Assessing Breast Density's Value in Imaging - A Comparative Effectiveness Study

Aim 1 Clinical Outcomes

Inclusion criteria:

* Women aged 40-79 undergoing screening mammography from 2010-2017 for comparisons with tomosynthesis and 2005-2017 for comparison with breast MRI at a facility that participates in one of six BCSC breast imaging registries
* Digital mammography exams performed for screening and performed with or without supplemental screening with digital breast tomosynthesis from 2010-2017 or breast MRI from 2005-2017, at a facility that participates in one of seven BCSC breast imaging registries, and in women who meet inclusion criteria.

Exclusion criteria:

* Exams performed on women with a history of breast cancer, mastectomy, or breast augmentation.
* Unilateral mammograms and mammograms performed within 9 months of a prior mammogram to avoid classifying diagnostic exams as screening
* Exams without complete cancer capture during the follow-up period

Aim 1 Patient Reported Outcomes

Inclusion criteria:

* Women aged 40-74 years undergoing screening mammography, with or without supplemental screening with digital breast tomosynthesis or breast MRI, at selected BCSC facilities
* Women within 12 months of a digital screening mammogram with known breast density and no known breast cancer diagnosis
* For MRI subgroup, we will include women with a screening MRI within the prior 24 months
* Within strata defined by BCSC registry, breast density subgroup (dense vs. not dense), and race/ethnicity, women with supplemental screening with digital breast tomosynthesis or breast MRI will be matched to women without supplemental screening

Aim 1 Focus Groups

Inclusion criteria:

* Women age 40-74 years undergoing screening mammography, with or without supplemental screening (defined as digital breast tomosynthesis or breast MRI)
* Women within 12 months post-most recent screening examination with known dense breasts from most recent screening mammogram and no known breast cancer diagnosis
* Women who are able to speak English and can travel to a nearby location for a discussion

Subaim 1

Inclusion criteria:

* Radiologists interpreting digital mammography and/or tomosynthesis for at least one year from 2010-2017 at a facility that participates in the BCSC
* Digital mammography exams and digital breast tomosynthesis performed for screening and evaluated by a radiologist meeting inclusion criteria from 2010-2017

Exclusion criteria:

* Exams performed on women with a history of breast cancer, mastectomy, or breast augmentation
* Unilateral mammograms and mammograms performed within 9 months of a prior mammogram to avoid classifying diagnostic exams as screening
* Exams without complete cancer capture during one year following the screening mammogram

Aim 2 Clinical Outcomes

Inclusion criteria:

* Women at least 18 years of age with a first breast cancer diagnosis (DCIS or invasive) from 2005-2017 for whom there was a mammogram performed within the year prior to breast cancer diagnosis at one of the participating BCSC registry facilities
* Women for whom we have pathologically-confirmed breast cancer (DCIS or invasive) with a pathology or biopsy record related to the incident cancer diagnosis in the BCSC data
* MRI and mammography examinations performed for pre-operative work-up from 2005-2017 at one of the participating BCSC registry facilities in women meeting eligibility criteria

Aim 2 Patient Reported Outcomes

Inclusion criteria:

* Women at least 18 years of age with a first pathology-confirmed breast cancer diagnosis (DCIS or stage I-III invasive) within 6-18 months
* Known breast density at the time of breast cancer diagnosis

Aim 2 Focus Groups

Inclusion criteria:

* Women age ≥18 with a first breast cancer diagnosis (DCIS or stage I-III invasive cancer) within 1-5 years and after completion of active breast cancer treatment who have undergone mammography or MRI pre-operatively.
* Women who are able to speak English and can travel to a nearby location for a discussion

COVID-19 Enhancement Focus Groups

Inclusion criteria:

* Women age 18-74 who were due for breast imaging services during the COVID pandemic and have either canceled their appointment, delayed their appointment, or kept their appointment
* Women who are able to speak English and can attend calls virtually through Zoom or over the phone
* In addition, for focus groups with women who have prior breast cancer:

  1. First breast cancer diagnosis (DCIS or stage I-III invasive cancer) within 1-3 years prior to March, 2020.
  2. Completed active cancer treatment (ongoing endocrine and Herceptin therapy acceptable)
  3. No evidence of a second breast cancer event in cancer registry or pathology data before recruitment.