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A randomized controlled study comparing Anastrozole+TS-1 as postoperative chemotherapy in ER positive metastatic breast cancer

A randomized controlled study comparing Anastrozole+TS-1 as postoperative chemotherapy in ER positive metastatic breast cancer - TS-1 and ANA combination therapy in Chugoku and Shikoku trial (TACS trial)

Status
Active, not recruiting
Phases
Phase 2
Study type
Interventional
Source
JPRN
Registry ID
JPRN-UMIN000000795
Enrollment
100
Registered
2007-08-12
Start date
2006-11-01
Completion date
Unknown
Last updated
2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Breast Cancer

Interventions

Group A: Anastrozole (1mg/day) is administratedd orally on days 1-21 until progression or discontimuation of drug (ex. Adverse event et al.)for PgR(+) Breast cancer Group B: Anastrozole (1mg/day) is

Sponsors

Department of Breast and Thyroid Surgery, Kawasaki Medical School
Lead Sponsor

Eligibility

Sex/Gender
Female

Inclusion criteria

Inclusion criteria: 1) Histologically confirmed Breast Cancer 2) Estrogen Respecter positive (10% cut off) 3) Performance Status (ECOG) 0-2 4) Measurable disease 5) Without prior chemotherapy nor use of Anastrozole 6) Adequate organ functions 7) Estimated life expectancy of at least 3 months 8) Postmenopausal 9) Oral intake is possible 10) Written informed consent

Exclusion criteria

Exclusion criteria: 1) concomitant malignancy 2) patient with marked infection 3) patient with marked fever and suspected infection 4) patient with metastasis to CNS 5) complications including ischemic heart disease 6) Active gastrointestinal ulceration 7) Serious Neuropathy 8) Anarmnesis of drug allergy 9) Severe Bone marrow suppression 10) serious renal function disturbance 11) serious liver function disturbance 12) taking other fluoropyrimidine derivatives 13) Under treatment with flucytosine 14) Not suitable for participating in the study for any other reason

Design outcomes

Primary

MeasureTime frame
Response rate

Secondary

MeasureTime frame
Overall survival (OS), Disease free survival (DFS), Adverse events, Examination of the relevance of 5-FU relative factors (thymidylate synthase (TS), dihydropyrimidine dehydrogenase (DPD), thymidine phosphorylase (TP), orotate phosphoribosyl transferase (OPRT) mRNA) and HER2 profile with efficacy, Clinical benefit

Countries

Japan

Contacts

Public ContactKatsuhiro Tanaka

Kawasaki Medical School Department of Breast and Thyroid Surgery

tanakaka@med.kawassaki-m.ac.jp086-462-1111

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026