Anti Breast Cancer Femara Letrozole for Tumor

Basic informations:
CAS NO: 112809-51-5
​Content: 99% min
Molecular Formula: C17H11N5
Molecular Weight: 285.31
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Product Details

Anti Breast Cancer Femara Letrozole for tumor Anti Estrogen Steroids 633-35-2 Prohormones Atd Muscle Building Steorids


Basic informations:

CAS NO: 112809-51-5
Content: 99% min  
Molecular Formula: C17H11N5
Molecular Weight: 285.31
Appearance white
or off-white powder
Melting point 181-183 ° C

What is Letrozole?

Letrozole (trade name Femara) is an oral non-steroidal aromatase inhibitor for the treatment of hormonally-responsive breast cancer after surgery. 

Functions of Letrozole:

1. Treatment of postmenopausal women with advanced breast cancer (estrogen receptor, progesterone receptor positive or unknown receptor status), used for anti-estrogen therapy after the failure of second-line treatment;

2. For locally advanced or spread after the first-line treatment of postmenopausal breast cancer (foreign data);

3. For the received standard adjuvant tamoxifen therapy in postmenopausal breast cancer after five years of adjuvant therapy in patients with extension (foreign data);

4. Postoperative adjuvant therapy for hormone-positive early breast cancer patients.

Distinctions Between Letrozole and Anastrozole:
Letrozole tablets: suitable for advanced breast cancer after menopause, most used in the treatment of anti-estrogen treatment failure after second-line therapy.
Anastrozole: an effective selective inhibitor for three azole aromatase, it inhibits the aromatase relied by cytochrome P-450, further blocks estrogen biosynthesis, which is the main factor to stimulate breast cancer cell growth. The 50% inhibitory concentration (IC50) value of human placenta aromatase is 15 nmol/L. 

Letrozole COA:





White or off-white crystaline powder

Crystalline powder


Soluble in Chloroform;
Soluble in ethanol when heated



(1)Maximum absorption in wavelength of 240 nm
Minimum absorption in wavelength of 215 nm


(2)Infrared spectrum should be in accordance the dominant peak of contrast

In accordance with the dominant peak of contrast

Melting points



Related substances



Single impurity



Loss on drying



(On anhydrous basis)




Conforms Specifications of Enterprise Standard.

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Some Question :
Question 1, How do you pack the order ?
Discreet package, the packing suits you best would be choosen to cross customs safely

Question 2, What is your shipping method ?
Shipping by express (FedEx,UPS,DHL,EMS,HKEMS,TNT), and cheapest by airmail

Question 3, if my order seized by custom, what do you do ?
Resending police if the tracking number do not update online or it sezied by custom

Question 4, What is your payment accept ?
Safe and fast payment: Western Union, Money Gram, T/T, Bitcoin

Question 5, Will you supply tracking number ?
Yes, we supply tracking number for following. In general, once we supply the tracking number to you ,you can track the parcel information within 1-2 business days

Question 6, How many days will it take to my country after I do the payment ?
In general, fastest with 3-5 business, slowest 5-7 business days

Hot selling market :

United State(USA), United Kingdom(UK), Australia, Canada, Spain, France, Germany, Russia, Brasil(Brazil), Ukraine, South Africa , Norway, Poland, Netherlands(Holland), Slovakia, Georgia, New Zealand, Sweden etc.


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