Tamoxifen for ER Positive Breast Cancer: 70 Real Stories

Primary neuroendocrine breast tumor: disease-free 5 years after mastectomy and tamoxifen

Patient Info: Anonymized, Female, 50s

Biomarkers: Neuroendocrine breast tumor: ER/PR positive, HER2 negative

As of April 2025, she had remained disease-free for 5 years after mastectomy, negative sentinel lymph node biopsy, and tamoxifen 20 mg once daily.

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Stage I HR-Positive Invasive Lobular Carcinoma: Mandy's Patient Story

Patient Info: Mandy, Female, 40s | Stage I

Biomarkers: ER-positive; PR-positive; low Oncotype score; genetic testing negative for 70 cancer-causing genes

As of April 2025, Mandy was about 10 months after bilateral mastectomy for Stage IA ER-positive, PR-positive ILC, had a low Oncotype score, was planning several years of tamoxifen, and was still in reconstruction.

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Breast cancer linked to a rare kidney condition believed to be cancer-related

Patient Info: Anonymized, Female, 50s

Biomarkers: ER-positive; PR-positive; HER2 score 1+; Ki-67 5-10%

At the latest follow-up, she had no local or distant breast-cancer recurrence and maintained excellent performance status.

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Metastatic Breast Cancer Returning About 20 Years After Initial Treatment

Patient Info: Anonymized, Female | Stage IV

Biomarkers: ER-positive, PR-negative, HER2-positive

Metastatic Site: bones

About 20 years after her original breast-cancer treatment and sustained remission, bone biopsy confirmed metastatic recurrence; she became too unwell for planned cancer therapy and chose supportive care.

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Stage 4 HR-positive breast cancer: stable disease on ribociclib

Patient Info: Anonymized, Female, 40s | Stage IV

Biomarkers: ER-positive; PR-positive; HER2-negative

Metastatic Site: left iliac bone

Metastatic HR-positive, HER2-negative breast cancer remained without progression as of October 2024 while she continued ribociclib 400 mg plus letrozole after SBRT to a left iliac bone metastasis.

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Stage IV luminal B breast cancer with liver, bone, and bone marrow metastases

Patient Info: Anonymized, Female, Under 40 | Stage IV

Biomarkers: ER 90% positive; PR 20% positive; HER2-negative; Ki-67 60%; luminal B

Metastatic Site: liver, bone, bone marrow

The patient had marked clinical and hematologic improvement on leuprorelin, letrozole, ribociclib, and zoledronic acid, with sustained complete remission reported for 4 months from September to December 2023 and monthly follow-up advised.

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HR-Positive Breast Cancer: Anna's Survivor Story

Patient Info: Anna, Female, Under 40

Biomarkers: ER-positive; PR-positive; HER2-positive

As of October 2024, Anna was about 7 years from diagnosis and described long-term survivorship after surgery, chemotherapy, radiation, biologic treatment, and tamoxifen-related mental-health effects.

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Stage 4 breast cancer: ongoing treatment with multi-line chemotherapy

Patient Info: Anonymized, Female, 40s | Stage IV

Biomarkers: Initial tumor: hormone receptor-negative; HER2 2+. 2011 recurrence: ER 10%; PR 70%; HER2 2+.

Metastatic Site: pleura/pleural effusion; lung

Metastatic breast cancer with malignant pleural effusion achieved complete response after chemotherapy and long-term endocrine therapy; PET-CT in October 2023 still showed complete response, with ongoing cardiac and bone-health management.

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Finding A Lump To BREAST CANCER!

Patient Info: Kelsey Harrison, Female, Under 40 | Stage II

Biomarkers: ER-positive

As of July 2024, Kelsey had completed chemotherapy, double mastectomy with axillary lymph-node removal, and radiation, and was continuing tamoxifen plus Lupron ovarian suppression with additional planned systemic therapy.

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ER/PR-positive invasive mucinous breast cancer: mastectomy, DIEP reconstruction, and tamoxifen

Patient Info: Anonymized, trans woman, 50s

Biomarkers: ER 100% positive; PR 100% positive; HER2-negative; 19-gene hereditary cancer panel negative

As of May 2024, she was 1 year after bilateral DIEP free-flap reconstruction, satisfied with the cosmetic result, taking tamoxifen for recurrence-risk reduction, and planning nipple reconstruction; no recurrence status beyond the postoperative course was stated.

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Invasive lobular breast cancer with isolated scalp metastasis: excision and endocrine therapy

Patient Info: Anonymized, Female, 50s | Stage IV

Biomarkers: Original breast tumor: ER-positive; PR-positive; scalp metastasis: CK7-positive; ER-positive; GCDFP-15 partially positive

Metastatic Site: scalp/skin

As of April 2024, she had no signs of recurrence in the breast or scalp and no distant metastasis after excision of the isolated scalp metastasis while continuing anastrozole.

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Metastatic Breast Cancer With Recurrent Severe Hypocalcemia During Treatment - Case 1

Patient Info: Anonymized, female, Under 40 | Stage IV

Biomarkers: ER-positive; PR-positive; HER2-negative

Metastatic Site: bone, liver, ovaries

She died about 9 years after her breast-cancer diagnosis after progression of liver metastases.

