Author: RR

FDA Approves TIBSOVO® for Newly Diagnosed AML Patients Ineligible for Intensive Chemotherapy

RR

SUMMARY: The FDA on May 2, 2019, approved TIBSOVO® (Ivosidenib) for newly-diagnosed acute myeloid leukemia (AML) with a susceptible IDH1 (Isocitrate DeHydrogenase-1) mutation, as detected by an FDA-approved test, in patients who are at least 75 years old or who have comorbidities that preclude the use of intensive induction chemotherapy. The American Cancer Society estimates that for 2019, 21,450 new cases of Acute Myeloid Leukemia (AML) will be diagnosed in the United States and 10,920 patients will die of the disease. AML can be considered as a group of heterogeneous diseases with different clinical behavior and outcomes. Cytogenetic analysis has been part of routine evaluation when caring for patients with AML. By predicting resistance to therapy, tumor cytogenetics will stratify patients, based on risk and help manage them accordingly. Even though cytotoxic chemotherapy may lead to long term remission and cure in a minority of patients with favorable cytogenetics, patients with high risk features such as unfavorable cytogenetics, molecular abnormalities, prior Myelodysplasia and advanced age, have poor outcomes with conventional chemotherapy alone.MOA-of-Ivosidenib

Isocitrate DeHydrogenase (IDH) is a metabolic enzyme that helps generate energy from glucose and other metabolites, by catalyzing the conversion of Isocitrate to Alpha-Ketoglutarate. Alpha-ketoglutarate is required to properly regulate DNA and histone methylation, which in turn is important for gene expression and cellular differentiation. IDH mutations lead to aberrant DNA methylation and altered gene expression thereby preventing cellular differentiation, with resulting immature undifferentiated cells. IDH mutations can thus promote leukemogenesis in Acute Myeloid Leukemia and tumorigenesis in solid tumors and can result in inferior outcomes. There are three isoforms of IDH. IDH1 is mainly found in the cytoplasm, as well as in peroxisomes, whereas IDH2 and IDH3 are found in the mitochondria, and are a part of the Krebs cycle. Approximately 20% of patients with AML, 70% of patients with Low-grade Glioma and secondary Glioblastoma, 50% of patients with Chondrosarcoma, 20% of patients with Intrahepatic cholangiocarcinoma, 30% of patients with Angioimmunoblastic T-cell lymphoma and 8% of patients with Myelodysplastic syndromes/Myeloproliferative neoplasms, are associated with IDH mutations. TIBSOVO® is an oral, targeted, small-molecule inhibitor of mutant IDH1. The FDA in July, 2018, approved TIBSOVO® for adult patients with relapsed or refractory AML with a susceptible IDH1 mutation.

The present first line approval by the FDA was based on an open-label, single-arm, multicenter clinical trial (Study AG120-C-001, NCT02074839)of single-agent TIBSOVO®, for newly-diagnosed AML patients, with an IDH1 mutation detected by an FDA-approved IDH1 Assay. In this study, 28 patients were included and these patients were at least 75 years old, or had comorbidities that precluded the use of intensive induction chemotherapy. For comorbidities, enrolled patients met at least one of the following criteria – baseline ECOG PS of 2 or more, severe cardiac or pulmonary disease, hepatic impairment with Bilirubin more than 1.5 times the upper limit of normal, or Creatinine Clearance less than 45 mL/min. The median age was 77 years and 79% had therapy-related AML or AML with Myelodysplasia-related changes. Patients received TIBSOVO® 500 mg orally daily until disease progression, development of unacceptable toxicity, or hematopoietic stem cell transplantation. Efficacy was based on the rate of Complete Remission (CR) or Complete Remission with partial hematologic improvement (CRh) rate, the duration of CR+CRh, and the conversion rate from transfusion dependence to transfusion independence. CRh was defined as less than 5% of blasts in the bone marrow, no evidence of disease, and partial recovery of peripheral blood counts (platelets more than 50,000/microliter and ANC more than 500/microliter).

In this trial, TIBSOVO® demonstrated a CR+CRh rate of 42.9%, with a CR rate of 28.6% and a CRh rate was 14.3%. The median durations of CR and CR+CRh could not be estimated, with 41.7% of those who achieved CR or CRh remaining on TIBSOVO® treatment as of the data cutoff (treatment duration ranged from 20.3 to 40.9 months). At 12 months after receiving treatment, 58.3% of patients who achieved CR or CRh, remained in remission. For those who achieved a CR or CRh, the median time to best response of CR or CRh was 2.8 months. Among those patients who were dependent on RBC and/or platelet transfusions at baseline, 41.2% achieved transfusion independence lasting at least 8 weeks.

