BACKGROUND: Information about @entity694 is scarce because of its extremely low incidence. OBJECTIVE: The aim of this study was to examine the prognostic significance of a histological diagnosis of @entity1962 in comparison with @entity694 . DESIGN: This study was retrospective in design. SETTING: California @entity5 Registry data from 1994 through 2004 with follow-up through 2008 were analyzed. @entity1 : @entity1 were included whose @entity694 and rectum, excluding the anus with a @entity5 histology of @entity420 and @entity1962 , was surgically treated. MAIN OUTCOME MEASURES: The primary outcomes measured were histology-specific survival analyses (with the use of the Kaplan-Meier method), and overall and colorectal-specific mortality (with the use of multivariable Cox proportional hazards regression analyses). RESULTS: A total of 111,263 @entity420 and @entity1962 of @entity694 cases were identified ( @entity420 , 99.91%; @entity1962 , 0.09%). There was no significant difference in sex, age, race, and socioeconomic status between the 2 groups. The most common location of @entity420 and @entity1962 was the right and transverse colon. The @entity1962 group was significantly associated with a higher rate of @entity3 at the time of operation ( @entity1962 , 36.56% vs @entity420 , 13.92%) and with poorly differentiated @entity5 grade ( @entity1962 , 65.96% vs @entity420 , 19.74%) in comparison with the @entity420 group. The median overall survival time was significantly greater in the @entity420 group (82.4 months) in comparison with the @entity1962 group (35.3 months). With the use of multivariable hazard regression analyses, @entity1962 histology was independently associated with increased overall mortality (hazard ratio, 1.67) and colorectal-specific mortality (hazard ratio, 1.69) in comparison with @entity420 . CONCLUSIONS: This is one of the largest studies of @entity694 to date. This uncommon @entity14 subtype was associated with higher overall and colorectal-specific mortality in comparison with @entity420 . Among @entity14 cases, @entity1962 histology should be considered a poor prognostic feature.

Population-based evaluation of XXXX .

@entity1 :: ('9606', 'Species') :: ['Patients', 'PATIENTS'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'Cancer'] @entity3 :: ('MESH:D009362', 'Disease') :: ['metastasis'] @entity14 :: ('MESH:D015179', 'Disease') :: ['colorectal cancer'] @entity1962 :: ('MESH:D018196', 'Disease') :: ['adenosquamous carcinoma'] @entity694 :: ('MESH:D003110', 'Disease') :: ['colon and rectal cancer', 'adenosquamous carcinoma of the colon and rectum', 'cancer of the colon', 'adenocarcinoma of the colon and rectum'] @entity420 :: ('MESH:D000230', 'Disease') :: ['adenocarcinoma']
@entity694 :: (MESH:D003110,Disease) :: ['adenosquamous carcinoma of the colon and rectum']
