In China, we don’t often take TS-1. We take a drug called capecitabine. It's similar to TS-1. There are two methods. One method is to take it for half a year, and the other is to take it for a year. It seems that you have already taken it. In this case, taking this medication will help you reduce the rate of recurrence. It's better than not taking it. 

Then you should do a regular check-up and have a review every three months. For triple-negative breast cancer, the most common recurrence is within one year. If there is no recurrence in one year, the recurrence rate in the second year will be reduced by 50%. If there is no recurrence in two years. It's actually safer than other tumors. The recurrence rate will be very low after 5 years.