0002; Fig. 1). When the elderly group was analyzed further, the median PFS for patients aged 75–84 years and ≥85 years was 74 days (95% CI, 69–82) and 72 days (95% CI, 56–93), respectively (P = 0.0010; Fig. 2). In patients with clinical features associated with better EGFR TKI efficacy (i.e. adenocarcinoma, nonsmoking status, ECOG PS 0–2, and second-/third-line treatment setting) who had not previously received gefitinib, the median PFS was 176 days (95% CI, 152–198) for Talazoparib patients aged <75 years, 213 days (95% CI, 172–261) for patients aged 75–84 years, and 341 days (95% CI, 205–not reached) for patients aged ≥85 years (P = 0.0896; Fig. 3A). In patients with clinical features associated

with better EGFR TKI efficacy (as described earlier) who had previously received gefitinib, the median PFS was 100 days (95% CI, 91–109) for patients aged <75 years, 108 days (95% CI, 92–126) for patients aged 75–84, and 70 days (95% CI, 56–103) for patients aged ≥85 years (P = 0.2344; Fig. 3B). The median PFS for patients with

ECOG PS 0–2 was 71 days (95% CI, 68–74) for patients aged <75 years, 80 days (95% CI, 73–88) for patients aged 75–84, and 80 days (95% CI, 66–117) for patients aged ≥85 years (Fig. 4A). The median PFS for patients with ECOG PS 3–4 was 24 days (95% CI, 22–28) for patients aged <75 years, 25 days (95% CI, 22–37) for patients aged 75–84 years, and 27 days (95% CI, 13–37) for patients aged ≥85 years (Fig. 4B). The POLARSTAR study included a high number of patients who were ≥75 years old and eligible for inclusion in the safety STA-9090 purchase and efficacy analysis. The incidence of hematologic and nonhematologic toxicity was comparable between older and younger patients. Rash, a well-known side effect of erlotinib treatment, Carnitine dehydrogenase was neither more common nor more severe in elderly patients, confirming previous studies suggesting age is not a predictor of rash [14]. ILD, a rare but potentially serious drug-related complication, has been reported in approximately 5% of erlotinib-treated Japanese

patients with around half of these cases being fatal [8], [9] and [10]. The incidence of ILD, primary endpoint of the POLARSTAR study, was similar between age groups and was comparable with that previously reported in Japanese patients [8], [9] and [10]. The results of a previous multivariate analysis of the POLARSTAR study data showed that concurrent or previous ILD; smoking status; concurrent or previous emphysema or chronic obstructive pulmonary disease (COPD); period from initial diagnosis to start of treatment; concurrent or previous lung infection; ECOG PS; history of gefitinib treatment; and number of chemotherapy regimens were each significant risk factors for developing ILD [15]. Conversely, age was not identified as a risk factor [15], which was consistent with the results of this exploratory analysis of POLARSTAR by age.