The most common adverse reactions were fatigue, nausea, diarrhea, rash, pyrexia, arthralgia, leukocytosis and QT prolongation. One important side effect of the IDH inhibitors is the induction of differentiation of the malignant cells, and in 10-20% of patients, a clinical syndrome known as the IDH differentiation syndrome can occur. The IDH differentiation syndrome should be promptly managed by dose interruption and treatment with glucocorticoids, oral hydroxyurea, or both.

It was concluded that TIBSOVO® can induce durable responses among newly diagnosed poor risk AML patients with an IDH1 mutation, who are ineligible for intensive chemotherapy, fulfilling an unmet need. https://www.fda.gov/drugs/resources-information-approved-drugs/fda-approves-ivosidenib-first-line-treatment-aml-idh1-mutation

Six Prognostic Factors That Predict Invasive Breast Cancer Recurrence after DCIS

RR

SUMMARY: Breast cancer is the most common cancer among women in the US and about 1 in 8 women (12%) will develop invasive breast cancer during their lifetime. Approximately 268,600 new cases of female breast cancer will be diagnosed in 2019 and about 41,760 women will die of the disease. Carcinoma in situ of the breast also known as Ductal Carcinoma In Situ (DCIS) is defined as a malignant proliferation of ductal epithelial cells that are confined to the milk ducts without invasion of the basement membrane, and is a precursor lesion to invasive carcinoma. DCIS accounts for approximately 25% of all newly diagnosed breast cancers. Patients with small, screening-detected lesions, are often treated with breast-conserving surgery (to prevent the development of invasive breast cancer), followed by adjuvant radiation and hormonal therapy, although neither of the latter two interventions have been shown to improve survival outcomes. As such, a significant number of patients are overtreated. There remains a large unmet need, to distinguish relatively benign DCIS from DCIS that will develop into invasive breast cancer.Normal-Milk-Duct DCIS Invasive-Breast-Cancer

The authors in this study performed a systematic review from 1970 to 2018, with meta-analyses of 1,781 articles from the PubMed database, to summarize current knowledge on prognostic factors for invasive disease, after a diagnosis of DCIS. The number of patients in the included studies ranged from 52 to 37,692. Of all the articles reviewed, 40 articles met the inclusion criteria. Eligible studies assessed risk of invasive recurrence in women primarily diagnosed and treated for DCIS, and included at least 10 ipsilateral-invasive breast cancer events and 1 year of follow up. The mean follow up time ranged from 3.2 to 15.8 years. Quality in Prognosis Studies (QUIPS) tool was used for risk-of-bias assessment (A working group comprising epidemiologists, statisticians, and clinicians developed this tool based on previous research and this tool can inform judgements of risk-of-bias in prognostic research). Meta-analyses were performed to estimate the average effect size of the prognostic factors.

The researchers identified six prognostic factors in the meta-analyses that were statistically significant and were associated with a 36% to 84% increase in the relative risk of recurrence of invasive disease after a DCIS diagnosis. These six factors included- 

1) African American race (43% higher risk)

2) Premenopausal status (59% higher risk)

3) Detection by palpation (84% higher risk)

4) Positive margins (63% higher risk)

5) High histologic grade (36% higher risk)

6) High p16 expression (51% higher risk).

Further, the authors identified frequently occurring biases in studies on invasive recurrence after DCIS and the highest risk of bias was attributable to insufficient handling of confounders and poorly described study groups. They added that avoiding these common methodological pitfalls can improve future study designs.

It was concluded that this study results may help clinicians distinguish indolent from potentially aggressive DCIS and prevent overtreatment.

Predictors of an Invasive Breast Cancer Recurrence after DCIS: A Systematic Review and Meta-analyses. Visser LL, Groen EJ, van Leeuwen FE, et al. Cancer Epidemiol Biomarkers Prev. 2019;28:835-845

TIBSOVO® (Ivosidenib)

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The FDA on May 2, 2019 approved TIBSOVO® for newly diagnosed Acute Myeloid Leukemia (AML), with a susceptible IDH1 mutation, as detected by an FDA-approved test, in patients who are at least 75 years old or who have comorbidities that preclude the use of intensive induction chemotherapy. TIBSOVO® was approved in July 2018 for adult patients with relapsed or refractory AML with a susceptible IDH1 mutation. TIBSOVO® is a product of Agios Pharmaceuticals, Inc.

