino acid change:
Y537S
 : Wild Type Structure
 : Mutant Type Structure
  Mutation site(s) have been marked in red
-
-
M
-
D
-
P
-
M
-
I
-
K
300
|
-
R
-
S
-
K
-
K
-
N
-
S
-
L
-
A
-
L
S
S
310
|
L
L
T
T
A
A
D
D
Q
Q
M
M
V
V
S
S
A
A
L
L
320
|
L
L
D
D
A
A
E
E
P
P
P
P
I
I
L
L
Y
Y
S
S
330
|
E
E
Y
Y
D
D
P
P
T
T
R
R
P
P
F
F
S
S
E
E
340
|
A
A
S
S
M
M
M
M
G
G
L
L
L
L
T
T
N
N
L
L
350
|
A
A
D
D
R
R
E
E
L
L
V
V
H
H
M
M
I
I
N
N
360
|
W
W
A
A
K
K
R
R
V
V
P
P
G
G
F
F
V
V
D
D
370
|
L
L
T
T
L
L
H
H
D
D
Q
Q
V
V
H
H
L
L
L
L
380
|
E
E
C
-
A
A
W
W
L
L
E
E
I
I
L
L
M
M
I
I
390
|
G
G
L
L
V
V
W
W
R
R
S
S
M
M
E
E
H
H
P
P
400
|
G
G
K
K
L
L
L
L
F
F
A
A
P
P
N
N
L
L
L
L
410
|
L
L
D
D
R
R
N
N
Q
Q
G
G
K
K
C
-
V
V
E
E
420
|
G
G
M
M
V
V
E
E
I
I
F
F
D
D
M
M
L
L
L
L
430
|
A
A
T
T
S
S
S
S
R
R
F
F
R
R
M
M
M
M
N
N
440
|
L
L
Q
Q
G
G
E
E
E
E
F
F
V
V
C
C
L
L
K
K
450
|
S
S
I
I
I
I
L
L
L
L
N
N
S
S
G
G
V
V
Y
Y
460
|
T
T
F
F
L
L
S
S
S
S
T
T
L
L
K
K
S
S
L
L
470
|
E
E
E
E
K
K
D
D
H
H
I
I
H
H
R
R
V
V
L
L
480
|
D
D
K
K
I
I
T
T
D
D
T
T
L
L
I
I
H
H
L
L
490
|
M
M
A
A
K
K
A
A
G
G
L
L
T
T
L
L
Q
Q
Q
Q
500
|
Q
Q
H
H
Q
Q
R
R
L
L
A
A
Q
Q
L
L
L
L
L
L
510
|
I
I
L
L
S
S
H
H
I
I
R
R
H
H
M
M
S
S
N
N
520
|
K
K
G
G
M
M
E
E
H
H
L
L
Y
Y
S
S
M
M
K
K
530
|
C
-
K
K
N
N
V
V
V
V
P
P
L
L
Y
S
D
D
L
L
540
|
L
L
L
L
E
E
M
M
L
L
D
D
A
A
H
H
R
R
L
L
550
|
H
H
A
A
P
P
T
T
S
S
Click to Show/Hide the Structure
Experimental Note Identified from the Human Clinical Data
In Vivo Model A retrospective survey in conducting clinical studies Homo sapiens
Experiment for
Molecule Alteration		 Droplet digital polymerase chain reaction assay
Experiment for
Drug Resistance		 Chest x-ray assay; Computed tomography assay; Magnetic resonance imaging assay; Positron emission tomography assay
Mechanism Description We have developed a ddPCR-based method for the sensitive detection and quantification of 4 representative ESR1 mutations, Y537S, Y537N, Y537C, and D538G, in 325 breast cancer specimens, in which 270 primary breast cancer and 55 MBC specimens.
