No abstract

The close association between bacteria and insect hosts has played an indispensable role in insect diversity and ecology. Thus, continued characterization of such insect-associated-microbial communities is imperative, especially those of saprophagous scarab beetles. The bacterial community of the digestive tract of adults and larvae of the cetoniine scarab species Cotinis nitida is characterized according to life stage, gut structure, and sex via high-throughput 16S rRNA gene amplicon sequencing. Through permutational ANOVAs of the resulting sequences, bacterial communities of the digestive system are shown to differ significantly between adults and larvae in taxon richness, evenness and relatedness. Significant bacterial community-level differences are also observed between the midgut and hindgut in adult beetles, while no significant host-sex differences are observed. The partitioning between bacterial communities in the larval digestive system is shown through significant differences in two distinct hindgut regions, the ileum and the expanded paunch, but not between the midgut and ileum portion of the hindgut region. These data further corroborate the hypothesis of strong community partitioning in the gut of members of the Scarabaeoidea, suggest hypotheses of physiological-digestive association, and also demonstrate the presence of a seemingly unusual non-scarab-associated taxon. These findings contribute to a general portrait of scarabaeoid digestive tract bacterial communities while illuminating the microbiome of a common new world cetoniine of the Gymnetini—a tribe largely neglected in scarab and beetle microbiome and symbiosis literature.

101 Background: The disease course of FL is characterized by multiple relapses and progressively shorter response durations with subsequent therapies. As a result, numerous treatment strategies have been developed to reduce the risk of progression including consolidation with transplantation, radio-immunotherapy (RIT), or maintenance therapy with rituximab (R). At present, the optimal therapeutic strategy for FL patients (pts) remains undefined. R maintenance and RIT with an anti-CD20 antibody linked to iodine-131 (I131 Tositumomab) or to yttrium-90 (Y90-ibritumomab tiuxetan) have emerged as well tolerated treatments following induction. To quantify the benefits of consolidative RIT, we conducted a systematic review of the literature and a meta-analysis of selected studies. Methods: As part of a broader review, we searched the Cochrane Central Register of Controlled Trials (Cochrane Library Issue, 2011), MEDLINE (1/1966-6/2011), American Society of Hematology Annual Meeting abstracts (2004–2010), and American Society of Clinical Oncology Annual Meeting abstracts (2007–2010). Each database was searched using combinations of the term ‘follicular lymphoma' and the terms for treatment regimens. Inclusion criteria for studies were as follows: 1) reports on phase 2/3 studies; 2) n≥30; 3) previously untreated patients 4) treatment with RIT targeted at the CD20 antigen following an induction regimen; 5) original reporting in English of the following treatment outcome measures for pts with FL: CR/CR-unconfirmed, OR, and at least one form of survival data. Extracted data included pre-treatment disease status, pt characteristics, treatment regimen, progression free survival (PFS), overall survival (OS), complete response (CR) and overall response (OR). Pooled estimates of the CR rate, OR rate, 2-year PFS and 5-year PFS for pts treated with consolidative RIT were computed using DerSimonian and Laird random effects models. Results: Over 1136 records were reviewed with 8 studies meeting inclusion criteria with 556 patients. Between 1998 and 2007, pts were accrued at multiple sites in all but one study. Median ages ranged from 49–57 years with 41–61% male subjects, among the studies reporting gender. A weighted average of 97.2% of patients had stage III/IV disease with 73–98% pts having grade 1/2 disease, among those studies reporting histology. Among studies reporting this information, 19–44% of patients had abnormal LDH values, and 25–100% had bulky lymph nodes. CR rates ranged from 51% to 97%, 2-year PFS ranged from 65% to 86%, and 5-year PFS ranged from 38% to 67%. The pooled estimates of the CR rate and OR rate following consolidative RIT were 78% (95% CI 66%–87%) and 98% (95% CI 92.9%–99.5%), respectively (Figure A). The pooled estimates for the 2-year and 5-year PFS were 77.0% (95% CI 70.5–82.4%) and 56.0% (95% CI 41.9–69.2%), respectively (Figure B). Conclusions: This analysis suggests that consolidative RIT is beneficial to patients with previously untreated FL with meaningful CR rates and 5-year PFS. In addition, consolidative RIT compares favorably to maintenance therapy with R given after chemotherapy (ECOG 1496) in both 2-year PFS (77.0% vs. 73.5%) and 5-year PFS (56.0% vs. 46.4%), and needs to be compared to maintenance R following R-chemotherapy induction. Disclosures: Flowers: Genentech/Roche (unpaid): Consultancy; Celgene: Consultancy, Research Funding; Millennium/Takeda: Consultancy, Research Funding; Seattle Genetics: Consultancy; Novartis: Research Funding; Spectrum: Consultancy, Research Funding.