Who gets adjuvant treatment for stage II and III rectal cancer? Insight from surveillance, epidemiology, and end results--Medicare.
OBJECTIVE
To examine the relationship between patient characteristics and the use of adjuvant pelvic radiation with and without chemotherapy among patients aged 65 years and older with stage II and III rectal cancer.


METHODS
A retrospective cohort study using the Surveillance, Epidemiology, and End Results-Medicare linked database identified 1,411 patients aged 65 and older with resected stage II and III rectal cancers diagnosed between 1992 and 1996. From claims submitted to Medicare, we measured the use of pelvic radiation therapy with or without chemotherapy and pre- or postoperatively.


RESULTS
Fifty-seven percent of patients received radiation, 42% received chemotherapy and radiation, and 7% had treatment delivered preoperatively. Age was the strongest determinant of treatment: 73% of patients aged 65 to 69, 66% aged 70 to 75, 52% aged 75 to 79, 39% aged 80 to 84, and 21% aged 85 to 89 received radiation. The age trend remained strong after adjusting for other factors that predict receipt of treatment and after exclusion of patients with any evident comorbidity (P <.001). Patients were more likely to receive radiation treatment if they had an abdominal perineal resection, stage III disease, or a T4 tumor.


CONCLUSIONS
Because pelvic recurrences are a substantial cause of morbidity, further efforts are needed to ensure that elderly patients have the opportunity to make informed decisions regarding adjuvant treatment.
Schrag
D
D
Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA. schragd@mskcc.org
Gelfand
S E
SE
Bach
P B
PB
Guillem
J
J
Minsky
B D
BD
Begg
C B
CB
D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D000970:Antineoplastic Agents / Q000627:therapeutic use; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D006278:Medicare / Q000706:statistics & numerical data*; D018579:Patient Selection; D011182:Postoperative Care; D010818:Practice Patterns, Physicians'; D011300:Preoperative Care; D018714:Radiotherapy, Adjuvant; D012004:Rectal Neoplasms / Q000473:pathology / Q000532:radiotherapy* / Q000628:therapy; D012044:Regression Analysis; D012189:Retrospective Studies; D014481:United States / Q000453:epidemiology
D000970:Antineoplastic Agents