Paraneoplastic Autoimmune Hemolytic Anemia in Ovarian Cancer: A Marker of Disease Activity

Abstract

Autoimmune hemolytic anemia (AIHA) is a rare paraneoplastic syndrome associated with ovarian malignancies. We report a case of a 77 year-old female with metastatic ovarian carcinoma who presented with worsening anemia from her baseline, and was found to have a warm autoimmune hemolytic anemia. We performed a literature review and analyzed all 10 cases (including our patient) that have been reported to date, and incorporated the clinical presentation, histology and stage of underlying malignancies, types, treatment, prognosis and mechanisms of AIHA in ovarian carcinoma.

Keywords

autoimmune hemolytic anemia ovarian cancer paraneoplastic syndrome

Introduction

Paraneoplastic syndrome is a syndrome with constellations of symptoms and signs that are not directly caused by primary or metastatic tumor. Some of these may be attributed to secretion of functional peptides and hormones by cancer cells or immune cross-reactivity between tumor and normal host tissues.¹ Given its rarity, it is difficult to determine the prevalence, but one study estimated the prevalence of paraneoplastic syndrome up to 8% in cancer patients.¹

Paraneoplastic autoimmune hemolytic anemia (AIHA) is a well-known phenomenon in patients with hematological malignancies, but it is much rare in solid tumors.² In an analysis of solid tumor cases with paraneoplastic AIHA, majority were secondary to lung, colorectal, renal and Kaposi's sarcoma.² On the other hand, paraneoplastic AIHA associated with ovarian malignancy is extremely rare. Herein, we present a case of paraneoplastic autoimmune hemolytic anemia in a patient with ovarian cancer with a literature review of this condition.

Case Report

A 77-year-old female presented to the hospital with worsening of her baseline anemia. Her oncologic history was significant for stage IV ovarian carcinoma, with papillary adenocarcinoma histology. Other significant medical history included ulcerative colitis, which was in remission since past few years. At the time of her ovarian cancer diagnosis, she had a normocytic normochromic anemia with hemoglobin of 11.0 g/dL. In the subsequent months, she underwent chemotherapy with 2 cycles carboplatin/paclitaxel and 4 cycles of carboplatin /docetaxel. Her chemotherapy was intermittently disrupted secondary to worsening pancytopenia, which was a result of cytotoxic effect of chemotherapy resulting in bone marrow suppression.

Subsequently, patient was admitted to the hospital for worsening fatigue, 3 months after her last chemotherapy treatment. She denied any bleeding, dizziness, dyspnea and chest pain. Her physical examination only showed mild conjunctival pallor. Her laboratory investigations revealed hemoglobin of 7.6 g/dL, which was lower than her baseline, MCV of 110 fL and RDW of 34 fL. B12, folic acid and TSH levels were normal. Further tests showed LDH of 338 IU/L, total bilirubin of 2.4 mg/dL with indirect bilirubin 1.9 mg/dL, haptoglobin of 0 mg/dL, reticulocyte of 7.9%, positive direct Coombe's test and a peripheral smear showing spherocytes and reticulocytes, all suggesting warm autoimmune hemolytic anemia. Her CA-125 during this hospitalization was increased to 359 units/mL compared to 15 a month prior to admission, indicating progression of her underlying ovarian malignancy. Computed tomogrphy scan also confirmed the progression of the disease and showed worsening of hepatic and adrenal metastases. She was treated with oral corticosteroids with minimal improvement, and chemotherapy with doxorubicin was started. One month after, her Hb, reticulocyte count, bilirubin and haptoglobin appear to have improved, correspond to decreased in CA-125 (Figures 1 and 2).

Figure 1.

Graph showing hemoglobin (Hb), reticulocyte, total and indirect bilirubin of the patient 8 months prior to admission until 1 month after admission.

Figure 2.

Graph showing haptoglobin, MCV and CA-125 of the patient 8 months prior to admission until 1 month after admission.