IMBRUVICA® plus GAZYVA® is a Safe and Effective Alternative First Line Treatment Option for CLL Patients with Comorbidities and High Risk Disease

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SUMMARY: The American Cancer Society estimates that for 2019, about 20,720 new cases of Chronic Lymphocytic Leukemia (CLL) will be diagnosed in the US and 3,930 patients will die of the disease. B-cell CLL is the most common type of leukemia in adults, accounting for about 11% of all hematologic malignancies. The FDA in January 2019 approved IMBRUVICA® (Ibrutinib), a Bruton's Tyrosine Kinase Inhibitor, in combination with GAZYVA® (Obinutuzumab) for treatment-naive patients with CLL/Small Lymphocytic Lymphoma (CLL/SLL). This is the first approval of a non-chemotherapy combination regimen for treatment-naive patients with CLL/SLL.

Chronic Lymphocytic leukemia (CLL) is a disease of the elderly, with a median age at diagnosis of 71 years. Given the age at diagnosis, it is not uncommon for these patients to have multiple comorbidities. GAZYVA® is glycoengineered, fully humanized, third generation, type II anti-CD20 antibody (IgG1 monoclonal antibody) that selectivity binds to the extracellular domain of the CD20 antigen on malignant human B cells. By virtue of binding affinity of the glycoengineered Fc portion of GAZYVA® to Fcγ receptor III on innate immune effector cells such as natural killer cells, macrophages and neutrophils, Antibody-Dependent Cell-mediated Cytotoxicity (ADCC) and Antibody-Dependent Cellular phagocytosis is significantly enhanced, whereas it induces very little Complement-Dependent Cytotoxicity. This is in contrast to RITUXAN® (Rituximab), which is a first generation type I, chimeric anti-CD20 targeted monoclonal antibody that kills CLL cells primarily by Complement-Dependent Cytotoxicity and also ADCC. In a previously published study, the combination of GAZYVA® and LEUKERAN® (Chlorambucil) when given to elderly patients with comorbid conditions improved Overall Survival (OS) compared to LEUKERAN® alone, and resulted in higher Response Rates and longer Progression Free Survival (PFS) than RITUXAN® plus LEUKERAN® (NEJM 2014; 370:1101-1110).

IMBRUVICA® (Ibrutinib) is an oral, irreversible inhibitor of BTK and inhibits cell proliferation and promotes programmed cell death (Apoptosis) by blocking B-cell activation and signaling. IMBRUVICA® in phase III trials showed improved PFS and OS when compared to LEUKERAN® alone, in previously untreated, elderly patients with CLL (NEJM 2015; 373:2425-2437).BCR-Signal-Pathways

iLLUMINATE is a multicentre, randomized, open-label, international, Phase III trial which enrolled 229 patients with previously untreated CLL or Small Lymphocytic Lymphoma, either aged 65 years or older and if less than 65 years had at least one of the following criteria: Cumulative Illness Rating Scale (CIRS) more than 6, Estimated Creatinine Clearance of less than 70 mL/min using Cockcroft-Gault equation or del 17p by FISH or TP53 mutation by PCR or Next Generation Sequencing. (CIRS is a tool utilized to assess and quantify burden of comorbidity in individual patients). Patients were randomly assigned 1:1 to receive IMBRUVICA® plus GAZYVA® (N=113) or LEUKERAN® plus GAZYVA® (N=116). IMBRUVICA® plus GAZYVA® regimen consisted of IMBRUVICA® 420 mg PO once daily continuously combined with GAZYVA® 100 mg IV on day 1, 900 mg IV on day 2, 1000 mg IV on day 8, and 15 of cycle 1 and 1000 mg IV on day 1 of subsequent 28-day cycles, for a total of six cycles. LEUKERAN® plus GAZYVA® regimen consisted of LEUKERAN® 0.5 mg/kg PO on days 1 and 15 of each 28-day cycle for six cycles combined with GAZYVA® regimen as described above. Eighty percent (80%) of patients were 65 years or older and the median age was 71 years. Approximately 65% of patients had high-risk genetic abnormalities, 52% of patients had either Rai III or IV disease, with bulky disease at baseline in 27% of IMBRUVICA®-treated patients and 38% of LEUKERAN® treated patients. The Primary Endpoint was Progression Free Survival (PFS) and Secondary endpoints included PFS in High-risk Subpopulation which included those patients with del17p/TP53 mutation or del 11q deletion at baseline and/or unmutated IGHV disease. Patients who progressed on the LEUKERAN®treatment group were allowed by the IRC (Independent Review Committee) to cross over to the IMBRUVICA® treatment group.

