breast cancer came back, it is a different one / right breast was so painful/she had pain; she started to have fluid in her lungs; losing weight every day; she has cancer in her lungs; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) for a sponsored program (002191). The reporter is the patient.  A female patient received bnt162b2 (BNT162B2) (Batch/Lot number: unknown) as dose 2, single for covid-19 immunisation. Relevant medical history included: "breast cancer" (unspecified if ongoing). The patient's concomitant medications were not reported. Vaccination history included: Covid-19 vaccine (Dose 1, MANUFACTURER UNKNOWN), for Covid-19 immunization. The following information was reported: BREAST CANCER (medically significant), outcome "unknown", described as "breast cancer came back, it is a different one / right breast was so painful/she had pain"; PULMONARY OEDEMA (medically significant), outcome "unknown", described as "she started to have fluid in her lungs"; LUNG NEOPLASM MALIGNANT (medically significant) with onset Dec2021, outcome "unknown", described as "she has cancer in her lungs"; WEIGHT DECREASED (medically significant), outcome "unknown", described as "losing weight every day". The events "breast cancer came back, it is a different one / right breast was so painful/she had pain", "she started to have fluid in her lungs", "she has cancer in her lungs" and "losing weight every day" were evaluated at the physician office visit. The patient underwent the following laboratory tests and procedures: biopsy: unknown results; magnetic resonance imaging: didn't see anything in her breast; weight: losing, notes: She also had been losing weight every day. Therapeutic measures were taken as a result of breast cancer, pulmonary oedema and lung cancer. Clinical course: Patient is a caregiver and she got the Pfizer COVID vaccine and after her last one, the 2nd dose, she told her doctor that she had pain and she didn't blame it on the vaccine. Her right breast was so painful. She had breast cancer before. She went to her doctor, the oncologist, who sent her for an MRI and he didn't see anything in her breast but then suddenly she started to have fluid in her lungs. They started checking everything and then found out in Dec2021 that she has cancer in her lungs. She was put on palbociclib (IBRANCE). The doctor said this cancer is very rare, usually it is on other places. Her breast cancer came back, it is a different one, and they cannot see it on an MRI at all, they can only see it on her lungs. They did a biopsy and did a catheter. It came back after months. She also had been losing weight every day. She stopped working because of the catheter and her sickness. They kept denying her medication and she was on the phone and had no rest. She has a catheter on her lungs on the right side now. She did not blame what happened on the COVID vaccine, she was just saying the situation that started on that day and then she saw her oncologist. She was in remission for 8 years. Her first oncology doctor checked her blood every 6 months and this one doesn't do that.   The lot number for bnt162b2 was not provided and will be requested during follow up.