TIBET

This is a multicenter phase 2 study evaluating the efficacy and safety of trifluridine/tipiracil in women with metastatic or locally advanced breast cancer not amenable to curative treatment by surgery or radiotherapy. This study will be conducted under the sponsorship of BOOG, Amsterdam, NL. Study medication should be started within 3 days after completion of screening and continue until astudy treatment discontinuation criterion is met. Trifluridine/tipiracil will be administered orally BID on days 1 through 5, with the first dose administered in the morning of day 1 of each cycle and the last dose administered in the evening of day 5, followed by a recovery period from day 6 through day 7. Trifluridine/tipiracil will be administered orally BID on days 8 through 12, with the first dose administered in the morning of day 8 of each cycle and the last dose administered in the evening of day 12, followed by a recovery period from day 13 through day 28. Each cycle will be 28 days.