Discussion

Paraneoplastic syndromes that have been described associated with ovarian malignancies classified by system included neurological (polyneuropathy, cerebellar generation), connective tissue (dermatomyosistis, polyarteritis nodosa, rheumatoid arthritis, systemic lupus erythematosis, reflex sympathetic dystrophy, palmar fasciitis, digital ischemia), hematological [disseminated intravascular coagulation (DIC), acquired hemolytic anemia, microangiopathic hemolytic anemia, polycythaemia, thrombosis/thrombophlebitis], dermatologic (acanthosis nigricans, leser trelat syndrome, digital ischemia), endocrine (Zollinger-Ellison syndrome, Cushing's syndrome, nephrotic syndrome, hypercalcemia, hypertension, hypoglycemia).^3,4

We hypothesized that our patient's initial presentation of AIHA was a paraneoplastic phenomenon associated to her underlying ovarian malignancy. Other possible etiologies include drug-induced hemolytic anemia, particularly associated with carboplatin. So far four cases have been reported in the literature.⁵ However, hemolytic anemia occurred during or shortly after carboplatin administration in all cases.⁵ Our patient received her last chemotherapy three months prior to her presentation therefore making drug-induced hemolytic anemia unlikely. Similarly AIHA can occur in patients with ulcerative colitis, but it occurs typically in the setting of active colitis. The case in discussion has been in remission from ulcerative colitis since over a decade.⁶

Paraneoplastic autoimmune hemolytic anemia was initially reported in a benign dermoid cyst of the ovary in 1938, following that the association was described in a patient with pseudomucinous cystadenocarcinoma in 1945.^7,8 Subsequently 9 other cases have been reported on the literature to date (Table 1).^8–17

Table 1.

Association between ovarian malignancies and autoimmune hemolytic anemia.

Ref.	Age	Hb (g/dL)	Histology	Metastases	Type of AIHA	Treatment	Timing of anemia	Correlation with disease activity	Cause of death	Survival from cancer diagnosis
9	35	5	Pseudomucinous cystadenocarcinom	No	Negative	Tumor control	1 month prior to cancer diagnosis	–	–	–
10	28	6.7	Papillary cystadenocarcinoma	Yes	–	Steroids	4 months after radiation/7 months after surgery/8 months after chemotherapy	–	Deconditioned, uremia	13 months
11	36	4.8	Anaplastic carcinoma	Yes	Direct/indirect	Steroids	2 months after cancer diagnosis/radiation/surgery	Positive	Septic shock	6 months
12	54	8	Papillary cystadenocarcinoma	–	Negative	–	3 months after cancer diagnosis/2 months after radiation	–	–	–
13	64	4.8	Epitheliosarcomatoid tumour	No	Direct	–	–	–	–	–
14	57	6.6	Papillary cystadenocarcinoma	Yes	Direct/indirect	Tumor control	On diagnosis	Positive	Bilateral pleural effusion/ascites/marrow suppression	15 months
15	29	7.3	Anaplastic carcinoma	Yes	Direct	Tumor control	1 month prior to cancer diagnosis	Positive	–	–
16	56	7.4	Papillary cystadenocarcinoma	Yes	Direct/indirect Coombe's	Steroids temporary	28 months after cancer diagnosis /surgery	Positive	Cerebral infarction	35 months
17	75	6.8	Papillary cystadenocarcinoma	Yes	Direct	Steroids/tumor control	Post-chemotherapy	Positive	–	–
This case	77	7.6	Papillary cystadenocarcinoma	Yes	Direct	Steroids/tumor control	Post-chemotherapy	Positive	–	–

Hb, hemoglobin; AIHA, autoimmune hemolytic anemia.

Presentation of Autoimmune Hemolytic Anemia

In all cases reported including our case, AIHA in the setting of ovarian malignancies appears to be a disease of adult. The age of presentation ranged from 28-77, with a mean age of 51, and our patient is the oldest patient described. Anemia is usually the reason for presentation, and the hemoglobin values can range from 4.8-8.0 mg/dL. AIHA may antedate, postdate or occur concurrently at the time of ovarian malignancies diagnosis. It can also present 2-28 months after definitive treatment. The case in current discussion, presented with AIHA, during the chemotherapy treatments and was the first sign of tumor progression - confirmed by both tumor marker (CA-125) and radiologic finding.

