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Second Line Treatment for Gastroesophageal Cancers: Are We Helping People Feel Better and Live Longer?. Johanna Bendell, MD Director, GI Oncology Research Associate Director, Drug Development Unit Sarah Cannon Research Institute Nashville, TN.

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Second Line Treatment for Gastroesophageal Cancers:Are We Helping People Feel Better and Live Longer?

Johanna Bendell, MD

Director, GI Oncology Research

Associate Director, Drug Development Unit

Sarah Cannon Research Institute

Nashville, TN


Second line therapy for gastroesophageal cancers a difficult situation
Second Line Therapy for Gastroesophageal Cancers – A Difficult Situation

  • After progression on first line therapy, only roughly 20% of patients receive second-line therapy with a median overall survival of 5.6 months (Chau, GI ASCO 2004)

  • Patients are sick

    • Symptomatic – weight loss, anorexia, pain, difficulties eating (with or without prior local intervention), N/V

  • Do we have data to show second line therapy can help?



  • Trial design
    Trial Design

    Arm A (n=84):

    Docetaxel 75mg/m2 IV every 3 weeks for up to 6 cycles

    + ASC

    Assess every 3 weeks for 18 weeks, then every 6 weeks

    Adenocarcinoma of esophagus, esophagus-gastric junction or stomach refractory to platinum and fluoropyrimide

    RANDOMISE

    1:1

    n=168

    Arm B (n=84):

    Active symptom control

    May include: Radiotherapy, analgesia, anti-emetics, steroids

    Stratified by:

    1.Disease status (Locally advanced vs metastatic);

    2. Site of disease (Esophagus vs GEJ vs Stomach);

    3. Time to progression after previous chemotherapy ( 0 vs 0-3 vs 3-6 months);

    4. ECOG PS ( 0/1 vs 2)


    Cougar 02
    COUGAR-02

    • Well-designed with good stratification factors

    • Screening vs. number enrolled show how difficult these trials are to accrue

      • Many are ineligible (sick population)

      • Refusal of study (vs. BSC)

    • Restaging at 3 and 6 cycles for docetaxel patients, as indicated for BSC patients (no TTP endpoint)

    • Included QUALITY OF LIFE


    This is a difficult population to treat
    This is a difficult population to treat

    • These patients are sick

    • Most do not complete treatment plan


    Toxicity
    Toxicity

    • Toxicity rates relatively low for q 3 week docetaxel

    • Only significant differences are neutropenia and febrile neutropenia

    • Relatively low neuropathy and thrombocytopenia

    • Due to low amount of chemotherapy given?

    • Median number of cycles of docetaxel given was 3


    Overall survival

    Median survival: 5.2 months (95% CI 4.1-5.9) for Docetaxel

    3.6 months (95% CI 3.3-4.4) for ASC

    Hazard ratio 0.67 (95% CI 0.49-0.92), p=0.01


    Who really received benefit
    Who really received benefit???

    • Patients who had disease progression 3-6 months after first line therapy

      • Longest disease free interval

      • Selection of patients who respond to therapy better

    • Patients with ECOG 0


    We help them live longer but do we help them feel better
    We Help Them Live Longer, But Do We Help Them Feel Better?

    • QoL forms (EORTC QLQ-C30, STO22, EQ5D) planned in both arms q 3 weeks for 18 weeks, then q 6 weeks

    • Number of QoL forms expected/returned lower in the control arm – potential source of bias, but common in these types of studies


    Quality of life eortc qlq c30
    Quality of life (EORTC QLQ-C30)

    • Standardised AUC analysis

    • Comparison using O’Brien global rank procedure

    • No significant differences in function or global health scale

    • Symptom score for pain significantly better in chemotherapy arm

    Global health Pain

    p=0.53

    p=0.0008

    CT ASC


    Cougar 2
    COUGAR-2

    • Chemotherapy benefits patients in the second line setting

      • We now see docetaxel and irinotecan work

      • But overall benefit is still around 1.5 mo

    • But need to think about who will really benefit

      • Can we get better at selecting the appropriate patient?

      • Longer PFI, better PS

      • Patients who respond better and feel better live longer


    Gefitinib in advanced esophageal cancer progressing after chemotherapy
    Gefitinib in advanced esophageal cancer progressing after chemotherapy

    Gefitinib 500mg od

    (n=225)

    Patients progressing following chemotherapy

    Simple randomisation

    Planned:

    18 months to recruit 450 patients

    Primary endpoint:

    Overall survival - powered to detect an increase in 1 year survival from 10 to 18%, 82.5% power, 5% significance level.

    Secondary endpoints:

    PFS, toxicity & PROs

    Placebo (n=225)

    • Multi-centre

    • Double-blind – patients, clinicians and trial office staff blinded to trial treatment

    • Treated until progression

    • Regular CT scans


    COG chemotherapy

    • No benefit for overall survival

      • 3.73 vs. 3.6 mo, HR 0.90 [0.74,1.09]

    • PFS

      • 1.60 vs. 1.17 mo, HR 0.795 [0.657,0.962]

      • Was there a subgroup who had benefit?

