An Open-label Phase I Study of Orally Available Novel Small-molecule Fibroblast Growth Factor Receptors (FGFR) 1,2,3 and 4 Inhibitor, ASP5878 at Single and Multiple Doses in Patients With Solid Tumors

This study consists of two parts. In the dose-escalation part, ASP5878 (orally available
novel small-molecule FGFR 1,2,3 and 4 inhibitor, multiple dosing once-a-day (q.d.), multiple
dosing twice-a-day (b.i.d.) or 5-day on/2-day off dosing twice-a-day (5on-2off)) is
administered to participants with solid tumors in an increasing dose manner, and the
tolerability, safety, pharmacokinetics (PK), pharmacodynamics (PD) and efficacy of ASP5878
are evaluated in these participants. Cycle 0 consists of 3 days and Cycle 1 and subsequent
cycles consist of 28 days each in the dose-escalation part. In the expansion part, 16mg
twice-a-day 5-day on/2-day off dose of ASP5878 (5on-2off) is administered to participants
with solid tumors and safety, PK, PD and efficacy of ASP5878 are evaluated. The expansion
part starts from Cycle 1 and each cycle consists of 28 days.

Inclusion Criteria:

- Histologically or cytologically confirmed solid tumor.

- Participant must meet at least one of the following criteria in the judgment of the
investigator or sub-investigator:

- Disease progression despite standard therapies

- Progressive disease without any standard therapies established

- Standard therapies are considered intolerable

- Eastern Cooperative Oncology Group performance status 0 or 1.

- Predicted life expectancy ≥ 12 weeks in the judgment of the investigator or
sub-investigator.

Exclusion Criteria:

- Participant with ≥ Grade 2 (CTCAE v 4.0-JCOG) persistent symptoms and objective
findings due to the toxicity attributable to prior treatment with antitumor effect
(except alopecia).

- Participant who received a prior treatment intended for antitumor effect (medication,
surgery, radiotherapy, etc.) within 4 weeks prior to the planned first day of study
drug dosing (or participant who received mitomycin C or Nitrosourea within 6 weeks
prior to the planned first day of study drug dosing).

- A major surgical procedure within 4 weeks prior to the planned first day of study drug
dosing or a surgical procedure is planned during the course of the study.

- Participant who were treated with other investigational drug or medical device within
4 weeks prior to the planned first day of study drug dosing.

- Participant who has a history of organ transplantation.

- Participant with a brain metastasis with symptoms or requiring treatment.