Biological and clinical features of non-Hodgkin's lymphoma in the elderly

The incidence of non-Hodgkin's lymphomas (NHLs) in elderly people has increased in recent years because the world population is getting older. The aim of this study was to compare the biological and clinical features in patients diagnosed with NHLs younger and older than 65 years, and the possible influence of age on the choice of optimal therapeutic approach.

We retrospectively evaluated 193 patients with NHLs: 111 (68%) were <65 years and 82 (42%) ≥65 years. The following parameters were analysed: age, gender, clinical stage, International Prognostic Index (IPI), histological type, presence of B symptoms, disease localization, presence of bulky mass, Karnofsky performance status (PS), comorbidities, blood counts, liver and renal function and serum LDH.

Elderly patients had statistically more frequent indolent NHLs (p=0.036), IPI 3 and 4 (p<0.0001), presence of comorbidities (p<0.001), and less frequent presence of bulky disease (p7equals;0.043). Response to therapy was different in the 2 age groups: 29% of patients ≥65 years achieved complete remission (CR) in contrast to 71% of patients <65 years (p<0.001). The most frequent cause of death was disease progression (PD) (86% of younger patients and 71% of elderly patients (p7equals;0.150). Older patients died more frequently because of comorbidities compared younger ones (21 and 107percnt;, respectively; p=0.250), and had more complications of therapy (8.1 and 47percnt;, respectively (p=0.320). Overall survival (OS) was shorter in older patients in all lymphoma types: indolent lymphoma (36 vs. 17 months), aggressive (22 vs. 20 months) and very aggressive (14 vs. 1 months). Multivariate analysis showed that parameters for shorter survival in the elderly were Karnofsky PS <60, increased serum LDH and treatment toxicity.

In elderly NHLs patients, treatment response and survival are significantly poorer. Since older patients mostly died of PD, they should be treated with standard regimens and best supportive measures.