Do drugs that offer PFS or modest OS benefits improve quality of life in patients with advanced cancer?
223 Background: Patients value quality of life (QoL) not just quantity of life but QoL data from measures in advanced disease are sparse for drugs with only progression-free survival (PFS) or modest overall survival (OS) benefits. We examined if stabilisation of metastatic disease and/or disease symptom burden were worth treatment side effects in the AVALPROFS study. Methods: Patients with metastatic cancers starting drugs with PFS or modest OS benefits were interviewed at baseline and following 6 weeks of treatment. Further interviews were conducted at progression or if treatment was stopped for toxicity. Interviews comprised trade-off type assessments exploring worthwhileness of treatment compared with side effects.Patients completed FACT tumor and treatment specific questionnaires monthly for 6 months. Global QoL was measured across time and between patients who died or progressed on study (A), remained on study (B) or withdrew from study due to toxicity (C). Results: 90/120 (75%) eligible patients participated. 31/90 (21%) patients died or progressed within 6 months of study entry (Group A). 12 patients withdrew due to toxicity (Group B) and 47 patients stayed on treatment for 6 months (Group C). At first interview 43/90 (48%) patients had started treatment and by 6 weeks (66/69, 96%) were experiencing side effects. At both interviews patients were significantly less inclined to feel that benefits of cancer control were worthwhile as the possible side effect severity increased (X2=75.6004. p< 0.00001; 50.6896 p< 0.00001 respectively). There was an effect of patient group on general QoL (F=4.978; p = 0.007) but no group by time interaction (F=0.419; p = 0.888). Also, a significant overall group effect (A vs. C) for emotional (F=6.583, p = 0.011) and functional well-being (F=5.138, p = 0.024). More patients in Group C had stable/improved QoL over time. Conclusions: Over 6 months, QoL was stable in those patients receiving drugs with PFS only or minimal OS who could tolerate treatment side effects. As severity of side effects increased, patients were less likely to feel that treatment was worthwhile but a proportion were still willing to accept these for a relatively short increase in the time drugs controlled the cancer.