title: Reasons for Underuse of Adjuvant Chemotherapy in Elderly Patients With Stage III Colon Cancer.
abstract: Undertreatment has been frequently reported in the elderly cancer patient population. For this reason, we aimed to characterize adjuvant chemotherapy (AC) use among elderly patients (EPs) with stage III colon cancer (CC) and to identify potential reasons for undertreatment.
  
  
  
  Patients diagnosed with stage III CC between 2008 and 2010 were included in this review. Multivariate Cox regression models were constructed to evaluate the associations between AC and cancer-specific, disease-free, and overall survival and to determine whether these were modified by age.
  
  
  
  We identified 810 patients: 423 (52%) men, 423 (52%) young patients (YPs), and 603 (74%) received AC. Compared with YPs, EPs were less likely to receive AC (57% vs. 91%; P < .01), particularly 5-fluorouracil and oxaliplatin (FOLFOX) (32% vs. 74%, P < .01). Frequent reasons for nontreatment included age, comorbidities, and perceived minimal benefit from AC. When AC was given, EPs had similar rates of treatment discontinuations (34% vs. 26%; P > .05) and dose reductions (63% vs. 61%; P > .05) as YPs. Reasons for treatment interruptions included side effects, progressive disease, and patient choice. Receipt of either FOLFOX or capecitabine was correlated with improved cancer-specific survival, disease-free survival, and overall survival compared with surgery alone; this effect was not modified by age.
  
  
  
  Elderly patients with stage III CC frequently received either no AC or capecitabine monotherapy because of advanced age and comorbidities. The effect of AC on survival was similar across age groups, with comparable side effects and rates of treatment modifications. AC should not be withheld because of advanced age alone.
authors.affiliation: Division of Medical Oncology, British Columbia Cancer Agency, Vancouver, British Columbia, Canada.
authors.forename: Jenny J
authors.initials: JJ
authors.lastname: Ko
authors.affiliation: Division of Medical Oncology, British Columbia Cancer Agency, Vancouver, British Columbia, Canada.
authors.forename: Hagen F
authors.initials: HF
authors.lastname: Kennecke
authors.affiliation: Division of Medical Oncology, British Columbia Cancer Agency, Vancouver, British Columbia, Canada.
authors.forename: Howard J
authors.initials: HJ
authors.lastname: Lim
authors.affiliation: Division of Medical Oncology, British Columbia Cancer Agency, Vancouver, British Columbia, Canada.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Renouf
authors.affiliation: Division of Medical Oncology, British Columbia Cancer Agency, Vancouver, British Columbia, Canada.
authors.forename: Sharlene
authors.initials: S
authors.lastname: Gill
authors.affiliation: Cancer Control Research, British Columbia Cancer Agency, Vancouver, British Columbia, Canada.
authors.forename: Ryan
authors.initials: R
authors.lastname: Woods
authors.affiliation: Cancer Control Research, British Columbia Cancer Agency, Vancouver, British Columbia, Canada.
authors.forename: Caroline
authors.initials: C
authors.lastname: Speers
authors.affiliation: Cancer Control Research, British Columbia Cancer Agency, Vancouver, British Columbia, Canada. Electronic address: wcheung@bccancer.bc.ca.
authors.forename: Winson Y
authors.initials: WY
authors.lastname: Cheung
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D017024:Chemotherapy, Adjuvant / Q000706:statistics & numerical data*; D003110:Colonic Neoplasms / Q000188:drug therapy*; D005260:Female; D005472:Fluorouracil / Q000627:therapeutic use; D006300:Health Services Misuse; D006801:Humans; D002955:Leucovorin / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D009944:Organoplatinum Compounds / Q000627:therapeutic use; D016016:Proportional Hazards Models
chemical_list: D009944:Organoplatinum Compounds; D002955:Leucovorin; D005472:Fluorouracil
keywords: Advanced age; Comorbidities; Outcomes; Toxicity; Undertreatment