At a median follow-up time was 31.3 months, the median PFS was significantly longer in the IMBRUVICA® plus GAZYVA® group compared to the LEUKERAN® plus GAZYVA® group ((median not reached versus 19.0 months (HR=0.23; P<0.0001), with a 77% reduction in the risk of progression or death. Patients with high-risk disease such as those with 17p deletion/TP53 mutation, 11q deletion, or unmutated immunoglobulin heavy chain variable region gene treated with IMBRUVICA® plus GAZYVA® experienced an 85% reduction in risk of progression or death (HR= 0.15). The IRC-evaluated Overall Response Rate was 89% in the IMBRUVICA® plus GAZYVA® group versus 73% in the LEUKERAN® plus GAZYVA® arm. The estimated 30-month PFS was 79% in the IMBRUVICA® plus GAZYVA® group and 31% in the LEUKERAN® plus GAZYVA® group. The most common Grade 3 or 4 adverse events in both treatment groups were neutropenia and thrombocytopenia.

It was concluded that a combination of IMBRUVICA® and GAZYVA® is a safe and effective chemotherapy-free regimen for previously untreated patients with CLL or Small Lymphocytic Lymphoma, independent of high-risk features, and provides an alternative first line treatment option for this patient group. Ibrutinib plus obinutuzumab versus chlorambucil plus obinutuzumab in first-line treatment of chronic lymphocytic leukaemia (iLLUMINATE): a multicentre, randomised, open-label, phase 3 trial. Moreno C, Greil R, Demirkan F, et al. Lancet Oncol. 2019;20:43-56.

KEYTRUDA® versus Chemotherapy as Second-Line Treatment for Advanced Esophageal Cancer

RR

SUMMARY: The American Cancer Society estimates that in 2019, about 17,650 new cases of esophageal cancer will be diagnosed in the US and about 16,080 individuals will die of the disease. It is the sixth most common cause of global cancer death. Squamous Cell Carcinoma is the most common type of cancer of the esophagus among African Americans, while Adenocarcinoma is more common in caucasians. About 20% of patients survive at least 5 years following diagnosis. Patients with advanced esophageal cancer following progression on first line chemotherapy have limited treatment options and have a poor prognosis.

KEYTRUDA® (Pembrolizumab) is a fully humanized, Immunoglobulin G4, anti-PD-1, monoclonal antibody, that binds to the PD-1 receptor and blocks its interaction with ligands PD-L1 and PD-L2. It thereby reverses the PD-1 pathway-mediated inhibition of the immune response and unleashes the tumor-specific effector T cells. KEYTRUDA® in the Phase II KEYNOTE-180 study demonstrated durable responses among heavily pretreated patients with advanced metastatic Adenocarcinoma or Squamous Cell Carcinoma of the Esophagus as well as tumors with PD-L1 Combined Positive Score (CPS) of 10 or higher.

KEYNOTE-181 is a global, open-label, Phase III study which included 628 patients with advanced or metastatic adenocarcinoma or squamous cell carcinoma of the esophagus, or Siewert Type I adenocarcinoma of the esophagogastric junction that had progressed after first-line standard therapy. [Adenocarcinomas arising in the vicinity of the EsophagoGastric Junction are classified (Siewert classification) into adenocarcinoma of the distal esophagus (Type I), true carcinoma of the cardia (Type II) and subcardial carcinoma (Type III)].

Patients were randomized 1:1 to KEYTRUDA® 200 mg Q3W for up to 35 cycles (approximately2 years) or investigator’s choice chemotherapy with Docetaxel 75 mg/m2 IV on day 1 of each 21 day cycle, OR Paclitaxel 80-100 mg/m2 IV on days 1, 8 and 15 of each 28-day cycle, OR Irinotecan 80 mg/m2 IV on day 1 of each 14-day cycle. Randomization was stratified by histology and region (Asia vs rest of world). The majority of patients (N=401; 64%) had Squamous Cell Carcinoma (SCC), and 222 patients had PD-L1 Combined Positive Score (CPS) of 10 or higher. The three Primary end points were Overall Survival (OS) in patients with SCC, patients with PD-L1 CPS of 10 or higher and Intent-To- Treat populations. The median follow up was 7 months.

