Overview of Breast Cancer TRACO Lecture Series - 2009. Farah Zia, MD Medical Officer, DCTD, NCI November 9, 2009. Definition of Breast Cancer Cancer that forms in tissues of the breast: Ducts: Tubes that carry milk to the nipple Lobules: Glands that make milk. Breast Cancer Progression. A.
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Farah Zia, MD
Medical Officer, DCTD, NCI
November 9, 2009
Definition of Breast CancerCancer that forms in tissues of the breast:Ducts: Tubes that carry milk to the nippleLobules: Glands that make milk
Overt non invasive carcinoma
Onset of local invasion
Onset of metastatic dissemination
Ductal Carcinoma in situ(DCIS) Most common type of non-invasive breast cancer.The cancer is only in the ducts and has not spread through the wall of the ducts into the tissue of the breast.Nearly all women with cancer at this stage can be cured.Best form of early detection is with a mammogram (non-palpable, asymptomatic)
Lobular Carcinoma in situ(LCIS)This condition begins in the milk glands, but does not go through the walls of the lobules into the breast tissue.Although not a true cancer, it does increase a woman’s risk of developing cancer later in life.It is important that women with LCIS have regular mammograms.
Invasive Ductal Carcinoma(IDC)This is the most common type of breast ca, accounting for 8 out of 10 invasive breast cancersDuct breaks thru duct wall invades tissueFrom there, it may enter the lymphatics and spread to other parts of the body.
Invasive Lobular Carcinoma(ILC)Lobules breaks thru wall breast tissueIt can then enter the lymphatics and spread to other parts of the bodyAccounts for only 1/10 invasive cancers
Relative Survival* (%)By Cancer SiteSite 1974-6 1983-5 1995-9All sites 50 53 64Breast (female) 75 78 88Colon 50 58 63Leukemia 34 41 46Lung and bronchus 13 14 15Melanoma of the skin 80 85 91Non-Hodgkin lymphoma 47 54 59Ovary 37 41 44†Pancreas 3 3 4Prostate 67 75 99
Breast CancerScreening MammographyReduces mortality by 26% in women aged 50-74,17% in women 40-49ACS recommends20 or older, BSE20-39 breast exam by physician every three years, 40 or older every yearMammography at age 40 and annually thereafter
Overall accuracy=to film mammograms
Better accuracy in
Increased mammographic density
2-6% of cancers seen only on MRI alone
Sensitivity for MRI higher than mammo
Specificity for MRI lower than mammo
More false + , more biopsies
Promising technique, need longer follow up and survival dataOther modalities of screening in high risk women
Metastasis to ipsilateral axillary lymph node(s)
N1 = movable
N2 = fixed to one another or to other structures
M0 = no distant metastasis
Targeting the Estrogen PathwayBlock receptorSERM (selective estrogen receptor modulators)Tamoxifen treatmentRaloxifene preventionDecrease ligandAromatase inhibitorsOopherectomyGnRH analogs
Tamoxifen Pharmacogenetics …. A Developing Area…. JAMA, Oct. 7, 2009 The growth inhibitory effect of tamoxifen is mediated by its metabolites:4-hydroxytamoxifenEndoxifenThe formation of these active metabolites is catalyzed by the polymorphic cytochrome P450 2D6 (CYP2D6) enzyme
CYP 2DG VariantsApproximately 100 CYP 2D6 genetic variants have been identified.These manifest in the population as 4 distinct phenotypes:Extensive (normal activity)Intermediate (reduced activity)Poor (no activity)Ultra-rapid (high activity)Thus, it can be speculated that genotype related differences in the formation of active metabolites influence therapeutic response to tamoxifen.
