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Poster display session

2908 - Impact of Tumor Location on the Efficacy of First-Line anti-EGFR monoclonal antibody plus Chemotherapy in Patients (pts) with Metastatic Colorectal Cancer (mCRC). Retrospective analyses of the randomized MACRO-2 and PLANET trials from TTD Group


09 Sep 2017


Poster display session


Cytotoxic Therapy;  Colon and Rectal Cancer


Manuel Benavides


Annals of Oncology (2017) 28 (suppl_5): v158-v208. 10.1093/annonc/mdx393


M. Benavides1, A. Carrato2, A. Abad3, C. Guillen-Ponce2, P. Garcia-Alfonso4, S. Gil1, M.T. Cano Osuna5, M.J. Safont6, C. Gravalos7, J.L. Manzano-Mozo3, A. Sanchez8, J. Alcaide-Garcia9, R. López10, B. Massuti Sureda11, J. Sastre12, E. Martinez de Castro13, P. Escudero14, M. Méndez-Ureña15, E. Diaz Rubio12, E. Aranda Aguilar5

Author affiliations

  • 1 Medical Oncology, Hospital Universitario Regional y Virgen de la Victoria, 29010 - Malaga/ES
  • 2 Medical Oncology, Hospital Universitario Ramon y Cajal, IRYCIS CIBERONC, 28031 - Madrid/ES
  • 3 Medical Oncology, Catalan Institute of Oncology (ICO Badalona), Hospital Germans Trias i Pujol, 8916 - Badalona/ES
  • 4 Medical Oncology, Hospital Universitario Gregorio Marañón, Madrid/ES
  • 5 Medical Oncology, University Hospital Reina Sofia. CIBERONC Instituto de Salud Carlos III, 14004 - Cordoba/ES
  • 6 Medical Oncology, Hospital General de Valencia, Valencia/ES
  • 7 Medical Oncology, University Hospital 12 De Octubre, 28041 - Madrid/ES
  • 8 Medical Oncology, Hospital Puerta de Hierro Majadahonda, 28220 - Majadahonda/ES
  • 9 Medical Oncology, Hospital Costa del Sol, 29603 - Marbella/ES
  • 10 Medical Oncology Department, Hospital Clínico de Santiago, Santiago de Compostela/ES
  • 11 Medical Oncology, Hospital General Universitario de Alicante, 3010 - Alicante/ES
  • 12 Medical Oncology, Hospital Clinico Universitario San Carlos. CIBERONC Instituto de Salud Carlos III, 28040 - Madrid/ES
  • 13 Medical Oncology, Hospital Universitario Marques de Valdecilla, 39008 - Santander/ES
  • 14 Medical Oncology, Hospital Clinico Universitario Lozano Blesa, 50009 - Zaragoza/ES
  • 15 Medical Oncology, Hospital de Móstoles, Madrid/ES


Abstract 2908


mCRC is a group of heterogeneous diseases rather than a homogeneous one, resulting in clinical and molecular characteristics between right- and left-sided tumors driving to different prognosis.


Pts with KRAS Wild-Type (WT) mCRC treated in 1st-line with EGFR monoclonal antibody inhibitors (EGFRI) plus either FOLFOX or FOLFIRI from two randomized phase II trials (MACRO-2/PLANET) were included in the analysis. Pts were classified according to their primary tumor location as right-sided or left-sided. The main objective was to analyze the effect of primary tumor location on objective response rate (ORR), progression-free survival (PFS) and overall survival (OS). Differential responses in RAS WT pts according to tumor location were also evaluated.


Pts with KRAS WT left-sided primary tumors (N = 209) versus right-sided primary tumors (N = 52) were analyzed. RAS was retrospectively determined in 69% of pts. Both KRAS and RAS WT left-sided had significantly superior ORR, median PFS and median OS compared with right-sided (Table).


Pts with Left-sided primary tumors KRAS or RAS WT mCRC treated with first-line EGFRI plus chemotherapy have significantly improved efficacy outcomes as compared with pts with right-sided primary tumors KRAS or RAS WT mCRCTable:


Right-sided (N = 52)Left-sided (N = 209)Right-sided (N = 33)Left-sided (N = 148)
ORR (confirmed)
Rate, %25.046.933.352.7
OR (95% CI)0.38 (0.19 – 0.75)0.45 (0.20 – 0.99)
Median, m (95% CI)7.209.866.5410.09
(4.21 – 11.14)(9.13 – 11.73)(3.91 – 12.58)(9.43 – 12.06)
HR (95% CI)0.64 (0.44 – 0.92)0.63 (0.40 – 0.99)
Median, m (95% CI)13.5727.7313.5732.79
(8.44 – 26.02)(24.97 – 36.17)(8.41 – 34.23)(26.45 – 39.85)
HR (95% CI)0.47 (0.33 – 0.67)0.44 (0.28 – 0.68)

Clinical trial identification

MACRO-2 trial: NCT01161316, PLANET trial: NCT00885885

Legal entity responsible for the study

Spanish Cooperative Group for the Treatment of Digestive Tumors (TTD)


Amgen SA (PLANET), Merck. S. L. (MACRO-2)


C. Guillen-Ponce: Consultant or advisory role, travel and accommodation: Roche Pharma, Merck Serono. E. Diaz Rubio: Consultant or advisory role, research funding: Bayer, Amgen and Merck. E. Aranda Aguilar: Advisory role: Amgen, Bayer, Celgene, Merck, Roche, Sanofi. All other authors have declared no conflicts of interest.

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