Key Molecule: Estrogen receptor alpha (ESR1) [1]
Resistant Disease Breast cancer [ICD-11: 2C60.3]
 Disease Info 
Molecule Alteration Missense mutation
p.D538G
 Molecule Info 
Wild Type Structure Method: X-ray diffraction Resolution: 1.60  Å
PDB: 2IOG
Mutant Type Structure Method: X-ray diffraction Resolution: 1.90  Å
PDB: 4PXM
   Download The Information of Sequence       Download The Structure File   
RMSD: 1.86
TM score: 0.90649
Amino acid change:
D538G
 : Wild Type Structure
 : Mutant Type Structure
  Mutation site(s) have been marked in red
-
-
V
-
D
-
L
-
G
-
T
-
E
290
|
-
N
-
L
-
Y
-
F
-
Q
-
S
-
N
-
A
-
M
-
K
300
|
-
R
-
S
-
K
-
K
-
N
-
S
-
L
-
A
-
L
S
S
310
|
L
L
T
T
A
A
D
D
Q
Q
M
M
V
V
S
S
A
A
L
L
320
|
L
L
D
D
A
A
E
E
P
P
P
P
I
I
L
L
Y
Y
S
S
330
|
E
E
Y
Y
D
D
P
P
T
T
R
R
P
P
F
F
S
S
E
E
340
|
A
A
S
S
M
M
M
M
G
G
L
L
L
L
T
T
N
N
L
L
350
|
A
A
D
D
R
R
E
E
L
L
V
V
H
H
M
M
I
I
N
N
360
|
W
W
A
A
K
K
R
R
V
V
P
P
G
G
F
F
V
V
D
D
370
|
L
L
T
T
L
L
H
H
D
D
Q
Q
V
V
H
H
L
L
L
L
380
|
E
E
C
C
A
A
W
W
L
L
E
E
I
I
L
L
M
M
I
I
390
|
G
G
L
L
V
V
W
W
R
R
S
S
M
M
E
E
H
H
P
P
400
|
G
G
K
K
L
L
L
L
F
F
A
A
P
P
N
N
L
L
L
L
410
|
L
L
D
D
R
R
N
N
Q
Q
G
G
K
K
C
C
V
V
E
E
420
|
G
G
M
M
V
V
E
E
I
I
F
F
D
D
M
M
L
L
L
L
430
|
A
A
T
T
S
S
S
S
R
R
F
F
R
R
M
M
M
M
N
N
440
|
L
L
Q
Q
G
G
E
E
E
E
F
F
V
V
C
C
L
L
K
K
450
|
S
S
I
I
I
I
L
L
L
L
N
N
S
S
G
G
V
V
Y
Y
460
|
T
T
F
F
L
L
S
S
S
S
T
T
L
L
K
K
S
S
L
L
470
|
E
E
E
E
K
K
D
D
H
H
I
I
H
H
R
R
V
V
L
L
480
|
D
D
K
K
I
I
T
T
D
D
T
T
L
L
I
I
H
H
L
L
490
|
M
M
A
A
K
K
A
A
G
G
L
L
T
T
L
L
Q
Q
Q
Q
500
|
Q
Q
H
H
Q
Q
R
R
L
L
A
A
Q
Q
L
L
L
L
L
L
510
|
I
I
L
L
S
S
H
H
I
I
R
R
H
H
M
M
S
S
N
N
520
|
K
K
G
G
M
M
E
E
H
H
L
L
Y
Y
S
S
M
M
K
K
530
|
C
C
K
K
N
N
V
V
V
V
P
P
L
L
Y
Y
D
G
L
L
540
|
L
L
L
L
E
E
M
M
L
L
D
D
A
A
H
H
R
R
L
L
550
|
H
H
A
A
P
P
T
T
S
S
Click to Show/Hide the Structure
Experimental Note Identified from the Human Clinical Data
In Vivo Model A retrospective survey in conducting clinical studies Homo sapiens
Experiment for
Molecule Alteration		 Sanger sequencing assay; dPCR assay
Mechanism Description Acquired mutations in the estrogen-receptor gene ESR1 can be a marker of resistance to aromatase inhibitors in metastatic breast cancer.