Histology Type and Stage of the Underlying Ovarian Malignancies

The histology classification of ovarian tumors by the World Health Organization (WHO) is based on the histogenesis of the normal ovary, which can be derived by the surface epithelium, germ cells and mesenchyme.¹⁴ Of these, papillary cystadenocarcinoma, which is originated from surface epithelium of ovary, is most commonly associated with AIHA, sixty percent of all reported case.^{9,11,13,15,16} Two cases of anaplastic carcinoma have also been reported to be associated with AIHA.^10,14 All cases except three were found to have metastatic disease either on presentation or later during their course of disease.^9,10,13–16

Types of Autoimmune Hemolytic Anemia

AIHA is an immune-mediated disease caused by presence autoantibodies attacking one's own red blood cells. It can be classified into primary (idiopathic) or secondary to underlying illness. There are usually two types; warm and cold hemolytic anemia.¹⁸ They can be differentiated using direct and indirect Coombe's. In AIHA associated with ovarian malignancies, direct Coombe's is more frequently found to be positive (7/10 cases). Three of these cases were positive for both direct and indirect Coombe's test.^10,13,15 Coombe's test was negative in two cases, a hemolytic serum factor was found in one of these.^8,11 The types of antibody vary and included anti-Kell, anti-E, anti-I cold agglutinin, IgG and IgA, with no consistent patterns found. Our patent was found to have warm IgG hemolytic anemia. The temporal relationship between paraneoplastic syndrome and cancers are unclear, however there appeared to be correlation seen between the presence of antibodies and underlying disease activity, as in our patient.

Treatment

First line therapy for AIHA is typically corticosteroids. However, the treatment of AIHA in the setting of malignancies are not well established. Although some patients responded to steroids, majority underwent definitive treatment for the underlying malignancies with improvement of hemoglobin.^8,13,14,16 Tumor control seems be more effective than the conventional treatment for AIHA. The case in current discussion, responded only modestly to steroids, and responded significantly to treatment of underlying disease, which is treatment of ovarian carcinoma by chemotherapy.

Prognosis

Most patients were in stage IV disease on diagnosis; therefore it is not surprising that their prognosis were poor. Of the 10 cases, 4 patients passed away 6-35 months after their cancer diagnosis.^12,13,16,18 Causes of death include deconditioning, uremia, septic shock, cerebral infarction, marrow suppression and complications from chemotherapy.

Mechanism

The mechanisms underlying malignancy associated AIHA are not well understood, and pathogenesis may be different. Studies have suggested that changes in the protein and phospholipid fractions of the RBC membranes in patients with ovarian cancer lead to increases susceptibility to hemolysis.¹⁹ It was postulated that CA-125, a glycoprotein measured in ovarian cancer, might have an immunosuppressive effect and inhibit hemolysis, which may explain AIHA after cancer treatment.²⁰ Specially, a study demonstrated that hemolytic serum factor from tumor was found after irradiation.¹¹ In cases where AIHA predate treatment, it may be secondary to antibodies produced as a result of tumor antigen cross-react with normal red blood cells.²¹

Conclusions

In summary, we highlight the rarity of paraneoplastic AIHA in metastatic ovarian malignancies. Our patient is the oldest described case, and like majority of the cases, her ovarian carcinoma was of papillary cystadenocarcinoma histology. Anemia in patients with ovarian carcinoma may be multifactorial, from bleeding, bone marrow suppression from chemotherapy, or nutritional deficient, but as highlighted by this case AIHA should be considered if the clinical picture suggests hemolysis. Also, new onset of AIHA, may also be related to cancer activity, such as in this case. Early identification may or may not improve mortality, but could potentially improve quality of life.

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