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Table 1 Baseline characteristics of the adult and elderly MPM patients

From: Clinical-pathological characteristics and prognostic factors for malignant peritoneal mesothelioma in the elderly

Variable  < 65 years olda
N = 827 (55.43%)
 ≥ 65 years olda
N = 665 (44.57%)
P value
Gender    0.017
Male 274 (41.20%) 391 (58.80%)  
Female 274 (41.20%) 274 (41.20%)  
Race    0.043
White 737 (89.12%) 616 (92.63%)  
Black 47 (5.68%) 24 (3.61%)  
Asian or Pacific Islander 31 (3.75%) 23 (3.46%)  
American Indian/Alaska Native 7 (0.85%) 2 (0.30%)  
Unknown 5 (0.60%) 0  
Insurance status     < 0.001
Insured 316 (38.21%) 239 (35.94%)  
Uninsured 27 (3.26%) 3 (0.45%)  
Unknown 484 (58.52%) 423 (63.61%)  
Marital status     < 0.001
Married 527 (60.78%) 398 (59.85%)  
Unmarried 256 (38.50%) 271 (31.26%)  
Unknown 69 (7.96%) 11 (1.65%)  
Site    0.006
Peritoneum 807 (97.58%) 630 (94.74%)  
Retroperitoneum 16 (1.93%) 32 (4.81%)  
Ovarlapping lesion of retroperitoneum and peritoneum 4 (0.48%) 3 (0.45%)  
Histology    0.403
Epithelioid 270 (32.65%) 195 (29.32%)  
Biphasic 30 (3.63%) 19 (2.86%)  
Sarcomatoid 21 (2.54%) 19 (2.86%)  
Unknown 506 (61.19%) 432 (64.96%)  
Grade    0.003
Well differentiated 84 (10.16%) 33 (4.96%)  
Moderately differentiated 17 (2.06%) 11 (1.65%)  
Poorly differentiated 47 (5.68%) 48 (7.22%)  
Undifferentiated 18 (2.18%) 11 (1.65%)  
Unknown 661 (79.93%) 562 (84.51%)  
Stage    0.751
Localized 86 (10.40%) 68 (10.23%)  
Regional 128 (15.48) 95 (14.29%)  
Distant 493 (59.61%) 414 (62.26%)  
Unknown 120 (14.51%) 88 (13.23%)  
Surgery     < 0.001
Cancer-directed surgery 396 (47.88%) 220 (33.38%)  
No cancer-directed surgery 407 (49.21%) 430 (64.66%)  
Unknown 24 (2.90%) 13 (1.95%)  
Radiotherapy    0.100
Yes 31 (3.75%) 15 (2.26%)  
No or unknown 796 (96.25%) 650 (97.74%)  
Chemotherapy     < 0.001
Yes 494 (59.7%) 294 (44.21%)  
No or unknown 333 (40.3%) 371 (55.79%)  
  1. Significant P values shown in bold
  2. MPM, malignant peritoneal mesothelioma
  3. arefers to the age recorded at the time of MPM diagnosis