Toremifene Citrate (NK 622)

Catalog No.S1776 Synonyms: NSC 613680

For research use only.

Toremifene Citrate (NK 622, NSC 613680) is an oral selective estrogen receptor modulator (SERM), used in the treatment of advanced breast cancer.

Toremifene Citrate (NK 622) Chemical Structure

CAS No. 89778-27-8

Selleck's Toremifene Citrate (NK 622) has been cited by 8 Publications

2 Customer Reviews

Purity & Quality Control

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Biological Activity

Description Toremifene Citrate (NK 622, NSC 613680) is an oral selective estrogen receptor modulator (SERM), used in the treatment of advanced breast cancer.
Estrogen receptor [1]
In vitro

Toremifene (7.5 mM) causes approximately 60% of the cells to exhibit morphologic characteristics typical of cells undergoing programmed death, or apoptosis in human breast cancer cells. Toremifene (5-10 mM) results in elevated levels of TRPM-2 and TGF beta 1 mRNAs in in vitro or in vivo grown tumor cells. Toremifene causes growth inhibition of estrogen-sensitive breast cancer cells by inducing some cells to undergo apoptosis and by inhibiting other cells from entering mitosis. [1] Toremifene induces a dose-dependent level of adducts that is lower than that observed for TAM. Toremifene significantly enhances endogenous DNA adduct formation. [2] Toremifene affects the cell turnover by inhibiting mitotic activity and modifying abundant spontaneous apoptosis in DMBA-induced rat mammary carcinoma. [3]

In vivo Toremifene, at the highest tested dose, increases the incidence of hepatocellular carcinomas in the DEN-initiated groups to a level one-third that observed with Tamoxifen administration to DEN-initiated rats. Toremifene increases the incidence of hypernephromas in previously DEN-initiated rats. [4] Toremifene results in aneuploidy in 50% of the cells examined and compared with the 85% level induced by Tamoxifen in female Sprague-Dawley rats. [5]

Protocol (from reference)

Solubility (25°C)

In vitro

Chemical Information

Molecular Weight 598.08


CAS No. 89778-27-8
Storage 3 years -20°C powder
2 years -80°C in solvent
Smiles CN(C)CCOC1=CC=C(C=C1)C(=C(CCCl)C2=CC=CC=C2)C3=CC=CC=C3.C(C(=O)O)C(CC(=O)O)(C(=O)O)O

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

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% DMSO % % Tween 80 % ddH2O

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Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Molarity Calculator

Mass Concentration Volume Molecular Weight

Clinical Trial Information

NCT Number Recruitment Interventions Conditions Sponsor/Collaborators Start Date Phases
NCT01214291 Withdrawn Drug: Toremifene Risk of Bone Fracture Occurrences GTx|Ipsen March 2011 Phase 3
NCT00267553 Terminated Drug: Atamestane|Drug: toremifene|Drug: letrozole Breast Neoplasms|Neoplasms Hormone-Dependent Intarcia Therapeutics November 2005 Phase 3
NCT00106691 Completed Drug: Toremifene 20 mg|Drug: Placebo Preneoplastic Conditions|Prostatic Intraepithelial Neoplasia GTx January 2005 Phase 3

(data from, updated on 2022-01-17)

Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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