CYP 2DG VARIANTSTo investigate this relationship:Genotyped tumor tissue DNA for CYP2D6 variations in 1,325 breast cancer patients taking adjuvant tamoxifen.Women were classified as having either: 1. Extensive Metabolism (609 pts) 2. Heterozygous extensive/intermediate (637 pts) 3. Poor metabolism (79)Researchers found clear evidence that breast cancer was more likely to return in pts with reduced or absent CYP 2D6 function
CYP 2DG ACTIVITYExtensive metabolizers have a 14.9% recurrence at 9 yr FU Heterozygotes have a 20.9% recurrence at 9 yr FU Poor metabolizers have a 29% recurrence at 9 yr FU
Trials of AIs in the early adjuvant setting. In the ATAC trail patients received tamoxifen x5, anastrozole x 5 or tamoxifen + anastrozole x 5 resulting in a 22% improvement in DFS on anastrozole.In the BIG I-98 trial patients received tamoxifen x 5, letrosole x 5, tamoxifen x 2 + letrozole x 3 or tamoxifen x 3 + letroxole x 2.In the IES trial pateients received tamoxifen x 2-3 + tamoxifen x 2-3 or exemestane x 2-3 resulting in a 32% improvement in DFS with exemestane.In the ABCSGi ARNO 95 Ita trial pateints receive tamofen x 2-3 plus tamoxifen x 2-3 or anastozole x 2-3 resulting in a 43% improvement in DFS on letrozole.
SABCS 2008: Meta-analysis: Adjuvant Aromatase Inhibitors vs Tamoxifen in Postmenopausal WomenData was pooled from all trials started by 2000, prospectively comparing an AI and tamoxifen.The large number of events properly powered the subgroup analysis.
In the meta-analysis 9,856 breast cancer patients received: TAM x 5 yrs vs AI x 5 yrs.The 5 year recurrence with TAM or AI was 12.6% and 9.6% respectively. The 8 year recurrence with TAX or SI was 19.2 and 15.3% respectively.
AI’s reduced breast cancer recurrence.AI’s were associated with an absolute 2.9% lower recurrence rate at 5 years, that improved to a 3.9% gain at 8 years (15.3% vs 19.2%, P < 0.00001).Mortality Analysis, although still early at 3.9 years fu, showed a small, non-significant advantage to 5 years of AI mono-therapy. Gains of 1.1 % and 0.5% for 5 and 8 year breast cancer mortality.
AI’s reduced breast cancer recurrence.In 9015 patients treated with Tam x 2-3 years then aldosterone x 2-3 years, the 3 years recurrence for Tax or AI was 8.1% and 5% respectively.Patients treated with TAX or AI, the 6 year recurrence was 16.1% and 12.6% respectively.
Switch to an AI (after 2-3 years on TAM): absolute gain of 3.1% lower recurrence rate at 3 yrs after the switch and 3.5% at 6 years after the switch (P<0.00001) 0.7% lower breast cancer mortality at 3 years and 1.6% at 6 years (P=0.02)
How Long Should You Take AI’s? Studies are ongoingNo current absolute guidelinesAdjuvant options per the oncologists discretion include:Primary Rx AI x 5 yrsPrimary Rx TAM x 2 or 3 yrs AI x 2 or 3 yrsPrimary Rx TAM x 5 yrs AI x 5 yrs * Note: current standard of care = AI, Max 5 years Rx
EBCTCG: Systemic therapy28,000 women in 56 trials: Meta-analysisImpact of Polychemotherapy On Absolute Risk Reduction at 5 years (in % )Subgroup age < 50, Node- had a Recurrenceof 9.9% (SE 1.3).Subgroup Age < 50, Node+ had a recurrence of 14.6% (SE 2.3).Subgroup Age 50-69, Node- had a recurrence of 5.3 (SE 1.0).Subgroup Age 50-69, Node + had a recurrence of 5.9 (SE 1.0).
