The SEER Program strives to make all L/R/D stage variables consistent for all cancer sites for the appropriate years.  However, there are certain site/year combinations where this is not possible.  The following table details changes imposed on the stage variables by the SEER Program.

Site SEER Historic Stage A SEER Summary Stage 1977 (1988+) SEER Summary Stage 2000 (1998+)
Peritoneum, Omentum and Mesentary 1973-1987 all cases are blank    
Nose, Nasal Cavity and Middle Ear 1973-1982 all cases are blank    
Lung and Bronchus 1973-1982 all cases are blank    
Prostate 1973-1982 all cases are blank
1983-2003 all localized and regional cases coded as “Localized/regional (Prostate cases)”		 1988-1994 all cases are blank  
Bladder 1973-2003 all cases originally staged as in situ are converted to localized 1988-2003 all cases originally staged as in situ are converted to localized  
Brain and Other Nervous System 1973-2003 all cases are unstaged    
NHL 1973-1982 all cases are blank
1983-2003 all cases are unstaged		    
Hodgkins Lymphoma 1973-2003 all cases are unstaged    

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