TY - JOUR
T1 - Exploring the Clinical Benefit of Docetaxel or Enzalutamide after Disease Progression during Abiraterone Acetate and Prednisone Treatment in Men with Metastatic Castration-Resistant Prostate Cancer
AU - Zhang, Tian
AU - Dhawan, Mallika S.
AU - Healy, Patrick
AU - George, Daniel J.
AU - Harrison, Michael R.
AU - Oldan, Jorge
AU - Chin, Bennett
AU - Armstrong, Andrew J.
N1 - Publisher Copyright:
© 2015 Elsevier Inc. All rights reserved.
PY - 2015/8/1
Y1 - 2015/8/1
N2 - Background Abiraterone acetate (AA) has demonstrated improved outcomes in men with metastatic castration-resistant prostate cancer (mCRPC). However, data are lacking on the effect of AA on subsequent efficacy of enzalutamide or docetaxel. Patients and Methods We included men with mCRPC who received AA and subsequent enzalutamide or docetaxel by August 12, 2013. Patients were separated into 3 groups: group A, treated with AA then enzalutamide before chemotherapy; group B, treated with AA then docetaxel; and group C, treated with AA and enzalutamide after chemotherapy. The primary objective was to describe the response and overall survival with subsequent therapy. Results There were 28 evaluable patients who received enzalutamide after AA (9 in group A and 19 in group C) and 13 patients who received docetaxel after AA (group B). Group A patients had more visceral disease and higher baseline prostate-specific antigen (PSA) levels, and group C men had a higher level of pain and multiple poor prognostic features. Median progression-free survival was 3.6, 5.1, and 2.8 months, respectively, and median overall survival was 8.5, not reached, and 9.6 months, respectively. A 50% PSA decline was achieved in 11%, 63%, and 5% of group A, B, and C patients, respectively. Radiographic or clinical progression as best response was noted in 55.5%, 30.8%, and 68.4% in each respective group. Conclusion In this chart review of consecutive men with progressive mCRPC after AA, we found modest activity for enzalutamide and docetaxel, with clear cross-resistance for AA and enzalutamide. These data might inform the complex treatment decisions after AA treatment.
AB - Background Abiraterone acetate (AA) has demonstrated improved outcomes in men with metastatic castration-resistant prostate cancer (mCRPC). However, data are lacking on the effect of AA on subsequent efficacy of enzalutamide or docetaxel. Patients and Methods We included men with mCRPC who received AA and subsequent enzalutamide or docetaxel by August 12, 2013. Patients were separated into 3 groups: group A, treated with AA then enzalutamide before chemotherapy; group B, treated with AA then docetaxel; and group C, treated with AA and enzalutamide after chemotherapy. The primary objective was to describe the response and overall survival with subsequent therapy. Results There were 28 evaluable patients who received enzalutamide after AA (9 in group A and 19 in group C) and 13 patients who received docetaxel after AA (group B). Group A patients had more visceral disease and higher baseline prostate-specific antigen (PSA) levels, and group C men had a higher level of pain and multiple poor prognostic features. Median progression-free survival was 3.6, 5.1, and 2.8 months, respectively, and median overall survival was 8.5, not reached, and 9.6 months, respectively. A 50% PSA decline was achieved in 11%, 63%, and 5% of group A, B, and C patients, respectively. Radiographic or clinical progression as best response was noted in 55.5%, 30.8%, and 68.4% in each respective group. Conclusion In this chart review of consecutive men with progressive mCRPC after AA, we found modest activity for enzalutamide and docetaxel, with clear cross-resistance for AA and enzalutamide. These data might inform the complex treatment decisions after AA treatment.
KW - Abiraterone
KW - Castration resistant prostate cancer
KW - Cross-resistance
KW - Docetaxel
KW - Enzalutamide
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U2 - 10.1016/j.clgc.2015.01.004
DO - 10.1016/j.clgc.2015.01.004
M3 - Article
C2 - 25708161
AN - SCOPUS:84936986429
SN - 1558-7673
VL - 13
SP - 392
EP - 399
JO - Clinical Genitourinary Cancer
JF - Clinical Genitourinary Cancer
IS - 4
ER -