Key Molecule: Estrogen receptor alpha (ESR1) [2]
Resistant Disease Breast cancer [ICD-11: 2C60.3]
 Disease Info 
Molecule Alteration Missense mutation
p.D538G
 Molecule Info 
Wild Type Structure Method: X-ray diffraction Resolution: 1.60  Å
PDB: 2IOG
Mutant Type Structure Method: X-ray diffraction Resolution: 1.90  Å
PDB: 4PXM
   Download The Information of Sequence       Download The Structure File   
RMSD: 1.86
TM score: 0.90649
Amino acid change:
D538G
 : Wild Type Structure
 : Mutant Type Structure
  Mutation site(s) have been marked in red
-
-
V
-
D
-
L
-
G
-
T
-
E
290
|
-
N
-
L
-
Y
-
F
-
Q
-
S
-
N
-
A
-
M
-
K
300
|
-
R
-
S
-
K
-
K
-
N
-
S
-
L
-
A
-
L
S
S
310
|
L
L
T
T
A
A
D
D
Q
Q
M
M
V
V
S
S
A
A
L
L
320
|
L
L
D
D
A
A
E
E
P
P
P
P
I
I
L
L
Y
Y
S
S
330
|
E
E
Y
Y
D
D
P
P
T
T
R
R
P
P
F
F
S
S
E
E
340
|
A
A
S
S
M
M
M
M
G
G
L
L
L
L
T
T
N
N
L
L
350
|
A
A
D
D
R
R
E
E
L
L
V
V
H
H
M
M
I
I
N
N
360
|
W
W
A
A
K
K
R
R
V
V
P
P
G
G
F
F
V
V
D
D
370
|
L
L
T
T
L
L
H
H
D
D
Q
Q
V
V
H
H
L
L
L
L
380
|
E
E
C
C
A
A
W
W
L
L
E
E
I
I
L
L
M
M
I
I
390
|
G
G
L
L
V
V
W
W
R
R
S
S
M
M
E
E
H
H
P
P
400
|
G
G
K
K
L
L
L
L
F
F
A
A
P
P
N
N
L
L
L
L
410
|
L
L
D
D
R
R
N
N
Q
Q
G
G
K
K
C
C
V
V
E
E
420
|
G
G
M
M
V
V
E
E
I
I
F
F
D
D
M
M
L
L
L
L
430
|
A
A
T
T
S
S
S
S
R
R
F
F
R
R
M
M
M
M
N
N
440
|
L
L
Q
Q
G
G
E
E
E
E
F
F
V
V
C
C
L
L
K
K
450
|
S
S
I
I
I
I
L
L
L
L
N
N
S
S
G
G
V
V
Y
Y
460
|
T
T
F
F
L
L
S
S
S
S
T
T
L
L
K
K
S
S
L
L
470
|
E
E
E
E
K
K
D
D
H
H
I
I
H
H
R
R
V
V
L
L
480
|
D
D
K
K
I
I
T
T
D
D
T
T
L
L
I
I
H
H
L
L
490
|
M
M
A
A
K
K
A
A
G
G
L
L
T
T
L
L
Q
Q
Q
Q
500
|
Q
Q
H
H
Q
Q
R
R
L
L
A
A
Q
Q
L
L
L
L
L
L
510
|
I
I
L
L
S
S
H
H
I
I
R
R
H
H
M
M
S
S
N
N
520
|
K
K
G
G
M
M
E
E
H
H
L
L
Y
Y
S
S
M
M
K
K
530
|
C
C
K
K
N
N
V
V
V
V
P
P
L
L
Y
Y
D
G
L
L
540
|
L
L
L
L
E
E
M
M
L
L
D
D
A
A
H
H
R
R
L
L
550
|
H
H
A
A
P
P
T
T
S
S
Click to Show/Hide the Structure
Experimental Note Identified from the Human Clinical Data
In Vivo Model A retrospective survey in conducting clinical studies Homo sapiens
Experiment for
Molecule Alteration		 Whole-genome sequencing assay
Mechanism Description Whole-exome and transcriptome analysis showed that six cases harbored mutations of ESR1 affecting its ligand-binding domain (LBD), all of whom had been treated with anti-estrogens and estrogen deprivation therapies.
References
Ref 1 Short report: Monitoring ESR1 mutations by circulating tumor DNA in aromatase inhibitor resistant metastatic breast cancer. Int J Cancer. 2015 Nov 15;137(10):2513-9. doi: 10.1002/ijc.29612. Epub 2015 Jun 11.
Ref 2 Activating ESR1 mutations in hormone-resistant metastatic breast cancer. Nat Genet. 2013 Dec;45(12):1446-51. doi: 10.1038/ng.2823. Epub 2013 Nov 3.
Ref 3 Molecular mechanisms of secondary imatinib resistance in patients with gastrointestinal stromal tumors. J Cancer Res Clin Oncol. 2010 Jul;136(7):1065-71. doi: 10.1007/s00432-009-0753-7. Epub 2009 Dec 31.
Ref 4 Droplet digital polymerase chain reaction assay for screening of ESR1 mutations in 325 breast cancer specimens. Transl Res. 2015 Dec;166(6):540-553.e2. doi: 10.1016/j.trsl.2015.09.003. Epub 2015 Sep 14.

If you find any error in data or bug in web service, please kindly report it to Dr. Sun and Dr. Yu.