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Low-dose Capecitabine Adjuvant Chemotherapy for Elderly Patients With Stage II/III Colorectal Cancer

ABSTRACT: Approximately half of colorectal cancer (CRC) patients were first diagnosed after 70 years old. However, compared with younger patients, elderly patients were often undertreated in chemotherapy due to their impaired tolerance. Recently, there have been great controversy on adjuvant chemotherapy strategy for stage II/III CRC patients. As an oral fluoropyrimidine, capecitabine has been demonstrated to be equivalent to i.v. 5-Fu/leucovorin regimen in stage III CRC patients. In light of fewer adverse effects and better flexibility, capecitabine was regarded as an ideal alternative for elderly CRC patients, but the optimal dosage for stage II/III elderly CRC patients still remains inconclusive. Our trial expected to prospectively randomized 710 postoperative stage II/III elderly CRC patients (between 70 and 90 years of age) to adjuvant mono-chemotherapy with a standard dose of capecitabine (2500 mg/m2/day) or a reduced dose (2000 mg/m2/day). This is a non-inferiority phase 3 trial with a primary endpoint of 3-year disease free survival (DFS), and other outcomes include 3-year overall survival(OS), completion rate, toxic and adverse effects and quality of life(Qol). By this trial, we aimed to achieve more precise evidence on the individualized adjuvant chemotherapy strategy for stage II/III elderly CRC patients.

DISEASE(S): Colorectal Cancer,Colorectal Neoplasms

PROVIDER: 2180247 | ecrin-mdr-crc |

REPOSITORIES: ECRIN MDR

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Project description:Claret2009 - Predicting phase III overall survival in colorectal cancer This model is described in the article: Model-based prediction of phase III overall survival in colorectal cancer on the basis of phase II tumor dynamics. Claret L, Girard P, Hoff PM, Van Cutsem E, Zuideveld KP, Jorga K, Fagerberg J, Bruno R. J. Clin. Oncol. 2009 Sep; 27(25): 4103-4108 Abstract: PURPOSE: We developed a drug-disease simulation model to predict antitumor response and overall survival in phase III studies from longitudinal tumor size data in phase II trials. METHODS: We developed a longitudinal exposure-response tumor-growth inhibition (TGI) model of drug effect (and resistance) using phase II data of capecitabine (n = 34) and historical phase III data of fluorouracil (FU; n = 252) in colorectal cancer (CRC); and we developed a parametric survival model that related change in tumor size and patient characteristics to survival time using historical phase III data (n = 245). The models were validated in simulation of antitumor response and survival in an independent phase III study (n = 1,000 replicates) of capecitabine versus FU in CRC. RESULTS: The TGI model provided a good fit of longitudinal tumor size data. A lognormal distribution best described the survival time, and baseline tumor size and change in tumor size from baseline at week 7 were predictors (P < .00001). Predicted change of tumor size and survival time distributions in the phase III study for both capecitabine and FU were consistent with observed values, for example, 431 days (90% prediction interval, 362 to 514 days) versus 401 days observed for survival in the capecitabine arm. A modest survival improvement of 39 days (90% prediction interval, -21 to 110 days) versus 35 days observed was predicted for capecitabine. CONCLUSION: The modeling framework successfully predicted survival in a phase III trial on the basis of capecitabine phase II data in CRC. It is a useful tool to support end-of-phase II decisions and design of phase III studies. This model is hosted on BioModels Database and identified by: MODEL1708310001. To cite BioModels Database, please use: BioModels Database: An enhanced, curated and annotated resource for published quantitative kinetic models. To the extent possible under law, all copyright and related or neighbouring rights to this encoded model have been dedicated to the public domain worldwide. Please refer to CC0 Public Domain Dedication for more information.

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Low-dose Capecitabine Adjuvant Chemotherapy for Elderly Patients With Stage II/III Colorectal Cancer

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