Annual Meeting Proceedings Part 1 - American Society of Clinical ...
Annual Meeting Proceedings Part 1 - American Society of Clinical ...
Annual Meeting Proceedings Part 1 - American Society of Clinical ...
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1596 General Poster Session (Board #8F), Sat, 1:15 PM-5:15 PM<br />
ABO blood group and the risk <strong>of</strong> lung cancer: Multicenter, case-control,<br />
observational study. Presenting Author: Gungor Utkan, Ankara University<br />
School <strong>of</strong> Medicine, Ankara, Turkey<br />
Background: The role <strong>of</strong> genetic factors in the development <strong>of</strong> cancer is<br />
widely accepted. Previous studies have observed an association between<br />
ABO blood group and risk <strong>of</strong> certain malignancies, including pancreatic<br />
and gastric cancer. The data on the role <strong>of</strong> ABO blood group and Rh factor<br />
in lung cancer is limited. Methods: All patients who had Lung cancer (LC)<br />
and treated between 2000-2011 at the involved centers with defined<br />
ABO/Rh were included in our retrospective reviews <strong>of</strong> tumor registry<br />
records. A group <strong>of</strong> volunteer healthy blood donors <strong>of</strong> Turkish Red Crescent<br />
between 2004 and 2011 were identified as a control group. The relationship<br />
<strong>of</strong> ABO/Rh with clinical features such as age at diagnosis, histological<br />
subtype and sex were evaluated. We compared the distributions <strong>of</strong> ABO/Rh<br />
among 1954 patients and 3,022,883 controls. Among LC patients,<br />
differences between each <strong>of</strong> aforementioned ABO/Rh groups with respect<br />
to various clinical features were explored, respectively. Results: Of these<br />
patients the median age was 62 (range: 17-90). The 84% <strong>of</strong> patients were<br />
male. Overall distributions <strong>of</strong> ABO blood groups as well as Rh factor were<br />
statistically different between patients (43.6% A, 8.3% AB, 17.3% B,<br />
30.8% O, and 86.3% Rh�) and controls (42.2% A, 7.6% AB, 16.3% B,<br />
33.9% O, and 87.7% Rh�) (p�0,03). In addition, there were statistically<br />
significant differences between patients and controls with respect to O vs.<br />
nonO (p�0.004) and marginal significance for A vs. nonA (p�0,065), B vs.<br />
nonB (p�0,076), and Rh� vs. Rh- (p�0,057). Among patients, there<br />
weren’t statistically significant differences between blood group with<br />
respect to sex and age. However there was statistically significant difference<br />
between blood group with respect to histology (p�0,001). Although<br />
the distribution <strong>of</strong> A and O were similar according to histology, patients with<br />
squamous histology had antigen B more frequently than other histological<br />
sub types (p�0,009). Conclusions: In the study populations, ABO blood<br />
type was statistically significantly associated with the LC and having blood<br />
type other than O increases the risk <strong>of</strong> LC. Further studies are necessary to<br />
define the mechanisms by which ABO blood type may influence breast<br />
cancer risk.<br />
1598 General Poster Session (Board #8H), Sat, 1:15 PM-5:15 PM<br />
Analyzing excess mortality from cancer among individuals with mental<br />
illness. Presenting Author: Jackson S. Musuuza, Department <strong>of</strong> Population<br />
Health Sciences, University <strong>of</strong> Wisconsin School <strong>of</strong> Medicine and Public<br />
Health, Madison, WI<br />
Background: Previous studies have documented higher cancer-related<br />
mortality in individuals with mental illness, compared to their healthier<br />
counterparts. The aim <strong>of</strong> this study was to identify the anatomic cancer<br />
sites for which mortality is higher in individuals with mental illness.<br />
Methods: We used a linked dataset comprised <strong>of</strong> death certificate data for<br />
the state <strong>of</strong> Ohio for the years—2004-2007 and data from the publicly<br />