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Stage II HR-Positive Invasive Ductal Carcinoma: Allison's Patient Story

Patient Info: Allison Tierney, Female | Stage II

Biomarkers: ER-positive; PR-positive; HER2-positive; CHEK2 mutation; BRCA1/2 negative

As of March 2024, Allison had completed Taxol and Herceptin treatment, was on tamoxifen planned for 10 years, and had moved to 6-month oncology follow-up. No metastatic disease or recurrence was reported.

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HER2-positive Stage IIB breast cancer complicated by acute neuro-Behcet disease during neoadjuvant treatment

Patient Info: Anonymized, Female, 40s | Stage II

Biomarkers: ER-positive; PgR/PR-positive; HER2-positive by FISH amplification; Ki-67 index 50%

As of June 2024, there was no recurrence of breast cancer or neuro-Behcet disease 2 years after surgery and postoperative HER2-directed plus endocrine therapy.

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BRCA2-Positive Breast Cancer in a Woman With Down Syndrome

Patient Info: Anonymized, female, Under 40 | Stage IV

Biomarkers: ER-positive, PR-negative, HER2-negative, germline BRCA2 pathogenic variant

Metastatic Site: lungs, bones

The cancer later progressed with lung and bone metastases and extensive cancer spread through lymphatic vessels in both lungs. She died 59 months after breast surgery.

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Breast Cancer Recurs After a 19-Year Remission and Responds to Later Chemotherapy

Patient Info: Anonymized, female, 50s | Stage IV

Biomarkers: Initial tumor: PR-positive, ER-negative, HER2-negative. Recurrence: ER-positive, PR-negative

Metastatic Site: bones

The cancer recurred after a 19-year remission and later spread to bone. More than 21 years after the original diagnosis, she had marked tumor shrinkage, was in good general condition, and had 10 months of progression-free survival after utidelone plus capecitabine.

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Male Breast Cancer Controlled for Years Through Multiple Lines of Targeted and Endocrine Therapy

Patient Info: Anonymized, male, 70+ | Stage IV

Biomarkers: Initial tumor ER-positive, PR-positive, HER2-positive; later ER-positive, PR-negative, HER2-negative; PIK3CA mutation; germline BRCA1/2 negative

Metastatic Site: bones, pleura, liver

After a 5-year and 6-month disease-free interval, the cancer recurred in bone and later progressed to the pleura and liver. He died in January 2021, more than 13 years after his 2007 breast-cancer diagnosis.

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Breast tumor with extensive tissue death (infarction)

Patient Info: Anonymized, Female

Biomarkers: Oestrogen receptor-positive; HER2 equivocal; confirmatory HER2 FISH was not performed

After 1.5 years of endocrine therapy, there was no clinical evidence of residual tumour.

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Occult Metastatic Breast Cancer First Appears as a Sternal Mass

Patient Info: Anonymized, female, 60s | Stage IV

Biomarkers: ER-positive, PR-positive, HER2-negative; BRCA1/2 testing negative

Metastatic Site: sternum

More than 3 years after the sternal mass was first detected, imaging showed no active breast or chest-wall disease and the cancers were described as appearing in remission while she continued tamoxifen.

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Stage II HR-Positive Invasive Lobular Carcinoma: Megan's Survivor Story

Patient Info: Megan Claire Chase, Female | Stage II

Biomarkers: ER-positive; PR-positive; HER2 not reported

As of July 2023, Megan-Claire was in survivorship after Stage II invasive lobular breast cancer, with clear early scans but significant long-term effects, surgical menopause, chronic pain, fatigue, chemo brain, and inability to tolerate recurrence-prevention medications.

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Stage IV HR-Positive Breast Cancer: Bethany's Patient Story

Patient Info: Bethany, Female, Under 40 | Stage IV

Biomarkers: ER-positive / hormone-positive

Metastatic Site: Liver; bones; lymph nodes; stomach

As of December 2022, Bethany was living with Stage IV metastatic breast cancer after recurrence to the liver, bones, lymph nodes, and stomach, and was on lifelong maintenance treatment after disease shrinkage.

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Male breast cancer discovered after years of stiff-person syndrome

Patient Info: Anonymized, Male, 50s

Biomarkers: ER-positive; PR-positive; HER2-negative; anti-amphiphysin antibody positive at 1:64; hereditary cancer panel negative for pathogenic germline variants.

He completed curative-intent breast cancer treatment and reported substantial improvement in upper-body stiffness, although lower-extremity stiffness, cramps, and unsteadiness persisted.

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Breast cancer recurrence in the mandibular condyle causing jaw pain

Patient Info: Anonymized, Female, 50s | Stage IV

Biomarkers: ER-positive; PR-positive; HER2-negative.

Metastatic Site: right mandibular condyle with extension into the…

After anastrozole and 60 Gy of radiation, her jaw pain, mouth opening, and function improved, although some discomfort remained and palliative systemic treatment was continuing.

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Locally advanced male breast cancer associated with a pathogenic ATM variant

Patient Info: Anonymized, Male, 50s | Stage Metastatic/Advanced

Biomarkers: ER 100% positive; PR 100% positive; HER2-negative; Ki-67 30%; germline pathogenic ATM variant c.2921+1G>A.

Two years after diagnosis, he had an ECOG performance status of 0 and remained without signs of breast-cancer relapse or another primary cancer.

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