Smoke Like a Man, Survive Like a Woman
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1 Smoke Like a Man, Survive Like a Woman Sex Specific Differences in Lung Cancer Pulmonary Grand Rounds Philippe R. Montgrain, M.D. May 1, 2008
2 Objectives 1. Review how lung cancer differs in men and women. 2. Present research on parathyroid hormonerelated protein (PTHrP), a sex dependent protein that slows lung carcinoma growth and prolongs survival.
3 Impact of Lung Cancer Kills more men and women each year than any other cancer. 90,810 deaths in men and 71,030 deaths in women expected in year survival remains dismally low, only 15%.
4 Recent Media Attention
5 Copyright 2008 American Cancer Society Ten Leading Cancer Types for the Estimated New Cancer Cases and Deaths, by Sex, United States, 2008 From Jemal, A. et al. CA Cancer J Clin 2008;58:71 96.
6 Copyright 2008 American Cancer Society Annual Age adjusted Cancer Death Rates* Among Males for Selected Cancers, United States, 1930 to 2004 From Jemal, A. et al. CA Cancer J Clin 2008;58:71 96.
7 Copyright 2008 American Cancer Society Annual Age adjusted Cancer Death Rates* Among Females for Selected Cancers, United States, 1930 to 2004 From Jemal, A. et al. CA Cancer J Clin 2008;58:71 96.
8 Lung Cancer in US Women: A Contemporary Epidemic Age adjusted death rates for lung cancer and breast cancer among women in the United States, (O'Keeffe, Semin Oncol Nurs 2008).
9 Equal Opportunity Killer
10 Recent Media Attention
11 Recent Media Attention
12 The Main Culprit
13 Smoke Like a Man, Die Like a Man Baldini and Strauss, CHEST 1997
14 It is not that simple There is mounting interest in sex specific differences in lung cancer. Does histology vary with sex? Does the risk for lung cancer differ between men and women? Are there genetic or molecular differences? Does response to therapy differ? Are outcomes different between men and women?
15 Histology Varies with Sex Novello and Baldini, Ann Oncol 2006
16 Histology Varies with Sex
17 Lung Adenocarcinoma Association with smoking is less strong. Most common type of lung cancer in young persons. Most common in women of all ages. Most common in never smokers. Estrogens may play a role in lung adenocarcinoma tumorigenesis.
18 Estrogens and Lung Adenocarcinoma A case control study showed that early age at menopause is associated with a reduced risk of adenocarcinoma of the lung. The use of estrogen therapy is associated with a higher risk of adenocarcinoma. A positive interaction exists between estrogen therapy, smoking, and the development of lung adenocarcinoma. Taioli, JNCI 1994
19 Lung Cancer Risk Varies with Sex Women appear to be at higher risk for lung cancer: A case control study of 800 patients with lung cancer found that the OR of lung cancer for those with a 40 pack year history was 27.9 in women vs. 9.6 in men. Another case control study of nearly 15,000 lung cancer patients demonstrated a higher OR for women (12.7) than for men (9.1). Risch, Am J Epidemiol 1993 Brownson, Epidemiology 1992
20 Lung Cancer Risk Varies with Sex An American Health Foundation case control study including 1108 men and 781 women with lung cancer found that, given the same exposure to cigarette smoke, women had 1.5 fold higher RR of developing lung cancer than men. In contrast, several cohort studies have not shown a higher RR of lung cancer in female smokers (studies may have suffered from lack of adjustment for duration of cigarette smoke exposure). Zhang, JNCI 1996 US Department of Health and Human Services, 2001
21 Latest Data from Early Lung Cancer Action Project Relative risk, women vs. men, corrected for age and smoking history International Early Lung Cancer Action Program Investigators, JAMA 2006
22 Genetic and Molecular Differences DNA repair capacity DNA adducts p53 mutations K ras mutations Cytochrome P450 enzyme CYP1A1 Gastrin releasing peptide receptor Estrogen
23 Women Have Less DNA Repair Capacity Wei et al studied lymphocytes from patients with lung cancer. Lymphocytes were transfected with a plasmid containing a reporter gene that is not expressed if plasmid DNA is damaged. Lymphocytes were then exposed to the carcinogen benzo(a)pyrene diolepoxide. Females had a lower DNA repair capacity compared to males. Wei, JNCI 2000
24 Women Have More DNA Adducts Pro carcinogens from tobacco smoke are activated to reactive intermediates by cytochrome P450 enzymes CYP1A1 and CYP1B1. These reactive intermediates bind to DNA in lung epithelial cells forming DNA adducts. Attempts to repair these adducts can lead to mutations and cancer. Women have higher levels of these DNA adducts when compared to men. Cheng, Environ Mol Mutagen 2001 Kure, Carcinogenesis 2001 Mollerup, Cancer Res 1999
25 Women Make More CYP1A1 Women Men P value Smoking history (pack years) x 10 5 Age DNA adducts (per 10 8 DNA bases) CYP1A1 mrna/10 6 GAPDH mrna Mollerup, Cancer Res 1999
26 Women Have More p53 and K ras Mutations p53 is a tumor suppressor that causes arrest in both G 1 and G 2 in response to DNA damage, allowing for DNA repair or apoptosis. Female smokers have more p53 mutations than male smokers. K ras is an proto oncogene often associated with adenocarcinoma. Women are three times more likely to carry K ras mutations than men. Kure, Carcinogenesis 1996 Nelson, JNCI 1999
27 Women Make More GRPR Gastrin releasing peptide stimulates cell proliferation and has been implicated in lung cancer. Its receptor, GRPR, is encoded on chromosome X and escapes X inactivation. Women express more GRPR than men. Shriver, JNCI 2000
28 Estrogen May Not Help Either Estradiol increases proliferation of lung cancer cell lines in vitro (Stabile, Cancer Res 2002). Hormone replacement therapy is associated with a higher risk of lung cancer (RR=1.26) (Adami, Int J Cancer 1989).
29 Response to Therapy Can Vary with Sex Women have better responses to platinum based chemotherapy. Paradoxically, this may be due to decreased DNA repair capacity since these agents work by causing DNA damage in rapidly dividing cells. Women have better responses to the tyrosine kinase inhibitors, erlotinib and gefitinib. This could be due to the fact that women more often have activating mutations in the tyrosine kinase domain of EGFR.
30 Women Are Survivors No matter the stage: Surveillance, epidemiology and end results (SEER) data base Fast Stats: lung and bronchus cancer.
31 Women Are Survivors No matter the treatment: Novello and Baldini, Ann Oncol 2006
32 Women Survive Longer After Surgery Lung Cancer 47: , 2005
33 Women Develop Cancer More Readily, but Have Better Outcomes than Men
34 Survival Advantage in Women The reason why women with lung cancer have better outcomes than men with lung cancer is unknown. Research from our laboratory suggests that parathyroid hormone related protein may play a role.
35 PTHrP Parathyroid hormone related protein (PTHrP) was discovered as the tumor derived product associated with humoral hypercalcemia of malignancy (HHM). It is expressed in a wide variety of malignant and normal tissues. Named for homology between its amino terminus, PTHrP 1 34, and the comparable portion of parathyroid hormone (PTH). PTHrP binds the same receptor as PTH, with equal affinity.
36 PTHrP and Lung Cancer PTHrP is expressed by about 66% of non small cell lung carcinomas (NSCLC) (Clin Cancer Res 2006; 12: ). It has effects on cell growth and differentiation, apoptosis sensitivity and matrix interactions, actions that could affect cancer progression.
37 PTHrP Decreases Lung Cancer Cell Proliferation
38 Does PTHrP Regulate Lung Carcinoma Growth? Animal model: We implanted 3 million human lung cancer cells into the lungs of athymic mice Cancer cells expressed the fluorescent protein DsRed Treated mice with neutralizing antibody to PTHrP or isotype control Estimated tumor burden based on tumor DsRed fluorescence
39 Orthotopic Lung Cancer Model
40 Endogenous PTHrP Slows Lung Carcinoma Growth Hastings, Cancer 92: , 2001
41 Does PTHrP Impact Survival? Patients undergoing surgery for non small cell lung carcinoma Stain lung carcinomas for PTHrP Analyze survival based on PTHrP status, demographic data and cancer specifics
42 PTHrP positive PTHrP negative adenocarcinoma squamous carcinoma large cell carcinoma
43 PTHrP Survival Benefit in Women Hastings et al. Clin Cancer Research 12:499, 2006
44 Tumors in Females Make More PTHrP than in Males Montgrain et al, Cancer 2007
45 Sex Steroid Receptors in Lung Cancer Cells The differential expression of PTHrP between males and females could be due to effects of sex steroids. Lung tumors are known to express the receptors for androgens and estrogens.
46 Androgens Inhibit PTHrP in Cultured Lung Cancer Cells Montgrain et al, Cancer 2007
47 Androgens Decrease Lung Tumor PTHrP in vivo Montgrain et al, Cancer 2007
48 PTHrP Varies with Sex PTHrP is associated with prolonged survival in females but not males. Lung carcinoma PTHrP levels are higher in females than in males Androgens decrease tumor PTHrP in vitro and in vivo What about effects of sex steroids on PTHrP receptor?
49 Estradiol Increases PTHrP Receptor
50 Testosterone Decreases PTHrP Receptor
51 PTHrP Could Have Effects on Surrounding Lung Tissue Endothelial cells express PTHrP receptor PTHrP is associated with decreased angiogenesis during endochondral bone development Bakre and Varner (2002) demonstrated that PTHrP regulated angiogenesis
52 PTHrP Reduces Angiogenesis in Prostate Cancer Bakre, Nature Med 2002
53 PTHrP Reduces Angiogenesis in Orthotopic Lung Carcinomas
54 PTHrP and Survival PTHrP slows lung cancer growth, possibly by inhibiting angiogenesis. PTHrP is associated with prolonged survival in women with lung cancer, but not men. Androgens decrease PTHrP and PTHrP receptor levels in males, which may result in the loss of a survival benefit. Does treatment with exogenous PTHrP slow lung carcinoma growth in male mice?
55 Exogenous PTHrP Slows Tumor Growth in Males Cell Line Sex Treatment Tumor Mass Tumor Total Protein Tumor Fluorescence Tumor Image Area Tumor Image Sum Intensi ty Tumor IL 8 Serum IL 8 (g) (mg/ml) (RFU) (pixels) (kilovoxels) (pg/ml) (pg/ml) BEN Male PBS 0.25 ± ± ± ± ± ± ± 57 (n = 6) PTHrP ± ± ± ± ± ± ± 19 (n = 6) P value
56 Conclusions Numerous sex specific differences exist in lung cancer. Women appear to be at higher risk of developing lung cancer, but then have better outcomes regardless of stage or treatment modality. The cause of women s survival advantage in lung cancer is currently unknown. PTHrP may play a role. The protein slows lung carcinoma growth and inhibits angiogenesis, and women make more PTHrP and PTHrP receptor due to the effects of sex steroids.
57 Acknowledgements Hastings Research Group Randolph Hastings, M.D., Ph.D. Rick Quintana Yvette Rascon Erin Healy
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