funded mental health system in Ohio. Decedents with mental illness were<br />
those identified concomitantly in both data sets. We used age-adjusted<br />
standardized mortality ratios (SMRs) in race- and sex-specific strata to<br />
estimate excess deaths for each <strong>of</strong> the anatomic cancer sites. Results:<br />
Overall, there was excess mortality from cancer associated with having<br />
mental illness in Non-Black men and women (SMR: 1.14 (95% confidence<br />
interval [CI] � 1.05-1.22), and 1.13 (95% CI� 1.05-1.20, respectively),<br />
but lower mortality in Black men, likely due to premature mortality from<br />
other causes (0.71 (95% CI� 0.61-0.83). In Black women, we observed<br />
no excess mortality from cancer that was associated with having mental<br />
illness. There was excess mortality from hepatobiliary cancer in Non-Black<br />
men (SMR� 1.65; 95% CI �1.15-2.29), but not in any other sex- and<br />
race- stratum. In addition, we observed excess mortality from lung and<br />
laryngeal cancers among Non-Black men and women (SMRs for lung<br />
cancer <strong>of</strong> 1.28 (95% CI� 1.13-1.45), and 1.45 (95% CI� 1.29-1.62),<br />
respectively; and for laryngeal cancer (2.01 (95% CI� 1.19-3.18 for men,<br />
and 2.47 (95% CI� 1.08-4.89) for women). Black women experienced<br />
excess mortality from cancer <strong>of</strong> the kidney and renal pelvis (SMR� 2.91;<br />
95% CI �1.53-5.06), while Non-Black women experienced excess mortality<br />
from urinary bladder cancers (SMR�1.89; 95% CI�1.15- 2.92).<br />
Conclusions: Compared to the general population in Ohio, individuals with<br />
mental illness experienced excess mortality from certain cancers. In part,<br />
this excess mortality may be mediated by a higher prevalence <strong>of</strong> smoking or<br />
substance abuse in individuals with mental illness. Further investigation is<br />
needed to explain the observed racial variation in cancer mortality, and to<br />
examine mortality for specific cancers based on severity <strong>of</strong> mental illness.<br />
Cancer Prevention/Epidemiology<br />
109s<br />
1597 General Poster Session (Board #8G), Sat, 1:15 PM-5:15 PM<br />
Association <strong>of</strong> p53 Arg72Pro polymorphism and HPV status with the<br />
initiation, progression, and development <strong>of</strong> cervical cancer (CC): A metaanalysis.<br />
Presenting Author: Steven Habbous, Princess Margaret Hospital,<br />
Toronto, ON, Canada<br />
Background: CC develops through progression from normal cervical epithelium<br />
through squamous intra-epithelial lesions (SILs) to cancer. CC is<br />
classically associated with oncogenic human papillomavirus (HPV). Yet,<br />
not all CC patients demonstrate HPV infection at diagnosis. HPV� and<br />
HPV– subsets <strong>of</strong> CC patients may thus represent distinct entities. HPV<br />
binds to P53, promoting its degradation; the Arg variant <strong>of</strong> p53 Arg72Pro<br />
binds more ardently to HPV than the Pro variant. Although there have been<br />
meta-analyses <strong>of</strong> Arg72Pro in CC risk, none has evaluated the relationship<br />
between Arg72Pro and HPV status together. We hypothesize that p53<br />
Arg72Pro modifies aspects <strong>of</strong> the carcinogenic process in HPV� (but not<br />
HPV-) subsets <strong>of</strong> CC. Methods: Pubmed/Embase databases identified 1494<br />
potential studies; 51 were eligible and included. Separate analyses were<br />
performed to evaluate CC risk (CC vs normal), initiation <strong>of</strong> cancer (SIL vs<br />
normal), and progression towards cancer (CC vs SIL), by HPV status. Pooled<br />
odds ratios (pOR) were generated using RevMan 5.1 s<strong>of</strong>tware. Results: p53<br />
Arg72Pro was not associated with CC risk in either HPV� or HPV- patient<br />
subsets (pORs 0.92; 95%CI, 0.6-1.3 and pORs 1.07; 95%CI, 0.7-1.7,<br />
respectively). Similarly, there was no association with the initiation <strong>of</strong><br />
