This review shows that a significant proportion of patients in curative-intent clinical trials experience toxicities that result in dose modifications-dose reduction , dose delays or missed doses-despite strict selection criteria and intense monitoring .
Toxicities of systemic cancer therapies are often less frequently observed in clinical trials than in clinical practice , due to the careful selection of patients with fewer comorbidities .
Although guidelines exist for the estimation of chemotherapy dose , clinical factors like age , comorbid illness and extremes of body habitus are not considered in the method of dose calculation , which can result in significant toxicity .
Adjuvant chemotherapy with gemcitabine vs observation in patients undergoing curative-intent resection of pancreatic cancer: a randomized controlled trial.
CONTEXT The role of adjuvant therapy in resectable pancreatic cancer is still uncertain , and no recommended st and ard exists . OBJECTIVE To test the hypothesis that adjuvant chemotherapy with gemcitabine administered after complete resection of pancreatic cancer improves disease-free survival by 6 months or more . DESIGN , SETTING , AND PATIENTS Open , multicenter , r and omized controlled phase 3 trial with stratification for resection , tumor , and node status . Conducted from July 1998 to December 2004 in the outpatient setting at 88 academic and community-based oncology centers in Germany and Austria . A total of 368 patients with gross complete ( R0 or R1 ) resection of pancreatic cancer and no prior radiation or chemotherapy were enrolled into 2 groups . INTERVENTION Patients received adjuvant chemotherapy with 6 cycles of gemcitabine on days 1 , 8 , and 15 every 4 weeks ( n = 179 ) , or observation ( [ control ] n = 175 ) . MAIN OUTCOME MEASURES Primary end point was disease-free survival , and secondary end points were overall survival , toxicity , and quality of life . Survival analysis was based on all eligible patients ( intention-to-treat ) . RESULTS More than 80 % of patients had R0 resection . The median number of chemotherapy cycles in the gemcitabine group was 6 ( range , 0 - 6 ) . Grade 3 or 4 toxicities rarely occurred with no difference in quality of life ( by Spitzer index ) between groups . During median follow-up of 53 months , 133 patients ( 74 % ) in the gemcitabine group and 161 patients ( 92 % ) in the control group developed recurrent disease . Median disease-free survival was 13.4 months in the gemcitabine group ( 95 % confidence interval , 11.4 - 15.3 ) and 6.9 months in the control group ( 95 % confidence interval , 6.1 - 7.8 ; P<.001 , log-rank ) . Estimated disease-free survival at 3 and 5 years was 23.5 % and 16.5 % in the gemcitabine group , and 7.5 % and 5.5 % in the control group , respectively . Subgroup analyses showed that the effect of gemcitabine on disease-free survival was significant in patients with either R0 or R1 resection . There was no difference in overall survival between the gemcitabine group ( median , 22.1 months ; 95 % confidence interval , 18.4 - 25.8 ; estimated survival , 34 % at 3 years and 22.5 % at 5 years ) and the control group ( median , 20.2 months ; 95 % confidence interval , 17 - 23.4 ; estimated survival , 20.5 % at 3 years and 11.5 % at 5 years ; P = .06 , log-rank ) . CONCLUSIONS Postoperative gemcitabine significantly delayed the development of recurrent disease after complete resection of pancreatic cancer compared with observation alone . These results support the use of gemcitabine as adjuvant chemotherapy in resectable carcinoma of the pancreas . TRIAL REGISTRATION is rct n.org Identifier : IS RCT N34802808
This review shows that a significant proportion of patients in curative-intent clinical trials experience toxicities that result in dose modifications-dose reduction , dose delays or missed doses-despite strict selection criteria and intense monitoring .
Toxicities of systemic cancer therapies are often less frequently observed in clinical trials than in clinical practice , due to the careful selection of patients with fewer comorbidities .
Although guidelines exist for the estimation of chemotherapy dose , clinical factors like age , comorbid illness and extremes of body habitus are not considered in the method of dose calculation , which can result in significant toxicity .