It was noted that among the patients with a PD-L1 CPS of 10 or higher (35% of the study population), the median Overall Survival was 9.3 months with KEYTRUDA® versus 6.7 months with chemotherapy (HR=0.69; P=0.0074). The 12-month survival rate in this group was 43% versus 20% respectively. In the Squamous Cell Carcinoma subgroup (N=401), the median Overall Survival was 8.2 months with KEYTRUDA® versus 7.1 months with chemotherapy (HR=0.78; P=0.0095). These differences favoring KEYTRUDA® however, did not meet the study’s prespecified statistical boundary. In the Intent-To- Treat population, the median Overall Survival was 7.1 months in each treatment group (HR=0.89; P=0.0560), and was not statistically significant. The Progression Free Survival at 12 months among patients with a PD-L1 CPS of 10 or higher was 21% versus 7% for KEYTRUDA® and chemotherapy, respectively. Further, in this patient group, KEYTRUDA® more than doubled the Response Rates than those achieved with chemotherapy, with a longer median duration of response (9.3 versus 7.7 months respectively). Fewer patients had any grade drug-related adverse events with KEYTRUDA®, compared with chemotherapy.

The authors concluded that KEYTRUDA® significantly improved Overall Survival compared with chemotherapy, as second line therapy for patients with advanced esophageal cancer, with PD-L1 CPS of 10 or higher and also had a more favorable safety profile. They added that these data support KEYTRUDA® as a new second line standard of care for esophageal cancer with PD-L1 CPS of 10 or higher. A Phase III study of KEYTRUDA® plus chemotherapy as first line therapy for advanced esophageal cancer is underway. Pembrolizumab versus chemotherapy as second-line therapy for advanced esophageal cancer: Phase III KEYNOTE-181 study. Kojima T, Muro K, Francois E, et al. J Clin Oncol 37, 2019 (suppl 4; abstr 2)

High Body Fat Level Increases Breast Cancer Risk in Postmenopausal Women with Normal BMI

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There is an approximately 30% increased risk of breast cancer recurrence or death in those who are obese, compared to those with ideal body weight. Obesity is associated with alterations in Insulin/glucose homeostasis, adipokines, and sex hormones, which may all play a role in breast cancer outcomes.
BMI (Body Mass Index) does not discriminate between adiposity and muscle, and individuals deemed healthy based on a normal BMI may still be prone to cardiometabolic disorders due to high levels of visceral fat. It has been reported that approximately 18% of women with normal BMI had excess fat, detected on DEXA scan.
In a recently published article in JAMA Oncology involving 3460 postmenopausal women with normal BMI, there was a 56% increase in the risk of developing ER-positive breast cancer per 5-kg increase in trunk fat, despite a normal BMI. This study concluded that a normal BMI may not be an adequate proxy for the risk of breast cancer in postmenopausal women but high body fat levels and altered levels of circulating metabolic and inflammatory factors may be associated with a higher risk of invasive breast cancer.

Androgen Suppression for 18 Months plus Radiotherapy is an Effective Treatment Option for Locally Advanced Intermediate and High Risk Prostate Cancer

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SUMMARY: Prostate cancer is the most common cancer in American men with the exclusion of skin cancer, and 1 in 9 men will be diagnosed with prostate cancer during their lifetime. It is estimated that in the United States, about 174,650 new cases of Prostate cancer will be diagnosed in 2019 and 31,620 men will die of the disease. The development and progression of prostate cancer is driven by androgens. Androgen Deprivation Therapy (ADT) has therefore been the cornerstone of treatment of advanced prostate cancer and is the first treatment intervention.

The intergroup trial developed by the NCIC Clinical Trials Group, in collaboration with the Medical Research Council and the National Cancer Institute US Cancer Therapy Evaluation Program, concluded that the addition of radiotherapy to Androgen Suppression significantly prolongs Overall and Disease Specific Survival, in patients with locally advanced prostate cancer. The optimal duration of Androgen Suppression along with radiotherapy, in the curative management of locally advanced prostate cancer however remains unclear. Neoadjuvant Androgen Suppression schedules have ranged in duration from 3-8 months and for those patients with high risk disease, post radiotherapy adjuvant androgen suppression therapy schedules have ranged from 6-36 months. The study published by Bolla, et al. (NEJM 2009;360:2516-2527) concluded that a combination of radiotherapy along with 6 months of Androgen Suppression provided inferior survival compared with radiotherapy plus 3 years of Androgen Suppression, in patients with locally advanced prostate cancer. This long duration of Androgen Suppression however can be associated with significant adverse events. The PCS IV trial (Nabid, et al. European Urology 2018;74: 432-441) compared 36 months of Androgen Suppression and radiotherapy with 18 months of Androgen Suppression and radiation therapy and concluded that there was no difference in survival between the two treatment groups, with the 18-month group experiencing a better quality of life. Zoledronic acid is effective in preventing Androgen Suppression-induced bone loss, but its role in preventing castration-sensitive bone metastases in locally advanced prostate cancer has been unclear. Randomized Androgen Deprivation And Radiotherapy trial (RADAR) was conducted to determine whether an intermediate duration of Androgen Suppression would be superior to short-term Androgen Suppression, without compromising quality of life. This study was also designed to evaluate whether bisphosphonate therapy would help reduce some of the adverse effects associated with Androgen Suppression and prevent bone disease progression. RADAR trial is randomized, Phase III, 2 × 2 factorial study, which was designed to assess whether the addition of 12 months of adjuvant Androgen Suppression, 18 months of zoledronic acid, or both, can improve outcomes in men with locally advanced prostate cancer, who receive 6 months of Androgen Suppression and radiotherapy to the prostate gland.