ErbB2/HER2 Action in Breast CA Member of the membrane-spanning type I receptor tyrosine kinase family, comprising 4 closely related family members.They dimerize upon ligand stimulation and transduce their signals by subsequent autophosphorylation, catalyzed by the receptor tyrosine kinase activity.This results in recruitment of an array of downstream signaling cascades (survival and mitogenic ) The incidence of ErbB2 amplification is ≈ 30% in breast cancer …Identifying it as a therapeutic target
HER-2: TrastuzumabBench to BedsideTargets HER2 proteinHigh affinity (Kd = 0.1 nM) and specificity95% human, 5% murineDecreases potential for immunogenicityIncreases potential for recruiting immune effector mechanisms Early-stage breast ca: 2005 - Herceptin + Chemo ↑OS ↑DFS
HER2 epitopes recognized by hypervariable murine antibody fragment
NSABP B-31Control: ACTThe patient receives4 treatments of doxorubicin/cyclophosphamide (AC) 60/600 mg/m2 q 3 wk x 4 followed by 4 treatments of paclitaxel (T) 175 mg/m2 q 3 wk x 4. Alternatively the patient receives 4 treatments of doxorubicin/cyclophosphamide (AC) 60/600 mg/m2 q 3 wk x 4 followed by 4 treatments of paclitaxel (T) 175 mg/m2 q 3 wk x 4followed by 4.5 treatments of trastuzumab (H) 4mg/kg LD + 2 mg/kg/wk x 51
ACT 1679 261
ACTH 1672 134
Years From Randomization
Triple –negative breast cancer refers to a specific subtype of breast cancer that does not express the genes for:Estrogen Receptor (ER) Progesterone Receptor (PR) HER2/neu
Triple-negative breast ca is clinically characterized as:More aggressiveLess responsive to standard chemotherapy treatmentAssociated with a poorer overall prognosis
Development of New Treatment Strategies For Triple Negative Breast Cancer ASCO, 2009PARP (poly ADP-ribose polymerase) Inhibitors:n experimental class of drugs that may have potential for the treatment of triple-negative breast cancer. PARP is an enzyme used by cancer cells to repair DNA damage.PARP inhibitors are being used to target tumors where one pathway is already shut down. - BRCA1/BRCA2 mutations lose a form of DNA repair and rely more heavily on the PARP pathway - Tumors which are either concurrently or pre-treated with chemotherapy also have damaged DNA repair pathways.
BSI-201116 women with triple-negative metastatic breast cancer randomized to standard chemotherapy vs standard chemo therapy + BSI-201. Median survival of 5.7 months with standard chemotherapy versus 9.2 months with BSI-201 plus chemotherapy.………………...
How can we do better?Better selection of chemotherapy regimensGene expression profiling to predict response to particular agents Better selection of patients for treatment with chemotherapyTreat only those patients who are most likely to recur AND who will therefore benefit most from the addition of chemotherapy… TAILORx Trial
An Important Question in Breast Cancer TreatmentWhat is the likelihood of distant recurrence in patients with breast cancer who have no involved lymph nodes and estrogen-receptor positive tumors? - These patients prognosis is poorly defined by histopathological and clinical measures alone
Oncotype DX A multi-step approach was used to:Develop an assay for the expression of tumor related genes for use with paraffin-embedded tumor tissue To validate the assay clinically
RT-PCR method was developed to quantify gene expression with paraffin-embedded tumor tissue.250 candidate genes were selected from published literature, genomic databases, and experiments based on DNA arrays done on fresh-frozen tissue.Data was analyzed from three independent clinical studies of breast ca involving 447 patients to test the relationship between expression of the 250 candidate genes and the recurrence of breast cancer.
Three Breast Cancer Studies Used To Select 21 Gene Panel 16 Cancer and 5 Reference Genes4. used the results of the 3 studies to select a panel of 16 cancer related genes and 5 reference genes. - Best RT-PCR performance - Most robust predictionsDesigned an algorithm based on the levels of expression of these genes to compute a recurrence score for each tumor sample being tested.Genes for proliferation (Ki-67, STK15, Survivin, Cyclin B1, MUBL2), estrogen (ER, PR, Bcl2, SCUBE2), invation (Stromolysin 3, Cathepsin L2) HER2 (GRB7, HER2), GSTM1, VD68, BAG1 and reference (Beta-actin, GAPDH, RPLPO, GUS, and TFRC) were studied.
Validation of Onco DX Paraffin-embedded tissue samples from patients previously enrolled in the NSABP B-14 trial were used to validate the ability of the 21 gene RT-PCR assay and RS algorithm to quantify the likelihood of distant recurrence in patients with: Node-negative, ER+, early stage breast cancer who had been previously treated with tamoxifen.
Kaplan-Meier Estimates of the Rate of Distant Recurrence at 10 years, If the Onco DX risk score is low (<18) the rate of distant recurrance at 10 years is 6.8%. In the Onco DX risk score is high (>31) the rate According to the Recurrence-Score Risk Categories. of distant recurrence at 10 years is 30.5%.
Oncotype DXValidated prognostic test for patients treated with hormonal therapy. Based on this study, the recurrence score has been validated as quantifying the likelihood of distant recurrence in tamoxifen-treated patients with node-negative, ER+ breast cancer.
