Absorption and Excretion of Oral Docetaxel

Inclusion criteria

1. Histological or cytological proof of cancer.
2. Patients who might benefit from treatment with docetaxel, e.g. advanced breast, gastric, esophagus, bladder, ovarian cancer and non-small cell lung cancer, head and neck cancer, prostate cancer and carcinoma of unknown primary site.
3. Age ≥ 18 years.
4. Able and willing to give written informed consent.
5. WHO performance status of 0, 1 or 2.
6. Able and willing to undergo blood sampling, urine and faeces sampling for PK.
7. Able and willing to comply with the study protocol for the duration of the study.
8. Life expectancy ≥ 3 months.
9. Evaluable disease
10. Minimal acceptable safety laboratory values:

    1. ANC of ≥ 1.5 x 109/L
    2. Platelet count of ≥ 100 x 109/L
    3. Hepatic function as defined by serum bilirubine ≤ 1.5 x ULN, ASAT and ALAT ≤ 2.5 x ULN (or ≤ 5 ULN in case of liver metastases)
    4. Renal function as defined by serum creatinine ≤ 1.5 x ULN or creatinine clearance ≥ 50 ml/min (by Cockcroft-Gault formula)
11. Negative pregnancy test (urine/serum) for female patients with childbearing potential.
12. No radio- or chemotherapy within 4 weeks prior to the first dose of ModraDoc006/r (palliative radiation on a limited field for pain control is allowed)
13. Able and willing to swallow oral medication.

Exclusion criteria

1. Patients with known alcoholism, drug addiction and/or psychotic disorders in the history that are not suitable for adequate follow up.
2. Women who are pregnant or breast-feeding.
3. Unreliable contraceptive methods. Both men and women enrolled in this trial must agree to use a reliable contraceptive method throughout the study (adequate contraceptive methods are described in section 8.8.3 and include condom, sterilization and other barrier contraceptive measures preferably in combination with condoms).
4. Concomitant use of MDR and CYP3A modulating drugs, including but not limited to Ca2+-entry blockers (verapamil, dihydropyridines), cyclosporine, quinidine, quinine, tamoxifen, megestrol and grapefruit juice, concomitant use of HIV medications; other protease inhibitors, (non) nucleoside analogs, St. John's wort or macrolide antibiotics as erythromycin and clarithromycin. A washout period is established for all relevant drugs (see appendix VII).
5. Uncontrolled infectious disease or known HIV-1 or HIV-2 type infection.
6. Unresolved (\>grade 1) toxicities of previous chemotherapy, excluding alopecia.
7. Bowel obstructions, motility disorders or previously performed extended abdominal surgery that may influence the absorption of drugs.
8. Neurologic disease that may render a patient at increased risk for peripheral or central neurotoxicity.
9. Pre-existing neuropathy greater than CTC grade 1.
10. Patients with symptomatic brain metastases or with leptomeningeal metastases. Patients with brain metastases are allowed if they received adequate treatment, are asymptomatic in the absence of corticosteroid therapy and anticonvulsant therapy for at least 6 weeks. Radiotherapy for brain metastasis must have been completed at least 6 weeks prior to start of study treatment. Brain metastasis must be stable with verification by imaging (e.g. brain MRI or CT completed at screening).
11. Evidence of any other disease, neurological or metabolic dysfunction, physical examination finding or laboratory finding giving reasonable suspicion of a disease or condition that contraindicates the use of an investigational drug or puts the patient at high risk for treatment-related complications.