This trial enrolled 1071 men 18 years or older with locally advanced prostate cancer, defined as either T2b-4, N0 M0 tumors or T2a, N0 M0 tumors with a Gleason score was 7 or more, and baseline PSA of 10 μg/L or more. Patients were randomly assigned in a 1:1:1;1 ratio to four treatment groups, but all patients following randomization received 6 months of neoadjuvant Androgen Suppression with Leuprolide 22.5 mg IM every 3 months, and radiotherapy to the prostate and seminal vesicles five months after randomization. The four treatment groups were 1) STAS or Short-Term Androgen Suppression which was the control group (N=268), in which patients received 6 months of neoadjuvant Androgen Suppression with Leuprolide 22.5 mg IM every 3 months, and radiotherapy to the prostate and seminal vesicles 2) ITAS or Intermediate-Term Androgen Suppression (N=268), in which STAS was followed by an additional 12 months of adjuvant Androgen Suppression (total of 18 months) with Leuprolide 22.5 mg IM every 3 months 3) STAS plus 18 months of Zoledronic acid 4 mg IV every 3 months, starting at randomization (N=268) 4) ITAS plus Zoledronic acid (N=267). The Primary endpoint was prostate cancer-specific mortality. Secondary endpoints included PSA progression, local progression and distant progression. The median follow up was 10.4 years. Because no interactions were observed between Androgen Suppression and Zoledronic acid at this 10 year follow up, treatment groups were collapsed and 6 months of Androgen Suppression (STAS) plus radiotherapy was compared with 18 months of Androgen suppression (ITAS) plus radiotherapy and groups receiving or not receiving treatment with Zoledronic acid, were compared.

It was noted that the use of additional 12 months of adjuvant Androgen Suppression (total of 18 months) resulted in a significant improvement in prostate cancer specific mortality compared to 6 months of Androgen Suppression and radiotherapy (9.7% versus 13.3% respectively), representing an absolute difference of 3.7% (sub-HR=0.70, adjusted P=0.035). The addition of Zoledronic acid did not have an impact on prostate cancer-specific mortality.

The authors concluded that 18 months of Androgen Suppression plus radiotherapy is a more effective treatment option for locally advanced intermediate and high risk prostate cancer patients, than 6 months of Androgen Suppression plus radiotherapy. It was also concluded that the addition of Zoledronic acid to this treatment regimen does not improve outcomes. Short-term androgen suppression and radiotherapy versus intermediate-term androgen suppression and radiotherapy, with or without zoledronic acid, in men with locally advanced prostate cancer (TROG 03.04 RADAR): 10-year results from a randomised, phase 3, factorial trial. Denham JW, Joseph D, Lamb DS, et al. Lancet Oncol 2019;20:267-281

High Body Fat Level Increases Breast Cancer Risk in Postmenopausal Women with Normal BMI

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SUMMARY: Breast cancer is the most common cancer among women in the US and about 1 in 8 women (12%) will develop invasive breast cancer during their lifetime. Approximately 268,600 new cases of female breast cancer will be diagnosed in 2019 and about 41,760 women will die of the disease. Obesity is an important contributing factor to postmenopausal breast cancer incidence and mortality. Based on recently published meta-analysis, in women diagnosed with breast cancer, there is an approximately 30% increased risk of disease recurrence or death in those who are obese, compared to those with ideal body weight. Increasing physical activity may lower the risk of breast cancer recurrence. According to the consensus from the St Gallen Consensus Conference in 2015, obesity has been associated with poor breast cancer outcomes. Obesity is associated with alterations in Insulin/glucose homeostasis, adipokines, and sex hormones, which may all play a role in breast cancer outcomes. Weight loss can lead to reductions in C-reactive protein, Insulin, glucose, and Leptin. These mediators have all been implicated to have prognostic significance in breast cancer.

