Table 1 Summary of the 7774 Mayo Clinic cancer pathology reports dataset

Data Element	% Non-missing	No. of Patients		Age in Years Mean [Min-Max]	Type of Cancer (%)
Data Element	% Non-missing	M	F	Age in Years Mean [Min-Max]	Breast	Lung	Pancreas	Skin	Digestive Organs	Female Reproductive Organs	Male Reproductive Organs	Other
Protocol Biopsy	25	1145	772	53.7 [19–85]	1	0	0	18	1	0	2	76
Procedure	70	2736	2682	60.6 [19–97]	13	6	3	2	13	8	16	38
Specimen	30	1096	1216	63.3 [21–97]	0	14	7	1	29	19	1	29
Primary Tumor	59	2401	2224	61.6 [19–97]	15	7	4	2	15	9	19	29
Specimen Integrity	17	530	801	63.3 [19–95]	0	23	0	5	4	30	3	34
Surgical Margins	44	1514	1898	62.1 [19–97]	20	10	5	3	20	7	2	33
Laterality	32	935	1545	58.0 [19–91]	29	13	0	1	1	0	1	54
Histologic Type	68	2674	2614	60.5 [19–97]	14	7	2	2	13	8	17	37
Histologic Grade	63	2525	2344	61.0 [19–97]	13	7	3	1	14	9	17	36
Mitotic Rate	13	209	793	59.3 [19–95]	59	1	4	7	3	0	0	26
Pathologic Staging Descriptors	30	1059	1295	60.9 [19–93]	25	6	5	2	14	8	15	25
Tumor Focality	27	873	1249	60.1 [19–92]	29	15	2	1	5	1	2	44
Tumor Site	43	1623	1698	60.5 [19–97]	7	10	5	3	19	8	1	47
Tumor Size	49	1584	2195	61.5 [19–97]	17	9	5	3	19	12	2	35
Lymphovascular Invasion	53	2226	1859	62.3 [19–97]	15	8	4	3	16	8	20	25
Regional Lymph Nodes	59	2376	2222	61.6 [19–97]	15	7	4	2	15	9	18	29
Lymph Node Sampling	30	917	1378	60.4 [19–93]	31	0	0	1	1	18	35	13
Number Examined	44	2270	1115	61.7 [19–97]	0	10	5	1	20	4	25	36
Number Involved	37	1957	924	62.1 [19–97]	0	10	6	1	22	3	26	32
Distant Metastasis	50	1940	1914	61.4 [19–97]	17	8	4	3	18	4	12	33
Perineural Invasion	16	764	462	63.1 [21–97]	0	2	13	4	47	0	1	32
Treatment Effect	29	1505	784	62.3 [19–95]	9	13	5	1	23	1	34	14

We show the top 22 most frequently reported data elements. The data elements listed do not occur in every report—the percent non-missing indicates the percentage of reports containing the corresponding data element.

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