Irradiation Modulates the Pharmacokinetics of Anticancer Drugs
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|ClinicalTrials.gov Identifier: NCT01755585|
Recruitment Status : Unknown
Verified January 2014 by Far Eastern Memorial Hospital.
Recruitment status was: Enrolling by invitation
First Posted : December 24, 2012
Last Update Posted : January 22, 2014
Radiation therapy (RT) is used as an effective local treatment modality to inhibit cell proliferation, induce cell death and suppress tumor growth. To improve the treatment outcome, in terms of both locoregional control and survival, the concurrent use of chemotherapy during radiation therapy (CCRT) is now the standard treatment for various malignancies, especially locally advanced cancers. Among the drugs used to enhance RT effect, 5-fluorouracil (5-FU) is one of the most commonly used chemotherapeutic agents of CCRT.
In the past, RT was solely used as a local treatment and its effect was estimated by local effect model. However, growing evidence shows that irradiation has direct DNA damage-dependent effects as well as sending signals to neighboring cells. Recently, we reported that abdominal irradiation could significantly modulate the systemic pharmacokinetics of 5-FU at 0.5 Gy, off-target area in clinical practice, and at 2 Gy, the daily treatment dose for target treatment in an experimental rat model. Additionally, the results from a clinical investigation showed that colorectal cancer patients with lower AUC of 5-FU during adjuvant chemotherapy had lower disease-free survival. Taken together, these lines of evidence support the importance and necessity to search for the mediators responsible for the unexpected effect of local RT on systemic pharmacokinetics of chemotherapeutic agents, such as 5-FU.
In the present study, the investigators investigated whether the phenomena and mechanism of RT-PK is a fact for different anticancer drugs in human.
|Condition or disease|
|Rectal Cancer Cervical Cancer|
|Study Type :||Observational|
|Estimated Enrollment :||40 participants|
|Study Start Date :||July 2011|
|Estimated Primary Completion Date :||December 2015|
Chemotherapy (C/T) is applied in the morning. After 2-4 hrs, radiotherapy (RT) is delivered (according to the clinical practice)
Radiotherapy (RT) is delivered in the morning. After 2-4 hrs, chemotherapy (C/T) is applied (according to the clinical practice).
- all cause mortality [ Time Frame: one year ]
Biospecimen Retention: Samples With DNA