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Ma CX, Gao F, Northfelt D, Goetz M, Forero A, Naughton M, Ademuyiwa F, Suresh R, Anderson KS, Margenthaler J, Aft R, Hobday T, Moynihan T, Gillanders W, Cyr A, Eberlein TJ, Hieken T, Krontiras H, Hoog J, Han J, Guo Z, Vij K, Mardis E, Al-Kateb H, Sanati S, Ellis MJ. Abstract S6-05: A phase II trial of neoadjuvant palbociclib, a cyclin-dependent kinase (CDK) 4/6 inhibitor, in combination with anastrozole for clinical stage 2 or 3 estrogen receptor positive HER2 negative (ER+HER2-) breast cancer (BC). Cancer Res 2016. [DOI: 10.1158/1538-7445.sabcs15-s6-05] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background
ER+ BC is associated with activated CDK4/6. The CDK4/6 inhibitor palbociclib (P) markedly improves time to progression in advanced ER+HER2- BC. We conducted a neoadjuvant phase II trial to determine the activity of P in primary breast cancer as a prelude to adjuvant studies.
Methods
To assess molecular changes induced by anastrozole (A) or P+A, patients (pts) were treated initially with A alone (1mg PO daily) for 28 days in cycle 0 (C0) before the addition of P (125mg PO daily on D1-21 each cycle) on C1D1. P+A was administered for 4 28-day cycles followed by C5 with A alone for 2-4 weeks (wks) before surgery. P was added in C5 for 10-12 days immediately prior to surgery in the last 20 pts enrolled to assess molecular changes induced by A, either alone or in combination with P immediately prior to surgery, in resected tumor. Goserelin was added in premenopausal pts.
Research tumor biopsies were obtained at baseline, C1D1, and C1D15. Central Ki67 analysis was performed at all timepoints, those with Ki67 >10% at C1D15 went off study treatment.
The primary endpoint was complete cell cycle arrest (CCA), defined as Ki67 <2.7%, at C1D15. Patient stratification was based on PIK3CA mutation status with an initial focus on PIK3CA wild type (WT) disease. Pts with PIK3CA mutant (Mut) tumors enrolled to a separate cohort. A sample size of 33 pts in the PIK3CA WT cohort was chosen based on the Fleming's single-stage phase II design to test the hypothesis that P+A leads to > 50% improvement over A in CCA rate on C1D15 biopsy (44% with A alone based on historical data, vs 66% with P+A, power = 0.8, alpha=0.05). The primary endpoint is met if >20 pts achieved CCA in this cohort.
Correlative endpoints included assessment of markers of proliferation, apoptosis, senescence, Rb, gene expression microarray, intrinsic subtype, and next generation sequencing of 83-gene panels, which will be reported at the meeting.
Results
Between 4/23/2013 and 4/24/2015, 50 pts (33 PIK3CA WT, 11 PIK3CA Mut, 2 pending, 4 tissue quantity or quality not sufficient for sequencing (QNS)) were enrolled to the study. Median age was 57.5 (range: 34.1–79.6) years. Four pts, all with WT PIK3CA, went off study due to Ki67 >10% on C1D15 biopsy, 26 pts completed treatment and surgery, 1 refused surgery, 3 withdrew study treatment in C1, and 16 continued to receive study drug (2 in C0, 3 in C1, 4 in C2, 5 in C3, 1 in C4, and 1 in C5). Among the 40 pts currently evaluable for the primary endpoint (C1D15 Ki67), CCA occurred in 34 (85%) pts, including 9 of 9 (100%) PIK3CA Mut, 22 of 28 (78.5%) WT, and 3 of 3 QNS pts. Preliminary analysis of available data indicated a significantly lower Ki67 value after 2 wks of P+A (C1D15) compared to that on A alone (C1D1) (p=0.034, n=18).
Conclusion
This study met the primary endpoint demonstrating that P+A is a highly effective anti-proliferative combination. The sequential biopsy design clearly demonstrated that P+A increased cell cycle control over A alone. P+A was effective regardless of PIK3CA mutation status and these results support the evaluation of this combination in the adjuvant setting for ER+HER2- BC.
Citation Format: Ma CX, Gao F, Northfelt D, Goetz M, Forero A, Naughton M, Ademuyiwa F, Suresh R, Anderson KS, Margenthaler J, Aft R, Hobday T, Moynihan T, Gillanders W, Cyr A, Eberlein TJ, Hieken T, Krontiras H, Hoog J, Han J, Guo Z, Vij K, Mardis E, Al-Kateb H, Sanati S, Ellis MJ. A phase II trial of neoadjuvant palbociclib, a cyclin-dependent kinase (CDK) 4/6 inhibitor, in combination with anastrozole for clinical stage 2 or 3 estrogen receptor positive HER2 negative (ER+HER2-) breast cancer (BC). [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr S6-05.