Oncotype Dx: Chemotherapy benefit.Patients with tumors that have high Recurrence Scores have a large absolute benefit of chemotherapy (similar results with CMF and MF)Patients with tumors that have low Recurrence Scores derive minimal, if any, benefit from chemotherapy.RS < 18 RS = 18-30 RS >30
Ongoing Research: TAILORxLandmark trial - represents the culmination of a major initiative to integrate molecular diagnostic testing into clinical decision making.NCI is using Oncotype DX to identify and assign treatment to more than 10,000 breast cancer patients from 1,500 sites in the US, Canada, and Peru.
Purpose: to determine whether adjuvant hormonal therapy is as effective as adjuvant hormonal + chemo for women with a midrange RS. Eligibility: ER+ and/or PR+, Node-negative HER2/neu-negative breast cancerPrimary Objectives: 1. Determine whether adjuvant hormonal tx is not inferior to chemo-hormonal tx in women with a mid-range OncoDX RS (11-25) 2. Create a tissue and specimen bank for patients enrolled in this trial. To include: tumor specimens, tissue microarrays, plasma, & DNA from peripheral blood.
Schema: TAILORxStage I or II, ER+ and/or PR+, node-negative, HER2/neu negative, tumor size 1.1 – 5.0 cm Oncotype DX AssayRegister specimen bankingRS < 10 Hormone therapy registry RS 11 – 25, RandomizeHormone Rx vs. Chemotherapy + Hormone Rx RS > 25 Chemotherapy +Hormone Rx
Characteristics of MBCMedian survival approximately 2 to 3 years, with a 5-year survival of about 20%About 10% of women present at diagnosis with newly diagnosed metastatic breast cancer (MBC).Metastatic disease is considered incurable
Metastatic Breast Cancer
Progression of disease
If disease progresses, second-line hormonal therapy
Metastatic Breast Cancer: Hormonal therapySelective Estrogen Receptor ModulatorsTamoxifen, toremifene Aromatase Inhibitors (post-menopausal)Anastrozole, letrozole, or exemestane Selective Estrogen Receptor DownregulatorsFulvestrantProgestinsmegace 40 mg po 4 x dailyOvarian suppression (pre-menopausal) luteinizing hormone releasing analogoophorectomy
Hormone positive post-menopausal Metastatic Breast CancerFirst line: Antiestrogen or Nonsteroidal AI Anastrozole or Letrozole.Second line: Nonsteroidal AI or Antiestrogen.Third line: Steroidal AI:exemestane. Fourth line: Progestin. Fifth line: Androgen. If no response use chemotherapy
First - Line ChemotherapyAgent ORR (%)Docetaxel (75-100 mg/m2) 48-68ixabepilone 42Nab paclitaxel 33Paclitaxel (175-250 mg/m2) 29-63Doxorubicin (60-75 mg/m2) 43-54Capecitabine 35-50Vinorelbine 30-41Gemcitabine 25-37Carboplatin 7-35Cisplatin 9-50Cyclophosphamide 36Flourouracil 28Methotrexate 26
Bevacizumab (Avastin®):Humanized monoclonal antibody directed against all isoforms of VEGF-A (potent vasodilator and inducer of pathologic angiogenesis). - binds to VEGF, inhibits VEGF receptor bindingLaboratory and clinical evidence supports the central role of angiogenesis in the progression of breast cancer.Multiple angiogenic factors are expressed by invasive breast cancers - 121-amino-acid isoform of VEGF predominates
Bevacizumab in the First –line Treatment of Locally Recurrent or MBC ECOG 2100 TrialStratify: DFI < 24 mos. vs. > 24 mos. < 3 vs. > 3 metastatic sites Adjuvant chemotherapy yes vs. no ER+ vs. ER- vs. ER unknownRandomize and treat with paclitaxel + Bevacizumab or paclitaxel alone
Immune System Activation (Vaccines, Monoclonal antibodies)
Antireceptor Antibodies ± Toxins
Growth Factor Receptors
Tyrosine Kinase Inhibitors
Farnesyl Transferase Inhibitors
Intracellular Signaling Molecules
Angiogenesis Inhibitors (Angiostatin, Endostatin& Anti-VEGF)
Hormone Agonists/ Antagonists