title: Side effects during chemotherapy predict tumour response in advanced colorectal cancer.
abstract: To investigate whether a relationship between chemotherapy-associated adverse events and treatment efficacy exists, we have analysed the toxicity, objective response and survival data of 303 patients with advanced colorectal cancer. Patients were divided into two groups: the first with beneficial effect (I, n = 245), and the second with progressive disease (II, n = 58). Differences in terms of incidence rates, type and severity of ad verse events were analysed with univariate and multivariate models. The median number of side effects in group I was 6 vs 4 in group II (OR=1.342; P= 0.0001). An inverse correlation between disease control and treatment tolerance was confirmed when side effects were analysed according to severity and type of treatment-associated toxicities (haematological: P = 0.0005 vs nonhaematological P = 0.0001). When median survival was analysed according to the number of adverse events, it was 10 (95% CI, 3-7), 16 (14-18), and 18 (16-20) months in case of 0-1, 2-5, and > or =6 adverse events, respectively (P = 0.01). In conclusion, the results of this analysis suggest that occurrence of side effects during chemotherapy in advanced colorectal cancer is an independent and reliable prognostic indicator for response and survival.
authors.affiliation: Division of Clinical Oncology, Department of Internal Medicine I, University Hospital, Vienna, Austria. birgit.schuell@meduniwien.ac.at
authors.forename: B
authors.initials: B
authors.lastname: Schuell
authors.forename: T
authors.initials: T
authors.lastname: Gruenberger
authors.forename: G V
authors.initials: GV
authors.lastname: Kornek
authors.forename: N
authors.initials: N
authors.lastname: Dworan
authors.forename: D
authors.initials: D
authors.lastname: Depisch
authors.forename: F
authors.initials: F
authors.lastname: Lang
authors.forename: B
authors.initials: B
authors.lastname: Schneeweiss
authors.forename: W
authors.initials: W
authors.lastname: Scheithauer
mesh_terms: D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000009:adverse effects*; D015179:Colorectal Neoplasms / Q000188:drug therapy* / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011446:Prospective Studies; D016019:Survival Analysis; D016896:Treatment Outcome