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Affiliation(s)
- CX Ma
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - F Gao
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - D Northfelt
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - M Goetz
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - A Forero
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - M Naughton
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - F Ademuyiwa
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - R Suresh
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - KS Anderson
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - J Margenthaler
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - R Aft
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - T Hobday
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - T Moynihan
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - W Gillanders
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - A Cyr
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - TJ Eberlein
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - T Hieken
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - H Krontiras
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - J Hoog
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - J Han
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - Z Guo
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - K Vij
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - E Mardis
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - H Al-Kateb
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - S Sanati
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
| | - MJ Ellis
- Washington University, Saint Louis, MO; Mayo Clinic, Scottsdale, AZ; Mayo Clinic, Rochester, MN; University of Alabama at Birmingham, Birmingham, AL; Baylor College of Medicine, Houston, TX
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Ma CX, Suman VJ, Goetz M, Northfelt D, Burkard M, Ademuyiwa F, Naughton M, Margenthaler J, Aft R, Gray R, Tavaarwerk A, Wilke L, Haddad T, Moynihan T, Loprinzi C, Hieken T, Hoog J, Guo Z, Han J, Vij K, Mardis E, Sanati S, Al-Kateb H, Doyle L, Erlichman C, Ellis MJ. Abstract P5-13-04: A phase II neoadjuvant trial of MK-2206, an AKT inhibitor, in combination with anastrozole for clinical stage 2 or 3 PIK3CA mutant estrogen receptor positive HER2 negative (ER+HER2-) breast cancer (BC). Cancer Res 2016. [DOI: 10.1158/1538-7445.sabcs15-p5-13-04] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background
Activating mutations in PIK3CA occur in approximately 40% ER+BC. MK-2206 (M), a pan-AKT inhibitor, induced apoptosis of ER+ BC under estrogen deprivation in preclinical studies. We conducted this neoadjuvant trial to determine the pathologic complete response (pCR) rate of M plus anastrozole (A) for PIK3CA mutant (Mut) ER+ BC.
Methods
This single arm open label study of M+A used a 2-stage Simon phase II design (stage 1, n=16; stage 2, n=13, alpha=0.10, power=0.90) to test whether pCR rate <1% (based on historical data with A alone), against the alternative that pCR rate ≥15% in PIK3CA Mut ER+ BC. At least 1 pCR in stage 1 was required to proceed to stage 2.
Eligible patients (pts) with clinical stage II or III ER+HER2- BC were pre-registered and proceeded to a research tumor biopsy for PIK3CA sequencing, followed by treatment with daily A monotherapy for 28 days (cycle 0). Pts with PIK3CA Mut BC were subsequently registered, underwent a second biopsy, and started M (150mg PO weekly) with daily A on cycle 1 day 1 (C1D1) for a maximum of four 28-day cycles followed by surgery. Goserelin was added for premenopausal pts. A tumor biopsy on C1D17, 17 days post the start of M, was performed. Those with C1D17 Ki67 >10% discontinued study treatment. pCR was defined as no invasive cancer in the breast and the lymph nodes. Tumor specimens collected at all timepoints are being analyzed for markers of proliferation, apoptosis, and PI3K pathway activity, gene expression microarray, intrinsic subtypes, and next generation sequencing of 83 genes.
Results
Of the 51 pts pre-registered, 35 pts did not register due to no PIK3CA mutation (n=22), inadequate specimen for testing (n=6), physician/pt decision (n=7). The remaining 16 pts (median age: 58, range: 40-77 years) received combination therapy. Three pts did not complete 4 cycles due to C1D17 Ki67 >10% (n=2) and intolerability (grade (Gr) 4 transaminase elevation in C1, n=1). Other severe toxicities possibly related to M included Gr 3 rash (25%) and pruritus (12.5%). Of the 13 pts completed study therapy and underwent surgery, all had residual disease in the breast and 7 also had positive nodes. Table 1 summarized changes in Ki67 during treatment.
ComparisonsnAbsolute changes in Ki67 median (range)Wilcoxon signed rank p-valueC1D1 relative to pre-registration11-17.0% (-49.8 to 4.1%)0.0020C1D17 relative to pre-registration14-16.4% (-51.4 to 4.1%)0.0004C1D17 relative to C1D112-1.5% (-18.6 to 15.8%)0.9697C1D1, biopsy post 28 days of A alone; C1D17 biopsy post 17 days on combination therapy
Although Ki67 levels post A monotherapy (C1D1) or M+A (C1D17) were significantly lower than that of pre-registration samples, Ki67 did not differ between C1D17 and C1D1 samples. Other correlative studies are ongoing and results will be presented.
Conclusion
Despite the small sample size, biomarker analysis on serial biopsy specimens demonstrated that M+A is unlikely to be more effective than A alone in PIK3CA Mut ER+ BC. This trial demonstrated the feasibility of genomic sequencing for pt selection and the value of a small, well-designed proof-of-principle neoadjuvant trial for the evaluation of targeted agents.
Citation Format: Ma CX, Suman VJ, Goetz M, Northfelt D, Burkard M, Ademuyiwa F, Naughton M, Margenthaler J, Aft R, Gray R, Tavaarwerk A, Wilke L, Haddad T, Moynihan T, Loprinzi C, Hieken T, Hoog J, Guo Z, Han J, Vij K, Mardis E, Sanati S, Al-Kateb H, Doyle L, Erlichman C, Ellis MJ. A phase II neoadjuvant trial of MK-2206, an AKT inhibitor, in combination with anastrozole for clinical stage 2 or 3 PIK3CA mutant estrogen receptor positive HER2 negative (ER+HER2-) breast cancer (BC). [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P5-13-04.
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Affiliation(s)
- CX Ma
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - VJ Suman
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - M Goetz
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - D Northfelt
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - M Burkard
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - F Ademuyiwa
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - M Naughton
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - J Margenthaler
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - R Aft
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - R Gray
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - A Tavaarwerk
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - L Wilke
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - T Haddad
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - T Moynihan
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - C Loprinzi
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - T Hieken
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - J Hoog
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - Z Guo
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - J Han
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - K Vij
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - E Mardis
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - S Sanati
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - H Al-Kateb
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - L Doyle
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - C Erlichman
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
| | - MJ Ellis
- Washington University, Saint Louis, MO; Mayo Clinic, Rochester, MN; Mayo Clinic, Scottsdale, AZ; Universtiy of Wisconsin, Madison, WI; National Cancer Institute, Bethesda, MD; Baylor College of Medicine, Houston, TX
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