Body Mass Index (BMI) measures body size and is calculated based on height and weight. It is used as a measure of obesity. BMI however does not discriminate between adiposity and muscle and individuals deemed healthy based on a normal BMI may still be prone to cardiometabolic disorders due to high levels of visceral fat. Dual-energy X-ray absorptiometry (DXA or DEXA) is often utilized to measure bone mineral density and is the most accurate method presently available for the diagnosis of osteoporosis and to estimate fracture risk. DEXA scan can also be used to measure total body composition and fat content including the amount of visceral fat, with a high degree of accuracy by its ability to break down fat, bone and muscle tissue. It has been reported that approximately 18% of women with normal BMI had excess fat, detected on DEXA scan.

There are two types of adipose tissue in the human body, White Adipose Tissue (WAT) and Brown Adipose Tissue (BAT) which have antagonistic functions. White Adipose Tissue or white fat cells represent the body’s main type of fat tissue and each fat cell has a single lipid droplet. They are distributed in the subcutaneous tissue, around a person's waist and thighs and around internal organs (visceral fat). WAT stores excess energy as triglycerides and serves as an energy reservoir. Brown Adipose tissue (BAT) which is abundant in small mammals and in newborns generates heat by burning calories and helps them to survive cold temperatures. Brown adipocytes contain several small lipid droplets, and a high number of iron-containing mitochondria which gives brown fat its dark tan color. Most BAT is distributed in the lower neck and interscapular area of an adult, and above the collarbone. Higher quantities of BAT are associated with lower body weight and BAT decreases and body weight increases with increasing age.

Leptin is a hormone produced primarily by adipose tissue and circulating Leptin levels correlate with the body fat stores, with increased circulating Leptin levels noted in individuals with excess adiposity. Leptin can induce Aromatase which synthesizes estrogen, can directly stimulate cancer cell proliferation and survival, and activate Estrogen Receptor α via ligand-independent mechanism.Obesity-and-Breast-Cancer

The increased risk of postmenopausal breast cancer in women with normal BMI is poorly understood. Recent studies have shown that in these women with normal BMI, excess body fat is associated with adipocyte hypertrophy which correlates with WAT inflammation, increased circulating Leptin levels, elevated levels of Aromatase and elevated Insulin levels. Dysregulation of Insulin signaling can activate the PI3K/Akt/mTOR and Ras/Raf/MAPK pathways which in turn can enhance cell proliferation and increase the risk of breast cancer. Further, Insulin also induces insulin like growth factor-1 (IGF-1), which can activate ERα. Insulin resistance leads to reduced levels of sex hormone–binding globulin, resulting in elevated levels of free estradiol. It has been suggested that all of these changes collectively may play a role in the pathogenesis of obesity-related breast cancer. The present study was conducted to investigate the association between body fat and breast cancer risk in women with normal BMI.

The authors in this long-term prospective study examined the association between body fat mass, measured by DEXA scan, and the risk of breast cancer, in a secondary analysis of 3460 postmenopausal women with normal BMI (18.5-24.9), enrolled in the Women’s Health Initiative (WHI) clinical trials or observational study. The goal of this study was to understand whether excess adipose tissue is associated with an increased breast cancer risk in women with normal BMI. Participants 50-79 years old with a mean age of 64 years underwent body fat measurement (the percentage of whole-body fat, trunk fat, and fat mass in both legs) with DEXA scan at 3 US designated centers at the time of study entry into the WHI clinical trials, and years 1, 3, 6, and 9. Levels of Insulin, glucose, C-reactive protein, interleukin-6, triglycerides, HDL cholesterol, estradiol, sex hormone-binding globulin, adiponectin, and Leptin were measured in 3-13% of participants using baseline fasting blood specimens.

At a median follow up of 16 years, 182 incident breast cancers were confirmed, and 146 (80%) were ER positive. It was noted that among postmenopausal women with normal BMI, relatively high body fat levels were associated with an elevated risk of invasive breast cancer. The authors specifically, found a 56% increase in the risk of developing ER-positive breast cancer per 5-kg increase in trunk fat, despite a normal BMI. Elevated trunk fat levels were also associated with metabolic dysregulation and inflammation characterized by increased circulating levels of Insulin, Leptin, C-reactive protein, Interleukin 6 and triglycerides, whereas levels of HDL cholesterol and sex hormone–binding globulin were lower.

It was concluded from this large prospective study that normal BMI may not be an adequate proxy for the risk of breast cancer in postmenopausal women. High body fat levels and altered levels of circulating metabolic and inflammatory factors may be associated with a higher risk of invasive breast cancer. Association of Body Fat and Risk of Breast Cancer in Postmenopausal Women with Normal Body Mass Index. A Secondary Analysis of a Randomized Clinical Trial and Observational Study. Iyengar NM, Arthur R, Manson JE, et al. JAMA Oncol. 2019;5:155-163

KEYTRUDA® and INLYTA®

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The FDA on April 19, 2019, approved KEYTRUDA® (Pembrolizumab) plus INLYTA® (Axitinib) for the first-line treatment of patients with advanced Renal Cell Carcinoma (RCC). KEYTRUDA® is a product of Merck & Co. Inc. and INLYTA® is a product of Pfizer Inc.

