[Initial Evaluation of the Efficacy and Safety of Tablets Containing Trifluridine and Tipiracil Hydrochloride--Safety Measures Devised by a Multidisciplinary Team Including a Pharmaceutical Outpatient Clinic].

In May 2014, tablets containing both trifluridine and tipiracil hydrochloride (Lonsurf® tablets) were launched in Japan ahead of other countries, for the treatment of advanced/relapsed unresectable colorectal cancer. The benefits of these tablets in terms of a new therapeutic option have been demonstrated. However, the manufacturer has requested healthcare professionals to help develop safety measures for the appropriate and safe use of the tablets. In this study, we evaluated the efficacy and safety of the tablets in 16 patients who received the tablets at our hospital. Among the 4 evaluable patients, none achieved a complete or partial response. One patient (25.0%) had stable disease according to the Response Evaluation Criteria in Solid Tumors (RECIST) Guidelines outlined in the General Rules of the Study of Colorectal Cancer (The 8th Edition). Lonsurf® is considered to be a third-line (or later) treatment. Among the 16 cases studied, Lonsurf® was used as a third-, fourth-, and fifth-line treatment in 9, 6, and 1 cases, respectively. Therefore, Grade 3 or worse toxicities were a potential concern. Despite a high incidence of Grade 3 or worse neutropenia (7 of the 16 patients [43.8%]), none of the patients were hospitalized due to neutropenia or other treatment-related adverse events. Pharmacists have made 126 proposals to physicians regarding the use of Lonsurf®, 121 (96.0%) of which have been adopted. All of the adverse reactions experienced by our patients were resolved after supportive therapy.