Lung Cancer - pathology Flashcards
95% of lung tumors are _______ (which type).
carcinoma (CA of epithelial cells)
Which type of lung cancer kills more people than colon, breast and prostate combined?
lung
how do you calculate risk of lung CA for cigarrette smokers?
2 pack/day for 20 yrs = 60 x risk than non-smokers
4 environmental risk factors for lung CA
other than smoking
- asbestos
- uraniam (radiation)
- arsenic, chromium, nickle
- vinyl chloride (plastics)
possibly air pollution &. mustard gas (WWI vets) & indoor air pollution
Lung CA classifications
in order of prevalence
- adenocarcinoma (50%)
- Squamous cell (20%)
- Small cell (15%)
- Large cell (2%)
large cell are undifferentiated
tumors may be a mixture of these
Which 2 types of lung cancer are centrally located?
- Small cell
- Squamous
Sentrally located
Loss of TP53 & CDKN2A or amplification of FGFR1 will lead to which type of lung cancer?
squamous cell
Adenocarcinoma is formed due to a gain-of-fxn mutation of EGFR, ALK & which 2 others?
these lead to un-checked growth factor production
- MET
- RET
Lung CA in Never Smokers almost never have _____ mutations & less ______ mutations.
- KRAS
- TP53
4 MC metastases of Lung CA
outside of the chest cavity
- adrenals (50%)
- liver
- brain
- bone
lymphatic and hemogenous spread
dysplastic
abnormal cell (increased cytosol, nuclear enlargement, hyperchromasia)
dysplastic
abnormal cell (increased cytosol,
Lung carcinomas commonly metastasize to which 4 organs/tissues?
within the chest cavity
- pleura
- pericadium
- mediastinum
- lymph nodes (50%)
atypical adenomatous hyperplasia
small lesions (<5mm) w/dysplastic celll lining alveolar walls
may lead to adenocarcinoma in situ
define adenocarcinoma in situ
1-5% of lung adenocarcinomas
small solitary lesion <3 mm
neoplastic cells grow along preexisting alveolar walls (NO INVASION…(in situ = “in place”; it stays in place))
(excision = 100% survival rate)
2 MC types of adenocarcinoma in situ?
(in situ = “in place”; it stays in place)
- nonmucinous
- mucinous
non-mucinous adenocarcinoma in situ
mucinous adenocarcinoma in situ
Which lung cancer is associated with fetoprotein thyroid transciption factor-1?
adenocarcinoma
Which lung cancer is invasie/malignant epithelial tumor w/glandular differentiation and/or mucin production?
adenocarcinoma
what are the 4 patterns of adenocarcinoma?
- acinar
- lepidic
- papillary
- solid w/mucin
why are mucinous adenocarcinomas difficult to excise?
spread aerogenously –> satellite tumors
(multiple nodules or entire lobe)
well-differentiated adenocarcinoma
obvious gland formation
(pink within gland=mucin, inset is a postive stain for TTF-1)