Risks of second primary cancer among patients with major histological types of lung cancers in both men and women.
BACKGROUND
Patterns of second primary cancers (SPCs) following first primary lung cancers (FPLCs) may provide aetiological insights into FPLC.


METHODS
Cases of FPLCs in 13 cancer registries in Europe, Australia, Canada, and Singapore were followed up from the date of FPLC diagnosis to the date of SPC diagnosis, date of death, or end of follow-up. Standardised incidence ratios (SIRs) were calculated to estimate the magnitude of SPC development following squamous cell carcinoma (SCC), small cell lung carcinoma (SCLC), and adenocarcinoma (ADC).


RESULTS
Among SCC patients, male SIR=1.58 (95% confidence interval (CI)=1.50-1.66) and female SIR=2.31 (1.94-2.72) for smoking-related SPC. Among SCLC patients, the respective ratios were 1.39 (1.20-1.60) and 2.28 (1.73-2.95), and among ADC patients, they were 1.73 (1.57-1.90) and 2.24 (1.91-2.61). We also observed associations between first primary lung ADC and second primary breast cancer in women (SIR=1.25, 95% CI=1.05-1.48) and prostate cancer (1.56, 1.39-1.79) in men.


CONCLUSIONS
The FPLC patients carried excess risks of smoking-related SPCs. An association between first primary lung ADC and second primary breast and ovarian cancer in women at younger age and prostate cancers in men may reflect an aetiological role of hormones in lung ADC.
Chuang
S-C
SC
International Agency for Research on Cancer, Lyon, France.
Scélo
G
G
Lee
Y-C A
YC
Friis
S
S
Pukkala
E
E
Brewster
D H
DH
Hemminki
K
K
Tracey
E
E
Weiderpass
E
E
Tamaro
S
S
Pompe-Kirn
V
V
Kliewer
E V
EV
Chia
K-S
KS
Tonita
J M
JM
Martos
C
C
Jonasson
J G
JG
Boffetta
P
P
Brennan
P
P
Hashibe
M
M
D000230:Adenocarcinoma / Q000453:epidemiology; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D008175:Lung Neoplasms / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D016609:Neoplasms, Second Primary / Q000453:epidemiology / Q000209:etiology*; D012307:Risk Factors; D055752:Small Cell Lung Carcinoma / Q000453:epidemiology