72F, p/w hgb 3.8. A little tired.
Some discoloration of fingers, she says it’s worse (and painful) when it’s cold.
No notable icterus.
Elevated indirect bili.
LDH elevated. Hapto undetectable.
Retic elevated.
+RBC clumping on smear. Other cells normal in morphology and number.
DAT: IgG+ (weak), C3+
Cold agglutinin titre: way >64
72F, p/w hgb 3.8. A little tired.
Some discoloration of fingers, she says it’s worse (and painful) when it’s cold.
No notable icterus.
Elevated indirect bili.
LDH elevated. Hapto undetectable.
Retic elevated.
+RBC clumping on smear. Other cells normal in morphology and number.
DAT: IgG+ (weak), C3+
Cold agglutinin titre: way >64
Berentsen, Frontiers in Immunology, 2020
Berentsen, Fattizzo, Barcellini, Frontiers in Immunology, 2023
Johannes Actuarius, Constantinople court physician, publishes De Urinis, which notes: "Yea indeed an extremely black urine… signifies extreme chilliness."
(syphilis causes paroxysmal cold hemoglobinuria, so used to be much more common)
(but watch out for a resurgence - syphilis cases went up 80%, to 207,000 in 2022)
Trypanosomiasis (N’gana, sleeping sickness) is found to cause deep anemias, partially via hemolysis.
Mssrs. Kanthack, Durham, and Blandford describe agglutination in red blood cells of animals infected with trypanosomes.
"Instead of forming rouleaux, the red corpuscles tend to clump into masses and to lose their outlines, especially when the anaemia is pronounced (rabbit, ass, and horse). The serum of such blood, when mixed with normal blood of the same species of animal, causes the red corpuscles to clump together also."
Karl Landsteiner publishes "About Relationships Between the Blood Serum and the Body Cells" (Über Beziehungen zwischen dem Blutserum und den Körperzellen), which contains a description of blood agglutination at cold temperatures (thermal amplitude 0-5C).
He’s the guy who discovered blood types, under the term "iso-agglutination," and won the Nobel Prize in Medicine for this in 1930.
Clough and Richter publish "A study of an autoagglutinin occurring in a human serum," first definite cases of cold agglutination in humans, describing the relationship between agglutination, hemolysis, and pneumonia.
McCombs and McElroy note that the huge increase in surgical transfusions since Landsteiner’s discovery has revealed a number of cases of cold agglutination found in the blood bank (thermal amplitude 0-25 C), confusing technicians nation-wide.
(And occasionally leading to death)
Lubinski and Goldbloom collect and describe 7 cases of cold agglutination with a thermal amplitude of 0-37C, all associated with hemolytic anemia (5 primary cases, 1 sepsis, 1 syphilis).
Christenson et al perform the first isolation of a monoclonal protein, a cold agglutinin. One of the pts also has a cryoglobulin.
Olesen publishes the first paper with a successful drug treatment for CAD, choosing chlorambucil based on the then-recent success of this drug in Waldenstrom macroglobulinemia. Follow-up in 1970 with 4 pts has similar results.
(One pt got cyclophosphamide for 4mo, switched to chlorambucil later on d/t drAE).
Rituximab comes to market.
Lee and Kueck try rituximab (375 x4) in a pt w CAD, and it works.
Berentsen et al report on a small prospective ritux study: 1 CR, 3 PR, 2 no response.
Berentsen et al retrospective study: ritux-based regimens RR 67-83%.
Berentsen et al, prospective study using BR: 71% RR, 40% CR, 31% PR. 50% RR in the retreatment setting. TTR 2mo. 77% response rate at 5y. Median DOR >88mo.
Rossi et al report on 2L bortezomib (GIMEMA) (single cycle): 32% RR, median DOR 16mo.
Case reports on CAS d/t pembro (Atiq 2020) and atezo (Acikgoz 2021).
Roth et al report (NEJM) on sutimlimab monotherapy (CARDINAL) (nonrandomized)
Roth et al report (Blood) on sutimlimab monotherapy (CADENZA) (phase III placebo-controlled RCT)
Berentsen, Fattizzo, Barcellini, Frontiers in Immunology 2023
Berentsen, Fattizzo, Barcellini, Frontiers in Immunology 2023