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Tanespimycin monotherapy in relapsed multiple myeloma: results of a phase 1 dose‐escalation study
Author(s) -
Richardson Paul G.,
ChananKhan Asher A.,
Alsina Melissa,
Albitar Maher,
Berman David,
Messina Marianne,
Mitsiades Constantine S.,
Anderson Kenneth C.
Publication year - 2010
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1111/j.1365-2141.2010.08265.x
Subject(s) - medicine , nausea , multiple myeloma , pharmacokinetics , gastroenterology , refractory (planetary science) , adverse effect , hematology , pharmacology , urology , biology , astrobiology
Summary Tanespimycin, a heat shock protein 90 (HSP90) inhibitor, induces apoptosis in drug‐sensitive and ‐resistant MM cell lines and in tumour cells from patients with relapsed MM. In this phase 1 dose‐escalation study, the safety, plasma pharmacokinetics, and biological/antitumour activity of tanespimycin were evaluated in heavily pretreated patients with relapsed/refractory MM. Tanespimycin (150–525 mg/m 2 ) was given on days 1, 4, 8, and 11 of each 3‐week cycle for up to 8 cycles. Non‐haematological AEs included diarrhoea (59%), back pain (35%), fatigue (38%), and nausea (35%); haematological AEs included anaemia (24%) and thrombocytopenia (21%). One patient (3%) achieved minimal response (MR), with a progression‐free survival (PFS) of 3 months, a 41% decrease from baseline in urine M protein, and a 33% decrease from baseline in serum M protein. Fifteen patients (52%) achieved SD with a median PFS of 2·1 months; 5/15 had reductions in serum M protein ranging from 7% to 38% and in urine M protein ranging from 6% to 91%. Mean HSP70 levels increased from day 1 h 0 to day 1 h 4 with further increases on day 11 h 0 and day 11 h 4, consistent with a therapeutic treatment effect. Tanespimycin monotherapy was well tolerated and demonstrated activity across all doses tested.