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Relationships between tumour response and primary tumour location, and predictors of long-term survival, in patients with RAS wild-type metastatic colorectal cancer receiving first-line panitumumab therapy: retrospective analyses of the PRIME and PEAK clinical trials. Br J Cancer 2018; 119:303-312. [PMID: 30013091 PMCID: PMC6068172 DOI: 10.1038/s41416-018-0165-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 05/24/2018] [Accepted: 06/07/2018] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Data from two trials of panitumumab in metastatic colorectal cancer (mCRC) were retrospectively analysed to investigate the effects of primary tumour location on early-tumour shrinkage (ETS) and depth of response (DpR), and identify factors predicting long-term survival. METHODS Patients with RAS wild-type mCRC from PRIME (NCT00364013) and PEAK (NCT00819780) were included. ETS was defined as a ≥30% reduction in the sum-of-the-longest-diameters of measurable target lesions at eight weeks. DpR was the maximum percentage change from baseline to nadir in patients with shrinkage. Univariate and multivariate logistic analyses of short- versus long-term survivor data were performed. RESULTS A total of 435/559 (78%) patients had left-sided disease. Of these, a higher proportion of patients treated with panitumumab versus comparator achieved ETS (PRIME: 62% vs. 36%; PEAK: 58% vs. 41%); median DpR was also higher with panitumumab (PRIME: 59% vs. 49%; PEAK: 70% vs. 48%). In pooled analyses of the studies, more patients with right-sided disease achieved ETS if treated with panitumumab than comparator (39% vs. 29%). Panitumumab treatment consistently predicted long-term survival. CONCLUSIONS First-line panitumumab was associated with improved ETS and DpR vs. comparator in patients with left-sided mCRC. ETS may identify a subgroup of patients with right-sided disease who might respond to panitumumab.
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Yang L, He W, Yang Q, Kong P, Xie Q, Jiang C, Zhang B, Xia LP. Combination of primary tumor location and mismatch repair status guides adjuvant chemotherapy in stage II colon cancer. Oncotarget 2017; 8:99136-99149. [PMID: 29228759 PMCID: PMC5716799 DOI: 10.18632/oncotarget.21839] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 09/22/2017] [Indexed: 01/05/2023] Open
Abstract
Background Current opinions on the benefits of adjuvant chemotherapy for stage II colon cancer are divided and reformative election of these patients is required. We examined whether the primary tumor location based on mismatch repair status and other risk factors could better inform the current guideline. Materials and Methods A total of 673 consecutive patients with stage II colon cancer were included in the analysis. Differences in the common clinicopathological factors between left-sided colon cancer and right-sided colon cancer were analyzed using Fisher's exact analysis. Kaplan-Meier analysis was used to distinguish the survival difference by primary tumor location and/or MMR status. Results RCC had a shorter overall survival (P = 0.001) and Disease-free survival (P = 0.050) than LCC but was associated with survival benefit from adjuvant chemotherapy (P = 0.001 and P = 0.011 for OS and DFS, respectively). Mismatch repair-proficient had a shorter OS (P = 0.036) and disease free survival (P = 0.034) than mismatch-repair deficient but chemotherapy improved the OS (P = 0.007). When the primary tumor location and MMR status were combined, the PMMR/RCC was the only subgroup that could benefit from adjuvant chemotherapy (P < 0.001 and P = 0.002 for OS and DFS, respectively). Other tumors such as DMMR/RCC, DMMR/LCC, and PMMR/LCC did not benefit. Conclusions The observed survival benefits in PMMR/RCC patients treated with adjuvant chemotherapy will allow better selection of patients for chemotherapy who are in stage II.
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Affiliation(s)
- Lin Yang
- Sun Yat-Sen University Cancer Center, Guangzhou, China.,State Key Laboratory of Oncology in Southern China, Guangzhou, China.,Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Wenzhuo He
- Sun Yat-Sen University Cancer Center, Guangzhou, China.,State Key Laboratory of Oncology in Southern China, Guangzhou, China.,Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Qiong Yang
- Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Pengfei Kong
- Sun Yat-Sen University Cancer Center, Guangzhou, China.,State Key Laboratory of Oncology in Southern China, Guangzhou, China.,Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Qiankun Xie
- Sun Yat-Sen University Cancer Center, Guangzhou, China.,State Key Laboratory of Oncology in Southern China, Guangzhou, China.,Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Chang Jiang
- Sun Yat-Sen University Cancer Center, Guangzhou, China.,State Key Laboratory of Oncology in Southern China, Guangzhou, China.,Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Bei Zhang
- Sun Yat-Sen University Cancer Center, Guangzhou, China.,State Key Laboratory of Oncology in Southern China, Guangzhou, China.,Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Liang Ping Xia
- Sun Yat-Sen University Cancer Center, Guangzhou, China.,State Key Laboratory of Oncology in Southern China, Guangzhou, China.,Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
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