disease (SIL vs normal): pORs 0.96; 95%CI, 0.7-1.3 (HPV� subset);<br />
1.11; 95%CI, 0.9-1.4 (HPV- subset). There was no association with<br />
disease progression from SIL to CC in the HPV- subset (pOR, 0.98; 95%CI,<br />
0.7-1.4). However, in the HPV� subset, comparing the progression from<br />
SIL through to CC, there was strong and significant association: pOR, 1.37;<br />
95%CI, 1.2-1.6 (p�4.0x10E-4), with no evidence <strong>of</strong> heterogeneity (I2 �<br />
0%) or bias (by funnel plot). Sensitivity analyses demonstrated similarly<br />
significant results, even after taking into account differing quality <strong>of</strong><br />
methodological designs and type <strong>of</strong> biological sample analyzed (tumour vs.<br />
blood) <strong>of</strong> the underlying studies. Associations were mainly restricted to<br />
Caucasian studies. Conclusions: In this meta-analysis, the Arg variant <strong>of</strong><br />
p53 Arg72Pro was associated with progression <strong>of</strong> SIL to CC only in HPV�<br />
subsets, but not to disease initiation or risk <strong>of</strong> CC.<br />
1599 General Poster Session (Board #9A), Sat, 1:15 PM-5:15 PM<br />
Analysis <strong>of</strong> KRAS and BRAF mutant colorectal cancers in a multiracial<br />
population. Presenting Author: Jared David Acoba, University <strong>of</strong> Hawaii<br />
Cancer Center, Honolulu, HI<br />
Background: We previously demonstrated racial disparities in colorectal<br />
cancer (CRC) survival despite adjustments for tumor and socioeconomic<br />
factors. Molecular differences in breast and lung tumors contribute to<br />
racial survival inequality, yet in CRC, molecular tumor characteristics have<br />
not been studied extensively in a racially diverse cohort. We performed a<br />
comprehensive evaluation <strong>of</strong> KRAS and BRAF mutations in a multiracial<br />
population to determine the prevalence in CRC and the degree to which<br />
these molecular traits impact survival. Methods: A retrospective cohort<br />
study <strong>of</strong> patients diagnosed with CRC between 2008 and 2011 from<br />
hospital tumor registries was performed. The prevalence <strong>of</strong> KRAS and<br />
BRAF mutations was determined for the study population and individual<br />
racial groups. Multivariable Cox proportional hazards regression models for<br />
survival were built for KRAS and BRAF mutation status while adjusting for<br />
age at diagnosis, race, and stage <strong>of</strong> disease. Results: Of 706 patients<br />
diagnosed with CRC, KRAS mutational analysis was performed on 148<br />
subjects. 14% <strong>of</strong> subjects were white (W), 64% Asian (A), and 21% Native<br />
Hawaiian/Pacific Islander (NH). KRAS mutation was identified in 48<br />
subjects (32%). The prevalence <strong>of</strong> mutant tumors among racial groups was<br />
W 33%, A 36%, and NH 30%. Analysis for KRAS G13D mutations revealed<br />
a prevalence <strong>of</strong> W 11%, A 9%, and NH 7%. When compared to published<br />
datasets <strong>of</strong> predominantly white patients, our multiracial cohort had a<br />
significantly higher rate <strong>of</strong> KRAS G13D mutant tumors, p�0.039. Of 74<br />
subjects tested for the BRAF mutation, two mutant tumors were detected<br />
(3%). The prevalence <strong>of</strong> the BRAF mutation by race was 10% W, 3% A, and<br />
0% NH (p�0.18). BRAF and KRAS G13D mutations were adverse<br />
prognostic factors in a multivariate analysis, although the odds ratios failed<br />
to meet statistical significance. Conclusions: The prevalence <strong>of</strong> BRAF and<br />
KRAS mutations in this multiracial cohort is similar to what has been<br />
previously reported. However the rates <strong>of</strong> KRAS G13D and BRAF mutant<br />
tumors in our cohort are higher than prior reports. Furthermore, KRAS<br />
G13D which has been postulated to be a favorable prognostic factor for<br />
CRC, may adversely impact survival <strong>of</strong> minority patients.<br />
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