However this trial do not assess the efficacy of oxaliplatin reintroduction

after additional lines of therapy (ie, irinotecan and anti-EGFR or anti-VEGF therapy) and do not analyze the role of a real treatment holiday. The OPTIMOX 2 phase II trial randomised 216 Dasatinib cost patients to receive fluorouracil maintenance between FOLFOX administration versus a treatment holiday. The primary objective was the duration of disease control (DDC), calculated as the sum of the duration of PFS induced with the initial FOLFOX therapy and with the subsequent reintroduction of FOLFOX. But most importantly, after induction of a response, metastases were allowed to progress back to baseline levels before FOLFOX was reintroduced. It was observed that continuing treatment with a maintenance chemotherapy led to a longer PFS, compared with pausing treatment (8.7 months vs AZD0156 order 6.9 months, P = 0.009) but overall survival data were

not available [39, 40]. DDC was almost identical in both arms (12.9 months vs 11.7 months, P not significant and duration of CFI seemed to depend on different clinical prognostic factors including Eastern Cooperative Oncology Group performance status, lactate dehydrogenase and alkaline phosphatase levels, number of metastatic sites. These data showed the possibility of identifying a favourable prognosis group which could benefit from an intermittent strategy. The COIN phase III study randomized 1630 patients with untreated metastatic colorectal cancer to receive either continuous oxaliplatin and fluoropyrimidine combination (arm A), continuous selleckchem chemotherapy plus cetuximab (arm B), or intermittent (arm C) chemotherapy. In arms A and B, treatment continued until development of progressive disease, cumulative toxic effects, or the patient chose to stop. In arm C, patients who had not progressed after six cycles of chemotherapy started a treatment holiday until evidence of disease progression, when the same treatment was restarted. Median survival was 15.8 months in arm A vs 14.4 months in arm C (hazard ratio 1.084, 80% CI 1.008–1.165). In the per-protocol population, more patients on continuous Molecular motor than on intermittent treatment

had grade 3 or worse haematological toxic effects (15% vs 12%), whereas nausea and vomiting were more common on intermittent treatment (2% vs 8%). Other grade 3 or worse toxicities (such as peripheral neuropathy and hand–foot syndrome) were more frequent on continuous than on intermittent treatment [41]. Studies evaluating efficacy and feasibility of biological therapy administered during chemotherapy-free interval The NORDIC VII multicenter phase III trial randomly assigned 571 previously untreated patients to receive the standard Nordic FLOX, cetuximab and FLOX, or cetuximab combined with intermittent FLOX. Median PFS was 7.9, 8.3, and 7.3 months for the three arms, respectively (not significantly different). But OS was almost identical for the three groups (20.4, 19.7, 20.