The purpose of this study is to evaluate the safety and tolerability of oral SKI-606 (100, 200, 300 or 400 mg) administered on a daily schedule to subjects with advanced malignant solid tumors and to define a maximum tolerated dose (MTD) in this subject population. This study will also obtain preliminary information on the pharmacokinetics and antitumor activity of orally administered SKI-606 in subjects with advanced malignant solid tumors

Inclusion Criteria:

1. Advanced or recurrent solid malignancy confirmed histologically or cytologically for which no effective therapy is available
2. Recovery from acute adverse effects of prior therapies to £ Grade 1 (excluding alopecia)
3. Eastern Cooperative Oncology Group (ECOG) performance status of 0 - 1
4. Adequate hepatic, renal, and bone marrow function
5. Age 20 to 74 years
6. Willingness of male and female subjects, who are not surgically sterile or postmenopausal, to use reliable methods of birth control for the duration of the study and for 6 months and 30 days after the last dose of test article for male and female, respectively
7. Life expectancy of at least 12 weeks

Exclusion Criteria:

1. Use of any systemic antitumor agents or any investigational agent within 28 days before the enrollment (42 days if the previous chemotherapy included nitrosoureas or mitomycin C)

2. Ongoing clinical requirement for administration of a strong inhibitor of CYP3A4

3. Prior exposure to SKI-606 or any other Src-kinase inhibitor

4. Major surgery or radiotherapy within 2 weeks before the enrollment (recovery from previous surgery should be complete before day 1)

5. Subjects unable or unwilling to swallow SKI-606 capsules

6. Active central nervous system (CNS) metastases, as indicated by clinical symptoms, cerebral edema, requirement for corticosteroids and/or progressive growth

7. Recent or ongoing clinically-significant gastrointestinal disorder

8. Pregnant or breastfeeding women

9. Subjects who meet the following criteria:

   • Evidence of serious active infection, significant medical or psychiatric illness
   • History of unexplained syncope or known ventricular arrythmia
   • Known seropositivity to HIV, or current or chronic Hepatitis B or Hepatitis hepatitis C
   • Hypokalemia
   • Unstable concurrent medical conditions
   • Any other condition that, in the investigator's judgment, make the subject inappropriate for this study the subject inappropriate for this study