A First-in-human Study to Evaluate the Safety, Tolerability and Pharmacokinetics of DS-6051b

The Dose Escalation part (Part 1) of this study will evaluate safety and tolerability, and
determine the tentative RP2D. Plasma exposure of DS-6051a and the exposure - QT interval
prolongation relationship will also be assessed. Approximately 30 subjects with advanced
solid tumors harboring ROS1 or NTRK1, NTRK2, or NTRK3 rearrangement, neuroendocrine
carcinoma, or with advanced solid tumors and tumor-induced pain will be enrolled.

The Food Effect (FE) part of this study is to determine the effect of food on the PK of
DS-6051a following administration of a single oral dose of DS-6051b. The safety and
tolerability of DS-6051b administered with or without food will also be assessed.

After the safety profile of DS-6051b is adequately evaluated, the Dose Expansion part (Part
2) will be initiated to further assess the safety and tolerability, and preliminarily
evaluate the efficacy of DS-6051b at the tentative RP2D. Approximately 40 cancer subjects
carrying a ROS1 or NTRK1, NTRK2, or NTRK3 rearrangement will be enrolled.

Inclusion Criteria:

1. Histologically or cytologically confirmed diagnosis of advanced solid tumors that have
relapsed from or are refractory to standard treatment or for which no standard
treatment is available

2. Part 1 Dose Escalation subjects must meet 1 of the following criteria:

- Solid tumors with documented ROS1, NTRK1, NTRK2, or NTRK3 rearrangement

- Neuroendocrine tumors

- Solid tumors with tumor-induced pain

3. Part 2 Dose Expansion subjects must meet 1 of the following criteria:

- NSCLC with documented ROS1, NTRK1, NTRK2, or NTRK3 rearrangement

- k-RAS wild-type CRC with documented NTRK1, NTRK2, or NTRK3 rearrangement

- Other solid tumors with documented ROS1, NTRK1, NTRK2, or NTRK3 rearrangement

- Pulmonary LCNEC;

4. Male or female ≥18 years of age

5. Eastern Cooperative Oncology Group performance status 0 to 1

6. Adequate organ function

7. Adequate blood clotting function

8. Women of childbearing potential must have a negative pregnancy test

9. Willingness to provide archival tumor samples

10. Other inclusion criteria may apply

Exclusion Criteria:

1. Hematological malignancies

2. Known positive HIV infection, or active hepatitis B or C infection

3. Comorbidity that would interfere with therapy

4. Receipt of an allogeneic bone marrow or allogeneic stem cell transplant

5. Concomitant medical condition that would increase the risk of toxicity, in the opinion
of the Investigator or Sponsor

6. History of myocardial infarction and unstable angina within 6 months before study drug
treatment; symptomatic congestive heart failure (Congestive Heart Failure New York
Heart Association Class III or IV); congenital long QT syndrome; or ventricular
arrhythmias defined as grade ≥2 according to NCI CTCAE, v4

7. Clinically active primary central nervous system tumors or brain metastases with the
exception of subjects with glioblastoma multiform that carry ROS1 rearrangement

8. Unresolved toxicities from previous anticancer therapy

9. Systemic treatment with anticancer therapy within 3 weeks before study drug treatment

10. Therapeutic radiation therapy or major surgery within 4 weeks before study drug
treatment or palliative radiation therapy within 2 weeks before study drug treatment

11. Participation in a therapeutic clinical study within 3 weeks for biological
treatments, and within 2 weeks or 5 half-lives, whichever is longer, for small
molecule agents, before study drug treatment

12. Concomitant treatment with strong inhibitors or inducers of CYP3A4 and P-glycoprotein

13. Clinically significant malabsorption syndrome or other gastrointestinal disease that
would impact drug absorption

14. QTcF values higher than 450 ms at screening

15. Breastfeeding

16. Other exclusion criteria may apply