TITLE

A weighted zero-inflated Poisson model for estimation of recurrence of adenomas

AUTHOR(S)
Chiu-Hsieh Hsu
PUB. DATE
April 2007
SOURCE
Statistical Methods in Medical Research;Apr2007, Vol. 16 Issue 2, p155
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this article, a weighted zero-inflated Poisson (W-ZIP) approach to modelling colorectal adenoma data is used in which the number of recurrent adenomas is subject to measurement error and some participants might have their follow-up colonoscopy conducted before the end of trial. The weights are used to adjust for varying follow-up and obtained from a nonparametric survival function derived from the lengths of follow-up. It is shown that logistic regression (LR) and survival analysis tend to underestimate recurrence rate due to measurement error on the status of recurrence. A simulation study shows that the W-ZIP model is robust to the assumption of the underlying distribution of time-to-recurrence and is less affected by misclassification at follow-up colonoscopy when compared with LR and survival analysis approaches. The method described here is illustrated with an example from a colon cancer study.
ACCESSION #
25219070

 

Related Articles

  • Clinical characteristics of synchronous colorectal cancers in Japan. Takaharu Kato; Sergio Alonso; Yuta Muto; Hiroshi Noda; Yasuyuki Miyakura; Koichi Suzuki; Shingo Tsujinaka; Masaaki Saito; Manuel Perucho; Toshiki Rikiyama // World Journal of Surgical Oncology;10/24/2016, Vol. 14, p1 

    Background: Incidence and clinical characteristics of synchronous colorectal cancer (sCRC) patients significantly vary among studies, likely due to differences in surveillance methodology. If remain undetected, sCRC can progress to more advanced stages seriously aggravating patient prognosis. We...

  • Characteristics and Survival of Interval and Sporadic Colorectal Cancer Patients: A Nationwide Population-Based Cohort Study. Erichsen, Rune; Baron, John A; Stoffel, Elena M; Laurberg, Søren; Sandler, Robert S; Sørensen, Henrik Toft // American Journal of Gastroenterology;Aug2013, Vol. 108 Issue 8, p1332 

    OBJECTIVES:Colorectal cancers (CRCs) diagnosed relatively soon after a colonoscopy are referred to as interval CRCs. It is not clear whether interval CRCs arise from prevalent lesions missed at colonoscopy or represent specific aggressive biology leading to poor survival.METHODS:Using Danish...

  • Gradient Estimates for Solutions of the Lamé System with Partially Infinite Coefficients. Bao, JiGuang; Li, HaiGang; Li, YanYan // Archive for Rational Mechanics & Analysis;Jan2015, Vol. 215 Issue 1, p307 

    We establish upper bounds on the blow up rate of the gradients of solutions of the Lamé system with partially infinite coefficients in dimension two as the distance between the surfaces of discontinuity of the coefficients of the system tends to zero.

  • Survival Analysis of Colorectal Cancer Patients with Tumor Recurrence Using Global Score Test Methodology. Zain, Zakiyah; Aziz, Nazrina; Ahmad, Yuhaniz; Azwan, Zairul; Raduan, Farhana; Sagap, Ismail // AIP Conference Proceedings;2014, Vol. 1635, p956 

    Colorectal cancer is the third and the second most common cancer worldwide in men and women respectively, and the second in Malaysia for both genders. Surgery, chemotherapy and radiotherapy are among the options available for treatment of patients with colorectal cancer. In clinical trials, the...

  • Score Tests for Semiparametric Zero-inflated Poisson Models. Li, Chin-Shang // International Journal of Statistics & Probability;Nov2012, Vol. 1 Issue 2, p1 

    Count data sets often produce many zeros. It is sometimes potentially questionable to use a linear predictor to model the effect of a continuous covariate of interest in zero-inflated count data. To relax the restriction, Li (2011) proposed a semiparametric zero-inflated Poisson (ZIP) regression...

  • Risk factor stratification after simultaneous liver and colorectal resection for synchronous colorectal metastasis. Won-Suk Lee; Min Kim; Seong Yun; Ho-Kyung Chun; Woo Lee; Sung-Joo Kim; Seong-Ho Choi; Jin-Seok Heo; Jae Joh; Yong Kim // Langenbeck's Archives of Surgery;Feb2008, Vol. 393 Issue 1, p13 

    This study was conducted to devise a prognostic model for patients undergoing simultaneous liver and colorectal resection. A retrospective analysis was performed on 138 colorectal patients who underwent simultaneous liver and colorectal resection between September 1994 and September 2005. The...

  • Therapeutic efficacy of combined intraoperative ablation and resection for colorectal liver metastases: an international, multi-institutional analysis. Jong, Mechteld; Vledder, Mark; Ribero, Dario; Hubert, Catherine; Gigot, Jean-François; Choti, Michael; Schulick, Richard; Capussotti, Lorenzo; Dejong, Cornelis; Pawlik, Timothy; de Jong, Mechteld C; van Vledder, Mark G; Gigot, Jean-François; Choti, Michael A; Schulick, Richard D; Dejong, Cornelis H; Pawlik, Timothy M // Journal of Gastrointestinal Surgery;Feb2011, Vol. 15 Issue 2, p336 

    Background: Only 10-25% of patients presenting with colorectal liver metastases (CRLM) are amenable to hepatic resection. By combining resection and ablation, the number of patients eligible for surgery can be expanded. We sought to determine the efficacy of combined resection and...

  • The expression and prognostic impact of CXC-chemokines in stage II and III colorectal cancer epithelial and stromal tissue. Oladipo, O.; Conlon, S.; O'Grady, A.; Purcell, C.; Wilson, C.; Maxwell, P. J.; Johnston, P. G.; Stevenson, M.; Kay, E. W.; Wilson, R. H.; Waugh, D. J. J. // British Journal of Cancer;2/1/2011, Vol. 104 Issue 3, p480 

    Background:The CXC-chemokine expression is linked with colorectal cancer (CRC) progression but their significance in resected CRC is unclear. We explored the prognostic impact of such expression in stage II and III CRC.Methods:Tissue microarrays were constructed from stage II and III CRC...

  • Do metastatic colorectal cancer patients who present with late relapse after curative surgery have a better survival? Broadbridge, V T; Karapetis, C S; Beeke, C; Woodman, R J; Padbury, R; Maddern, G; Kim, S W; Roder, D; Hakendorf, P; Price, T J // British Journal of Cancer;9/3/2013, Vol. 109 Issue 5, p1338 

    Background:Patients who relapse after potentially curative surgery for colorectal cancer tend to relapse within 5 years. There is, however, a group of patients who relapse beyond 5 years after resection and this late relapsing group may have a different behaviour and prognosis.Methods:We...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics