Treatment Patterns and Outcomes Among Elderly Glioblastoma Patients at KFMC, Riyadh.

Abstract IntroductionManagement of elderly patients with cancer is a controversial scenario and needs careful assessment and selection for aggressive radical treatment and chemotherapy protocols versus short-course radiotherapy without chemotherapy. Of note, definitions of the elderly vary in the glioblastoma (GBM) literature, with most of the randomized trials including patients aged 60, 65, or 70 years or older.Aim of the workTo evaluate treatment patterns and outcome among elderly GBM patients treated in KFMC, Riyadh. The primary endpoint is overall survival (OS) and the Secondary endpoint is progression-free survival (PFS) in relation to different treatment options and prognostic factors. MethodsThis is a retrospective study, included elderly GBM patients treated at KFMC, Riyadh, KSA between 1/2008 till 1/2018. 59 patients diagnosed with GBM ≥ 60 years were reviewed regarding radiotherapy (Rth) fractionation modalities, surgery, and chemotherapy (CTR) given in correlation to PFS, OS.Results59 patients were recruited in our study with median age 66 range (60-81) years, 47 (80%) were males. 37 patients (62.7%) had Eastern Cooperative Oncology Group (ECOG) performance status (PS) ≥2, and 22 patients (37.3%) had PS < 2. Gross total resection (GTR) and subtotal resection (STR) was done in 49 (82.9%) patients, and the median follow-up was 12 months.38 (64%) patients received conventional Rth 60 Gray (Gy)/30 fractions or equal doses and 21 (36%) patients received hypofractionation Rth (40 Gy/15, 25 Gy/5 or 30 Gy/10 fractions).The median OS was 12 months (95% CI,9.52-14.48). For univariate analysis, receiving a conventional Rth and completion of 6 months adjuvant CTR were significant factors for O.S (P= 0.043 and 0.026) respectively. For multivariate those were also significant (P=0.035 and 0.002) respectively.The median PFS was 9 months (95% CI, 6.13-11.87). For univariate analysis PS, time to start adjuvant treatment, and completion of 6 months CTR were significant factors for PFS. For multivariate analysis starting adjuvant treatment within 2 months and completed CTR 6 months were significant factors (P=0.032 and 0.04) respectively. ConclusionElderly GBM patients who received conventional Rth and completed adjuvant 6 months CTR achieved a better OS, while starting adjuvant treatment earlier than 2 months and completed adjuvant CTR 6 months were associated with a better PFS, further prospective studies are needed to confirm our finding.