        • Is there a biomarker? Studies ongoing…

    • Did anyone feel better?

      • EORTC QLQ-C30

      • EORTC QLQ-OG25


    Quality of life
    Quality of Life chemotherapy

    • Planned assessments at baseline, 4, 8, and 12 weeks then until progression

    • Prespecified PRO: global QoL, dysphagia, difficulty eating, odynophagia

    • Primary evaluation at 4 weeks

      • Not surprisingly for this patient population, only 70% alive and progression free at 4 weeks (82.5% placebo vs. 74.7% geftinib compliance)


    • Odynophagia is improved in the chemotherapygefitinib arm at 4 weeks, and stays consistently better with time out to 12 weeks

    • This points to a group of patients who appear to benefit from gefitinib

    • There was a group with tumor shrinkage at 4 weeks

      • RR 3.1 vs 0.4%

      • DCR (8 weeks) 26 vs. 16% (p = 0.014)

    • Can we identify who they are?


    It always comes down to the biomarker question
    It always comes down to the biomarker question… chemotherapy

    • But what are the biomarkers?

    • REAL-3

      • Mutations/pathway dysregulation not common

      • EXPAND biomarkers pending

    • Though we do see EGFR overexpression (50-70%)

    • Squamous vs. adenocarcinoma

      • Different responses to EGFR inhibitors?

      • SCC head and neck respond

      • Lordick, et al, R ph II SCC esophagus,

        RR 19 vs. 13%,

        PFS 5.7 vs. 3.6 mo,

        OS 9.5 vs. 5.5 mo

    Chau 2011



    Moving forward
    Moving forward… chemotherapy


    T dm1 structure
    T-DM1 structure chemotherapy

    Target expression: HER2

    Monoclonal antibody: Trastuzumab

    Cytotoxic agent: DM1

    Highly potent cytotoxic agent

    T-DM1

    Linker: MCC

    Systemically stable

    T-DM1 is a novel ADC

    Trastuzumab

    Average drug:antibody ratio ≅3.5:1


    Trastuzumab chemotherapyEmtansine: Phase II Study of 2L treatment for HER2+ Metastatic Gastric Cancer

    Phase II

    n=100

    2L Her2 positive mGC

    PS: 0 -1

    IHC 3+ or IHC 2+/ISH+

    Prior Ctx + prior HER2

    N=412

    T-DM1 3.6 mg/kg q3 wk

    2

    T-DM1 2.4 mg/kg/wk

    2

    Stratified by:

    region, PS,

    prior gastrectomy,

    prior HER2-targeted tx

    1

    Chemotherapy**

    • Phase II: 3 arm; 2:2:1 randomization; endpoints: safety, PK, PFS, ORR; n=100

    • * Dose selection based on PK/safety/efficacy

    • ** Investigator’s choice between paclitaxel 80 mg/m2/wk and docetaxel 75 mg/m2 q 3 wk


    Regard randomized phase iii trial 2 nd line ramicirumab vs placebo
    REGARD: Randomized Phase III Trial 2 chemotherapynd Line Ramicirumab vs. Placebo

    22

    Ramucirumab IVq 2 weeks

    Second line metastatic gastric and GEJ adenocarcinoma

    R

    1:1

    Placeboq 2 weeks

    Press release 10/12: met primary endpoint

    of OS and secondary endpoint of PFS

    Press release 1/23/13: OS 5.2 vs. 2.6 mo

    PFS 2.1 vs. 1.3 mo

    Primary EP: OS

    N = 355


    Rainbow randomized phase iii trial 2 nd line paclitaxel ramicirumab
    RAINBOW: Randomized Phase III Trial 2 chemotherapynd Line Paclitaxel +/- Ramicirumab

    23

    Paclitaxel 80 mg/m2 d1, 8, 15 +

    Ramucirumab IVq 2 weeks

    Second line metastatic gastric and GEJ adenocarcinoma

    R

    1:1

    Paclitaxel 80 mg/m2 d1, 8, 15 +

    Placeboq 2 weeks

    Primary EP: OS

    N = 665


    Second line treatment of gastroesophageal cancers
    Second Line Treatment of chemotherapyGastroesophageal Cancers

    • Consistent trials showing some benefit to chemotherapy

    • COUGAR trial shows docetaxel is an appropriate chemotherapy choice

    • COG trial shows gefitinib overall does not improve survival endpoints

    • However, both trials show suggestion of subpopulations that may benefit more

      • COUGAR – longer PFI, better PS

      • COG – subpopulation with improved QoL factors

    • Drug development in this setting needs to be more targeted to the right population

      • We are doing this

      • TDM1 for HER2 positive patients

      • Inclusion of biomarker studies and QoL in trials for this population


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