Early treatment modifications improve chemotherapy adherence in ovarian cancer patients ≥70 years.

Objective: Elderly ovarian cancer patients are underrepresented in clinical trials and disadvantaged with regard to therapeutic standards compared to other age groups. We explored the specific performance of a subset of patients aged ≥70 years in a large meta-data set of 3 phase III trials.

Methods: 3333 patients with advanced ovarian cancer recruited into 3 clinical phase III trials of the AGO & GINECO study groups were retrospectively analysed for age-specific prognostic and toxicity parameters.

Results: Only 10% (359/3333) of the patients were aged ≥70 years. This subgroup presented with impaired performance statuses (ECOG 2 14.8 vs 10.1%) and higher FIGO-stages (FIGO IIIC-IV 78.5 vs 73.6%) compared to younger patients. Complete operative tumor resection was achieved less frequently (postoperative tumor burden >10 mm 46.7 vs 33.9%) and elderly received less cycles of platinum/taxane-based chemotherapies (>4 cycles 81.9 vs 90.7%). FIGO-stage, histology, postoperative tumor burden and number of chemotherapy cycles were independent prognostic factors in elderly patients. Elderly patients with ≤4 cycles of chemotherapy showed a median OS of 18.4 months compared to 30.9 months in elderly with 5-6 cycles (p < 0.001). This effect was accentuated in elderly patients after complete tumor resection (cumulative survival benefit of 33.8 months). Analyses of chemotherapeutic delivery revealed that elderly patients with at least one cycle delay had higher chances to complete >4 cycles of chemotherapy.

Conclusions: Protocol defined treatment modifications might support completion of >4 cycles of standard chemotherapy in fit elderly OC patients.