DISEASE CHARACTERISTICS: Histologically or cytologically confirmed locally advanced or metastatic solid tumors refractory to standard therapy or for which no standard therapy exists (surgery, radiotherapy, and/or chemotherapy) Measurable or evaluable disease by medical photograph, plain x-ray, CT, MRI, palpation, or serum tumor markers at least 2 times upper limit of normal No symptomatic, progressive brain metastases by CT or MRI scan No cerebral edema No leukemia or multiple myeloma

PATIENT CHARACTERISTICS: Age: 18 and over Performance status: SWOG 0-2 Life expectancy: At least 12 weeks Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 9.0 g/dL No coagulation disorders Hepatic: Bilirubin normal AST and ALT no greater than 3 times upper limit of normal (ULN) (no greater than 5 times ULN if liver involvement) PT or INR, and PTT normal Renal: Creatinine no greater than 1.5 mg/dL Cardiovascular: No cardiac conduction abnormalities Other: Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception No active or uncontrolled infection No other concurrent severe disease No known hypersensitivity to SR-45023A analogs No concurrent or recent (within past 6 months) small bowel obstruction, symptoms of small bowel obstruction, or any other gastrointestinal disease impacting absorption of study drug No psychiatric disorders or geographic distance that would prevent compliance

PRIOR CONCURRENT THERAPY: Biologic therapy: No concurrent immunotherapy Chemotherapy: See Disease Characteristics At least 4 weeks since prior chemotherapy (6 weeks since carboplatin, mitomycin, or nitrosoureas) and recovered No prior SR-45023A No other concurrent chemotherapy Endocrine therapy: No concurrent steroid therapy for brain disease No concurrent hormonal cancer therapy (except contraception, hormone replacement therapy, or corticosteroids) Radiotherapy: See Disease Characteristics At least 4 weeks since prior radiotherapy and recovered No concurrent radiotherapy (except symptomatic radiotherapy for pathologic fractures) Surgery: At least 4 weeks since prior surgery and recovered Other: At least 4 weeks since prior investigational agents No other concurrent investigational agents No concurrent anticoagulation therapy (e.g., heparin) except low dose warfarin for central venous catheter patency No concurrent digoxin, beta blockers, or calcium channel blockers No concurrent H2 histamine inhibitors (e.g., ranitidine, famotidine, or cimetidine), proton pump inhibitors (e.g., omeprazole or lansoprazole), or other drugs that might interfere with study drug absorption