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2014 ; 105
(3
): 347-53
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Phase I dose-escalation study of buparlisib (BKM120), an oral pan-class I PI3K
inhibitor, in Japanese patients with advanced solid tumors
#MMPMID24405565
Ando Y
; Inada-Inoue M
; Mitsuma A
; Yoshino T
; Ohtsu A
; Suenaga N
; Sato M
; Kakizume T
; Robson M
; Quadt C
; Doi T
Cancer Sci
2014[Mar]; 105
(3
): 347-53
PMID24405565
show ga
Buparlisib (BKM120) is an oral pan-phosphatidylinositol 3-kinase inhibitor,
targeting all four isoforms of class I PI3K (?, ?, ? and ?). This open-label
Phase I dose-escalation study was conducted to determine the maximum tolerated
dose of continuous daily buparlisib in Japanese patients with advanced solid
tumors. Secondary objectives included safety and tolerability, pharmacokinetics,
antitumor activity and pharmacodynamic marker changes. Fifteen patients were
treated at 25 mg/day (n = 3), 50 mg/day (n = 3) and 100 mg/day (n = 9) dose
levels. One dose-limiting toxicity of Grade 4 abnormal liver function occurred at
100 mg/day. Considering the safety profile and the maximum tolerated dose in the
first-in-man study of buparlisib in non-Japanese patients, further dose
escalation was stopped and 100 mg/day was declared the recommended dose. The most
common treatment-related adverse events were rash, abnormal hepatic function
(including increased transaminase levels), increased blood insulin levels and
increased eosinophil count. Hyperglycemia was experienced by two patients, one
Grade 1 and one Grade 4, and mood alterations were experienced by three patients,
two Grade 1 and one Grade 2. Pharmacokinetic results showed that buparlisib was
rapidly absorbed in a dose-proportional manner. Best overall response was stable
disease for six patients, including one unconfirmed partial response. In these
Japanese patients with advanced solid tumors, buparlisib had a manageable safety
profile, with similar pharmacokinetics to non-Japanese patients. The recommended
dose of 100 mg/day will be used in future studies of buparlisib in Japanese
patients.