FDA Approves BALVERSA® for Metastatic Urothelial Carcinoma

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SUMMARY: The FDA on April 12, 2019 granted accelerated approval to BALVERSA® (Erdafitinib) for patients with locally advanced or metastatic Urothelial Carcinoma, with susceptible FGFR3 or FGFR2 genetic alterations,that has progressed during or following platinum-containing chemotherapy, including within 12 months of neoadjuvant or adjuvant platinum-containing chemotherapy. Patients should be selected for therapy based on an FDA-approved companion diagnostic for BALVERSA®. The FDA also simultaneously approved the THERASCREEN® FGFR RGQ RT-PCR Kit, developed by QIAGEN, for use as a companion diagnostic for this therapeutic indication.

FGFR-Signaling-PathwayFGFRs are a family of Receptor Tyrosine Kinases, which may be upregulated in a variety of malignancies. The Fibroblast Growth Factor/Fibroblast Growth Factor Receptor (FGF/FGFR) signaling pathway regulates embryogenesis, adult tissue homeostasis, angiogenesis and wound repair, and is also pivotal in cell functions, including proliferation, differentiation, apoptosis and migration. Deregulated FGF/FGFR activations have been associated with developmental disorders and cancer progression. Following binding with a ligand, FGFRs activate downstream signaling pathways such as the Mitogen Activated Protein Kinase (MAPK), Signal Transducer and Activator of Transcription (STAT), the PhosphoInositide-3-Kinase (PI3K)/Akt pathways, and PLC-DAG-PKC pathway. FGFR isoforms have been shown to result in oncogenic FGFR signaling, which in turn promotes tumorigenesis. FGFR3 mutations have been described in approximately 75% of low-grade papillary bladder cancers, and FGFR3 overexpression has been noted in 42% of muscle-invasive bladder cancers. FGFR1 amplification has also been found in 3% of urinary bladder cancers. Patients with FGFR alterations have poor outcomes when treated with available therapies and these alterations occur in 20% of patients with metastatic Urothelial Carcinoma.

BALVERSA® (Erdafitinib) is a once-daily, oral, pan-Fibroblast Growth Factor Receptor (FGFR) Tyrosine Kinase Inhibitor. The approval of BALVERSA® was based on data from a cohort of 87 patients, enrolled in Study BLC2001, which is a multicenter, open-label, single-arm trial. Enrolled patients had locally advanced or metastatic Urothelial Carcinoma that had progressed during, or following at least one prior chemotherapy regimen, and had FGFR genomic alterations such as FGFR3 gene mutations or FGFR2 or FGFR3 gene fusions. Ten percent of patients were chemo naïve, 47% percent of patients had received two or more prior lines of therapy and 80% of patients had visceral metastases. Approximately 97% patients had prior Platinum based therapy and 24% of patients had received anti–PD-1/PD-L1 treatment. The median patient age was 67 years. Patients received BALVERSA® at a starting dose of 8 mg PO once daily. Patients whose serum phosphate levels were below the target of 5.5 mg/dL between days 14 and 17 (41% of the patients) had their dose increased to 9 mg once daily. Treatment was continued until disease progression or unacceptable toxicity. The Primary end point was Objective Response Rate (ORR).

The ORR was 32.2%, with Complete Responses in 2.3% and Partial Responses in 29.9%. Median response duration was 5.4 months. Responding patients included those patients who had previously not responded to anti PD-L1 or PD-1 treatment. The most common adverse reactions were increased serum phosphate, stomatitis, fatigue, increased serum creatinine, diarrhea, onycholysis, increased liver function studies and hyponatremia.

The authors concluded that treatment with BALVERSA® resulted in high Response Rates among patients with chemorefractory metastatic Urothelial Carcinoma with FGFR genomic alterations. BALVERSA® is the first approved personalized treatment, targeting susceptible FGFR genetic alterations, fulfilling an unmet need for these poor prognosis patients. First results from the primary analysis population of the phase 2 study of erdafitinib (ERDA; JNJ-42756493) in patients (pts) with metastatic or unresectable urothelial carcinoma (mUC) and FGFR alterations (FGFRalt). Siefker-Radtke AO, Necchi A, Park SH, et al. J Clin Oncol 36, 2018 (suppl; abstr 4503)